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Bangladesh National Building Code 2015
BNBC 2015 FINAL DRAFTBANGLADESH NATIONAL
BUILDING CODE
Volume 1 of 3
(Part 1 to Part 5)
FINAL DRAFT
2015
Housing and Building Research Institute
Volume 1
PART 1 SCOPE AND DEFINITION
PART 2
PART 3 ADMINISTRATION AND ENFORCEMENT
PART 4 GENERAL BUILDING REQUIREMENTS, CONTROL AND
PART 5 REGULATION
FIRE PROTECTION
BUILDING MATERIALS
BNBC 2015 FINAL DRAFT
Volume 2
PART 6 STRUCTURAL DESIGN
Volume 3
PART 7 CONSTRUCTION PRACTICES AND SAFETY
PART 8
PART 9 BUILDING SERVICES
PART 10 ADDITION, ALTERATION TO AND CHANGE OF USE OF
EXISTING BUILDINGS
SIGNS AND OUT-DOOR DISPLAY
PREFACE TO BNBC 2015
In order to provide safe and healthy habitat, all activities BNBC 2015 FINAL DRAFT housing sector turned out to be a profitable business. As a
related to building construction such as planning, design result building construction activities were taken up by
and construction needs to be regulated properly. real-estate developers following which new trends
Technological and socio-economic developments in recent developed in building planning and construction. Some
times have led to remarkable increase in demand for more real-estate developers engaged professional people such
and more sophistication in buildings resulting in ever as Architects, Engineers, Planners to make their buildings
increasing complexity. Buildings are products of a multi- more attractive to the buyers and the code started finding
disciplinary profession involving specialized professional its use among the professionals. However, some owners
inputs from disciplines like Architecture, Fire prevention, and developers retained the habit of the old method of
Materials science, Structural engineering, Geotechnical construction giving rise to unplanned growth of structures
engineering Construction technology, Electrical in the urban areas. During this time some high rise
engineering, Mechanical engineering, Acoustics, Sanitation structures failed to perform satisfactorily due to structural
and plumbing technology, Chemical engineering, Law, etc. failure / fire hazard which caused alarm among the urban
It is therefore imperative that a uniform standard of dwellers as well as the policy makers. The policy makers,
practice covering all aspects of planning, design and therefore felt the urgency of updating the BNBC 1993 to
construction of buildings, including the service facilities make its contents time worthy and also to bring it under
provided in them such as electrical, mechanical, sanitary strict legal coverage to make its provisions binding to all
and other services, be followed to ensure safety, involved in the planning, design, construction and use.
minimization of wastage in construction and optimum The building construction sector was first brought into a
return for the user. In the Building code each of the above legal framework through enactment of Building
aspects is addressed adequately by professionals Construction Act 1952. By the power given by the Act, the
specializing in the relevant disciplines to ensure safety and Government of Bangladesh has promulgated regulations
comfort of the users of the buildings. which were amended from time to time. In 2006 the
In order to regulate the technical details of building Building Construction Act was amended to include a new
construction and to maintain the standard of construction Section 18A empowering the Government to promulgate
the Bangladesh National Building Code (BNBC) was first the Building Code as a legally binding document.
published in 1993. It was a 1000 page detailed document Since its publication, BNBC 1993 has been referred to and
specifying safe and acceptable practices in all aspects of consulted by the professionals and designers in the field of
building design and construction. However, since its building design and construction. After the endowment of
publication, significant changes and developments have legal status, importance of the BNBC 1993 has further
taken place in both building technology and material enhanced. However, unlike other building codes available
properties requiring the use of the present state of the art in the world, the Bangladesh National Building Code has
knowledge and practices in building planning, design and not yet been formally reviewed and updated since it was
construction. To keep pace with the changed drafted in 1993. Neither any feedback of the professionals
circumstances, it is a routine practice to update codes. regarding the document has been taken into formal
Twenty two years have nearly been elapsed since consideration. In the last twenty two years, new materials
publication of the first version of the Code. have been introduced, new scientific methods have
After introduction of the BNBC in 1993, the technology of emerged, new technologies have evolved and both design
building construction in Bangladesh remained almost the of structures and construction practices have gone through
same for quite some time as was in practice before its enormous changes. Researchers, engineers and academics
publication. The lack of legal provisions in enforcing its use in Bangladesh have also conducted new studies which
has been the main reason behind it. In the meantime enriched our knowledge about planning, design,
growing demand for home, scarcity of land and the upward construction and sustainability of buildings.
trend in the land prices in the urban areas brought in the Ministry of Housing and Public Works formed a steering
culture of construction of moderate to high rise structures committee with the responsibility of Updating BNBC 1993
and changed the prevailing culture of planning, design and by a G.O. having circular no. Section 8/IM-5/93(part) 812
construction of buildings in the private sector. Gradually, (28) date: 15.09.2008. The Steering Committee comprises
the urban dwellers began to accept the concept of living in representatives from relevant government agencies,
high rise apartment buildings and investment in the universities and professional societies. The Housing and
i
Building Research Institute (HBRI) has been entrusted with BNBC 2015 FINAL DRAFTbuildings. The updated BNBC contains chapters addressing
the task of providing secretarial service to the Steering the issues of energy conservation, rainwater harvesting
Committee and managing the implementation of the and distribution mechanisms in buildings.
project. According to an agreement between HBRI and In Part 3, “General Building Requirements, Control and
Bureau of Research Testing and Consultancy (BRTC), Regulation” a new Chapter titled, “Energy Efficiency and
Bangladesh University of Engineering and Technology Sustainability” has been included giving minimum code
(BUET), for the purpose of reviewing and updating the requirements for achieving the efficiency.
Bangladesh National Building Code 1993, BRTC, BUET To reduce energy consumption in building provisions for
deputed leading experts in all relevant fields among use of variable refrigeration system in HVAC applications,
academics and professionals. Finally the updated code is Variable Voltage, Variable frequency drives in elevator
available both in printed form and soft copy in CDs and on applications has been included in Chapter-2 “Air
website. Conditioning, Heating and Ventilation” of Part-8 “Building
The updated BNBC has 10 parts with a total of 49 chapters. Services”. Energy conservation in lighting using energy
Some parts contain a number of appendices wherein saving lamps, Fluorescent lamps and GLS lamps has also
sample calculations, design tables, graphs etc. are provided been proposed in Chapter-1, “Electrical and Electronics
for use by the readers for important analysis and designs. Engineering Services for Buildings” of the same part.
Part-6 Structural Design has 13 chapters which is the To augment water supply in Buildings, Chapter-8,
maximum among all the parts. “Rainwater Management” in Part-8 “Building Services” has
In the contents of the Updated Code, almost all of the been included in the Updated Code containing specific
topics of BNBC 1993 have been retained. Moreover some guidelines for harvesting, storage and distribution of
of these have been elaborated to accommodate the rainwater.
changes identified during review of the BNBC 1993 and the Contents of tlhe chapters already existing in BNBC 1993,
various codes and documents collected to make their have been thoroughly revised in the updated version. In
scope wider, up to date and user friendly. some cases new concepts have been included. For
Part-6 “Structural Design” in the Updated Code include two example, In Chapter-7 “Masonry structures” of Part 6, the
new chapters, one on Bamboo Structure and the other on concept of ‘Confined Masonry’ is introduced and guidelines
Steel-Concrete Composite Structures. The former is for design and detailing are provided.
intended for use in the rural areas. The use of well designed In general up to date information and standards are
and economic bamboo structures is expected to be included in the updated Code in a way which is practicable
attractive to the rural people. The Steel Concrete by designers and professionals involved in building
composite structures are expected to be widely used in the construction. I acknowledge adoption of provisions of
industries. In urban areas this type of structure is expected various recognized codes and standards in the present
to find application in high rise construction. code after a thorough review. Part 2, a practical approach
Contrary to the presentation of Geotechnical engineering is delineated in administering and enforcement of the
in BNBC 1993 wherein it has been treated as “Foundation” Code; which I believe will pave the way in actually
having limited scope, in the Updated code the chapter on implementing the Code provisions and ensure safer
geotechnical engineering has been re-named as “Soils and building construction in Bangladesh.
Foundations.” The scope of the proposed “Soils and I gratefully acknowledge contribution of members of the
Foundations” chapter has been made wider by including Steering Committee and the Editorial Committees for their
topics such as ground improvement, geo-textiles, soil active participation and guidance in updating the building
reinforcement, slope stability, foundation on problematic code. The process of updating has undergone a rigorous
soils and sanitary landfills, dewatering, evaluation of and time-consuming review exercise. I deeply appreciate
liquefaction potential of soils. The new scope of the “Soils the diligence and cooperation of the authors during the
and Foundations” chapter is in line with the codes exhaustive process. Final editing of this huge document has
reviewed and requirements of the Geotechnical been extremely tedious. We tried to present the entire
professionals of the country. document in a uniform format. To enhance readability,
Depletion of energy resources and environmental changes many figures of the previous version of the code have been
is a major concern worldwide. Bangladesh is no exception redrawn and improved. However, we regret any
to it. Keeping these aspects in mind, changes and unintentional editorial or typographical mistakes that may
modifications have been suggested in BNBC 1993 for use of still exist in the code.
energy saving appliances, non-conventional fuels etc. in
ii
Steering Committee
Convener
Kazi Golam Nasir ( From January 2015)
Ahsanul Haque Khan (From December 2011 to January 2015)
A.S.M Ismail (From October 2006 to December 2011)
Abdus Salam (till October 2006)
Chief Architect
Department of Architecture, Ministry of Works
Government of Bangladesh
Members
Representing Name & Address
Institution of Engineers, BangladeshBNBC 2015 FINAL DRAFTEngr. Md. Ruhul Matin (F-970)
Engr. Moid Uddin Rumi
Institute of Architects, Bangladesh Jalal Ahmed (from April 2015)
Kazi Golam Nasir
Institute of Planners, Bangladesh Dr. Akter Mahmud
Joint Secretary
Bangladesh Institute of Planners
Planners Tower, 7th Floor, Bangla Motor, Dhaka.
Bangladesh University of Engineering & Technology
Civil Engineering Dr. Mehedi Ahmed Ansary
Professor
Department of Civil Engineering, BUET, Dhaka.
Mechanical Engineering Dr. Md. Zahrul Haque
Professor
Department of Mechanical Engineering, BUET, Dhaka
Electrical & Electronics Engineering Dr. Shahidul Islam Khan
Professor
Department of Electrical & Electronics Engineering, BUET, Dhaka
Department of Architecture Dr. Sheikh Ahsanullah Mojumder
Professor
Department of Architecture, BUET, Dhaka
Urban and Regional Planning Dr. Ishrat Islam
Professor
Department of Urban & Regional Planning, BUET, Dhaka
iii
Public Works Department Engr. Ainul Farhad
Addl. Chief Engineer (P & SP)
Engr. Md. Abdul Malek Sikder
Addl. Chief Engineer (P & SP)
Engr. Abul Kashem
Addl. Chief Engineer (P & SP)
Engr. Md. Abdul Mozid Shikder
Addl. Chief Engineer (P & SP)
Syed Azizul Haque
Executive Engineer
Rajdhani Unnayan KartripakkhaBNBC 2015 FINAL DRAFTEngr. Emdadul Islam
Engr. Md. Salahuddin
Chief Engineer
Rajdhani Unnayan Kartripakkha, Dhaka
Fire Service and Civil Defence Directorate Md. Zahurul Amin Mia
Deputy Director (Dhaka Division)
Fire Service and Civil Defence Department, Dhaka
Bharat Chandra Biswas
Deputy Director (Planning & Training)
Fire Service and Civil Defence Department, Dhaka
Sheikh Md. Mizanur Rahman
Deputy Director (Planning & Training)
Fire Service and Civil Defence Department, Dhaka
Department of Environment Dr. Muhammad Sohrab Ali
Deputy Director
Department of Environment
Dr. Engr. Mostafa Kamal Faruk
Director
Department of Environment
Engr. Md. Shahjahan
Director
Department of Environment
iv
Bangladesh Standards and Testing Institution
Engr. Md. Saidul Islam
Deputy Director(Engineering)
Bangladesh Standards and Testing Institution, Dhaka
Engr. Md. Khalilur Rahman
Director(Engineering)
Bangladesh Standards and Testing Institution, Dhaka
Ministry of Housing and Public Works Jalal Ahmed
Deputy Chief, Planning
Ministry of Works
Government of Bangladesh, Dhaka
Farid Aziz
Deputy Chief, Planning
Ministry of Works
Government of Bangladesh, Dhaka
BNBC 2015 FINAL DRAFT
Ministry of Law, Justice and Parliamentary Affairs
Humayun Farhad
Deputy Secretary
Legislative & Parliamentary Affairs Division
Ministry of Home Affairs Md. Salimullah
Deputy Secretary
Ministry of Home Affairs
Geological Survey of Bangladesh Reshad Md. Ekram Ali
Director
Geological Survey of Bangladesh, Dhaka
Department of Disaster Management Md. Khorshed Alam
Executive Engineer
Department of Disaster Management
Mohammad Abu Sadeque PEng.
Director
Disaster Management Bureau
Military Engineering Services Major Md. Soebur Rahman PEng.
Personal Capacity SO-II (Design), E-in-C's Branch
Army Headquarters, Dhaka
Brig. General Habibur Rahman
Md. Abdus Salam
Senior Research Engineer
Housing and Building Research Institute
v
Member Secretary
Mohammad Abu Sadeque
Syed Isar Hossain
Md. Kabir Ahmed Bhuyan
Mainuddin Ahmed
Director
Housing and Building Research Institute
Darus-Salam, Mirpur, Dhaka
Associates
Saika Binte Alam
Assistant Chief Architect
Md. Nafizur Rahman
Senior Research Architect
Department of Architecture BNBC 2015 FINAL DRAFT
Housing & Building Research Institute
vi
Editorial Sub-committees
Part 1 and 2 : Scope and Definitions, Administration and Enforcement
Convener
Ar. Shah Alam Zahiruddin Zahiruddin & Associates Ltd.
Siza Court 152, Monipuripara,
Tejgaon, Dhaka-1215.
Members
Engr. Md. Ruhul Matin Flat-D/5, The Reviewra , House-7, Road-51, Block-NW(G)
Gulshan-2, Dhaka.
Mr. Humayun Farhad Deputy Secretary
Legislative & Parliamentary Affairs Division
Ministry of Law, Justice & Parliamentary Affairs Division
Bangladesh Secretariat, Dhaka-1000
Ar. Haroon-ur-Rashid House-23, Road-13
Sector-7, Uttara Model Town, Dhaka.
BNBC 2015 FINAL DRAFT
Ar. Kazi Golam Nasir Deputy Chief Architect
Department of Architecture
Segun Bagicha, Dhaka
Part 3 and 10 : General Building Requirements, Control and Regulation; Signs and Outdoor Display
Convener
Ar. Bashirul Haq Bashirul Haq & Associates Ltd.
35-B/2, Indira Road, Dhaka-1215
Members
Dr. Khandaker Shabbir Ahmed House-105, Block-A, Road-4,
Banani, Dhaka-1213
Dr. Khurshid Zabin Hossain Taufique Urban Development Directorate (UDD)
Ministry of Housing and Public Works
82, Segunbagicha, Dhaka.
Mr. Jahid Hasan Faruki Project Director
Lake Development Project
Rajdhani Unnayan Kortipakha (RAJUK), Dhaka-1000.
Dr. Abu Sayeed M Ahmed Dept. of Architecture,
The University of Asia Pacific
House-51, Road-4A, Dhanmondi, Dhaka-1209
Part 4 : Fire Protection
Convener
Mr. Solaiman Chowdhury Deputy Director (Retd)
Fire Service & Civil Defence Department
Members Flat: C-4, 1/G, Paribagh (Beside Paribagh Mosque), Dhaka-1000
Ar. Khandaker Tazuddin
Arcanum
70/2, Magh Bazar, Dhaka-1217
vii
Ar. Mohammad Foyez Ullah Managing Director
Mr. Bharat Chandra Biswas Volume Zero Ltd
Dr. Md. Maksud Helali House-98, Road-25, Block-A
Banani, Dhaka-1213
Deputy Director(Operation & Maintenance)
Bangladesh Fire Service & Civil Defense Department
Kazi Alauddin Road, Dhaka-1000
Professor
Department of Mechanical Engineering
BUET, Dhaka-1000
Part 5 : (a) Building Materials (Masonry, Steel, Cement, Concrete, Building Limes, Timber & Wood ) : Construction
BNBC 2015 FINAL DRAFT
Related Material/ Structural
Convener
Dr Shamim Z Bosunia Apt-501, House No-62, Road-27
Gulshan, Dhaka- 1212.
Members
Engr. Md. Shamsul Alam Consultant, The Designers and Managers
House no - 91, Road- 9/A (New),
Dhanmondi R/A, Dhaka
Engr. Md. Anwar Hossain Additional Chief Engineer (Retd., PWD)
Procurement Expert
PIU-BARC, NATP: Phase-1, Admin Building (2nd Floor)
BARC Complex, Farmgate, Dhaka-1215.
Engr. Md. Saidul Islam Deputy Director (Engineering)
Bangladesh Standard & Testing Institution
116/A, Tejgaon Industrial Area, Dhaka-1208
Engr. Md. Abdul Wahed Senior Research Engineer
Housing and Building Research Institute
Darus-Salam, Mirpur, Dhaka-1216.
Part 5 : (b) Building Materials (Timber, Wood Products, Flooring, Aluminium, Glass): Finishing Related
Material/Architectural )
Convener
Dr. Md. Fakhrul Islam Professor & Head
Dept. of Glass & Ceramic Engineering
BUET, Dhaka-1000
Members Vistaara Architects (Pvt.) Ltd.
Ar. Khan Md. Mustapha Khalid Apt.-D1, Se(H)-6, Rd-143, Gulshan, Dhaka-1212
Engr. Mamun Ahmad House-327, Lane-5(West)
Baridhara DOHS. Dhaka-1206
viii
Part 6 : (a) Structural Design (General Design Requirements, Loads, Masonry, Timber , Bamboo Structures)
Convener
Engr. Sajidur Rahman Director
Shahidullah & Associate Ltd
137, Jahanara Garden
Green Road, Dhaka-1205
Members Additional Chief Engineer, P&SP
Engr. Abdul Mozid Shikder Head Office
Public Works Department
Segun bagicha, Dhaka-1000
Md. Ahsan Habib P.Eng Executive Engineer, Design Division - 1
Public Works Department
Segun Bagicha, Dhaka-1000
BNBC 2015 FINAL DRAFT
Part 6 : (b) Structural Design (Soils & Foundation )
Convener
Dr. Md. Zoynul Abedin Professor and Head
Department of Civil Engineering
BUET, Dhaka.
Members Director
Mr. Reshad Mohammad Ekram Ali Geological Survey of Bangladesh
Pioneer Road, Segun Bagicha, Dhaka-1000
Maj. Gen(Rtd) Md. Ismail Faruque Chowdhury Executive Director
Mirpur Ceramic Works Ltd.
Kalshi, Mirpur Section # 12,
P.S: Pallabi, Dhaka-1216.
Engr. Mohammad Abu Sadeque P Eng. Flat-E1, Bldg-11
Govt. Officer's Quarter
Eskaton Garden Road, Ramna, Dhaka-1000
Dr. Abdul Jabber Khan Professor
Dept. of Civil Engineering
BUET, Dhaka
Dr. Ishrat Islam Professor
Dept of Urban & Regional Planning
BUET, Dhaka
Dr. Mehedi Ahmed Ansari Professor
Department of Civil Engineering, BUET, Dhaka
ix
Part 6 : (c) Structural Design (Concrete Material, RC Design USD/WSD, Detailing of RC Structures, Ferro cement
Structures)
Convener
Engr. AH Md. Motiur Rahman Addl. Chief Engineer - PWD (Retd)
House-59, Road-7A, Flat-4C
Dhanmondi, Dhaka-1205
Members
Engr. Md. Rafiqul Islam Executive Engineer
Design Division - 3
Room No-702(6th Floor)
Public Works Department
Segun Bagicha, Dhaka-1000
Dr. Iftekhar Anam Associate Professor
The University of Asia Pacific
Block#C, House# 53/1, Road# 4A
Dhanmondi R/A, Dhaka 1209.
BNBC 2015 FINAL DRAFT
Engr. Syed Isar Hossain Principal Research Engineer
Housing and Building Research Institute
Darus-Salam, Mirpur, Dhaka-1216.
Part 6 : (d) Structural Design (Prestressed Concrete)
Convener
Engr. Md. Abdus Sobhan Managing Director
Design, Planning & Management Consultants Ltd.
House No-4/1(2nd Floor), Road-4
Dhanmondi R/A, Dhaka-1205
Members
Engr. Md. Siddique Ullah House No-62, Flat No-302
Road No-27, Gulshan-1
Dhaka-1212
Engr. Mainuddin Ahmed Director (Attached to Ministry)
Housing and Building Research Institute
Darus-Salam, Mirpur, Dhaka-1216.
Part 6 : (e) Structural Design (Steel, Steel-Concrete Composite Structures)
Convener
Dr. Ishtiaque Ahmed Professor
Department of Civil Engineering
BUET, Dhaka-1000
Member
Engr. Md. Abdur Razzaque Executive Director
Axis Design Consultants Ltd.
Tower Hamlet (14th Floor)
16, Kemal Ataturk Avenue
Banani, Dhaka-1213, Bangladesh
Engr. Md. Shahid Uddin Azad Multi-Concept Steel Building Products Ltd.
House-456 (1st Floor), Road-31
New DOHS, Mohakhali, Dhaka.
x
Part 7 : Construction Practices and Safety
Convener
Ar. Khadem Ali Khadem Ali Associates
House-98, Road-13A, Block-D, Banani, Dhaka-1213
Members
Engr. Md. Abdus Sabur PEng. Flat # 8B2, Navana Banu Garden
115, Baro Mogbazar,Kazi office Lane
Dhaka-1217
Engr. Aftabuddin Ahmed Managing Director
Shamsuddin Mia & Associates Ltd.
64, Bijoynagar, Dhaka-1000, Bangladesh.
Engr. M. A. Awal Managing Director
Structural Engineers Ltd
SEL Centre
29, West Panthapath, Dhaka-1205
BNBC 2015 FINAL DRAFT
Engr. Md. Abdus Salam Senior Research Engineer
Housing and Building Research Institute
Darus-Salam, Mirpur, Dhaka-1216.
Part 8 : (a) Building Services (Lighting, Electrical Installation and Computer Networking)
Convener
Dr. Shahidul Islam Khan Professor
Department of Electrical & Electronic Engineering
BUET, Dhaka-1000
Members
Engr. Md. Naseem House No-12, Road No-3, Block -I
Banani, Dhaka-1213
Ar. BKS Inan CWN (B) 18/B, Road-44
Gulshan-2, Dhaka-1212.
Engr. Mokaddas Hossain Manager, Project Planning
Dhaka Power Distribution Company (DPDC)
Bidyut Bhavan(11th Floor)
1, Abdul Gani Road
Dhaka-1000
Part 8 : (b) Building Services (HVAC, Lifts, Escalators and Moving Walks)
Convener
Dr. Dipak Kanti Das Professor
Dept. of Mechanical Engineering
BUET, Dhaka-1000
Members Professor
Dr. Md. Zahurul Haq Dept. of Mechanical Engineering
BUET, Dhaka-1000
xi
Part 8 : (c) Building Services (Acoustics, Sound Insulation and Noise Control)
Convener Chief Architect (retd)
Ar. ASM Ismail Dept. of Architecture
92, Kakrail, Dhaka-1000
Members Managing Director
Mr. Zahidur Rahim Joarder Communications Technologies Ltd.
1/10, Block-A, 1st Floor, Road-5
Lalmatia, Dhaka-1207
Ar. SM Najmul Imam
Associate Professor, Dept. Of Architecture
BUET, Dhaka-1000
BNBC 2015 FINAL DRAFT
Part 8 : (d) Building Services (Water Supply, Drainage and Sanitation, Fuel & Gas Supply, Rain Water Management)
Convener
Dr M Feroze Ahmed Professor
Department of Civil Engineering
Bangladesh University of Engineering and Technology, Dhaka
Members
Engr. Khurshidul Hasan Apt-A2, SOFIA GREEN
House -49, Road-6, Block-C
Banani, Dhaka-1213
Engr. Md Wali Ullah Deputy Project Director (Urban)
GOB-UNICEF Project
Department of Public Health Engineering
DPHE Bhavan
14, Shahid Capt. Monsur Ali Sarani, Kakrail, Dhaka.
Part 9 : Alteration, Addition to and Change of Use of Existing Buildings
Convener
Ar. Jalal Ahmed Principal Architect
JA Architects Ltd
House: C-1(First floor) Rabbi House
CEN(B)11, Road-99, Gulshan-2
Dhaka 1212, Bangladesh
Members
Professor Dr. Akter Mahmud Joint Secretary
Bangladesh institute of Planers
Planers tower, 7th floor 13/a, Bir uttam CR Dutta road, Banglamotor, Dhaka-
1000.
Ar. Mamnoon Murshed Chowdhury DWm4 Architects
House-382, Road-28,
New DOHS, Mohakhali, Dhaka-1206
Engr. Md. Abdul Malek Sikder Superintending Engineer
Design Circle-1, Public Works Department
Segun Bagicha, Dhaka-1000
xii
Engr. Md. Akhtaruzzaman Project Officer
Housing and Building Research Institute
Darus-Salam, Mirpur, Dhaka-1216.
Part 3 : Sustainable Development (Green Building Technology, Renewable energy, Waste Management, Climate change)
Convener Associate Professor
Ar. Sheikh Ahsan Ullah Mojumder Dept. of Architecture
BUET, Dhaka-1000.
Members
Dr. Saiful Huque Secretary BSES
Member National Committee of Renewable Energy
Renewable Energy Research Center (RERC)
University of Dhaka
BNBC 2015 FINAL DRAFT
Dr. Muhammad Sohrab Ali Deputy Director
Ar. Md. Nafizur Rahman Department of Environment
Ar. Saiqua Bente Alam E/16, Agargaon
Banani Model Town, Dhaka-1213
Senior Research Architect
Housing and Building Research Institute
Darus-Salam, Mirpur, Dhaka-1216.
Assistant Architect
Dept. of Architecture
Stapathya Bhavan, Segunbagicha, Dhaka.
xiii
BNBC 2015 FINAL DRAFT List of Consultants
Bureau of Research, Testing and Consultation (BRTC), BUET, Dhaka, Bangladesh.
Team Leaders:
Prof. Dr. Md. Zoynul Abedin
Prof. Dr. Md. Hossain Ali
Consultants:
Prof. Dr. A. F. M. Saiful Amin
Prof. Dr. A. K. M. A. Quader
Prof. Dr. A. M. M. Taufiqul Anwar
Prof. Dr. Abu Siddique
Engr. Ahmadul Hassan
Prof. Dr. Ahsanul Kabir
Engr. Belal Ahmed
Prof. Dr. Farooque Ahmed
Prof. Dr. Khan Mahmud Amanat
Prof. Dr. Mahbuba Begum
Prof. Dr. Md. Humayun Kabir
Prof. Dr. Md. Shafiul Bari
Prof. Dr. Md. Shahidul Ameen
Prof. Dr. Mohammad Shariful Islam
Prof. Dr. Mohammed Kabirul Islam
Prof. Dr. Muhammad Zakaria
Prof. Dr. Munaz Ahmed Noor
Prof. Dr. Raquib Ahsan
Engr. Sabbir Siddiquee, P.Eng.
Prof. Dr. Saiful Islam
Arch. S. M. Najmul Imam
Engr. Syed Azizul Haq, P.Eng.
Prof. Dr. Syed Fakhrul Ameen
Prof. Dr. Tahmeed M. Al-Hussaini
Prof. Dr. Tahsin Reza Hossain
Prof. Dr. Zebun Nasreen Ahmed
Arch. Ziaul Islam
Team Leader’s Editorial Cell:
Engr. Bushra Islam
Engr. Galib Muktadir
Engr. Md. Ashiquzzaman
Engr. Md. Ruhul Amin
Team Leader’s Editorial Staff:
Mr. Md. Abu Mosa
Mr. Md. Fakhrul Islam
Mr. Md. Shamiul Alam
xiv
Summary Table of Contents
Preface
Steering Committee
Editorial Subcommittees
Consultants
Summary Table of Contents
PART 1 SCOPE AND DEFINITIONS VOL-1
Chapter 1 Title, Scope and General Page 1-1 to 1-10
Chapter 2 Definitions
Chapter 3 Abbreviations VOL-1
PART 2 ADMINISTRATION AND ENFORCEMENT Page 2-1 to 2-30
Purpose and Applicability VOL-1
Organization and Enforcement
Permits and Inspections Page 3-1 to 3-172
Chapter 1 BNBC 2015 FINAL DRAFT
VOL-1
Chapter 2
Chapter 3 PAGE 4-1 TO 4-68
Appendices
Vol-1
PART 3 GENERAL BUILDING REQUIREMENTS, CONTROL AND REGULATION
Page 5-1 to 5-60
Chapter 1 General Building Requirements
Chapter 2 Classification of Buildings Based on Occupancy Vol-2
Chapter 3 Classification of Building Construction Type Based on Fire Resistance
Chapter 4 Energy Efficiency and Sustainability Page 6-1 to 6-906
Appendices
xv
PART 4 FIRE PROTECTION
Chapter 1 General Provisions
Chapter 2
Chapter 3 Precautionary Requirements
Chapter 4 Means of Egress
Chapter 5
Appendices Equipment and In-Built Facilities Standards
Specific Requirements for Fire Detection and Extinguishing System
PART 5 BUILDING MATERIALS
Chapter 1 Scope and Definitions
Chapter 2 Building Materials
PART 6 STRUCTURAL DESIGN
Chapter 1 Definitions and General Requirements
Chapter 2 Loads on Buildings and Structures
Chapter 3
Soils and Foundations
Summary Table of Contents (Continued)
Chapter 4 Bamboo
Chapter 5 Concrete Material
Chapter 6 Strength Design of Reinforced Concrete Structures
Chapter 7 Masonry Structures
Chapter 8 Detailing of Reinforced Concrete Structures
Chapter 9 Prestressed Concrete Structures
Chapter 10 Steel Structures
Chapter 11 Timber
Chapter 12 Ferrocement Structures
Chapter 13
Appendices Steel-Concrete Composite Structural Members
PART 7 CONSTRUCTION PRACTICES AND SAFETY VOL-3
Chapter 1 BNBC 2015 FINAL DRAFT Page 7-1 to 7-84
Constructional Responsibilities and Practices
Chapter 2 VOL-3
Storage, Stacking and Handling Practices
Chapter 3 Page 8-1 to 8-350
Chapter 4 Safety During Construction
Chapter 5 Demolition Work VOL-3
Appendices Maintenance Management, Repairs, Retrofitting and Strengthening of Buildings
Page 9-1 to 9-14
PART 8 BUILDING SERVICES
Chapter 1 Electrical and Electronic Engineering Services For Buildings
Chapter 2 Air-Conditioning, Heating and Ventilation
Chapter 3 Building Acoustics
Chapter 4 Lifts, Escalators and Moving Walks
Chapter 5 Water Supply
Chapter 6 Sanitary Drainage
Chapter 7 Rainwater Management
Chapter 8 Fuel Gas Supply
Appendices
PART 9 ALTERATION, ADDITION TO AND CHANGE OF USE OF EXISTING BUILDINGS
Chapter 1 Applicability and Implementation
Evaluation and Compliance
Chapter 2 Conservation
Chapter 3
PART 10 SIGNS AND OUTDOOR DISPLAY VOL-3
Page 10-1 to 10-20
Chapter 1 Scope and General
Chapter 2 General Requirements
Chapter 3 Specific Requirements for Various Types of Signs
Appendices
xvi
PART 1 BNBC 2015 FINAL DRAFT
SCOPE AND
DEFINITION
PART 1
Chapter 1 TITLE, SCOPE AND GENERALBNBC 2015 FINAL DRAFTPage
Chapter 2 DEFINITIONS
Chapter 3 ABBREVIATIONS 1-1
1-3
1-7
TABLE OF CONTENTS
PART 1 SCOPE AND DEFINITION
Chapter 1 TITLE, SCOPE AND GENERAL 1-1
1.1 TITLE 1-1
1.2 PURPOSE 1-1
1.3 SCOPE 1-2
1.4 EXISTING BUILDINGS 1-2
1-2
1.4.1 Addition and Alteration 1-2
1.4.2 Change of Use
1.5 HISTORIC OR ARCHITECTURALLY VALUABLE BUILDINGS 1-3
1-3
Chapter 2 DEFINITIONS
2.1 GENERAL 1-7
2.2 DEFINITIONS OF TERMS 1-8
BNBC 2015 FINAL DRAFT
Chapter 3 ABBREVIATIONS
3.1 ABBREVIATIONS OF NAMES
3.2 ABBREVIATIONS OF WORDS
1-i Vol. 1
BNBC 2015 FINAL DRAFTPart 10
Signs and Outdoor Display
This page is intentionally left blank.
1-ii Vol. 1
Chapter 1
TITLE, SCOPE AND GENERAL
1.1 TITLEBNBC 2015 FINAL DRAFT
The provisions and regulations contained in this document shall constitute and be collectively known and may
be cited as the "Bangladesh National Building Code 2015", abbreviated, where desired, as BNBC, and will
hereinafter be referred to as the "Code".
1.2 PURPOSE
The purpose of this Code is to establish minimum standards for design, construction, quality of materials, use
and occupancy, location and maintenance of all buildings within Bangladesh in order to safeguard, within
achievable limits, life, limb, health, property and public welfare. The installation and use of certain equipment,
services and appurtenances related, connected or attached to such buildings are also regulated herein to
achieve the same purpose.
The provisions of this Code are applicable to all persons of Bangladesh irrespective of class, creed, culture,
religion or sex. The Code does not in any way create or otherwise establish or designate any particular class or
group of persons who will or should be specially protected or benefited by the provisions of this Code.
The expressed intent of this Code is to ensure public safety, health and general welfare insofar as they are
affected by the construction, alteration, repair, removal, demolition, use or occupancy of buildings, structures or
premises, through structural strength, stability, means of egress, safety from fire and other hazards, sanitation,
light and ventilation.
1.3 SCOPE
The provisions of this Code shall apply to the design, construction, use or occupancy, alteration, moving,
demolition and repair of any building or structure and to any appurtenances installed therein or connected or
attached thereto, except such matters as are otherwise provided for in other ordinances and statutes
controlling and regulating buildings.
If for any case different sections of this Code provide different specifications for materials, methods of design or
construction, or other requirements, the most restrictive specification shall govern.
In case of any conflict between a general requirement and a specific requirement, the specific requirement shall
be applicable.
Unless otherwise explicitly stated in this Code, all references to part, chapter or section numbers or to
provisions not specifically identified by number, shall be construed to refer to such part, chapter, section or
provision of this Code.
References made to a section without mentioning a part shall be construed to refer to that section of the part in
which the reference is made.
The provisions of any appendix in this Code shall not be mandatory unless they are referred to as such in any
section of the Code or they are specifically adopted by any regulation.
Part 1 1-1
Scope and Definition
BNBC 2015 FINAL DRAFTPart 1
Scope and Definition
Inspection conducted or permission granted for any building or plan of building, under the provisions of this
Code, shall not be construed as a warranty of the physical condition of such building or the adequacy of such
plan. Neither the Authority administering the Code, nor any employee thereof shall be liable for damages or any
defect or hazardous or illegal condition or inadequacy in such building or plan, nor for any failure of any
component of such building which may occur subsequent to such inspection or granting of permission under the
provisions of the Code.
1.4 EXISTING BUILDINGS
Buildings which are in existence on the date of promulgation of this Code may have their use or occupancy
continued without undergoing any alteration, abandonment or removal unless in the opinion of the Authority
such continued use is hazardous to life and property and provided such use or occupancy was legal on the date
of promulgation of this Code. Buildings approved before adoption of the present updated Code and compliant
with the previous version of the Code may continue to be used or occupied unless any deviation is made
thereafter or any deterioration has rendered the building unsafe in the opinion of the Authority.
1.4.1 Addition and Alteration
Additions, alterations, modifications or repair to an existing building may be made without requiring the existing
building to comply with all the requirements of this Code, provided the additions, alterations, modifications or
repairs conform to that required for a new building. Such additions or alterations shall not be permitted when
the existing building is not in full compliance with the provisions of this Code except when the addition or
alteration will result in the existing building or structure being no more hazardous based on life safety, fire
safety and sanitation than it was before the addition or alteration was undertaken.
Any building together with the new additions shall not exceed the height, number of storey’s and area specified
in this Code for new buildings having the relevant occupancy and type of construction. Non-structural
alterations or repairs to an existing building or structure which do not adversely affect any structural member,
nor reduce the strength of any part of the building or structure to result in an unsafe condition shall be made
with materials and components having the required fire resistance.
1.4.2 Change of Use
Change in use or occupancy in an existing building may be made when such change complies with the
requirements of this Code for a new building and provided such change does not render any part or the whole
of the affected building or structure any more hazardous based on life safety, fire safety and sanitation than it
was before such change was effected.
1.5 HISTORIC OR ARCHITECTURALLY VALUABLE BUILDINGS
A building or structure which has been designated by official action as having special historical or archaeological
interest, or a building or structure identified by a legally constituted authority as being architecturally valuable,
may be undertaken for repairs, alterations and additions necessary for its preservation, restoration,
rehabilitation or continued use provided:
(a) the proposed repair, alteration or addition to buildings of historical or archaeological significance is
approved by the legally constituted authority, such as the Department of Archaeology;
(b) the proposed repair, alteration or addition to buildings of architectural value does not impair the
aesthetic quality and architectural character of such buildings; and
(c) the restored building or structure will be no more hazardous, if any, based on life safety, fire safety and
sanitation than the existing building.
1-2 Vol. 1
Chapter 2
DEFINITIONS
2.1 GENERAL
Unless otherwise expressly stated, the abbreviations, terms, phrases, words and their derivations listed
below shall, for the purpose of this Code, be construed as set forth in this Chapter. Words not explicitly
defined shall have their ordinarily accepted meanings as the context implies as provided in The Oxford
English Dictionary, Second Edition, Simpson, J. & Weiner, E., Ed., Oxford University Press, London, 1989; and
Chambers Science and Technology Dictionary, Chambers Harrap Publishers Ltd, New York, 1999.
The terms defined in this Part shall have a general applicability to the entire Code. Other than these, there
are other terminology and definitions provided in different parts, chapters and sections which shall be
applicable only to that particular part, chapter or section in which they are defined. In case of any conflict or
contradiction between a definition given in this Part and that in any other part, chapter or section, the
meaning provided in that part, chapter or section shall govern for the interpretation of the provisions of
that particular part, chapter or section. In general, definitions given in a lower level shall override the
meanings of all upper levels for the interpretation of the provisions within the scope of that lower level.
BNBC 2015 FINAL DRAFT
2.2 DEFINITIONS OF TERMS
The terminologies used in this Code are defined in this Section. Irrelevance of gender, tense and number is
implicit in these definitions and throughout the Code. Words in the masculine gender include the feminine
and the masculine. Verbs used in the present include the future. Words used in the singular include the
plural and the words used in the plural include the singular.
ACCESSORY USE Any use subordinate to the major use which is normally incidental to the major use.
ALTERATION
Any change, addition or modification in construction such as structural, dimensional,
APPROVED or any removal of any part of a building or any change to or closing of any required
ARCHITECT means of ingress or egress or a change to the fixtures or equipment or any change in
AUTHORITY land use or occupancy or use.
AUTHORIZED Approved by the Authority.
OFFICER
BASEMENT A person who has a Bachelor Degree in Architecture and is a member of the Institute
BUILDING of Architects, Bangladesh (IAB).
The Authority which has been created by a statute and which, for the purpose of
administering the Code or Part thereof, may authorize a committee or an official to act
on its behalf. (This definition of Authority shall apply to all appearances of the term in
this Code written with a capital A).
Same as Building Official.
A floor of a building more than 50 percent of which is situated at a depth of 1m or
more below crown of the main entry road.
Any permanent or semi-permanent structure which is constructed or erected for
human habitation or for any other purpose and includes but not limited to the
Part 1 1-3
Scope and Definition
Part 1
Scope and Definition
BUILDING LINE BNBC 2015 FINAL DRAFTfoundation, plinth, walls, floors, roofs, stairs, chimneys, fixed platform, verandah,
balcony, cornice, projections, extensions, annexes etc. The term building will also
BUILDING include the sanitary, plumbing, electrical, HVAC, appurtenances and all other building
OFFICIAL service installations which are constructed or erected as an integral part of a building.
COMMITTEE
The line up to which the plinth of a building may lawfully extend. Also known as
CONSTRUCT, TO SETBACK LINE.
CONVERSION
A person who is the jurisdictional administrator of Building Code appointed by the
COVERED AREA Bangladesh Building Regulatory Authority (BBRA).
DEVELOPMENT A Building Construction Committee constituted for any area in the prescribed manner,
if necessary.
DIPLOMA
ARCHITECT See ERECT, TO.
DIPLOMA The change in occupancy or premises to any occupancy or use requiring new
ENGINEER occupancy permit.
DRAIN The ground area above the plinth level which is covered by a building structure. The
covered area of a building shall exclude gardens, wells, cornice, sunshade, pergola,
DRAINAGE septic tank, soak well, unpaved uncovered water body, fountains, drainage structures,
ENGINEER boundary wall, gates, porch, uncovered staircase, watchman's cabin, detached pump
house, garbage chutes and other uncovered utility structures.
ERECT, TO
Carrying out construction of buildings, engineering, mining or other operations in, or
FORMATION over or under land or water. Includes re-development and layout and subdivision of
LEVEL any land. 'To develop' and other grammatical variations shall be interpreted
GEOTECHNICAL accordingly.
ENGINEER
A person who has a Diploma in Architecture from any recognized Polytechnic or
ENGINEERING Technical Institute and is a member of the Institute of Diploma Engineers, Bangladesh
GEOLOGIST (IDEB).
GOVERNMENT
GRADE A person who has a Diploma in Engineering from any recognized Polytechnic or
Technical Institute and is a member of the Institute of Diploma Engineers, Bangladesh
(IDEB).
A conduit or channel for conveying water, sewage, or other waste liquid for
subsequent disposal.
The disposal of any liquid with a system meant for this purpose.
A person who has a Bachelor Degree in Engineering and is a member of the Institution
of Engineers, Bangladesh (IEB).
To erect a new building or re-erect an existing building or to convert a building from
one occupancy to another. Also known as CONSTRUCT, TO.
Finished ground level of a plot. For hilly areas formation levels shall be the gradient of
the plot surface.
Engineer with Master’s degree in geotechnical engineering having at least 2 (two)
years of experience in geotechnical design/construction or graduate in civil
engineering/engineering geology having 10 (ten) years of experience in geotechnical
design/construction.
A person having a postgraduate degree in engineering geology and having 2 years
experience in geotechnical exploration and interpretation.
The government of the People's Republic of Bangladesh.
The lowest point of elevation of the finished surface of the ground, pavement or
footpath within the area between the building and the property line or a line 1.5 m
from the building whichever is nearer the building.
1-4 Vol. 1
Definitions Chapter 2
HEIGHT OF BNBC 2015 FINAL DRAFTThe vertical distance from a reference datum to the highest point of the building which
BUILDING includes all building appurtenances like overhead water tank, machine room,
communication tower etc. The reference datum shall be the elevation of the nearest
HIGH RISE footpath or the elevation of the nearest road or street or public way at its centre line,
BUILDING whichever is higher.
OCCUPANCY OR Any building which is more than 10-storey or 33 m high from reference datum.
USE GROUP Building appurtenances like overhead water tank, machine room, communication
OCCUPANCY, tower etc. will not be considered in determining the height.
MAJOR
OCCUPIER The purpose for which a building or a part thereof is used or intended to be used.
OWNER OF A The major or principal occupancy of a building or a part thereof which has attached to
BUILDING it subsidiary occupancy or occupancies contingent upon it.
PERMIT A person paying or liable to pay rent or any portion of rent of a building in respect of
which the ward is used, or compensation or premium on account of occupation of
PLANNER such building and also a rent-free tenant. Does not include a lodger and the words
'occupancy' and 'occupation' do not refer to the lodger. In such cases the owner
PLINTH AREA himself or herself is living in his or her own building, he or she shall be deemed to be
the occupier thereof.
PLINTH LEVEL
The person, organization or agency at whose expenses the building is constructed or
PLOT who has the right to transfer the same and includes his or her heirs, assignees and
PLUMBING legal representatives, and a mortgagee in possession.
ENGINEER
PUBLIC WAY A written document or certificate issued by the Authority for carrying out a specific
RELIABLE activity under the provisions of this Code.
LITERATURE
RELIABLE A person who has a Bachelor or a Post-Graduate Degree in Planning and is a member
REFERENCE of the Bangladesh Institute of Planners (BIP).
ROAD The elements from the building bases which are exposed above the formation level to
form a covered floor area by joining the peripheral points of the elements which are
ROAD LINE intersected at finished floor plane at the height of plinth level.
ROOM HEIGHT
Height of a covered finished floor which is not more than 1m above the formation level
SANCTIONED nor 1.85 m from the crown of adjacent road level.
PLAN
SERVICE ROAD See SITE.
An Engineer (Civil/Mechanical) who has experience in the field of plumbing or
sanitation.
See ROAD.
See RELIABLE REFERENCE.
Reference materials such as published article, codes, standards or other material
judged to be reliable by the professional users and specialists in the subject concerned.
This may also be referred to as RELIABLE LITERATURE.
A thoroughfare or public way which has been dedicated or deeded to the public for
public use. Also known as STREET.
A line defining the side limits of a road.
The clear head room between the finished floor surface and the finished ceiling
surface or the underside of the joists or beams, whichever is lower.
The set of plans, design and specifications of a building submitted to the Authority as
per provision of this Code and duly approved and sanctioned by the Authority.
A road or lane provided at the rear or side of a plot for service purposes.
Bangladesh National Building Code 2015 1-5
Part 1
Scope and Definition
SETBACK LINE See BUILDING LINE.
SITE
A piece or parcel of land on which a building is intended to be or has already been
SPECIALIST constructed. Also known as PLOT.
STOREY A professional who by education, research, practice and experience specializes in a
particular branch of a broader discipline and is generally judged to be so by the
STOREY, FIRST professional body in the relevant discipline.
STREET The portion of a structure between tops of two successive finished floor surfaces and
STREET LEVEL for the topmost story, from surface of the finished floor of topmost floor to the top of
STREET LINE the roof above.
SUPERVISOR,
CONSTRUCTION The lowest storey in a building which qualifies as a storey as defined herein; for a
UNSAFE building with a basement it is the storey just above the basements.
BUILDING
See ROAD.
The elevation of the centre line of any road or street which a plot fronts.
See ROAD LINE.
An Architect or Engineer or Diploma Architect or Diploma Engineer having experience
in supervision of construction works.
A building which, in the opinion of the Building Official, is structurally unsafe, or
insanitary, or lacks proper means of ingress or egress, or which constitutes a hazard to
life or property.
BNBC 2015 FINAL DRAFT
1-6 Vol. 1
Chapter 3
ABBREVIATIONS
3.1 ABBREVIATIONS OF NAMES
Names of institutions, organizations and professional societies referred to in this Code are listed below in an
alphabetical order.
ACI BNBC 2015 FINAL DRAFTAmerican Concrete Institute; Box 19150, Redford Station, Detroit, MI 48219, USA.
AISC
AISE American Institute of Steel Construction, Inc.; 400 North Michigan Avenue, Chicago, IL 60611, USA.
AISI Association of Iron and Steel Engineers; Suite 2350, Three Gateway Center, Pittsburgh, PA 15222,
ANSI USA.
ASHRAE
American Iron and Steel Institute; Suite 300, 1133 15th Street N.W., Washington, DC 20005, USA.
ASME
American National Standards Institute; 1430 Broadway, New York, NY 10018, USA.
ASTM
AWS American Society of Heating, Refrigerating and Air-conditioning Engineers, Inc.; 345 East 47th Street,
BIP New York, NY 10017, USA.
BOCA American Society of Mechanical Engineers; United Engineering Centre, 345 East 47th Street, New
York, NY 10017, USA.
BPDB
American Society for Testing and Materials; 1916 Race Street, Philadelphia, PA 19103, USA.
BSI
BSTI American Welding Society; 550 N.W. LeJeune Rd., P.O. Box 351040, Miami, FL 33135, USA.
BWDB Bangladesh Institute of Planners, Planners' Tower (Level-7), 13/A, Bir Uttam C.R. Datta (Sonargaon)
Road, Bangla Motor, Dhaka-1000, Bangladesh.
CDA
CGSM Building Officials and Code Administrators International Inc.; 1313 East 60th Street, Chicago,
DOA IL 60637, USA.
DPHE Bangladesh Power Development Board; WAPDA Building, Motijheel Commercial Area, Dhaka 1000,
Bangladesh.
EED
British Standards Institution; 2 Park Street, London W1A 2BS, UK.
Bangladesh Standards and Testing Institution; 116A Tejgaon Industrial Area, Dhaka 1208,
Bangladesh.
Bangladesh Water Development Board; WAPDA Building, Motijheel Commercial Area, Dhaka 1000,
Bangladesh.
Chittagong Development Authority; Station Road, Chittagong, Bangladesh.
Canadian General Standards Board; Technical Information Unit, Ottawa, CANADA K1A 1G6.
Department of Architecture; Sthapatya Bhaban, Shahid Capt. Mansur Ali Sarani, Segunbagicha,
Dhaka-1000, Bangladesh.
Department of Public Health Engineering; DPHE Bhaban, 14, Shaheed Captain Mansur Ali Sarani,
Kakrail, Dhaka-1000, Bangladesh.
Education Engineering Department; Shikkha Bhaban, Dhaka-1000, Bangladesh.
Part 1 1-7
Scope and Definition
Part 1
Scope and Definition
HED Health Engineering Department; Ministry of Health and Family Welfare, 105-106, Motijheel C/A,
Dhaka-1000, Bangladesh.
FM Factory Manual; Standards Laboratories Department, 1151 Boston Providence Turnpike, Norwood,
MA 02062, USA.
FSCD Fire Service and Civil Defence; Kazi Alauddin Road, Dhaka-1000, Bangladesh.
HBRI Housing and Building Research Institute; 120/3, Darus-Salam, Mirpur, Dhaka, Bangladesh.
IAB Institute of Architects, House-11(1st Floor), Road-4, Dhanmondi, Dhaka-1205, Bangladesh.
IEB Institution of Engineers, Ramna, Dhaka-1000, Bangladesh.
IDEB Institute of Diploma Engineers, IDEB Bhaban, 160/A, Kakrail VIP Road, Dhaka-1000, Bangladesh.
ICBO International Conference of Building Officials; 5360 South Workman Mill Road, Whittier, CA 90601,
USA.
ISO International Organization for Standardization; 1, Rue de Varembé, Case Postal 56, CH-1211, Genève
20, Switzerland.
ISSMFE International Society of Soil Mechanics and Foundation Engineering; University Engineering
Department, Trumpington St, Cambridge CB21PZ, UK.
BNBC 2015 FINAL DRAFT
KDA Khulna Development Authority; Shib Bari Crossing, Khulna-9100, Bangladesh.
LGED Local Government Engineering Department; LGED Bhaban, Sher-e-Bangla Nagar, Agargaon, Dhaka,
1207. Bangladesh.
NFPA National Fire Protection Association; Batterymarch Park, Quincy, MA 02269, USA.
NHA National Housing Authority; Grihayan Bhaban, 82, Segunbagicha, Dhaka, Bangladesh.
PWD Public Works Department; Purto Bhaban, Shahid Capt. Mansur Ali Sarani, Segunbagicha; Dhaka
1000, Bangladesh.
RAJUK Rajdhani Unnayan Kartripakkha; Rajuk Avenue, Motijheel, Dhaka-1000, Bangladesh.
RCSC Research Council on Structural Connections of the Engineering Foundation; American Institute of
Steel Construction (AISC).
RDA Rajshahi Development Authority; Rajshahi-6203, Bangladesh.
RMA Rubber Manufacturing Association; 1400 K Street N.W., Washington, DC 20005, USA.
SBCCI Southern Building Code Congress International; 3617 8th Ave, S. Birmingham, AL 35222, USA.
SMACNA Sheet Metal and Air Conditioning Contractors' National Association, 8224 Old Courthouse Road,
Tysons Corner, Vienna, VA 22180, USA.
SPRI Single Ply Roofing Institute; 104 Wilmont Road, Suite 201, Deerfield, IL 600015-5195, USA.
UDD Urban Development Directorate; Ministry of Housing and Public Works, 82, Segunbagicha, Dhaka-
1000, Bangladesh.
UL Underwriters Laboratories, Inc; 207 East Ohio Street, Chicago, IL 60611, USA.
3.2 ABBREVIATIONS OF WORDS
The abbreviations used in this Code are listed below in an alphabetical order. Abbreviations not explicitly
defined herein below shall be construed to have their usual meaning as the context implies.
BDS Bangladesh Standards; published by the BSTI
BNBC Bangladesh National Building Code; published by HBRI
BS British Standard; published by the BSI
1-8 Vol. 1
Abbreviations Chapter 3
CBF Concentric Braced Frame BNBC 2015 FINAL DRAFT
CFC Chlorofluorocarbon
CGI Corrugated Galvanized Iron
CWPC Cold Drawn Low Carbon Wire Prestressed Concrete
DCP Dry Chemical Powder (fire extinguisher)
DDT Dichlorodiphenyltrichloroethane
DPC Damp-proof Course
EBF Eccentric Braced Frame
FAR Floor Area Ratio
FM Fineness Modulus
FPA Flood Prone Area
GI Galvanized Iron
IBC International Building Code
IMRF Intermediate Moment Resisting Frame
IS Indian Standard; published by the Bureau of Indian Standards
LFD Load Factor Design
LPG Liquefied Petroleum Gas
MCSP Multipurpose Cyclone Shelter Program
OMRF Ordinary Moment Resisting Frame
RC Reinforced Concrete
RS Rolled Steel
RSJ Rolled Steel Joist
SMRF Special Moment Resisting Frame
SPA Surge Prone Area
SRSS Square Root of the Sum of the Squares
UBC Uniform Building Code; published by the ICBO
WSD Working Stress Design
cps Cycles per second
Bangladesh National Building Code 2015 1-9
BNBC 2015 FINAL DRAFTPart 1
Scope and Definition
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1-10 Vol. 1
PART 2
ADMINISTRATION
AND
ENFORCEMENT
BNBC 2015 FINAL DRAFT
PART 2
Chapter 1 BNBC 2015 FINAL DRAFTPURPOSE AND APPLICABILITYPage
Chapter 2 ORGANIZATION AND ENFORCEMENT
Chapter 3 PERMIT AND INSPECTIONS 2-1
Appendices 2-3
2-11
2-19
TABLE OF CONTENTS
PART 2 ADMINISTRATIONS AND ENFORCEMENT
Chapter 1 PURPOSE AND APPLICABILITY 2-1
1.1 PURPOSE 2-1
1.2 TERMINOLOGY 2-2
1.3 APPLICABILITY 2-2
2-2
1.3.1 Construction 2-2
1.3.2 Removal 2-2
1.3.3 Demolition 2-2
1.3.4 Alteration 2-2
1.3.5 Maintenance 2-2
1.3.6 Repair
1.3.7 Land Development 2-3
Chapter 2 ADMINISTRATION AND ENFORCEMENT 2-3
BNBC 2015 FINAL DRAFT 2-3
2.1 CODE ENFORCEMENT AGENCY 2-3
2.1.1 Establishment of Authority 2-3
2.1.2 Office of the Authority 2-4
2.1.3 Constitution of Authority 2-4
2.1.4 Responsibilities of the Authority 2-4
2.1.5 Qualifications of Members of the Authority 2-5
2-5
2.2 ENFORCEMENT AT THE FIELD LEVEL 2-5
2.3 BUILDING OFFICIAL 2-5
2.4 ADMINISTRATIVE JURISDICTION OF BUILDING OFFICIALS 2-6
2.5 MERGING THE JURISDICTIONS UNDER SMALL LOCAL BODIES 2-6
2.6 QUALIFICATION OF THE BUILDING OFFICIAL 2-5
2.7 RESTRICTIONS ON THE BUILDING OFFICIAL 2-6
2.8 DAMAGE SUIT 2-6
2.9 POWERS AND DUTIES OF THE BUILDING OFFICIAL 2-6
2-6
2.9.1 General 2-7
2.9.2 Deputies 2-7
2.9.3 Application and Permits 2-7
2.9.4 Building Notices and Orders 2-7
2.9.5 Right of Entry 2-8
2.9.6 Inspection 2-8
2.9.7 Orders to Stop Work 2-8
2.9.8 Unlawful Continuance 2-8
2.9.9 Occupancy Violation 2-8
2.9.10 Maintenance of Records 2-8
2.9.11 Expert Opinion 2-8
2.10 APPEALATE AUTHORITY
2.11 REQUIREMENT OF CERTIFICATION OF WORK Vol. 1
2.12 LIMITS OF PROFESSIONAL CONDUCT
2.13 VIOLATION AND PENALTIES
2.13.1 General
2-i
Part 2
Administration and Enforcement
2.13.2 Professional Violation 2-9
2.13.3 Obligation of Offender 2-9
2.13.4 Conviction No Bar to Further Prosecution 2-9
2-9
2.14 POWER TO MAKE RULES
2-11
Chapter 3 PERMIT AND INSPECTIONS 2-11
2-11
3.1 PERMITS 2-12
3.2 TYPES OF PERMIT 2-12
2-12
3.2.1 Validity of Permits from the Date of Issuance 2-13
3.2.2 Permits Obtained Prior to Adoption of Code 2-13
3.3 CONSTITUTION OF BUILDING PERMIT COMMITTEES 2-14
3.4 APPLICATION FOR PERMIT 2-14
3.5 DISPOSAL OF APPLICATION
3.6 PREPARATION AND SIGNING OF DRAWINGS 2-14
3.7 FEES 2-15
3.8 RESPONSIBILITIES AND DUTIES OF THE OWNER 2-15
BNBC 2015 FINAL DRAFT 2-15
3.8.1 General 2-15
3.8.2 Employment of Technical Personnel 2-15
3.8.3 Right of Entry 2-15
3.8.4 Permits from Other Agencies 2-15
3.8.5 Information on Progressive Work 2-15
3.8.6 Safety Measures 2-16
3.8.7 Notice of Completion 2-16
3.8.8 Documents at Site 2-16
3.9 RESPONSIBILITIES AND DUTIES OF TECHNICAL PERSONNEL 2-16
3.10 INSPECTION 2-16
3.11 UNSAFE BUILDINGS 2-16
3.11.1 General 2-16
3.11.2 Examination 2-16
3.11.3 Notification 2-17
3.11.4 Disregard of Notice 2-17
3.11.5 Cases of Emergency 2-17
3.12 DEMOLITION OF BUILDINGS 2-17
3.13 VALIDITY OF THIS CODE 2-18
3.13.1 Partial Invalidity 2-18
3.13.2 Invalidity of Existing Buildings 2-19
3.14 ARCHITECTURAL AND ENVIRONMENTAL CONTROL 2-21
3.15 MAKING IMPLEMENTATION PROCEDURES 2-23
3.16 LIST OF RELATED APPENDICES 2-25
Appendix A Form for Land Use/Development/Building Permit 2-27
Appendix B Form for Certificate of Supervision 2-29
Appendix C Form for Sanction or Refusal of Land Use/Development/Building Permit
Appendix D Form for Appeal against Refusal of any Permit Vol. 1
Appendix E Form for Completion Certificate
Appendix F Form for Occupancy Certificate
2-ii
Chapter 1
PURPOSE AND APPLICABILITY
1.1 PURPOSE
The purpose of this Part is to relate the provisions of the Code to different documents for administration and
enforcement of the Code. All legal issues shall be referred to the Building Construction Act.
1.2 TERMINOLOGY
ALTERATION Any change, addition or modification in construction such as structural, dimensional, or any
removal of any part of a building or any change to or closing of any required means of
ingress or egress or a change to the fixtures or equipment or any change in occupancy or
use.
BNBC 2015 FINAL DRAFT
APPLICANT A person, a firm, a company, a corporation, or a government, semi-government or non-
government agency who intends to undertake any work regulated by this Code and who
has filed an application to the Building Official for this purpose in a form prescribed in the
Code.
APPROVED PLAN The set of plans, designs and specification of a building submitted to the Authority as per
provision of this Code and duly approved and sanctioned by the Authority.
AUTHORIZED Same as Building Official.
OFFICER
BUILDING A person who is the jurisdictional administrator of Building Code appointed by the
OFFICIAL Bangladesh Building Regulatory Authority (BBRA).
BUILDER A person, a firm, a company, a corporation or a government, semi-government or non-
government agency who undertakes construction of any work regulated by the Code.
Owner of a building or structure in connection to which the work is undertaken shall not be
considered as a Builder.
CONSTRUCT, TO To construct a new building or reconstruct an existing building or to convert a building from
one category of occupancy to another.
DEVELOPMENT Carrying out construction of buildings, engineering, mining or other operations in, or over
or under land or water; includes re-development, setting of layout and subdivision of any
land. 'To develop' and other grammatical variations shall be interpreted accordingly.
ERECT, TO See CONSTRUCT, TO.
OWNER (OF A The person, organization or agency at whose expenses the building is constructed and who
BUILDING) has the legal right over the land on which it is constructed or one who has the right to
transfer the same and includes his or her heirs, assignees and legal representatives, and a
mortgagee in possession.
PERMIT A written document or certificate issued by the Authority for carrying out a specific activity
under the provisions of this Code.
UNSAFE A building which, in the opinion of the Building Official, is structurally unsafe, or insanitary,
BUILDING or lacks proper means of ingress or egress, or which constitutes a hazard to life or property.
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1.3 APPLICABILITY
The requirements of this Code shall be complied within any construction, addition, alteration or repair, use and
occupancy, location, maintenance, demolition and removal of a building or structure or any appurtenances
connected or attached to it as set forth herein below.
1.3.1 Construction
For construction of a new building, the provisions of this Code shall apply to its design and construction.
1.3.2 Removal
For removal of any portion or the whole of a building, the provisions of this Code shall apply to all parts of the
building whether removed or not.
1.3.3 Demolition
For dismantling or demolition of any part or the whole of a building, the provisions of this Code shall apply to
any remaining portion and to the work involved in the dismantling or demolition process.
1.3.4 Alteration
For alteration of a building, the provisions of this Code shall apply to the whole building whether existing or
new. If the portion of the building to which the alteration is made is completely self contained with respect to
the facilities and safety measures required by this Code, the provisions of this Code shall apply only to that
portion and not to the whole building.
1.3.5 Maintenance
Maintenance work shall be undertaken for all new and existing buildings and all parts thereof to continue their
compliance with the provisions of this Code. All devices, equipment and safeguards installed as per the
requirements of this Code shall be maintained in conformity with the edition of the Code under which installed.
The owner of the building or his designated agent shall at all times be responsible for the safe and sanitary
maintenance of the building or structure, its means of egress facilities and the safety devices, equipment and
services installed therein. The Authorized Officer or his delegated persons as described in relevant documents
mentioned in Chapter 2 may cause re-inspection of a building to determine its continued compliance with this
Section.
1.3.6 Repair
Application or notice to the Authority administering the Code is not necessary for ordinary repairs to buildings
or structures, provided such repairs do not involve the cutting away of any wall or portion thereof, the removal
or cutting of any structural or bearing element, the removal or alteration of any required means of egress, or
the rearrangement of any parts of a structure affecting the access and exit facilities. All works involving addition
to, alteration or change of use of any building or structure shall conform to the requirements set forth in Part 9
of this Code.
1.3.7 Land Development
For development of a land for construction of a building, the provisions of this Code shall apply to the entire
development work. For land development purposes the following laws shall also be applicable:
(a) Building Construction Act 1952
(b) Private Residential Land Development Rules 2004
(c) Natural Water Body Protection and Preservation of Open space and Playground Act 2000.
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ORGANIZATION AND ENFORCEMENT
2.1 CODE ENFORCEMENT AGENCY
2.1.1 Establishment of Authority
The Government shall establish a new Authority responsible for enforcement of this Code throughout
Bangladesh. The Code enforcing agency shall have the authority of the government and shall herein be referred
to as the Bangladesh Building Regulatory Authority (BBRA). This Authority shall work as apex body to implement
the provisions of the Bangladesh National Building Code (BNBC) and will be administered under the Ministry of
Housing and Public Works, Government of Bangladesh.
2.1.2 Office of the Authority
Central Headquarters of BBRA will be located in Dhaka.
2.1.3 Constitution of Authority
Authority shall consist of 5 (five) members headed by Chairman, and the Government shall appoint them for
3(three) years. Among the members there will be one civil engineer as specified in Sec 2.1.5(a), one architect as
specified in Sec 2.1.5(b), one planner as specified in Sec 2.1.5(c), one lawyer as specified in Sec 2.1.5(d) and one
from Civil service as specified in Sec 2.1.5(e). Government will appoint one of them as the Chairman of the
Authority, who shall be either an architect or a civil engineer having professional experience of minimum 30
years in (i) design/construction and/or (ii) teaching/research, related to building. The Authority shall appoint
such numbers of officers, technical assistants, inspectors and other employees as shall be required for proper
administration of the Code and smooth functioning of the Authority.
2.1.4 Responsibilities of the Authority
Bangladesh Building Regulatory Authority (BBRA) shall:
(a) be the organization responsible for establishing regulatory framework for building design and
construction with efficient and effective compliance mechanism.
(b) develop building check and control procedure for ensuring high degree of regulatory compliance in
planning and the Code requirements and reduce information asymmetry between the end user
(building occupant, home owner) and seller (developers, builders).
(c) streamline and improve transparency through dissemination of information related to built
environment including detail land use plan, regulations on safety, water and environmental
conservation, health, energy efficiency and urban planning requirements through print and digital
media including its website.
(d) develop an effective licensing system, jointly with the professional bodies by forming a National Council
for Licensing of Building Professionals (NCLBP) for conducting examinations for the members of those
respective professional bodies.
(e) update the requirements of building permit and inspection procedure as per Bangladesh National
Building Code.
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(f) require the owner of an existing or under construction high risk building, having major impacts on
public safety for inhabitants within and near the building, to carry out review of design and construction
by licensed professionals acceptable to the Authority.
(g) introduce IT based automated procedure for permits and online information system to enable the
applicants to track the progress of the permitting process.
(h) establish an independent quasi-judicial dispute-resolution body that can make binding decisions in
disputes between practitioners, developers, stakeholders and permitting authorities on matters related
to interpretation of the Code or sufficiency of compliance, which cannot be appealed except to the
Supreme Court on matters of law .
(i) recommend punitive and other measures against developers and professionals for violation of the
Code and safety measures.
(j) take measures for updating of the Code in light of research, improved building design and construction
technique, availability of new products and technology.
(k) advise the Government on policy and administration of building regulations including capacity
development.
(l) take up matters from time to time which the Authority deems necessary.
2.1.5 Qualifications of Members of the Authority
A Member shall be a person who is a/an;
(a) civil engineer having professional experience of 30 years in design / construction / teaching / research,
related to building.
(b) architect having professional experience of 30 years in design / construction / teaching / research,
related to building.
(c) planner having professional experience of 30 years in planning / teaching / research, related to building.
(d) judge having professional experience of 30 years in law including the qualification for appointment of a
judge of the High Court Division.
(e) person having professional experience of 30 years in Bangladesh Civil Service.
2.2 ENFORCEMENT AT FIELD LEVEL
2.2.1 The Bangladesh Building Regulatory Authority will designate specific geographical jurisdiction as
subordinate office of BBRA which will be named as Office of the Building Official (OBO). OBO will be established
at various local/regional development area or local government levels.
2.2.2 These Offices of Building Official will have necessary number of officers, technical assistants, inspectors,
and other employees as shall be required for proper implementation and administration of the provisions of the
Code. All the officers and staff of these field offices shall be under administrative control of BBRA. They will be in
the pay-roll of the office they will be serving and will be treated as on deputation to BBRA.
2.3 BUILDING OFFICIAL
2.3.1 The administrative and operational chief of the Code enforcing office shall be designated as the Building
Official who shall act on behalf of the Authority. The Building Official may designate an employee or employees
who shall carry out the specified duty and exercise the specified power of the Building Official.
2.3.2 Building Official shall exercise through a Building Construction Committee (BC Committee) comprising
four members excluding Building Official. Such committee shall be formed in combination of one architect, one
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civil engineer, one town planner and representative from concerned body. Building Official shall work as ex-
officio member-secretary of the Committee.
2.4 ADMINISTRATIVE JURISDICTION OF BUILDING OFFICIALS
2.4.1 The areas delineated below in Table 2.2.1 shall be under the jurisdiction of the Building Officials located
in the offices/authorities mentioned in the right hand column:
Table 2.2.1: Jurisdiction of Building Officials of Designated Offices/Authorities
Sl. Area Authority
1 Areas falling under the master plan control of Rajdhani RAJUK
Unnayan Kartipokhkha (RAJUK)
2 Areas falling under the master plan control of Chittagong CDA
Development Authority (CDA)
3 Areas falling under the master plan control of Rajshahi RDA
Development Authority (RDA)
BNBC 2015 FINAL DRAFT4 Areas falling under the master plan control of KhulnaKDA
Development Authority (KDA)
5 Areas falling under the master plan control of any relevant development authority
Development Authority to be established in future
6 Areas falling under the geographical jurisdiction of any City relevant city corporation
Corporation where no Development Authority exists
7 Areas falling under the geographical jurisdiction of any Relevant municipality
Municipality where no Development Authority exists
8 Areas not falling under any of the above Office of The Executive Engineer Public Works
9 Special areas, if any Department (PWD).
To be declared by the government as and when
necessary
2.4.2 There may be as many Building Officials as required depending upon the area of jurisdiction. But every
Building Official will be in charge of an independent and well demarcated area.
2.5 MERGING THE JURISDICTIONS UNDER SMALL LOCAL BODIES
Small local bodies like Pourashavas/Upazila/Union Parishad located outside the larger city municipalities and
having insufficient funds for individually carrying out the task of the Code enforcing agency may jointly appoint
or designate, with the approval of the Authority, a Building Official who shall have a jurisdiction over the
combined area of jurisdiction of the concerned local bodies.
2.6 QUALIFICATIONS OF THE BUILDING OFFICIAL
The person to be designated as the Building Official shall be at least an architect, civil engineer, or town planner
in addition to fulfilling any other requirement of the Authority. The employees of the Building Official shall be
adequately qualified to carry out the responsibilities assigned to them by the Building Official.
2.7 RESTRICTIONS ON THE BUILDING OFFICIAL
The Building Official or any of his employees shall not in any way, directly or indirectly, be engaged in planning,
design, construction, repair, maintenance, modification or alteration of a building, certification of any work or
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materials, supply of materials, labor, equipment or appliances or any other work regulated by the provisions of
this Code. The Building Official or any of his employees shall not be interested in business, either directly or
indirectly, as planner, engineer, architect, builder or supplier or in any other private business transaction or
activity within the jurisdiction of the Authority which conflicts with his official duties or with the interest of the
Code enforcing agency. If any Building Official or any of his employees violates the restrictions, he shall be liable
to punishment as per service rule of the government.
2.8 DAMAGE SUIT
In the process of discharging the official duties as required and permitted by the Code, the Building Official or
any of his employees shall not be personally liable for any damage that may be caused to any person or
property. Any suit filed against the Building Official or any of his employees because of an act performed by him
in the official discharge of his duties and under the provisions of the Code shall be defended by the legal
representative of the Authority until the final decision of the proceedings. In no case shall the Building Official or
any of his employees be liable for costs in any legal action, suit, or defense proceedings that may be filed in
pursuance of the provisions of the Code.
2.9 POWERS AND DUTIES OF THE BUILDING OFFICIAL
2.9.1 General
The Building Official shall be authorized to enforce all the provisions of this Code and for such purposes the
Building Official shall have the power of a law enforcing officer.
The Building Official shall be authorized to interpret this Code and to adopt and enforce rules and supplemental
regulations in order to clarify the application of its provisions in conformity with the intent and purpose of this
Code.
2.9.2 Deputies
The Building Official may appoint such number of technical officers and inspectors and other employees as shall
be authorized from time to time in accordance with the prescribed procedures and with the approval of the
Authority. The Building Official may designate such officers or inspectors as may be necessary to carry out the
functions of the Code enforcement agency.
2.9.3 Application and Permits
Applications shall be made in writing to the Building Official for any erection, construction, addition, alteration,
modification, repair, improvement, removal, conversion, change of occupancy, and demolition of any building
or structure regulated by this Code. The Building Official shall receive such applications, examine the premises,
enforce compliance with this Code and issue permits for the intended work.
2.9.4 Building Notices and Orders
All necessary notices and orders to correct illegal or unsafe conditions, to require the specified safeguards
during construction, to require adequate access and exit facilities in existing buildings and to ensure compliance
with all the requirements of safety, health and general welfare of the public as included in this Code shall be
issued by the Building Official.
2.9.5 Right of Entry
The Building Official may enter a building or premises at reasonable times to inspect or to perform the duties
imposed by this Code if:
(a) it is necessary to make an inspection to enforce the provisions of this Code; or
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(b) the Building Official has reasonable cause to believe that a condition contrary to or in violation of thisBNBC 2015 FINAL DRAFT
Code exists making the building or the premises unsafe, hazardous or dangerous.
If the building or premises is occupied, the Building Official shall present credentials to the occupant and request
entry. If the building or premises is unoccupied, the Building Official shall first make a reasonable effort to locate
the owner or any other person having charge or control of the building or premises and request entry. If entry
into the building or premises is refused or the owner of the unoccupied building or premises cannot be located,
the Building Official shall secure entry as provided by the law.
2.9.6 Inspection
The Building Official or his designated deputies shall inspect all construction or work for which a permit is
required or he may accept reports of inspection by a licensed engineer, architect or planner provided he
satisfies the requirements of Table 2.3.4 and may disapprove the report showing specific reason for disapproval.
The work or construction to be inspected shall remain accessible and exposed for inspection purposes until the
approval is obtained.
All reports of inspection shall be in writing and certified by the Building Official or the licensed engineer or the
architect making the inspection.
Approval of work or construction as a result of such inspection shall not be interpreted to be an approval of a
violation of the provisions of this Code or of other ordinances of the jurisdiction.
The Building Official may require survey of the site and adjoining areas to verify that the structure is located in
accordance with the approved plans.
The Building Official or his designated deputies shall carry proper identification when inspecting structure or
premises in the performance of duties under the provision of this Code.
2.9.7 Orders to Stop Work
The Building Official may issue an order for immediate discontinuation of a work and cancellation of a previous
permit for such work at any stage if:
(a) any work is being done contrary to the provision of this Code or other pertinent laws or ordinances
implemented through the enforcement of this Code; or
(b) it is determined by the Building Official that the construction is not proceeding according to the
approved plan, dangerous or unsafe.
In such cases the Building Official shall notify the owner in writing of such an order by showing the reason for
the order, and the conditions under which the cited work will be permitted to resume.
When there is insufficient evidence of compliance with the provisions of this Code, a Building Official shall have
the authority to require test as evidence of compliance to be made at no expense to the office of the Building
Officials. Test shall be performed by an agency approved by BO.
2.9.8 Unlawful Continuance
Any person who shall continue any work after having been served with a stop work order, except such work as
that person is directed to perform to remove a violation or unsafe condition, shall be subject to penalties as
prescribed by law.
2.9.9 Occupancy Violation
The Building Official may order the current uses of a building discontinued and the building or portion thereof
vacated by serving a notice on any person if the Building Official determines that the building or structure or
equipment therein regulated by this Code is being used contrary to the provisions of this Code. Such person
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shall discontinue the use within the time prescribed by the Building Official after receipt of such notice to make
the structure, or portion thereof, comply with the requirements of this Code.
2.9.10 Maintenance of Records
The Building Official shall maintain records of all applications and drawings received, permits and orders issued,
inspections made and reports prepared and submitted by other recognized agencies. Copies of all relevant
papers and documents for enforcement of the Code shall be preserved by the Building Official. All such records
shall be kept open to public inspection at all suitable times.
2.9.11 Expert Opinion
The Building Official may engage, subject to the approval of the Authority, an expert or a panel of experts for
opinion on unusual technical issues that may arise in administering the provisions of the Code.
2.10 BOARD OF APPEAL
There shall be a Board of Appeal to hear and decide appeals of orders, decisions or determinations made by the
Building Official related to the application and interpretation of this Code. Board of Appeal shall be constituted
by BBRA as per the provisions of Sec 2.1.4. The Board shall provide reasonable interpretation of the provisions
of this Code and determine the suitability of alternative materials or methods of design or construction. Such
Board shall consist of members appointed by the Authority who are noted for their education and experience in
the relevant field of building construction and whose term of office shall be as decided by the BBRA. This Board
shall, with the approval of the government, adopt rules of procedure for conducting its business, and shall
communicate all decisions and findings in writing to the Appellant with a copy to the Building Official.
This Board shall have no discretion for interpretation of the administrative provisions contained in Part 2 of this
Code, nor shall be empowered to waive any requirement of this Code.
2.11 REQUIREMENT OF CERTIFICATION OF WORK
Any planning, design, supervision of construction, repair, maintenance, modification and alteration of buildings,
or any other work regulated by the Code shall be certified by a licensed engineer, architect or planner for its
compliance with the provisions of the Code as per Tables 2.3.3 and 2.3.4.
2.12 LIMITS OF PROFESSIONAL CONDUCT
Any licensed architect, engineer or planner may take assistance from fellow professionals who are not licensed
but is member of professional bodies and who shall work under his direct control. He shall be allowed to plan,
design and supervise construction, repair, maintenance, alteration and modification of buildings or structures
regulated by this Code provided the licensed professional certify compliance of the work with the provisions of
the Code. In case of any violation of the Code the licensed professionals who shall certify will be liable for action
through professional bodies. Such a person may provide any such certificate as long as his or her services are
recognized by the Building Official and such recognition is not withdrawn under the provisions of Sec 2.13.2.
2.13 VIOLATION AND PENALTIES
2.13.1 General (Unlawful Acts)
Any person, firm, corporation or government department or agency who as owner of the property erects,
constructs, enlarges, alters, repairs, moves, improves, removes, converts, demolishes, equips, uses, occupies or
maintains any building or structure or cause or permit the same to be done in violation of this Code shall be
guilty of an offence and the Authority shall take legal action against such offenders as prescribed by law. The
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term owner shall, for the purpose of these provisions include any developer who by appointment, contract or
lease is or has been responsible for the actions listed above.
2.13.2 Professional Violation
The engineer, architect or planner responsible for design, supervision or certification of any construction or
other work of a building or structure shall ensure compliance of such work with the provisions of this Code. Any
violation of the Code or any other professional misconduct insofar as implementation of the provisions of this
Code is concerned including making false statements or issuing false certificates or any incidence of proven
professional incapability shall be recommend to the respective professional bodies for necessary disciplinary
measure including withdrawal of recognition/registration.
2.13.3 Obligation of Offender
A person shall not be relieved from the duty of carrying out the requirements or obligations imposed on him or
her by virtue of the provisions of this Code even if such person is convicted for an offence under the provisions
of this Section.
2.13.4 Conviction No Bar to Further Prosecution
If a person is convicted under the provisions of this Code for failing to comply with any of its requirements or
obligations such conviction shall not act as a bar for further prosecution for any subsequent failure on the part
of such person to comply.
2.14 POWER TO MAKE RULES
The Authority may make rules for carrying out the provisions and intentions of this Code. Such rules shall not
contradict nor nullify any of the provisions of this Code. The Authority may fix and re-fix from time to time
application fees for issuance of permits for all works under the provisions of this Code.
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Chapter 3
PERMITS AND INSPECTIONS
3.1 PERMITS
No building or structure regulated by this Code shall be erected, constructed, enlarged, altered, repaired, moved,
improved, removed, converted or demolished without obtaining permit for each such work from the Building
official.
Exceptions:
The following works are exempted from the requirement of a permit unless they do not otherwise violate the
provisions of this Code, for the said work or any other adjacent property, regarding general building requirements,
structural stability and fire safety requirements of this Code:
(a) Opening or closing of a window or a door or a ventilator;
(b) Providing internal doors;
(c) Providing partitions;
(d) Providing false ceiling;
(e) Gardening;
(f) Painting;
(g) Plastering and patch work;
(h) Re-flooring;
(i) Construction of sunshades on one's own land;
(j) Re-erection of portion of buildings damaged by earthquake or cyclone or other natural calamities, to the
extent and specification as existed prior to such damage; and
(k) Solid boundary walls less than 1.5 m and open boundary wall less than 2.75 m in height.
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3.2 TYPES OF PERMIT
Building permit shall comprise of the following 4(four) stages:
(a) Land use certificate
(b) Large and specialized project permit.
(c) Building permit
(d) Occupancy certificate.
Permit of all or any of the above may be necessary for a particular area/city/town/municipality. Requirement in
this regard shall be incorporated in the building construction byelaws/ rules/regulations valid for that particular
area/city/town/municipality.
Validity of Permits from the Date of Issuance
The validity of permits for different purposes from the date of issuance shall be as follows:
(a) Land use certificate 24 months
(b) Large and specialized project permit 24 months
(c) Building permit 36 months (unless construction up-to plinth level is done)
(d) Occupation certificate Perpetual (unless any change in use and physical properties)
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Permits Obtained Prior to Adoption of Code
If permit for a building or structure or a work regulated by this Code is obtained before adoption of this Code and
the building or structure or work for which the permit is obtained is not completed within three years from the
date of issuance of such permit, the said permit shall be deemed to have lapsed and fresh permit shall be
necessary to proceed further with the work in accordance with the provisions of this Code.
3.3 CONSTITUTION OF BUILDING PERMIT COMMITTEES
As per the provisions laid out in the Building Construction Act the government may constitute various
committees to examine and scrutinize applications mentioned in Clause 3.2 above and approve or refuse permits
thereby.
Each committee will have specific Terms of Reference and Work Procedure.
3.4 APPLICATION FOR PERMIT
BNBC 2015 FINAL DRAFT
Any person who intends to undertake any work on a building or structure or land regulated by this Code
shall file application in writing on the prescribed form furnished by the Building official for that purpose.
Application for permit for any work under the provisions of this Code shall be accompanied by necessary
documents, drawings, certificates, clearances and other relevant information as required by the Building Official
for that particular city/town/municipality/jurisdiction area etc.
The drawings shall have any of the sizes specified in the Table 2.3.1:
Table 2.3.1: Drawing Sizes for Permit Applications Size (mm)
Notation (ISO Standard) 841 x 1189
A0
A 1 594 x 841
A 2 420 x 594
A 3 297 x 420
A 4 210 x 297
Operation and Maintenance of Utility Services
The government may undertake works for operation, maintenance, development or execution of any of the
following utility services without requiring obtaining permit from the Building Official.
(a) Railways
(b) National Highways
(c) National Waterways
(d) National Gas grid
(e) National Power grid
(f) Major Ports
(g) Airways and Aerodromes
(h) Telecommunications
(i) Electronic Broadcasting Services
(j) Any other services which the Government may, by notification, declare to be a service for the
purpose of this Section if the Government is of the opinion that the operation, maintenance,
development or execution of such service is essential to the community.
Buildings constructed in connection with these services shall conform to the specifications of this Code.
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3.5 DISPOSAL OF APPLICATION
Subject to the submission of correct and complete application for the permits included in Sec 3.2 above,
should be disposed by the Building Official within the time limit as shown in Table 2.3.2:
Table 2.3.2: Time Limit for Disposal of Application for Permits
Type of Permit Maximum type allowed for disposal (approval
or refusal of the Building official)
Land use certificate 15 days
Large and Specialized Project permit 45 days
Building permit 45 days
Occupancy certificate 15 days
The Building Official shall notify the applicant according to above table as the case may be either approval
or refusal of the permit for any work. If the Building Official does not notify the applicant of such approval or
refusal within this specified period, the application shall be deemed to have been approved provided the fact is
brought to the notice of the Building Official. Such approval shall not be interpreted to authorize any person to
do anything in contravention of or against the terms of lease or titles of the land or against any other regulations,
bylaws or ordinance operating on the site of the work or any of the provisions of this Code.
Refusal of permit shall be accompanied with reason and the Building Official shall quote the relevant
sections of this Code which the application/drawings/submissions contravene. The applicant may correct or
remove such reasons and reapply for permit with any fee if applicable. The Building Official shall scrutinize the re-
submitted application and if there be no further objection it shall be approved and permit issued.
BNBC 2015 FINAL DRAFT
3.6 PREPARATION AND SIGNING OF DRAWINGS
All drawings submitted for approval shall be prepared and signed by registered professionals as specified
in Table 2.3.4, which shall be considered as equivalent to certifying that the drawing on which the signature
appears conforms to all the requirements of this Code. Registered Professionals shall put his or her signature with
date on the title box of the drawing along with his name, address, professional society membership number,
registration number and any other information required by the concerned Building Official.
The drawings shall also contain the signature, name and address of the owner.
Subject to the classification and use of buildings, all drawings for approval and execution shall be
prepared and signed by the registered professionals as per building category specified in Tables 2.3.3 and 2.3.4
corresponding to relevant work.
Table 2.3.3: Building classification based on height, floor area and occupancy type
Building Height of Building Floor Area Type of Occupancy
Category Up to 250 m2 A (A1-A2)
I Up to 2 Stories or 8 m height (without basement) applicable only for
areas beyond the jurisdiction of Development authority, city
corporation and pourashava
II Up to 5 Stories Up to 1000 m2 A (A1-A5)
III Up to 10 stories or 33 m height for engineering design and supervision Up to 7500 m2 A, B, C, E1, E2, F1, F2
and any height for land survey, sub-soil investigation and architectural and H1
design
IV Any height Any Size All Occupancy Type
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Table 2.3.4: Eligible registered professionals for signing Design Drawings/Documents
Types of Work Registered Professional Minimum Experience Requirement in Years for
Building category
I II III IV
Land Survey Civil Engineer NA NR NR NR
Planner NR NR NR
Diploma Engineer (Civil) 33 3
Certified Surveyor 33 3
Soil Investigation Geotechnical Engineer having experience in NA NR NR NR
Report soil investigation and soil test report
analysis.
Civil Engineer having experience in soil NA 2 2 5
investigation and soil test report analysis.
Architectural Design Architect NA NR 2 8
Civil Engineer NA NR NE NE
Diploma Architect NA 5 NE NE
Structural Design Civil Engineer with experience in structural NA 2 4 8 (having 5 years in
design or PEng.BNBC 2015 FINAL DRAFT Structural design)
Civil Engineer with M.S in Structural NA 1 3 8 (having 4 years in
Engineering. Structural design)
Plumbing Design Plumbing Engineer NA NR 4 8
Architect NA NR NE
Diploma Engineer (Civil) NA 3 NE NE
Mechanical Mechanical Engineer NA 2 4 8
(HVAC/Vertical
Transportation)
Design
Electrical Design Electrical Engineer. NA 2 4 8
Diploma Engineer (Electrical) NA 3 NE NE
Construction Architect/Engineer in their respective field NA 2 4 8
Supervision
or PEng.
Diploma Architect/Diploma Engineer in their NA 2 4 NE
respective field.
Building Demolition Civil Engineer NA NR 2 8
Diploma Engineer (Civil) NA 2 NE NE
Completion Report Architect and Engineer with experience in NA 2 4 8
their respective field.
Note: NA: Not Applicable, NE: Not Eligible, NR: Not Required
3.7 FEES
All applications shall be accompanied by fees as specified by the authority from time to time without which the
application shall be deemed to be incomplete.
3.8 RESPONSIBILITIES AND DUTIES OF THE OWNER
General
The owner of a building or structure regulated by the provisions of this Code shall be responsible for carrying out
the work in conformity with the provisions of this Code. Granting of permission for any work or approval of plans
or inspection by the Building Official or any of the deputies shall not relieve the owner from such responsibility.
2-14 Vol. 1
Permits and Inspections Chapter 3
Employment of Technical PersonnelBNBC 2015 FINAL DRAFT
Design, execution and supervision work of any building shall be carried out by authorized Registered Professionals
as outlined in Table 2.3.4. Owner shall take the services of as many professionals as required according to type
and size of the work.
Right of Entry
The owner shall allow the Building Officials to enter the site for the purpose of enforcing the Code as required by
the provision of Sec 2.9.6 and for the purpose of inspection as provided in Section 3.10 below.
Permits from Other Agencies
The owner shall obtain permit as may be applicable from other concerned agencies relating to building, zoning,
grades, sewers, water mains, plumbing, fire safety, signs, blasting, street occupancy, gas, electricity, highways and
all other permits required in connection with the proposed work.
Information on Progressive Work
The owner shall inform the Building Official about attainment of construction work of different stages as required
by the Building Official in prescribed form.
Safety Measures
The owner shall take proper safety measures in and around the construction site.
Notice of Completion
The owner shall notify the Building Official the completion of the work for which permit was granted in prescribed
form. The work shall not be accepted as complete, without a certification from the Building Official.
Documents at Site
The owner shall preserve at the site a copy of all permits issued and all drawings approved by the Building Official.
Results of tests carried out for determination of conformity of the work with the provisions of this Code shall also
be preserved and made available for inspection during execution of the work.
Live Load Posted
Where the live loads for which each floor or portion thereof of a commercial or industrial building is or has been
designed to exceed 2.4 kN/m2, such design live loads shall be conspicuously posted by the owner in that part of
each storey in which they apply, using durable signs. It shall be unlawful to remove or deface such notices.
3.9 RESPONSIBILITIES AND DUTIES OF TECHNICAL PERSONNEL
To qualify as Architect, Engineer, Supervisor of any building works one shall have membership of the
respective professional body in the country. In addition they shall have to qualify as registered professional
through an examination (written/oral) to be conducted by their respective professional body as per requirement
of this Code.
Only technical professionals qualified under Sec 3.9.1 shall design, execute and supervise any building
which is subjected to approval granted under this Code.
Any lapses on the part of the technical personnel in delivering the requirements of the Code shall call for
punitive actions against him/her in the proper forum.
Bangladesh National Building Code 2015 2-15
BNBC 2015 FINAL DRAFTPart 2
Administration and Enforcement
3.10 INSPECTION
All works relating to a building or structure regulated by the provisions of this Code for which permits are required
shall be subject to inspection by the Building Official. Modalities and frequency of such inspections shall conform
to the requirements put forward by the approving authority.
3.11 UNSAFE BUILDINGS
General
All buildings considered to constitute danger to public safety or property shall be declared unsafe and shall be
repaired or demolished as directed by the Building Official.
Examination
The Building Official shall examine or cause examination of every building reported to pose threat to safety or be
damaged by wear and tear or accident and shall make a written record of such examination.
Notification
If a building is found to be unsafe the Building Official shall notify the owner of the building and specify the defects
thereof. The notice shall require the owner within a stated time either to complete the required repair or
improvement or demolish and remove the building or portion thereof.
Disregard of Notice
In case the owner fails, neglects or refuses to carry out the repair or improvement of an unsafe building or portion
thereof as specified in the notice, the Building Official shall cause the danger to be removed either by demolition
or repair of the building or portion thereof or otherwise, the cost of which shall be borne by the owner.
Cases of Emergency
If the Building Official considers that an unsafe building or structure constitute imminent danger to human life or
health or public property, the Building Official shall at once or with a notice as may be possible promptly cause
such building or structure or portion thereof to be rendered safe or removed. In such cases the decision of the
Building Official shall be final and binding and he or any of his assigned deputies may at once enter such structure
or land on which it stands or the abutting land or structure, with such assistance from and at such cost to the
owner as may be deemed necessary. The Building Official may also get the adjacent structures vacated and protect
the public by an appropriate fence or such other means as may be necessary.
3.12 DEMOLITION OF BUILDINGS
If a building or structure is to be demolished, the owner shall notify all agencies providing utility services to the
building. Such agencies shall remove all their appurtenances and equipment and dismantle all service connections
to ensure a safe condition. The Building Official shall not grant any permit for demolition of a building until a
release is obtained from the utility services stating that all service connections have been removed in the proper
manner. The demolition work shall be done under the supervision of demolition expert as per provisions of Table
2.3.4.
2-16 Vol. 1
Permits and Inspections Chapter 3
3.13 VALIDITY OF THIS CODE
3.13.1 Partial Invalidity
In case any provision of this Code is held to be illegal or void, this shall have no effect on the validity of any other
provision of the Code nor on the same provision in different cases nor on the Code as a whole, and they shall
remain effective.
3.13.2 Invalidity of Existing Buildings
If any provision of this Code is held to be illegal or void by the Authority as applied to an existing building or
structure, validity of that provision or any other provision of the Code in its application to buildings hereafter
erected shall not be affected.
3.14 ARCHITECTURAL AND ENVIRONMENTAL CONTROLBNBC 2015 FINAL DRAFT
Besides enforcing the provisions of this Code for normal buildings and structures, the Building Official
shall, for special structures such as those listed in Sec 3.14.2 below, also examine the aesthetics and
environmental issues vis-a-vis the existing structures and the characteristics of the area, and exercise architectural
and environmental control in accordance with the provisions of this Section.
Special structures for which architectural and environmental control shall be exerted by the Building
Official shall include:
(a) major public building complexes
(b) buildings in the vicinity of monuments and major sculptures
(c) buildings and structures near existing structures identified to be architecturally valuable.
(d) buildings and structures near historic buildings or in a area of historical or archaeological significance.
(e) buildings near any structures that represents the special characteristics of an area
(f) any proposed building or structure that represents the special characteristics or forms part of a larger
master plan of an area, and
(g) any development that may have an effect on or mar the environment or characteristics of an area.
The Authority shall, for the purpose of exercising the architectural and environmental control and for
identifying existing structures having architectural value, appoint a standing committee comprising noted experts
from the fields of Architecture, Archeology, Planning, History, Art, Literature, Engineering or any other discipline
which may be deemed relevant. The committee shall examine the aesthetic quality of the proposed building,
structure or development and the effect it may have on the characteristics and environment of the area in order
to ensure aesthetic continuance of the new structure with the existing ones and aesthetic blending of the new
structure with the surroundings. The committee may require additional drawings and information for a detailed
study of the proposed work. The committee for the purpose of arriving at their decision, may at their discretion
depending on the magnitude of the project and impact it may have on public life, hear the architect of the
proposed work who may wish to explain the various features of the project, note comments of other experts in
the relevant disciplines, or in exceptional circumstances, institute a public hearing to assess public reaction to the
project.
The committee may approve the proposed work, recommend changes in the scheme, or disapprove the
scheme, for reasons of aesthetics and environmental control.
The Building Official shall not issue permit for undertaking the proposed work until obtaining a report
from the standing committee stating that the intended work is acceptable in respect of its effect on the
Bangladesh National Building Code 2015 2-17
Part 2
Administration and Enforcement
environment, landscape, architectural characteristics, historical feature or any other aesthetical quality of the
locality, area or landscape concerned.
3.15 MAKING IMPLEMENTATION PROCEDURES
Detailed byelaws and implementation procedure to enforce the provisions of this Code shall be prepared and
published by the relevant authorities.
3.16 LIST OF RELATED APPENDICES
Appendix A Form for Application of Land Use/Development/Building Permit
Appendix B Form for Certificate of Supervision
Appendix C Form for Sanction or Refusal of Land Use/Development/Building Permit
Appendix D Form for Appeal against Refusal of any Permit
Appendix E BNBC 2015 FINAL DRAFTForm for Completion Certificate
Appendix F Form for Occupancy Certificate
2-18 Vol. 1
Appendix A
(Position and Address of the Building Official)
Form for Land Use/Development/Building Permit
First Application to Develop, Erect, Demolish or to Make
Alteration in any Part of the Building
Type of intended work: Develop Erect Demolish Alter
(Check one)
Name of the owner: __________________________________________________________________
Contact address: __________________________________________________________________
Post code: _________________________
Telephone no: _________________________
Name, address and qualification of the engineer, architect or planner involved in the proposed work:
For planning: ________________________________________________________
For architectural design: ________________________________________________________
For structural design: ________________________________________________________
For civil works design: ________________________________________________________
For other services design: _________________________________________________________
BNBC 2015 FINAL DRAFT
Address of the site
Plot number: _________________________ Holding number: _________________________
Dag/Khatian number: _________________ Mouza/Block/Sector: ____________________
Street name: _________________________ Municipal ward number: __________________
Documents enclosed along with this form:
Name of document Number of sheets Number of copies
1. Key plan _____ _____
2. Site plan _____ _____
3. Subdivision/layout plan _____ _____
_____ _____
4. Building plan _____ _____
5. Services plan _____ _____
6. Specifications _____ _____
7. Ownership title
_________________ _____________________________
Date Signature of the owner
For use of the Building Official. Do not write anything below this line.
Reference number: ___________________________ Date: __________________
(To be referred to in all subsequent correspondences)
Received by: ______________________________
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Administration and Enforcement
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2-20 Vol. 1
Appendix B
Form for Certificate of Supervision
Reference number: _________________________ Holding number: ___________________
Address of the site:
Plot number: _____________________________
Street name: _____________________________
Municipal ward number: ___________________
Type of intended work (Check one) :
Develop Erect Demolish Alter
Name of the owner:BNBC 2015 FINAL DRAFT______________________________________________________
Contact address: ______________________________________________________
______________________________________________________
Post code: ______________________________________________________
Telephone no: ____________________
____________________
I hereby certify that the building for which the location, the type of work, and the name and address of owner appear
above will be supervised by me as per the provisions of the Bangladesh National Building Code.
______________________________________________
Signature of the engineer, architect, planner or supervisor
__________________________________________
Name of the engineer, architect, planner or supervisor
_______
Address
___________ ________________
Qualification Date
Part 2 2-21
Administration and Enforcement
BNBC 2015 FINAL DRAFTPart 2
Administration and Enforcement
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2-22 Vol. 1
Appendix C
(Position and Address of the Building Official)
Form for Sanction or Refusal of Land Use/Development/Building Permit
Reference number: ___________________________
In response to your application whose reference number appears above, I hereby inform that the documents submitted
along with your application have been (check as appropriate)
Approved for implementation by the Authority
Refused by the Authority for violation of the following provisions of the Bangladesh National Building
Code:
(List of the sections violated)
----------------------------------------
----------------------------------------
----------------------------------------
----------------------------------------
----------------------------------------
BNBC 2015 FINAL DRAFT
________________________ ____________________________
Signature of the Officer Permit number
________________________ ____________________________
Name of the Officer Official stamp
________________________ ____________________________
Designation Date
Part 2 2-23
Administration and Enforcement
BNBC 2015 FINAL DRAFTPart 2
Administration and Enforcement
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2-24 Vol. 1
Appendix D
Form for Appeal against Refusal of any Permit
Reference number: ___________________________
The application whose reference number appears above has been refused by the Authority. I hereby appeal against the
refusal for the following reasons.
(List of the justifications for the appeal)
----------------------------------------
----------------------------------------
----------------------------------------
----------------------------------------
----------------------------------------
BNBC 2015 FINAL DRAFT
_________________ _____________________________
Date Signature of the owner
For use of the Building Official. Do not write anything below this line.
Received by: ______________________________
Date: __________________
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Administration and Enforcement
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Administration and Enforcement
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2-26 Vol. 1
Appendix E
Form for Completion Certificate
Reference number: ________________________
Permit number: __________________________
Address of the site:
Plot number: ____________________________ Holding number: _________________________
Dag/Khatian number: ____________________ Mouza/Block/Sector: ____________________
Street name: ____________________________ Municipal ward number: __________________
Documents enclosed along with this form:
______________________
______________________
Type of work (Check one)BNBC 2015 FINAL DRAFT
Develop Erect Demolish Alter
Name of the owner: ______________________________________________________
Contact address:
______________________________________________________
Post code: ______________________________________________________
Telephone No: ______________________________________________________
____________________
____________________
I hereby certify that the work having the above mentioned detailed particulars has been supervised by me and completed
in accordance with the plan and design approved by the permit number cited and the provisions of the Bangladesh
National Building Code.
__________________________________________________
Signature of the engineer, architect, planner or supervisor
________________________________________________
Name of the engineer, architect, planner or supervisor
________________________________________________
Address
________________________________________________ ________________________
Qualification Signature of the owner
_____________________ ________________________
Date Date
_________________________________________________________________________________________________________
This Part to be completed by the Building Official.
The work identified by the reference number and permit number at the top of the form is hereby accepted as complete in
accordance with the approved plan and design.
________________________
Signature of the Officer
________________________ _______________________
Name of the Officer Official stamp
________________________ _______________________
Designation Date
Part 2 2-27
Administration and Enforcement
BNBC 2015 FINAL DRAFTPart 2
Administration and Enforcement
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2-28 Vol. 1
Appendix F
(Position and Address of the Building Official)
Form for Occupancy Certificate
Reference number: ________________________
Permit number: __________________________
Address of the site :
Plot number: ____________________________ Holding number: _________________________
Dag/Khatian number: ____________________ Mouza/Block/Sector: ____________________
Street name: ____________________________ Municipal ward number: __________________
Documents enclosed along with this form:
______________________
______________________
BNBC 2015 FINAL DRAFT
Type of work (Check one)
Develop Erect Demolish Alter
Name of the owner: ______________________________________________________
Contact address:
______________________________________________________
Post code: ______________________________________________________
Telephone No: ______________________________________________________
____________________
____________________
I hereby certify that the work having the above mentioned detailed particulars has been completed in accordance with the
plan and design approved by the permit number cited and the provisions of the Bangladesh National Building Code. The
owner has submitted all the required documents for issuance of occupancy certificate. Thus, I, hereby, certify that the
holding may be occupied as _________________________________________________ (mention the occupancy type).
________________________ ____________________________
Signature of the Officer Official stamp
________________________ ____________________________
Name of the Officer Date
________________________
Designation
Part 2 2-29
Administration and Enforcement
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Administration and Enforcement
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2-30 Vol. 1
BNBC 2015 FINAL DRAFTPART 3
GENERAL
BUILDING
REQUIREMENTS,
CONTROL AND
REGULATION
PART 3
BNBC 2015 FINAL DRAFT Pages
Chapter 1 GENERAL BUILDING REQUIREMENTS
Chapter 2 3-1
Chapter 3 CLASSIFICATION OF BUILDINGS BASED ON OCCUPANCY 3-29
3-83
Chapter 4 CLASSIFICATION OF BUILDING CONSTRUCTION TYPE BASED ON
Appendices FIRE RESISTANCE 3-95
ENERGY EFFICIENCY AND SUSTAINABILITY 3-105
TABLE OF CONTENTS
PART 3 GENERAL BUILDING REQUIREMENTS, CONTROL AND REGULATION
Chapter 1 GENERAL BUILDING REQUIREMENTS
1.1 SCOPE 3-1
3-1
1.2 TERMINOLOGY 3-5
3-5
1.3 LAND USE CLASSIFICATION 3-7
3-7
1.4 OCCUPANCY AND CONSTRUCTION CLASSIFICATION OF BUILDINGS 3-7
3-7
1.5 REQUIREMENTS OF PLOTS 3-8
3-8
1.5.1 General Requirements 3-8
3-8
1.5.2 Clearance from Overhead Electric Lines 3-9
3-9
1.5.3 Road, Formation level and Plinth Levels 3-15
BNBC 2015 FINAL DRAFT 3-17
1.5.4 Boundary Wall 3-18
3-18
1.6 PLOT SIZES 3-18
3-18
1.7 MEANS OF ACCESS 3-18
3-18
1.7.1 Internal Access Road 3-19
3-19
1.7.2 Pedestrian Path or Walkway or Footpath 3-20
3-21
1.8 OPEN SPACES WITHIN A PLOT 3-21
3-21
1.9 GENERAL HEIGHT AND AREA LIMITATIONS 3-21
3-21
1.10 OFF STREET PARKING SPACES 3-21
3-22
1.11 STREET ENCROACHMENT 3-22
1.12 COMMUNITY OPEN SPACE AND AMENITIES Vol. 1
1.13 MINIMUM STANDARD OF A DWELLING
1.14 REQUIREMENTS OF PARTS OF BUILDINGS
1.14.1 Plinth and Formation Levels
1.14.2 Room Dimensions
1.14.3 Kitchen
1.14.4 Bathroom and Toilets
1.14.5 Stairways
1.14.6 Mezzanine Floor
1.14.7 Lofts
1.14.8 Cabins or Chambers
1.14.9 Store Room
1.14.10 Private Garage
1.14.11 Basement
1.14.12 Entrance to the Building
1.14.13 Roof Drainage
3-i
Part 3
General Building Requirements, Control and Regulation
1.14.14 ParapetBNBC 2015 FINAL DRAFT 3-22
1.14.15 Septic Tank 3-22
1.15 LANDSCAPING 3-22
1.16 DAMP-PROOFING AND WATERPROOFING OF FLOORS AND WALLS 3-22
1.17 EXISTING BUILDINGS 3-23
1.18 BUILDINGS AND PLACES OF HISTORICAL OR ARCHITECTURAL VALUE 3-23
1.19 VENTILATION, LIGHTING AND SANITATION 3-23
1.20 AIR-CONDITIONING AND HEATING 3-24
1.21 PROVISION OF LIFTS AND ESCALATORS 3-24
1.22 SOUND INSULATION 3-25
1.23 THERMAL INSULATION 3-25
1.24 LIGHTNING PROTECTION OF BUILDINGS 3-25
1.25 RAT PROOFING AND TERMITE PROOFING OF BUILDINGS 3-25
1.26 REQUIREMENTS FOR BUILDINGS IN FLOOD PRONE AND COASTAL REGIONS OF BANGLADESH 3-25
1.26.1 Flood Prone Areas 3-25
1.26.2 Surge Prone Areas 3-26
1.27 REQUIREMENTS FOR BUILDINGS IN OTHER DISASTER PRONE AREAS 3-27
1.28 SPECIAL PROVISION FOR STORAGE OF DANGEROUS GOODS AND THEIR CLASSIFICATION 3-27
1.29 LIST OF RELATED APPENDICES 3-28
Chapter 2 CLASSIFICATION OF BUILDINGS BASED ON OCCUPANCY
2.1 OCCUPANCY CLASSIFICATION 3-29
2.2 CHANGE OF USE 3-35
2.3 MIXED OCCUPANCY 3-35
2.4 GENERAL REQUIREMENTS OF ALL OCCUPANCIES 3-36
2.4.1 Location on Property 3-36
2.4.2 Allowable Floor Areas 3-37
2.4.3 Permitted Types of Construction 3-37
2.4.4 General provision for High-Rise Buildings 3-38
2.4.5 Helipads 3-38
2.4.6 Universal Accessibility 3-39
2.5 REQUIREMENTS FOR OCCUPANCY A - RESIDENTIAL BUILDINGS 3-39
2.5.1 Construction, Height and Allowable Area 3-39
2.5.2 Location on Property 3-39
2.5.3 Access and Exit Facilities and Egress System 3-39
2.5.4 Lighting and Ventilation 3-39
2.5.5 Sanitation 3-39
2.5.6 Minimum Dimension of Habitable and Non-habitable Rooms 3-39
2-ii Vol. 1
BNBC 2015 FINAL DRAFTPart 3 3-39
General Building Requirements, Control and Regulation 3-40
3-40
2.5.7 Fire Detection, Alarm, Evacuation and Extinguishment 3-40
2.5.8 Shaft and Exit Enclosure 3-40
2.6 REQUIREMENTS FOR OCCUPANCY B - EDUCATIONAL BUILDINGS 3-40
2.6.1 Construction, Height and Allowable area 3-40
2.6.2 Location on Property 3-40
2.6.3 Access and Exit facilities and Egress System 3-40
2.6.4 Lighting, Ventilation and Sanitation 3-40
2.6.5 Minimum Dimensions of Class Rooms, Common Toilets and Staircases 3-41
2.6.6 Shaft and Exit Enclosure 3-41
2.6.7 Fire Detection, Alarm, Evacuation and Extinguishment System 3-41
2.7 REQUIREMENTS FOR OCCUPANCY C - INSTITUTIONAL BUILDINGS 3-41
2.7.1 Construction, Height and Allowable Area 3-41
2.7.2 Location on Property 3-41
2.7.3 Access and Exit Facilities and Egress System 3-41
2.7.4 Lighting, Ventilation and Sanitation 3-41
2.7.5 Shaft and Enclosure 3-41
2.7.6 Fire Detection, Alarm, Evacuation and Extinguishment System 3-41
2.8 REQUIREMENTS FOR OCCUPANCY D–HEALTH CARE FACILITIES 3-41
2.8.1 Construction, Height and Allowable Area 3-41
2.8.2 Location on Property 3-41
2.8.3 Access and Exit Facilities and Egress System 3-42
2.8.4 Lighting, Ventilation and Sanitation 3-42
2.8.5 Shaft and Enclosure 3-42
2.8.6 Fire Detection, Alarm, Evacuation and Extinguishment System 3-42
2.9 REQUIREMENTS FOR OCCUPANCY E–BUSINESS 3-42
2.9.1 Construction, Height and Allowable Area 3-42
2.9.2 Location on Property 3-42
2.9.3 Access and Exit Facilities and Egress System 3-42
2.9.4 Lighting, Ventilation and Sanitation 3-42
2.9.5 Shaft and Enclosure 3-42
2.9.6 Fire Detection, Alarm, Evacuation and Extinguishment System 3-42
2.10 REQUIREMENTS FOR OCCUPANCY F–MERCANTILE BUILDINGS 3-42
2.10.1 Construction, Height and Allowable Area 3-42
2.10.2 Location on Property 3-43
2.10.3 Access and Exit Facilities and Emergency Escapes
2.10.4 Lighting, Ventilation and Sanitation Vol. 1
2.10.5 Shaft and Enclosure
2-iii
Part 3 BNBC 2015 FINAL DRAFT 3-43
General Building Requirements, Control and Regulation 3-43
3-43
2.10.6 Fire Detection, Alarm, Evacuation and Extinguishment System 3-43
2.10.7 Special Hazards 3-43
2.11 REQUIREMENTS FOR OCCUPANCY G–INDUSTRIAL BUILDINGS 3-43
2.11.1 Construction, Height and Allowable Area 3-43
2.11.2 Location on Property 3-43
2.11.3 Access and Exit Facilities and Egress System 3-44
2.11.4 Lighting, Ventilation and Sanitation 3-44
2.11.5 Shaft and Enclosure 3-44
2.11.6 Fire Detection, Alarm, Evacuation and Extinguishment System 3-44
2.11.7 Special Hazards 3-44
2.12 REQUIREMENTS FOR OCCUPANCY H–STORAGE BUILDINGS 3-44
2.12.1 Construction, Height and Allowable Area 3-44
2.12.2 Location on Property 3-44
2.12.3 Access and Exit Facilities and Egress System 3-44
2.12.4 Lighting, Ventilation and Sanitation 3-44
2.12.5 Shaft and Enclosure 3-45
2.12.6 Fire Detection, Alarm, Evacuation and Extinguishment System 3-45
2.12.7 Special Hazards 3-45
2.13 REQUIREMENTS FOR OCCUPANCY I–ASSEMBLY BUILDINGS 3-45
2.13.1 Construction, Height and Allowable Area 3-45
2.13.2 Location on Property 3-45
2.13.3 Access and Exit Facilities and Egress System 3-45
2.13.4 Lighting, Ventilation and Sanitation 3-46
2.13.5 Shaft and Enclosure 3-46
2.13.6 Fire Detection, Alarm, Evacuation and Extinguishment System 3-47
2.13.7 Motion Picture Projection Rooms 3-47
2.13.8 Sports Facilities 3-47
2.13.9 Amusement Building Fire protection System 3-49
2.14 REQUIREMENTS FOR OCCUPANCY J–HAZARDOUS BUILDINGS 3-50
2.14.1 General 3-52
2.14.2 Special Provisions 3-53
2.14.3 Construction, Height and Allowable Area 3-53
2.14.4 Location on Property 3-53
2.14.5 Access and Exit Facilities and Emergency Escapes 3-53
2.14.6 Lighting and Ventilation
2.14.7 Sanitation Vol. 1
2.14.8 Shaft and Exit Enclosures
2-iv
Part 3 3-53
General Building Requirements, Control and Regulation 3-53
3-54
2.14.9 Fire detection, Alarm, Evacuation and Extinguishment system 3-54
2.14.10 Explosion Control 3-54
2.14.11 Special Hazard 3-55
2.15 REQUIREMENTS FOR OCCUPANCY K–GARAGE BUILDINGS 3-55
2.15.1 Construction, Height and Allowable Area 3-55
2.15.2 Location on Property 3-55
2.15.3 Access and Exit Facilities and Emergency Escapes 3-55
2.15.4 Lighting, Ventilation and Sanitation 3-55
2.15.5 Shaft and Enclosure 3-55
2.15.6 Fire Detection, Alarm, Evacuation and Extinguishment System 3-55
2.16 REQUIREMENTS FOR OCCUPANCY L – UTILITY BUILDINGS 3-55
2.16.1 Construction, Height and Allowable Area 3-55
2.16.2 Location on Property 3-55
2.16.3 Access and Exit Facilities and Egress System 3-56
2.16.4 Lighting, Ventilation and Sanitation 3-56
2.16.5 Shaft and Enclosure 3-56
2.16.6 Fire Detector, Alarm, Evacuation and Extinguishment System 3-56
2.16.7 Special Hazard 3-56
2.17 REQUIREMENTS FOR OCCUPANCY M – MISCELLANEOUS BUILDINGS 3-56
2.17.1 General 3-56
2.17.2 Location on Property 3-56
2.17.3 Access and Exit Facilities and Emergency Escapes 3-56
2.17.4 Lighting, Ventilation and Sanitation
2.17.5 Shaft and Exit Enclosures
2.17.6 Fire Detection, Alarm, Evacuation and Extinguishment System
BNBC 2015 FINAL DRAFT
Chapter 3 CLASSIFICATION OF BUILDING CONSTRUCTION TYPES BASED ON FIRE RESISTANCE
3.1 General 3-83
3-83
3.1.1 Classification by Type of Construction 3-84
3.1.2 Group I. Non-combustible Construction 3-84
3.1.3 Group II. Combustible Construction 3-88
3.1.4 Separated Occupancy and Construction 3-88
3.1.5 Fire Zones 3-89
3.1.6 Permissible Types of Construction for Various Occupancies 3-89
3.1.7 Exterior Walls 3-89
3.1.8 Basement Floor 3-89
3.1.9 Restricting Horizontal and Vertical Spread of Fire
2-v Vol. 1
Part 3 BNBC 2015 FINAL DRAFT 3-89
General Building Requirements, Control and Regulation 3-91
3-91
3.1.10 Exceptions to Fire Resistance Requirements 3-92
3.1.11 Shaft Enclosures 3-92
3.1.12 Expansion and Contraction Joints 3-92
3.1.13 Weather Protection 3-92
3.1.14 Members Carrying Walls 3-92
3.1.15 Parapets 3-93
3.1.16 Projections 3-93
3.1.17 Guards and Stoppers 3-94
3.1.18 Insulation
3.1.19 Atrium 3-95
3.1.20 Mezzanine Floors 3-95
Chapter 4 ENERGY EFFICIENCY AND SUSTAINABILITY 3-95
4.1 SCOPE 3-96
4.1.1 Rationale for Sustainable/Green Buildings 3-96
4.2 DEFINITION 3-96
4.3 SITE SUSTAINABILITY 3-96
4.3.1 Mandatory Unpaved Area 3-96
4.3.2 Site Drainage and Run-Off Coefficient 3-97
4.3.3 Vegetation Plan 3-97
4.3.4 Irrigation Plan 3-97
4.3.5 Rain Water Harvesting System 3-99
4.4 BUILDING ENVELOPE 3-99
4.4.1 Window to Wall Ratio 3-101
4.4.2 Window Openings 3-101
4.4.3 Shading 3-101
4.4.4 Roof insulation and Green Roofing System 3-101
4.5 ENERGY EFFICIENT BUILDING SYSTEMS 3-101
4.5.1 Day lighting and Supplementary Lighting System 3-102
4.5.2 Lighting Power Density 3-102
4.5.3 Occupancy Sensors 3-103
4.5.4 Ceiling/ Wall Mounted Fans 3-103
4.5.5 Lift and Escalator Efficiencies 3-103
4.5.6 Renewable Energy Options 3-103
4.5.7 Heating Ventilation and Air-conditioning (HVAC) system 3-103
4.6 INTERNAL WATER MANAGEMENT
4.6.1 Reuse of Grey Water Vol. 1
4.6.2 Efficient Fittings in Toilets
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4.6.3 Service Hot Water and Pumping 3-103
APPENDICES
Appendix A Planning and Development Control 3-105
Appendix B Guidelines for Minimum Standard Housing Development 3-111
Appendix C Special Requirements of Cluster Planning for Housing 3-121
Appendix D Universal Accessibility 3-125
Appendix E Building types, Development Rights and Buildings abutting property lines 3-155
Appendix F Road hierarchy, On-street and Off-street Parking 3-159
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2-viii Vol. 1
Chapter 1
GENERAL BUILDING REQUIREMENTS
1.1 SCOPE
This Part of the Code puts forward classification of buildings based on occupancy or nature of use and deals with
the general and specific requirements of each of the occupancy groups. Fire resistance requirements are
expressed in terms of type of construction which shall conform to the specified fire-resistive properties.
1.2 TERMINOLOGY
BNBC 2015 FINAL DRAFT
This Section provides an alphabetical list of the terms used in and applicable to this Part of this Code. In case of
any conflict or contradiction between a definition given in this Section and that in any other Part of this Code, the
meaning provided in this Part shall govern for interpretation of the provisions of this Part.
ACCESSIBILITY The provision in a plot or a building or a facility or any part thereof that can be approached,
entered and used without assistance by persons with temporary or permanent physical
ACCESSIBILITY limitations.
ROUTE
ACCESSIBLE A continuous unobstructed path that starts from the entry and shall continue through all
accessible elements and spaces within a plot and buildings or facilities thereof up to the
ADAPTABLE exit termination.
AREA PLANNING
AUTHORITY The term accessible or adaptable shall be used as a prefix for spaces or features which are
ASSEMBLY designed for persons having physical limitation; such as accessible toilet, accessible kitchen,
accessible lift and so on.
ATRIUM
See ACCESSIBLE
BALCONY
A government or semi-government agency or a local body which has been legally designated
BALUSTER to formulate land use or plans of the area under their jurisdiction.
BALUSTRADE
In a building or a portion thereof used for gathering of 50 or more persons for deliberation,
worship, reading, entertainment, eating, drinking, awaiting transportation, or similar uses
not limited to these; or used as a special amusement building, regardless of occupant load.
A large volume space within a multistoried building having series of floor openings or
corridors or similar elements in and around and floors are connected from there and series
of openings or a glazing on roof or a portion thereof constructed with glazing and having a
minimum two stories high. The word Atria or Atriums are the plural form of Atrium.
A covered and hanging platform at a height of minimum 2.286 m from the plinth level of a
building and having access from any floor level and which is laterally open to outer air by
three sides up to 2.06 m in height and edges are protected with guards. Within an interior
space, a balcony is a portion which are positioned sidewise as similar as Mezzanine.
Single vertical member of a guardrail or a Handrail or a member of both which shall be
complied with the provisions of this Code.
Plural form of BALUSTER.
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General Building Requirements, Control and Regulation
Part 3
General Building Requirements, Control and Regulation
BARRIER A wall or a partition or a floor slab or a ceiling within a building which confines and protects
flow of smoke and fire from the exposed side of the barrier. The fire rating of barriers shall
be complied with the provisions of this Code.
BASEMENT A floor of a building or a portion thereof which is situated as a whole or partially at depth of
minimum 50 percent of ceiling height below formation level shall be called as a basement.
BUILDING LINE The peripheral lines of a building mass or volume up to which the plinth area or any floor
area may be lawfully extended within a plot.
CARRIAGEWAY A path including over bridge or bridge which is open to the outer air and may or may not be
covered or roofed or an underpass, design and designated for vehicles only
CEILING HEIGHT Height measured from the top of finished surface of floor level up to the bottom of roof or
ceiling or suspended or false ceiling level or Beam drops. In case of multistoried building,
Vertical distance in between two slabs from which deduction shall be made for any
suspended or false ceiling or Beam drops. For slope or pitch ceiling or roof, the minimum
value shall be the ceiling height.
COMMON SPACE See NON-SEPARATED SPACE CONDITION
CONDITION
BNBC 2015 FINAL DRAFT
CONTROL AREA A space or a room within a building enclosed by barriers with the fire rated walls, floor and
ceiling, where the quantity of hazardous material shall not be exceeded the maximum
allowable quantity per control area for storing, displaying, handling, dispensing or using as
per provisions of this Code.
DETACHED A building separated by distance in a same plot to accommodate different type of
OCCUPANCY occupancies shall be termed as Detached Occupancy.
DEVELOPMENT A government or semi-government agency or a local body which has been legally designated
AUTHORITY to carry out and/or control any works of land development of an area having jurisdiction.
FAR (FLOOR FAR is a ratio between the area of a plot and the sum of floor areas of building or buildings
AREA RATIO) are erected or intended to be erected thereof. In the buildings, there may have some specific
and calculated floor areas which shall be treated as bonus or exempted from the total floor
area calculation and such areas shall be specified by the authorities having jurisdiction.
FIRE An uncontrolled fire which poses threat to safety of life or property or both.
FIRE A minimum distance which to be maintained between potential sources and/or between
SEPARATION structures for fire safety. In case of differences between building setback and the required
DISTANCE minimum fire separation distance measurement; the higher value shall be implied.
FLOOD
A Land or a plot normally dry but submerges or drowns as whole or partially by over flown
FLOOD LEVEL water from any source.
FLOOD PRONE A measurement of height from an existing ground level or from top level of river water of an
AREA area or a locality recorded in a Flood Hazard Map by the authorities having jurisdiction.
FLOOR HEIGHT
At least once in a year a dry ground of an area or a plot or a portion thereof flooded at a
FRONTAGE height of 1m or more shall be designated as a Floor Prone Area.
FORMATION In a multistoried building, floor height shall be measured from the top of finished surface of
LEVEL the two successive floor slabs and the measurement of the top most floor shall be from the
top of finished surface of the floor slab and the top of the finished roof, in case of the slope
roof, measurement shall be taken up to pick of that slope.
Irrespective of the entry provision to a plot, full or partial length of any sides of a plot which
are abutted to roads or streets shall be designated as frontage.
Finished ground level of a plot. For hilly areas formation levels shall be the gradient of the
plot surface.
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General Building Requirements Chapter 1
GALLERY A special type of seating arrangement where each and every row or tier of seats are
successively elevated to provide a clear view to audiences or spectators within and around
GUARD a playground or outdoor or indoor stadium or within an auditorium or in a hall.
HEAD ROOM
CLEARANCE A vertical protective barrier erected up to a height along exposed edges of stairways,
balconies and similar areas.
HELISTOP
HIGH RISE A vertical distance measured from the top of finished floor level up to the bottom of ceiling
BUILDING or lowest roof level or bottom of beam drop or bottom of any hanging element within a
LIGHTING SHAFT space. In case of a stairway, a vertical distance measured from the bottom surface of flight
or ceiling or beam drop to any outer edge point of a tread below and for the landings ceiling
LOFT height measurement system shall be adopted to determine head room clearance.
MANDATORY
OPEN SPACE A designated area on ground or on water or on a portion of a building for helicopter landing
MEZZANINE or takeoff without servicing, repairing and refueling facilities.
FLOOR
Any building which is more than 10-storey or 33 m high from reference datum. Building
MIXED appurtenances like overhead water tank, machine room, communication tower etc. will not
OCCUPANCY be considered in determining the height.
NON SEPARATED
SPACE A space within a building which is fully enclosed by all sides and shall be open to the sky to
CONDITION provide daylight to adjacent interiors and less than the dimensions that stipulated for
minimum closed or internal courts of corresponding to the building heights.
An intermediate space in-between a floor or a ceiling and under a pitch or a slope roof of a
building.
The spaces within a plot which shall remain unpaved with or without vegetation to allow
water penetration and uncovered up to the sky from formation level of the building. No
underground or above ground construction is allowed in such spaces.
Within one space where more than one floor exists, the floor at the lowest level shall be
designated as main floor and each Intermediate floor is limited to an area which is not more
than one third of the main floor under one roof or one ceiling, thus gives two or more
useable floor levels. These types of intermediate floors shall be designated as mezzanine
floors. Mezzanine floor may be as gallery or flat floor type and which also includes interior
balcony.
When two or more occupancies are amalgamated in a building shall be termed as Mixed
Occupancy.
Walls or partitions between compartments, rooms, spaces or areas within a building or part
of a building which are not separated by an approved fire rated barrier walls or partitions
shall be designated as non-separated space condition or effective undivided single space.
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OPENINGS Apertures or holes in any wall of a building that allow air to flow through and which are
designed as open.
OPENING,
VERTICAL An opening through a floor or roof of a building.
OPEN SPACE
Open space within a plot includes all spaces other than spaces covered by the Maximum
PLINTH Ground Coverage (MGC)
PLINTH LEVEL
Bases of the building and the elements that negotiate with the ground.
PLINTH AREA
Height of a covered finished floor which is just above the formation level and measured from
the formation level up to the top of that finished floor.
The elements from the building bases which are exposed above the formation level to form
a covered floor area by joining the peripheral points of the elements which are intersected
finished floor plane at the height of plinth level shall be designated as Plinth Area.
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PLOT A scheduled piece or parcel of land which is classified and restricted to its intended use.
RAMP A sloping walkway which is steeper than 1 in 20 but not steeper than 1 in 8 and shall have
guard and handrail.
RAMP, A sloping walkway not steeper than 1 in 12.
ACCESSIBILITY
RAMPED Ramped Driveways are inclined floors that provide access to vehicles between two levels.
DRIVEWAY Ramped walkway when provided side by side of a ramped driveway shall be separated by
safety guard rails and curbs. A sloping driveway or Ramped Driveway steeper than 1 in 8
shall not be credited as a component of means of exit.
RAMP GRADIENT Ramp gradient refers to the ratio of the inclination of a ramp (height by length ratio)
measured along the center line of the ramp.
ROAD LEVEL The road level means top surface at the center point of the road width which is used for site
entry and shall be considered as the reference point for measuring height or depth of any
development.
ROOF Weather exposed and uncovered surface of the topmost or the terminal ceiling of a building
which may be horizontal or pitched or may have slopes shall be treated as the roof of a
building.
BNBC 2015 FINAL DRAFT
SEPARATED A building or a portion thereof separated by barriers with wall or ceiling slab that into two
OCCUPANCY or more parts to accommodate different type of occupancies in different parts.
SEPARATE SPACE Rooms, spaces or areas within a building when separated by approved barrier wall.
CONDITION
SEPARATION This is a peripheral wall of a building or a building which shall be divided into two or more or
WALL a common wall between two buildings to control spreading of fire as per provisions of this
Code.
SITE See PLOT
SMOKE DRAFT A vertical panel dropped from the ceiling of a building or portion thereof to protect and
BARRIER control the movement of smoke draft during fire. The construction of such smoke draft
barriers shall be complied with the provisions of this Code.
STAGE An elevated platform which is designed or used for presentation of plays or lectures or other
entertainments in front an assembly of spectators or audiences.
STAGE, INTERIOR An elevated platform within a building which is designed or used for presentation of plays
or lectures or other entertainment in front an assembly of spectators or audiences.
STAGE, Ceiling Height of a stage from the top surface of the platform is 15.24 m or more shall be
LEGITIMATE designated as a legitimate stage.
STORAGE A storage or display of solid or liquid merchandises shall not be exceeded 976 kg/m2 or 814
DENSITY L/m2 respectively and shall be limited to the exempted quantity of an actually occupied net
floor area. Maximum height of display or storing of merchandises shall not be exceeded 1829
mm or 2438 mm respectively. Allowable Height and Quantity may be less depending on the
total area and the ceiling height of a store or a display.
STREET OR ROAD An open to outer air and unobstructed space having required width and used by the public
as pedestrian or walkway or animal or vehicular movement or any combination of these for
the purpose of access to a plot or plots and is connected with the national public
transportation system other than railway track shall be designated as street or road which
may or may not be paved.
STREET OR ROAD The width of any street or road shall be measured form any plot to its opposite or face to
WIDTH face plot distance. For the determination of a road width, measurements shall be taken up
to the connection of the national public transportation system other than railway track from
any plot and the least width shall be the road width.
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STREET FLOOR A story or floor level of a building which is accessible at the main entrance of a building from
LEVEL the street or from the outside at ground level and the floor shall not be more than three
risers above or below the grade level.
STRUCTURAL All members or elements such as columns, girders, beams, trusses and spandrels which
FRAME forms a frame and have direct connections with bearing and transferring as an integral and
essential elements for the stability of a building or a structure as a whole.
SURGE PRONE Expected occurrence of a surge or wave of water may flow above 1 m or higher from the
AREA formation level.
TALL STRUCTURE A building used for human occupancy located more than 80m high from the center of the
adjacent road level or from lowest level of the fire department vehicle access.
TERRACE A paved surface not steeper than 1 in 20 and adjacent to a building which is connected by a
stairway or a walking ramp or at the same level of any floor below the roof level of a building
and at least one side of that area is exposed to the weather and having the guards and open
to the sky.
UNIVERSAL See ACCESSIBILITY
ACCESSIBILITY
BNBC 2015 FINAL DRAFT
UNPROTECTED The element that shall have no prerequisites of fire protection rating.
VENTILATION A space sidewise enclosed but open to sky used to provide ventilation as inlet and/or outlet
SHAFT, NATURAL to adjacent interiors of dimensions less than that stipulated for internal courts of
corresponding to building heights.
VERANDAH Portions of a building at any level which have ceiling or roof and at least one side open up to
2.13 m height to the outside air and have guards as per provisions of this Code.
WALKUP A multi storied building which does not have any mechanical means of vertical circulation
BUILDING other than stairway shall be designated as a walkup building and the maximum height of
the walkup building shall be as per provision of this Code or as approved by the authority
having jurisdiction.
1.3 LAND USE CLASSIFICATION
A city or a township or a municipality or a union or any other habitat development shall be brought under a
structured planning including detailed area planning to implement the intended land use pattern, transportation
and maintaining environmental conditions by the development or planning authorities and shall be approved by
the government. This land use classification may divide an area into zones such as residential, commercial,
industrial, storage, green park, agricultural land, reserved area etc. or any combination of these. The land use
zones shall be shown on the approved master plan of the area and the planning regulation shall clearly state the
permitted occupancies, restricted occupancies and conditionally permitted occupancies for each zone.
1.4 OCCUPANCY AND CONSTRUCTION CLASSIFICATION OF BUILDINGS
Every building or portion thereof shall be classified according to its use or character of occupancy. A brief
description of such occupancy groups is presented in Table 3.1.1. Details of all occupancy group and sub-divisions
are set forth in Sec 2.1 of Chapter 2 of this Part. Types of construction based on fire resistance are specified in
Table 3.1.2. Details of such types of construction are set forth in Chapter 3 of this Part. Any development permit
for a site or a location shall clearly mention the permitted occupancy and construction type in accordance to
Tables 3.1.1 and 3.1.2 for the existing or proposed building.
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Table 3.1.1: Summary of Occupancy Classification
Occupancy Type Subdivision Nature of Use or Occupancy Fire Index*
1
A: Residential A1 Single family dwelling 1
1
A2 Two families dwelling 1
1
A3 Flats or apartments 1
1
A4 Mess, boarding houses, dormitories and hostels 1
1
A5 Hotels and lodging houses 1
1
B: Educational B1 Educational facilities up to higher secondary levels 1
1
Facilities B2 Facilities for training and above higher secondary education 2
2
B3 Pre-school facilities 2
2
C: Institution for C1 Institution for care of children 2
Care C2 Custodial institution for physically capable adults 2
2
C3 Custodial institution for the incapable adults 2
3
C4 Penal and mental institutions for children 3
3
C5 Penal and mental institutions for adults 3
1
D: Healthcare BNBC 2015 FINAL DRAFTD1 Normal medical facilities 1
Facilities D2 Emergency medical facilities
1
E: Business E1 Offices
1
F: Mercantile E2 Research and testing laboratories
E3 Essential services 1
F1 Small shops and market
4
F2 Large shops and market
4
F3 Refueling station 4
4
G: Industrial G1 Low hazard industries 2
Buildings G2 Moderate hazard industries 1
3
H: Storage H1 Low fire risk storage 2
Buildings H2 Moderate fire risk storage 2
I: Assembly I1 Large assembly with fixed seats
I2 Small assembly with fixed seats
I3 Large assembly without fixed seats
I4 Small assembly without fixed seats
I5 Sports facilities
J: Hazardous J1 Explosion hazard building
Building
J2 Chemical hazard building
K: Garage J3 Biological hazard building
J4 Radiation hazard building
L: Utility K1 Parking garage
M: Miscellaneous K2 Private garage
K3 Repair garage
L Utility
M1 Special structures
M2 Fences, tanks and towers 1
* Fire Index: fire index is an absolute number, Occupancy group having same fire index may be permitted as mixed occupancy
and different fire index shall be separated or detached as per provisions of this Code.
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Table 3.1.2: Summary of Classification of Buildings Based on Types of Construction
Construction Group Construction Type Description
Type I-A 4 hour protected
3 hour protected
Type I-B 2 hour protected
1 hour protected
Group I: Non-combustible Type I-C Unprotected
Heavy timber
Type I-D Protected wood joist
Unprotected wood joist
Type I-E Protected wood frame
Unprotected wood frame
Type II-A
Type II-B
Group II: Combustible Type II-C
Type II-D
Type II-E
1.5 REQUIREMENTS OF PLOTS
BNBC 2015 FINAL DRAFT1.5.1 General Requirements
1.5.1.1 No building shall be constructed on any site which is water logged, or on any part of which is deposited
refuse, excreta or other objectionable material, until such site has been effectively drained and cleared to the
satisfaction of the Authority.
1.5.1.2 Provision shall be kept for any space within the plot left vacant after the erection of the building to be
effectively drained by means of surface or underground drainage system.
1.5.1.3 Basic minimum sanitary waste and excreta disposal facility shall be created on the premises, whether
or not the plot is served by a disposal system provided by any utility service authority or agency.
1.5.1.4 Written approval of the Authority or the appropriate drainage and sanitation authority shall be
obtained for connecting any soil or surface water drain to the sewer line.
1.5.2 Clearance from Overhead Electric Lines
A building or any part thereof shall not be erected within, nor any auxiliary part of the building be allowed to
come closer to the distance shown in Table 3.1.3 from any overhead electric line.
Table 3.1.3: Minimum Distances from Overhead Electric Lines
Line Voltage Vertically (m) Horizontally (m)
Low to medium voltage lines and 2.5 1.25
Service lines
High voltage lines up to 33 kv 3.5 1.75
High voltage lines beyond 33 kV 3.5 plus 0.3 for each additional 33 kV 1.75 plus 0.3 for each additional 33
or part thereof kV or part thereof.
1.5.3 Road , Formation Level and Plinth Levels
1.5.3.1 Road level shall be lower than the habitable formation level of an area, except that of a hilly region.
When a road is designed and designated as a part of national disaster management system formation levels shall
be determined by the authorities having jurisdiction.
1.5.3.2 The formation level of a plot shall not be lower than the adjacent road levels, except that of a hilly
region. For hilly region, the elevation of the formation level shall be determined by the authority having
jurisdiction. Where areas are not susceptible to flood or water logging, the formation level shall not be more than
450 mm high from the surface level of the center line of the adjacent roads.
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1.5.3.3 The plinth level of a building shall be at least 450 mm above the surface level of the center line of the
adjacent road. In Flood or Surge prone area plinth level shall be determined by the development authority having
jurisdiction.
1.5.4 Boundary Wall
1.5.4.1 Solid boundary walls of a plot or in between plots shall not be higher than 1.5 m or a boundary made
of grill, screen, balustrade etc. with a maximum height of 2.75 m shall not require the permission of the Authority.
For boundary walls made of a combination of solid wall and grill or screen, the solid wall portion shall not be
higher than 1.5 m. The Authority may, on specific application, permit the use of higher boundary walls.
1.5.4.2 Construction of a boundary wall shall be capable to resist collapsing as per provision of this Code.
1.6 PLOT SIZES
Plot divisions and plot sizes are part of integrated planning decision of detail area plan and shall be determined
by the Area Development Authority having jurisdiction. Where no such guideline exists or yet to be undertaken,
the criteria mentioned in Sec A.5 of Appendix A regarding plot size shall be applicable.
1.7 MEANS OF ACCESS
The provision of means of access is implied on an area or a plot when more than one plots are intended to be
created or when more than one buildings are intended to be erected respectively, where such plots or buildings
do not have frontage to or not approachable by a public or a private road or street. All buildings within such area
or a plot shall have access facilities which shall be connected with national road transportation system. The
components of means of access shall comply with the followings:
(a) The access facilities shall meet the requirements of fire service vehicles and engines movement for rescue
and fire extinguishment operation.
(b) Where required for fire apparatus access roads shall have an unobstructed carriageway width of 4.8 m
and the minimum vertical clearance shall be 5m. The width and vertical clearance of fire apparatus access
roads may be increased as per requirement of the fire authority, if the clearances are not adequate to
provide fire apparatus access.
(c) Access roads longer than 30 m having a dead end shall be provided with appropriate provisions for turning
around of the fire apparatus at the dead end.
(d) The provision of fire apparatus stall be marked by approved sign.
(e) For large Assembly Occupancy of I1, I3 and I5, width of the approach road shall not be less than 15 m.
(f) The minimum width of the approach road for all plots other than residential and assembly occupancies
mentioned in Sec 1.7(e) and Sec 1.7(g) shall be 10.8 m.
(g) For area fully covered by private hydrant system with street side hydrant points and/or hydrants within
the building equivalent to fire service and civil defense department’s specification and the buildings have
fire stairs as per provisions of this Code, the requirements of Sections 1.7(a), (b) and (c) may be exempted.
This provision shall not be applicable for planning new developments. The minimum width of access roads
for plot divisions in new developments shall follow guidelines of Table 1 of Appendix F.
1.7.1 Internal Access Road
Internal access road is legally restricted for thoroughfare to the citizens and/or reserved for a group of people of
a plot or an area that shall have access provisions for the department of fire service and civil defense.
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1.7.1.1 The width of access roads and drive ways in a plot or an area shall be decided by the number and height
of the buildings served thereby.
Table 3.1.4: Maximum Permissible Length of Internal Access Roads in Non-Residential Plots
Width (m) Maximum Permissible Length (m)
6 80
7 150
8 300
10.8 or more Unlimited
1.7.2 Pedestrian Path or Walkway or Footpath
Any path including over bridge or bridge which is open to the outer air and may or may not be covered or roofed
or an underpass design and designated for walkers only shall be designated as pedestrian path or walkway or
footpath.
1.7.2.1 An uncovered paved pedestrian path that links buildings and the approach road shall not be included
as a floor area of a building.
1.7.2.2 The walkways shall not be used for any other purpose than pedestrian movement and as accessibility
route.
1.7.2.3 The minimum width of the pedestrian path shall not be less than the calculated width of connected
corridor or passage or walking ramp of a building for entry or exit provided it is not enclosed by adjacent walls on
both sides; for pedestrian paths enclosed by adjacent walls on both sides the minimum width shall be 1.25 m. For
public buildings and places where high pedestrian movement is expected, Table F.3.1 of Appendix F may be
followed.
1.7.2.4 Pedestrian walkways as accessibility route in public buildings shall comply with the provisions of this
Code. Any changes in elevation in accessibility route shall comply with the provisions of Appendix D (Universal
Accessibility).
BNBC 2015 FINAL DRAFT
1.8 OPEN SPACES WITHIN A PLOT
1.8.1 Minimum open space requirements for the sides, rear and frontages of a plot shall be as per the
provisions of this Code or the authority having jurisdiction. In absence of such guideline, provisions of Sec 1.8.2
to Sec 1.8.11 shall decide the provisions of open space for any building or buildings within a site. All such open
spaces shall ensure access of the users.
1.8.2 At least 50 percent of the minimum open space in a plot shall remain unpaved with or without vegetation
to allow water penetration.
1.8.3 The total open area in a plot on which a building of educational, institutional, health care occupancy is
constructed shall not be less than 50 percent of the plot area.
1.8.4 The total open area in a plot on which a building of any occupancy, except those mentioned in1.8.3, is
constructed shall not be less than 33 percent of the plot area.
1.8.5 For the purpose of Sec 1.8.2, Sec 1.8.3 and Sec 1.8.4, the total open area shall include all exterior open
spaces and interior courtyards, but exclude the area of any lighting and ventilation shaft.
1.8.6 For approved row type or cluster type housing or site and service schemes, the requirement of Sec 1.8.3
shall be applicable.
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1.8.7 Separation of Buildings in the Same Plot
1.8.7.1 More than one building in a plot shall comply with the requirements of means of access and setback
distances in relation with the corresponding building height and the occupancy classification as per provisions of
this Code and laws of the land.
1.8.7.2 To determine the separation distance between buildings of same height and same occupancy an
equidistant imaginary line shall be drawn between the buildings where each building shall comply with
requirement of setback and fire separation distance from that imaginary line.
1.8.7.3 Exception: Utilities under Occupancy L is incidental to operation in all type of occupancy except
Occupancy J and shall not require the separation distance from the main occupancy. This exception shall not be
applicable for Occupancy J.
1.8.7.4 When variation in either height or occupancy occurs, the imaginary line shall satisfy the setback
distances for each individual building separately as shown in Figure 3.1.1.
1.8.7.5 Due to the common walls, row or semidetached houses shall be treated as one building. For
semidetached houses separation distance in the detached sides shall comply with Sec 1.8.7.2 and Sec 1.8.7.3.
Figure 3.1.1 Separation distance for variation in occupancies and heights
1.8.8 Front Open Space for All Buildings
1.8.8.1 Irrespective of the height of building frontage open space shall be constructed at a distance of at least
4.5 m from the center of the street or at least 1.5 m from the street-front property line whichever is larger.
1.8.8.2 In a corner situation where two frontages of a plot intersects each other and form a sharp corner a
turning clearance with a minimum radius of 2 m shall be required as per guidelines of Figure 3.1.3. No construction
or visual obstruction shall be allowed within such turning clearance space.
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1.8.9 Side and Rear Separation Distances
1.8.9.1 The minimum side and rear open space requirements of a plot for buildings of various occupancy
classes shall be as specified in Table 3.1.5.
1.8.9.2 For approved row type residential, mercantile or office as may be permitted by the respective city or
development authority and for approved affordable row type, cluster or site and service schemes, the
requirement of side separation distance may be waived as per provisions of this Code.
BNBC 2015 FINAL DRAFT
Figure 3.1.2 Definition of front, side and rear of a plot 3-11
Bangladesh National Building Code 2015
Part 3
General Building Requirements, Control and Regulation
BNBC 2015 FINAL DRAFTFigure 3.1.3 Restrictions for corner-plots
1.8.9.3 For semidetached buildings approved by the city or development authority, which are permitted to be
constructed with one side on the property line or with pounding gap, the minimum requirements of open space,
specified in Sections 1.8.9.1 and 1.8.9.2, for the side opposite to that property line shall be increased as per Table
3.1.5. The requirement of separation distance for the remaining sides shall remain unchanged.
Table 3.1.5: Minimum Rear and Side Open Space Requirements of a Plot
Occupancy Plot Size* Rear Separation Distance Side Separation Distance
(m²) (m) a(m)
Residential (Row type, not higher 1.25 Nil b
than 15m or 4 stories) Not over 67 1.5 Nil b
Residential (Semi-detached, not Over 67 to below 134 2.5
higher than 10 stories or 33 m) 3.0 PGc, 2.5
Residential (Detached, Not higher 134 to 268 2.5 PGc, 2.5
than 10 stories or 33 m) Over 268
Residential (Detached, Not higher 134 to 268 3.0 1.25
than 10 stories or 33 m)
Residential(Detached, Higher than Over 268 3.0 1.25
10 stories or 33 m)
Institution for care Over 268 3.0 3.0
Educational, As permitted for this 3.0 3.0
occupancy
Assembly 3.0 3.0
Business and Mercantile d As permitted for this 1.5
(Not higher than 10 stories or occupancy 3.0
33 m) semi-detached Any PGc, 3.0
Business and Mercantile Any
(Not higher than 10 stories or 1.25, 2.5
33 m) Detached Any 1.5
Business and Mercantile d (Higher PGc, 6.0
than 10 stories or 33 m) semi- Over 536 3.0
detached 3.0
Business and Mercantile (Higher Over 536 3.0
than 10 stories or 33 m) Detached As per provisions of this Code As per provisions of this Code
Industrial As permitted for this
occupancy
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General Building Requirements Chapter 1
Occupancy Plot Size* Rear Separation Distance Side Separation Distance
(m²) (m) a(m)
Storage As permitted for this As per provisions of this Code As per provisions of this Code
occupancy
Hazardous As permitted for this As per provisions of this Code As per provisions of this Code
occupancy
Notes:
a The two dimensions separated by comma stands for each of side separation distances of a semi-detached development.
b No side separation distance is required between buildings up to 15 m or 4 stories even for independent plots.
c PG stands for ‘Pounding Gap’, which is a calculated gap for safe distance to avoid pounding due to lateral loads as per provisions
of Part 6 of this Code. This gap is not required if the adjoining plots are consolidated and built monolithically. Where pounding
gap do not comply with the minimum separation distance, all walls within the separation distance shall be barrier walls.
d Mercantile occupancies shared walls between adjacent plots shall only be allowed in accordance to the detail area plan (DAP)
administered by the development authority.
* For narrow plots (with site frontage below 12 m) of size 268 m² or above in unplanned areas, the local regulatory authority may
allow semi-detached typology with a minimum side separation distance of 3m on the unattached side.
1.8.10 Courtyard and Interior Courtyard
An area having proper dimensions as per provision of this Code and open to the sky from the formation level and
surrounded by a building or a group of buildings or walls or combination thereof shall be designated as Courtyard.
The minimum size of such courtyard shall be derived from Table 3.1.6 depending on the height of the highest
building or highest wall abutting the courtyard. The shorter side dimension of such courtyard shall not be less
than one-third of the longer side dimension. All such courtyards shall remain open to sky over its entire cross
section.
BNBC 2015 FINAL DRAFT
When the sum of exposure area of a courtyard to outer air through its adjacent walls exceed more than thirty
percent area of its total peripheral enclosure it shall be designated as Open courtyard. All other courtyards shall
be designated as Interior or Closed courtyard.
1.8.10.1 If any room depends entirely on an interior open space for its natural light and ventilation, such interior
open space shall be in the form of an interior courtyard open to the sky over its entire cross-section. The interior
courtyard shall have the minimum dimensions depending on the height of the building as specified in Table 3.1
6. The shorter side dimension of such interior courtyard shall not be less than one-third of the longer side
dimension.
Table 3.1.6: Minimum Area of Interior Courtyard
No. of Stories Maximum Height Minimum Net Area of the
(m) Interior Courtyard, m2
Up to 3 11 9
4 14 16
5 17 25
6 20 36
7 23 49
8 26 64
9 29 81
10 32 100
11 36 121
12-13 42 144
14-15 48 196
16-17 54 256
18-20 63 361
Notes:
1. For buildings above 20 storeys height, the size of the interior courtyard shall not be less than the
square of one-third the height of the tallest wall abutting the courtyard.
2. Enclosed open to sky spaces used to provide ventilation as inlet/outlet or daylight to adjacent
interiors having dimensions less than that stipulated for internal courts of corresponding storey
height given in this Table will be considered ventilation or lighting shafts and not interior courtyards
and will follow minimum requirements stipulated in Table 3.1.11
Bangladesh National Building Code 2015 3-13
BNBC 2015 FINAL DRAFTPart 3
General Building Requirements, Control and Regulation
1.8.10.2 The courtyard shall not be interrupted by any form of construction at the courtyard level, except
landscaping, sculpture, walkways and water bodies.
1.8.10.3 If the courtyard is to serve as a component of the means of egress, it shall be accessible from all exit
points at ground level.
1.8.11 Permitted Construction in the Mandatory Open Space
1.8.11.1 Landscaping, sculpture, walkways, water body shall be permitted in the open space. Any such
construction shall comply with Sec 1.8.2 of this Chapter.
1.8.11.2 A maximum of 50 percent of the open space in a plot required by the provisions of Sec 1.8.8 and Sec
1.8.9 may be used for construction of garage, ramps, caretaker or guards’ quarter and other services auxiliary to
and required for the main occupancy of the building, provided that the requirement of community open space in
Occupancy A3 is attained, and building is not higher than 10 storey or 33 m, and provided further that conditions
(a) to (g) below are satisfied:
(a) No such construction permitted in the open space shall be higher than 2.75 m from the formation level
of the plot, except for the tops of inverted beams or intermittent parapets, which may rise up to
3.25 m.
(b) No window, door or ventilator shall be placed on any wall adjacent to the abutting plot or street.
(c) Entrance to the garage or sloping drive way shall not be directly from a public road or street. Distance
between the plot line adjoining the road and the entrance to a garage or a sloping drive way shall be kept
at least 1.5 m or 4.8 m respectively.
(d) Drainage from the roof or any other part of such construction shall not be allowed to discharge into the
adjacent property. Drainage from any part shall not discharge directly into the street through spouts.
(e) No structure or room shall be constructed over the garage or any other permitted service structure within
the limits of the mandatory open space.
(f) The roof of any such construction permitted in the mandatory open space shall not be used as a balcony
or a terrace or in any such manner that would interfere with the privacy of the occupants of the adjacent
property.
(g) No toilet, generator room or electrical substation shall be constructed adjoining the abutting property or
street.
1.8.11.3 Edges of slope roof or cornice of the building may be projected into the mandatory open space for a
maximum distance of 750 mm. Such extensions shall not be accessible from the building at any level. The
construction of a roof or a cornice shall be as such that rain or other water shall not fall from there into the
adjacent plot or street.
1.8.11.4 Sunshades over exterior doors or windows of the building may extend into the mandatory open space
for a maximum distance of 750 mm, provided that such sunshades are at least 2.5 m above the formation level
of the ground.
1.8.11.5 Cantilever canopy at a clear height of at least 2.5 m above the formation level may project into the
mandatory open space provided that a horizontal clearance of at least 1.5 m is maintained between the edge of
the canopy and the property line. The top surface of such canopy shall not be used as a balcony and shall not be
accessible from the building.
1.8.11.6 Balconies at levels higher than 6 m may project in to the mandatory open space by not more than 0.9
m provided that a clearance complying the separation distances required in Sec. 1.8.8 and Sec. 1.8.9 are
maintained between the edge of the balcony and the property line. Balcony shall be constructed as per provisions
of this Code.
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1.8.11.7 Water reservoirs, septic tanks, inspection pits, sewer and other underground or above ground service
lines shall be permitted in the open space provided that no part of such construction is elevated more than 150
mm above the formation level and the 50 percent mandatory open space shall be unpaved green area.
1.9 GENERAL HEIGHT AND AREA LIMITATIONS
1.9.1 Authorities having jurisdiction shall permit the built area and building height for an area in accordance
to the proposed density of the detail area plan (DAP). Where no such guideline is available, the height of the
building shall be determined by the guidelines of Sections 1.9.2.1 to 1.9.2.9 and the built area will be a resultant
of open space requirement and permitted height.
1.9.2 Height Limitations Based on Road Width
1.9.2.1 The maximum height of any building of Type I-A and Type I-B construction shall not exceed the nominal
value of two times the sum of the width of the front road and the front open space (distance between the front
property line and the building).For the purpose of fulfilling this requirement, the height limitations specified in
Table 3.1.7 shall apply.
BNBC 2015 FINAL DRAFT
1.9.2.2 For plots having front road width not less than 23 m in an approved residential or business and/or
mercantile area, there shall be no restriction on height for residential, business and mercantile buildings of Type
I-A and I-B construction provided the minimum open space requirements specified in Table 3.1.8 are satisfied.
1.9.2.3 For Type I-C construction, the maximum permissible height of the building shall be 4 storeys or 14 m
for values of two times the sum of the width of the front road and the front open space not less than 13.6 m.
Table 3.1.7: Height Limitations Based on Road Width, and Front Open Space
Maximum Permissible Height in Terms of Construction Classification
2 × (Front Road Width Group- I* Group II*
Plus Front Open Space)
Type I-A and Type I-B Type I-C Type I-D Type II-A, II-B, II-D
Below 10.6 m
10.6 m to below 13.6 m No. of Height No. of Height No. of Height No. of Height
13.6 m to below 16.6 m
16.6 m to below 19.6 m storeys (m) storeys (m) storeys (m) storeys (m)
19.6 m to below 22.6 m
22.6 m to below 25.6 m 3 11 2 8 2 8 28
25.6 m to below 28.6 m
28.6 m to below 31.6 m 4 14 3 11 2 8 28
31.6 m to below 34.6 m
34.6 m to below 37.6 m 5 17 4 14 3 11 3 11
37.6 m to below 40.6 m
40.6 m to below 43.6 m 6 20 4 14 3 11 3 11
43.6 m to below 46.6 m
and so on in increments of 3 7 23 4 14 3 11 3 11
m 8 26 4 14 3 11 3 11
9 29 4 14 3 11 3 11
10 32 4 14 3 11 3 11
11 36 4 14 3 11 3 11
12 39 4 14 3 11 3 11
13 42 4 14 3 11 3 11
14 45 4 14 3 11 3 11
15 48 4 14 3 11 3 11
Notes:
1. For plots with front road width (Sec 1.9.2.5) not less than 23 m, residential and business and mercantile buildings of Type I-A
and I-B construction shall have no height restriction subject to additional open space requirements (Sec 1.9.2.2).
2. The maximum permissible height for Type I-C construction is 4 storeys or 14 m (Sec 1.9.2.3)
3. The maximum permissible height for Type I-D and I-E of Group I construction and all types of Group II construction is 3 storeys
or 11 m (Sec 1.9.2.4)
* For all Unprotected Construction Types I-E of Group I, Type II-C and Type II-E of Group II the maximum allowable storey and
height shall be one storey and 8 m respectively.
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General Building Requirements, Control and Regulation
1.9.2.4 For Type I-D and I-E of Group I construction and all types of Group II construction, the maximum
permissible height of the building shall be 3 storeys or 11 m for values of two times the sum of the width of the
front road and the front open space not less than 13.6 m.
1.9.2.5 For applying the provisions of Sections 1.9.2.1 to 1.9.2.4, the width of the front road for the layouts
shown in Figures 3.1.2(b), (c), (d), (e) and (f) where the plot abuts more than one road, shall be taken as the
average of the widths of the abutting roads.
1.9.2.6 For buildings more than six storeys or 20 m high, the following arrangements shall be provided:
(a) Lifts of adequate size, capacity and number as per provisions of this Code.
(b) Adequate fire protection and firefighting arrangements shall be as per provisions of this Code.
(c) Adequate emergency fire escape stair depending upon the type of occupancy and occupancy load as per
provisions of this Code.
(d) For buildings with unlimited height (UL) provisions of Table 3.1.8 shall be mandatory.
Table 3.1.8: Minimum Separation Distance for Buildings of Unlimited Height
Occupancy Minimum Separation Distance from Plot
BNBC 2015 FINAL DRAFT
Frontage Rear Side
(m) (m) (m)
Residential 4.0 6.0 4.0
Business, Mercantile 6.0 6.0 6.0
Educational, Institutional for care, 6.0 6.0 6.0
Medical facilities. As per provision of this Code
Others
1.9.2.7 For buildings in the vicinity of airports or aerodromes, the height shall be limited by the requirements
of the civil aviation authority, city or area development authority or other concerned agencies of the Government.
1.9.2.8 Where more than one construction type is permitted within a building as per provision of this Code
among them the lowest fire resistance rated construction type shall be applicable for FAR allotment, and lowest
fire resistance rating shall be applicable for the whole structure.
1.9.2.9 For road width above 8.8 m, the building form shall be contained within the pyramid formed by the sky
exposure planes on all four sides or as many sides it has, following the guidelines of Figure 3.1.4
1.9.3 Area Limitations based on FAR
1.9.3.1 Fire separation distance in terms of building setback and building occupancy type and construction type
shall govern the FAR to restrict fire hazard volume. FAR shall be decided by the development authorities having
jurisdiction.
1.9.3.2 For Occupancy in which unlimited FAR is permitted, the minimum open space requirements specified
in Table 3.1 8 shall be applicable.
1.9.3.3 For the purpose of calculating FAR, the area of any floor including basement, of which at least two-third
is used exclusively for car parking and the remaining one-third is used for purposes such as mechanical plant
room, electrical substation, security cabin, reception booth, water tank, pump house, stairs, lifts and which are
accessory to the main occupancy, shall be excluded from the calculation of the total floor area of the building.
1.9.3.4 For area with high public transport accessibility and high FAR the requirement for residential private
parking should not be more than one car for every four dwellings or as per guidelines of the authority having
jurisdiction.
1.9.3.5 In specifying FAR for a zone or an area, the city or area development authority shall follow the guidelines
of Appendix-A (Development Control) and shall take into consideration the following:
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(a) Proximity to Public/Mass Transport network
(b) Availability of Urban social infrastructure including urban open spaces
(c) Environmental balance
(d) Adequacy of present and proposed Utility services
(e) Occupancy group and land-use permitted by master plan
(f) Type of construction
(g) Population density of the area
(h) Width of approach roads
(i) Traffic density in the approach roads
(j) Local fire-fighting facilities
(k) Parking facilities
BNBC 2015 FINAL DRAFT
Figure 3.1.4 Limiting envelope for stepped tower structures
1.10 OFF STREET PARKING SPACES
1.10.1 Off street parking requirement for a building or an area shall be decided by the development authority
having jurisdiction. A suggestive guideline for off-street parking given in appendix F might be followed.
1.10.2 Sloping drive way steeper than 1 vertical to 8 horizontal shall not be credited as a walking ramp. When a
sloping surface used for both driveway and walking ramp shall be demarcated and the minimum width and
sloping ratio of walkways shall be as per provisions of this Code. Sloping driveway entering below grade level shall
be protected to prevent water flow into any level that they lead to.
Bangladesh National Building Code 2015 3-17
BNBC 2015 FINAL DRAFTPart 3
General Building Requirements, Control and Regulation
1.11 STREET ENCROACHMENT
No part of any building shall project beyond the property line or building line established by the provisions of this
Code into the street, except the following:
(a) Below Grade: The footing of the boundary wall adjacent to the street may encroach on to the street land
not more than 0.3 m and shall rest at least at a depth of 1.5 m below grade.
(b) Above Grade: Marquee, canopy or other temporary cantilever type projection from buildings of business
and mercantile occupancy may project on the footpath of a road, provided that no part of such projection
is below a height of 3 m from the footpath level and that the outer edge of the canopy is at a minimum
clear horizontal distance of 0.25 m from the road side edge of the footpath. The canopy shall be so
constructed as to be readily removable without endangering the building structure. No canopy shall
project into a street without a footpath. Such canopies shall not project over Mandatory Open Space
(MOS). Under no circumstances shall the top of the canopy be used by any floor of the building.
1.12 COMMUNITY OPEN SPACE AND AMENITIES
Community open space for an area or a building shall be decided by the development authority having jurisdiction.
Where no such guide line exists or yet to be developed, the guidelines of Sections A.4 and A.5 of Appendix A and
Sec B.3.2 of Appendix B shall be applicable.
1.13 MINIMUM STANDARD OF A DWELLING
Minimum standard of a dwelling shall be decided by the development authority having jurisdiction.
1.14 REQUIREMENTS OF PARTS OF BUILDINGS
1.14.1 Plinth and Formation Levels
The plinth and formation levels of the building and the plot shall conform to the requirements of Sec 1.5.3.
1.14.2 Room Dimensions
1.14.2.1 Ceiling heights
(a) All habitable rooms in non-air-conditioned residential, business and mercantile buildings, apart from kitchen,
store room, utility room, box room and garage, shall have a ceiling height not less than 2.75 m measured from
the finished surface of the floor to the underside of the finished ceiling, or false ceiling. A maximum of one-
third of the floor area of such habitable rooms may, however, have a minimum ceiling height of 2.44 m. For
air-conditioned rooms in such buildings, the minimum ceiling height shall be 2.44 m.
In the case of pitched roof without a horizontal ceiling the lowest point of the finished ceiling shall be at least
2 m above the finished surface of the floor and the average height of the ceiling shall not be less than 2.44 m.
(b) The minimum clear head room under the ceiling, folded plate, shell etc. and under the false ceiling or duct in
an air-conditioned room shall not be less than 2.44 m. The minimum clear distance between the floor below
and the soffit of a beam shall not be less than 2.15 m.
(c) The requirements of ceiling height for buildings of occupancy other than residential and business and
mercantile shall be as follows:
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Table 3.1.9: Minimum Ceiling Heights for Different Occupancies
Occupancy Minimum Ceiling Height
Educational, Institutional, Health Care, 3 m for non-air-conditioned and 2.6 m for air-
Assembly. conditioned buildings.
Industrial, Storage, Hazardous. 3.5 m for non-air-conditioned and 3.0 m for air-
conditioned buildings.
1.14.2.2 Room sizes
All habitable rooms used for sleeping and other purposes of a dwelling unit shall not be less than 9.5 m² of net
floor area with a minimum width of 2.9 m and shall comply with indoor air quality requirement as per provisions
of this Code. Other non-habitable rooms in the dwelling unit shall have a minimum area of 5 m² with a minimum
width of 2 m.
1.14.3 Kitchen
1.14.3.1 The minimum clear height of kitchen measured from the finished surface of the floor to the finished
ceiling shall be 2.75 m, except for any floor trap of the upper floor which shall have a minimum clearance of 2.15
m above the finished floor. The minimum clear height of kitchen shall be 2.15 m where mechanical exhaust is
installed.
BNBC 2015 FINAL DRAFT
1.14.3.2 The minimum floor area of kitchen without provision for dining shall be 4 m² with a minimum width of
1.5 m. The minimum floor area of a kitchen which is intended to provide dining or occasional sleeping space shall
be 7.5 m² with a minimum width of 2.2 m.
1.14.3.3 Every kitchen shall be provided with a kitchen sink or other means for washing utensils. The waste
water shall be discharged into the waste water pipe or drain as per provisions of Part 8.
1.14.3.4 The floor of the kitchen shall be slip-resistant and water tight.
1.14.3.5 Every kitchen shall be provided with window having a minimum area of 1 m² which shall open to the
exterior or to an interior open space of adequate dimensions complying with Sec 1.19.
1.14.3.6 It is recommended that all kitchens should be designed as accessible kitchens for people with disability
considering the door width, accessible route, turning clearance within the kitchen, counter heights, placement of
fixtures, knee and toe clearances under counters and other relevant criteria in compliance to the guidelines of
Appendix D.
1.14.4 Bathroom and Toilets
1.14.4.1 The height of any bathroom, toilet or water closet shall not be less than 2.15 m measured from the
finished floor surface to the finished ceiling or false ceiling or to the lowest point of any trap of the upper floor's
plumbing system.
1.14.4.2 The minimum requirement of floor area and width of a bathroom with 3 fixtures, 2 fixtures or single
fixture shall conform to the space standards of Table 3.1.10.
1.14.4.3 Details for requirement of adaptable or accessible toilets shall follow the guidelines of Appendix D.
Table 3.1.10: Bathroom Space Standards Minimum Width (m) Floor Area (m2)
Facility 1.25 3.00
Water closet + bathing + hand washing
Water closet + bathing 1.00 2.80
Bathing only 1.00 1.50
Water closet only 1.00 1.20
Adaptable toilets 1.50 as per Appendix D
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General Building Requirements, Control and Regulation
1.14.4.4 No bathroom or toilet containing water closet shall open directly into any kitchen or cooking space by
a door, window, ventilator, fanlight or any other opening. Every such bathroom or toilet shall have a door
completely shutting it off from the exterior.
1.14.4.5 Every bathroom, toilet and water closet shall be located against an exterior wall or wall on the interior
open space (see Sec 1.8.10), except where they are ventilated through an interior lighting and ventilation shaft.
Such interior lighting and ventilation shafts shall have the minimum dimensions specified in Table 3.1.11 for
different heights of buildings. In addition, shafts for buildings exceeding 6 storeys or a height of 20 m shall be
mechanically ventilated. All shafts must be accessible at the ground floor level for cleaning and servicing purposes.
Table 3.1.11: Minimum Dimensions of Lighting and Ventilation Shaft
Building Height Minimum Net Cross Minimum Width
Sectional Area of Shaft of Shaft
No. of Stories Height (m)
(m2) (m)
Up to 3 Up to 11 1.50 1.00
4 14 3.00 1.20
5 17 4.00 1.50
6 20 5.00 2.00
BNBC 2015 FINAL DRAFT
Over 6* Over 20 6.50 2.50
* Mechanical ventilation of the shaft shall be provided for buildings over 6 stories high.
Shaft dimensions shall conform to mechanical design considerations.
1.14.4.6 Floors of bathrooms, toilets or water closets shall be treated with water repellent material and shall be
water tight. All bathroom walls or partitions shall be treated with non-absorbent water repellent smooth
impervious finish material to a height of not less than 1 m above the finished floor level. The floor shall be sloped
gently towards gratings or openings of the floor traps.
1.14.4.7 All public buildings shall have adaptable toilet as per requirement of the development authorities
having jurisdiction. Each dwelling unit shall have at least one adaptable toilet. The details of such toilet shall
comply with requirements of Appendix D (Universal Accessibility).
1.14.5 Stairways
1.14.5.1 Limiting Dimensions
The minimum width of the staircase for various occupancies shall be as specified in Table 4.3.6 of Part 4.
1.14.5.2 Sum of two risers and one tread excluding nosing dimension shall not be less than 610 mm and not
more than 648 mm. All Risers and Treads shall be identical in consecutive two flights starting from one floor to
another floor. Difference between two consecutive risers or treads shall not be more than 5 mm. The combination
of riser and treads shall comply with Table 4.3.4 Chapter 3, Part 4.
1.14.5.3 The maximum flight height between landings shall not be more than 3660 mm. For Assembly occupancy
maximum flight height between landings shall not be more than 2440 mm.
1.14.5.4 The minimum clear head room between flights of a staircase shall be 2.15 m. The clear head room may
be reduced to 2.03 m for not more than three flights in any staircase.
1.14.5.5 The minimum clear height of any passage below a landing providing access to non-habitable and service
spaces shall be 2.03 m. The minimum clear height of all other passages and spaces below a landing shall be 2.15
m.
1.14.5.6 Handrails shall have a minimum height of 0.9 m measured from the nose of stair to the top of the
handrail.
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1.14.6 Mezzanine FloorBNBC 2015 FINAL DRAFT
1.14.6.1 Each mezzanine floor area in a space shall not exceed one-third of the main floor area. The area of the
mezzanine shall be included in calculating the FAR.
1.14.6.2 The clear headroom both over and under the mezzanine floor shall be at least 2.2 m.
1.14.6.3 The lighting and ventilation of the space both over and under the mezzanine floor shall not be
obstructed in any way.
1.14.7 Lofts
1.14.7.1 Space under slope roof termed lofts shall not be used as a habitable space where minimum ceiling
height is less than the requirement but more than 1.5 m.
1.14.7.2 The minimum ceiling height requirements for various rooms specified under Sections 1.14.2.1, 1.14.2.2,
1.14.3 and 1.14.4 shall be maintained under the loft.
1.14.7.3 A maximum of 25% of the floor area of any room may be covered by a loft, except bathrooms, toilets,
water closets, store rooms and corridors where the whole area may have an overhead loft.
1.14.7.4 The loft shall not interfere with the lighting and ventilation of any room.
1.14.8 Cabins or Chambers
1.14.8.1 Cabins or Chambers created by removable partitions on open floor shall have a minimum area of 3m2.
1.14.8.2 Clear passages at least 0.75 m wide (or as stipulated in Part 4) shall be maintained between the cabins
leading to a means of exit which shall in no case be further than 16 m from any cabin.
1.14.8.3 A clear gap of at least 300 mm shall be maintained between the top of the partition walls enclosing the
cabin and the ceiling, unless the cabin is exposed to the exterior deriving natural light and ventilation or is
artificially lighted and ventilated.
1.14.9 Store Room
A store room provided in a dwelling unit of a residential building shall have a minimum area of 1.5 m2 with a
minimum width of 1 m. The clear height of the store room shall not be less than 2.2 m.
1.14.10 Private Garage
Private garage in residential occupancy A1 and A2 building shall have a minimum clear height of 2.03 m. The
minimum area of the parking stall in a garage shall be decided in accordance with the provision of Sec F.7.1 of
Appendix F.
1.14.11 Basement
Any underground floor of a building wholly or partially below formation level shall be called a basement and shall
satisfy the requirements of the following sections.
1.14.11.1 Subject to the provision of Sec 1.9.3.3, the area of the basement shall be included in the calculation of
FAR.
1.14.11.2 The walls and floors of the basement shall be damp-proof and water-proof as per provision of this Code.
The basement shall be protected against surface and sub-surface waste water intrusion.
1.14.11.3 The basement shall be lighted and ventilated as per provision of this Code.
1.14.11.4 The staircases of a building serving above grade level also entering into below street floor level shall be
enclosed by barrier wall with two door smoke proof vestibule shall have minimum 2 hours fire resistance time.
1.14.11.5 Ramp provided as walkways shall not be steeper than 1 vertical in 8 horizontal.
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1.14.11.6 The clear height of the basement below soffit of beams shall not be less than 2.03 m.
1.14.12 Entrance to the Building
All buildings shall have a covered entrance or other covered area for callers waiting at the door. The main entrance
door to the building shall not open into an uncovered exterior. All public buildings shall have universal accessibility
as per provisions of Appendix D of Part 3.
1.14.13 Roof Drainage
1.14.13.1 The roof of a building shall be constructed in such a manner that rain water is drained freely away from
the building without causing dampness of the roof or the walls of the building or of an adjacent building.
1.14.13.2 Water from the roof shall not be discharged into the adjacent property or street.
1.14.13.3 For one or two storied buildings with flat or pitched roof, rain water may be discharged directly to the
ground, in which case the roof shall have extended eaves or cornices to direct the water away from the walls.
1.14.13.4 For other buildings, gutters or parapets shall be provided to direct the water to the piping of an
adequate rain water drainage system.
1.14.13.5 The roof shall be impermeable or shall be treated with an impervious material to make it effectively
water tight. Flat concrete roofs shall be topped with an impervious layer of lime concrete or other effective means
of waterproofing. All flat roofs shall be sloped gently towards gutters, gratings or mouths of the rain water
drainage pipes.
1.14.13.6 For sustainable development, building may have rain water harvesting system as stipulated in Part 8,
Chapter 7.
1.14.14 Parapet
All accessible flat roofs shall be enclosed by parapets or guardrails having a height of at least 1 m. All such parapets
and guardrails shall be designed to withstand the lateral forces due to wind and occupancy in conformity with the
provisions of Part 6 of this Code.
1.14.15 Septic Tank
A septic tank shall be provided within the premises for disposal of sewage, whether any public sewer is available
or not. The location, design and construction of the septic tank shall conform to the requirements of this Code.
1.15 LANDSCAPING
1.15.1 Plantation of trees and shrubs within the open spaces of a plot aimed at enhancing the environmental
quality of the building shall comply with the requirements of this Section.
1.15.2 Trees and shrubs shall be planted judiciously to meet the requirements of shade and sunshine, to control
noise and dust, to provide privacy and to improve visual quality, without jeopardizing natural ventilation and
lighting of a building.
1.15.3 Species of trees shall be so chosen and planted that their roots do not endanger the building foundation
and their branches do not interfere with the building superstructure. This shall be achieved by maintaining
sufficient distance between the trees and the building depending on the species of the tree.
1.16 DAMP-PROOFING AND WATERPROOFING OF FLOORS AND WALLS
Foundation, floor slabs, walls and roof of a building shall be damp proof, water proof and weather proof in
accordance with the provisions of Part 6 of this Code.
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General Building Requirements Chapter 1
1.17 EXISTING BUILDINGS
1.17.1 Existing buildings and structures in their present occupancy condition shall not be required to be in full
compliance with all the requirements of this Part of this Code. Additions or alterations to such existing buildings
or change of use thereof shall not be permitted if such addition, alteration or change of use or occupancy is likely
to render the building more hazardous with respect to fire safety, life safety and sanitation than it was before.
1.17.2 Any horizontal or vertical extension of an existing building or any change of use thereof shall subject the
altered building or occupancy to the provisions of this Code for a new building. The building together with the
additions and changes shall not exceed the height, area and open space requirements for new buildings specified
in this Code.
1.17.3 All buildings and structures, both new and existing shall be maintained in a safe and sanitary condition
as provided for in this Code. To determine compliance with this requirement, the Authority may cause the
building or structure to be periodically inspected.
1.17.4 Any proposed change in an existing building or structure shall have to satisfy the requirements set forth
in Part 6 of this Code.
BNBC 2015 FINAL DRAFT
1.18 BUILDINGS AND AREAS OF HISTORICAL OR ARCHITECTURAL VALUE
1.18.1 Buildings and areas of Historical value are part of our heritage and cultural inheritance and should
therefore be protected. Similarly buildings and works under the jurisdiction of and identified by the Authority as
having architectural value shall also be protected. The identification, listing and classification of all such buildings
and places of historic or architectural values shall follow the guidelines of Chapter 3 of Part 9, Section 1.5 of Part
1 and Section 3.14 of Part 2.
1.18.2 Repairs, alterations and additions necessary for the preservation, restoration, rehabilitation, continued
use or adaptive reuse of such historic buildings and structures, and of buildings and works of architectural value
may be exempted by the Authority from having to be in full compliance with all the requirements of this Code,
provided that the restored building or structure will be no more hazardous, if any, than the existing conditions in
terms of life safety, fire protection and sanitation. All such buildings and places shall comply with the provisions
for conservation of heritage buildings or area of Part 9.
1.19 VENTILATION, LIGHTING AND SANITATION
1.19.1 All rooms and interior spaces designated for human occupancy shall be provided with means of natural
or artificial lighting and natural or mechanical ventilation as per provisions of this Code. At least one side of all
habitable rooms shall be exposed to an exterior or an interior open space or to a balcony or verandah exposed to
an open space.
1.19.2 All buildings shall have water and sanitation facilities as per provisions of this Code.
1.19.3 Every kitchen shall have facility for washing of utensils.
1.19.4 Every building or independent unit thereof shall be provided with at least one water closet.
1.19.5 All naturally ventilated and illuminated interior spaces, staircases and other areas of human occupancy
in a building shall have windows or ventilators opening directly to the exterior or an interior open space or to a
verandah. Ventilation of bathrooms may also be achieved through ventilation shafts as provided for in Sec
1.14.4.5.
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1.19.6 All habitable and non-habitable spaces within a building shall have the following minimum aggregate
area of openings in the exterior wall, excluding doors, expressed as percentage of the net floor area:
Table 3.1.12: Dimension of Openings for Different Uses
Space Percent of Net Floor Area
Habitable rooms such as those used for 15
sleeping, living, study, dining etc.
Kitchens* 18
Non-habitable spaces such as bathrooms, 10
store, staircase and other utility
* Minimum height from of the window sill of a kitchen shall be 450mm above
cooking range. Air flow on cooking range shall be restricted.
1.19.6.1 An enclosed staircase shall have windows not less than 1 m² in area on exterior walls of every landings
as per provisions of this Code.
1.19.6.2 Toilet and bathroom windows shall open to the exterior or an approved ventilation shaft and the
operable area shall not be less than 1 m².
1.19.7 The required minimum average intensity of illumination in a habitable space at a height of 750 mm above
the floor level shall be 65 lux. Any point in a room more than 7 m away from an exterior window shall be
considered to be not illuminated by daylight unless measurement of illumination gives an intensity of 65 lux or
more.
BNBC 2015 FINAL DRAFT
1.19.7.1 The required intensity of illumination for various tasks in a building shall be as specified in Chapter 1 of
Part 8.
1.19.7.2 Whenever the illumination achieved by daylight is not sufficient or occupancy at night is necessary,
artificial lighting shall be installed to supplement daylight, or to provide the required night lighting, in accordance
with the provisions of Chapter 1 of Part 8.
1.19.8 Protected openings, when and where are installed shall not be normally operable form the inside of a
building. Such openings however, shall not be credited towards meeting any ventilation requirements.
1.19.9 The requirements of opening areas specified in Sec 1.19.6 shall suffice for ventilation provided that the
windows or ventilators forming the opening are operable. When part of a window area is made of fixed glazing,
only the operable portion shall be counted in aggregating the opening area.
1.19.9.1 To achieve the desired indoor air quality by natural means, an interior space shall preferably have
minimum two openings on two different walls where the opening acting as inlet must be an exterior wall and the
summation of the net opening area on walls shall not be less than 5% of the net floor area thereof.
1.19.9.2 Mechanical ventilation, when provided, shall conform to the requirements of Chapter 3 of Part 8.
1.20 AIR-CONDITIONING AND HEATING
When air-conditioning and heating system are installed, an indoor air quality shall be maintained as per provisions
of Chapter 3 Part 8.
1.21 PROVISION OF LIFTS AND ESCALATORS
Wherever required by this Code or desired by the owner for comfort, lifts and escalator facilities shall be planned,
designed and installed in accordance with the provisions of Part 4 and Part 8 of this Code. The minimum size of a
lift lobby shall be 1.5 m x 1.5 m. For accessible lift guidelines of Appendix D shall be applicable.
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1.22 SOUND INSULATION
Acoustical design of a building to attain the desired noise levels shall be performed in accordance with the
provisions of Chapter 4 Part 8.
1.23 THERMAL INSULATION
Thermal comfort in a building shall be achieved through adequate ventilation and thermal insulation of walls and
roof.
1.24 LIGHTNING PROTECTION OF BUILDINGS
Lightning protection measures shall be installed on all buildings whose exposure conditions indicate the likelihood
of lightning strike and consequential hazard to life and property. The requirement of lightning protection systems
shall be assessed and they shall be designed and installed in accordance with the provisions of Chapter 2 Part 8.
BNBC 2015 FINAL DRAFT
1.25 RAT PROOFING AND TERMITE PROOFING OF BUILDINGS
Rat proofing and termite proofing measures shall be undertaken on the basis of the degree of protection desired
from rats and termites. Any chemical used for the control of rats and termite shall be free from environmental
hazards. Periodic inspections shall be undertaken for effective protection against rats and termites.
1.26 REQUIREMENTS FOR BUILDINGS IN FLOOD PRONE AND COASTAL REGIONS OF
BANGLADESH
The specifications of this Section shall be applicable to all buildings located in the flood or surge prone areas in
addition to other requirements of this Code.
(a) The planning and development control authority of the city, township, municipality or region where this
Code is intended to be applied shall delineate any area having a potential for being flooded under at least
1 m deep water due to flooding as Flood Prone Area (FPA). The provisions of Sec 1.26.1 shall be applicable
to areas designated as FPA. There shall be a design flood level in the FPAs which shall be recommended
by the Authority to be used in interpreting the provisions of this Section.
(b) Similar delineation shall be made in the coastal regions on the basis of expected occurrence of a surge or
wave run-up of 1 m or higher. Such areas shall be designated as Surge Prone Area (SPA). The provisions
of Sec 1.26.2 shall be applicable to buildings located in the SPAs. There shall be a design surge height in
the SPAs which shall be recommended by the Authority to be used in interpreting the provisions of this
Section.
1.26.1 Flood Prone Areas
1.26.1.1 Elevation
The habitable floors of a building located in the flood prone area shall be elevated above the design flood level.
Buildings up to two storeys high shall have accessible roof with an exterior stair. Buildings having three storeys or
more height, the floor immediately above the design flood level shall be accessible with an exterior stair.
Exceptions:
(a) Except for Occupancy A (Residential), any occupancy may have floors below the design flood level in
accordance with the provisions of Sec 1.26.1.3.
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(b) Floors which are used only for building access, exits, foyers, storages or parking garages may be located
below the design flood level in accordance with the provisions of Sec 1.26.1.2.
1.26.1.2 Enclosures below design flood level
There shall be no enclosed space below the design flood level except for building access, exits, foyers, storage,
and parking garages. There shall be vents, valves or other openings in the walls of the enclosed spaces which shall
equalize the lateral pressure of the water. The bottom of such openings shall not be higher than 300 mm above
the finished grade. There shall be at least two openings for each enclosure in a building. The total net area of
openings for an enclosure shall be at least 0.4 m2, or 7 percent of the floor area of the enclosure, whichever is
greater.
1.26.1.3 Flood-resistant Construction
Floors constructed below the design flood level under the provisions of Exceptions in Sec 1.26.1.1 shall comply
with the following requirements:
(a) Floors and exterior walls of such floors shall have a construction impermeable to the passage of water.
(b) Structural components of such floors shall be capable of resisting the hydraulic and buoyant forces
resulting from the occurrence of floods at the design flood level. Design requirements in such cases are
specified in Chapter 1, Part 6.
(c) Vents, openings and valves provided below the design level shall have water-tight closures capable of
resisting any structural forces resulting from the occurrence of the design flood.
(d) Penetrations made for electrical, mechanical or plumbing installations shall be made water-tight to
prevent any penetration of flood water. Sewerage systems having opening below the design flood level
shall have a closure device to prevent backwater flow during the occurrence of floods.
1.26.2 Surge Prone Areas
1.26.2.1 Elevation
The habitable floor of any building in a surge prone area shall not be located below the design surge height. For
buildings of height two storeys or less the roof shall be accessible with an exterior stair. For buildings three storeys
or higher, the floor immediately above the design surge level shall be accessible with an exterior stair.
Exception:
Footing, mat or raft foundations, piles, pile caps, columns, grade beams and bracings may be constructed below
the design surge height.
1.26.2.2 Enclosures below Design Surge Height:
Spaces of a building in the SPAs below the design surge height shall not obstruct any flow of water during the
occurrence of surge.
Exception:
Structural or non-structural members serving as entries or exits may be constructed below design surge height.
1.26.2.3 Foundations
Foundations of the buildings erected in the SPA's shall be located well below the ground level so that they are
protected from erosion or scour during the occurrence of surge. If piled foundations are used, they shall be
designed to withstand with adequate factor of safety the loss of support due to scour. Design of the foundations
shall conform to the requirements of Chapter 3 Part 6.
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1.27 REQUIREMENTS FOR BUILDINGS IN OTHER DISASTER PRONE AREAS
In hilly region, authority shall ask for a special site drainage plan conforming to the area drainage network before
approval of any building work. This shall apply for all buildings to be constructed in hilly areas where there is the
danger of failure of slopes, including mudslides, flash floods and soil erosion. Such failures may occur in hilly areas,
where the angle of slope is greater than 300. Prevention of failure of slopes shall be achieved by the following
measures:
(a) Retaining walls to prevent soil erosion as per provisions of Part 6 of this Code.
(b) Weep holes to allow water pressure balancing from the water logged soil on the retaining wall.
(c) Adequate site drainage respecting the natural topography of the site and surrounds.
(d) Use of vegetation to retain the top soil and bonding quality of the soil.
(e) Protection of soil by catchment pools to prevent soil erosion due to discharge from elevated level onto
the ground.
1.28 SPECIAL PROVISION FOR STORAGE OF DANGEROUS GOODS AND THEIRBNBC 2015 FINAL DRAFT
CLASSIFICATION
1.28.1 Any substance including mixtures and solutions shall be assigned to one of the following Classes for any
Occupancy if it crosses the limits of exempted quantities as per Table 3.2.5 of Part 3, Section 2. Some of these
classes are subdivided into divisions also. The numerical order of the classes or divisions is not the representative
of the degree of danger. These classes including their divisions are listed below:
Class 1: Explosives
Division 1.1: Substances and articles which have a mass explosion hazard.
Division 1.2: Substances and articles which have a projection hazard but not a mass explosion hazard.
Division 1.3: Substances and articles which have a fire hazard and either a minor blast hazards or a minor
projection hazards, but not a mass explosion hazard.
Division 1.4: Substances and articles which present no significant hazard.
Division 1.5: Very insensitive substances which have a mass explosion hazard.
Division 1.6: Very insensitive substances which do not have a mass explosion hazard.
Class 2: Gases
Division 2.1: Flammable gases
Division 2.2: Non-flammable, non-toxic gases
Division 2.3: Toxic gases
Class 3: Flammable Liquids
Class 4: Flammable Solids; Substances Liable to Spontaneous Combustion; Substances which, in contact with
Water, Emit Flammable Gases:
Division 4.1: Flammable solids, self-reactive substances and solid
Division 4.2: Substances liable to spontaneous combustion
Division 4.3: Substances which, in contact with water, emit flammable gases
Bangladesh National Building Code 2015 3-27
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Class 5: Oxidizing Substances and Organic Peroxides
Division 5.1 Oxidizing substances
Division 5.2 Organic peroxides
Class 6: Toxic and Infectious Substances
Division 6.1: Toxic substances
Division 6.2: Infectious substances
Class 7: Radioactive Material
Class 8: Corrosive Substances
Class 9: Miscellaneous Dangerous Substances and Articles
The quantity and procedure for storage, merchandising, handling, processing, packaging, transportation,
shipment and uses of all dangerous goods of above classification shall be regulated as per guidelines of Explosive
Act and other relevant Acts and as per rules of Bangladesh Shipping Corporation for safe handling of container for
dangerous goods. The signs and symbols for all such goods shall comply with the requirements of Bangladesh
Shipping Corporation’s guidelines.
1.28.2 HS Code, Proper Shipping Names and UN Numbers
First Schedule of Bangladesh customs tariff that is Harmonized System code shall be used for the description of
any substances and its corresponding UN number shall be used for proper shipping name and for the
classifications of dangerous goods. The storage and use of all such substances and goods shall be controlled as
per provision of this Code and explosive control act.
BNBC 2015 FINAL DRAFT
1.29 LIST OF RELATED APPENDICES
Appendix A Development Control and Planning
Appendix B Minimum Standard Housing
Appendix C Cluster Planning
Appendix D Universal Accessibility
Appendix E Building Types
Appendix F Road Hierarchy, On-street and Off-street Parking
3-28 Vol. 1
Chapter 2
CLASSIFICATION OF BUILDINGS BASED ON
OCCUPANCY
2.1 OCCUPANCY CLASSIFICATION
2.1.1 Every building or portion thereof and land-use shall be classified according to its use or the character of
its occupancy as a building of Occupancy A, B, C, D, E, F, G, H, I, J, K, L or M as defined below:
Occupancy A:BNBC 2015 FINAL DRAFTResidential
Occupancy B: Educational
Occupancy C: Institution for care
Occupancy D: Health Care
Occupancy E: Business
Occupancy F: Mercantile
Occupancy G: Industrial
Occupancy H: Storage
Occupancy I: Assembly
Occupancy J: Hazardous
Occupancy K: Garages
Occupancy L: Utilities
Occupancy M: Miscellaneous
2.1.2 Utilities under Occupancy L is incidental to operation in all other type of occupancy except Occupancy J
shall be considered as non-separated use of the main occupancy but shall be taken special safety measure as per
provision of this Code.
2.1.3 Any occupancy or use type not mentioned specifically in Table 3.2.6 (A-Z list) or elsewhere in this Code
shall be classified by the Board of Appeals under the occupancy group to which its use most closely resembles,
considering the life safety and fire hazard.
2.1.4 Each occupancy group shall be subdivided as detailed in the following sections. The detail classification
including mixed occupancy provided in the Table 3.2.6 (A-Z list) is non-exhaustive. If there is any use or character
of occupancy in a building which is not mentioned here, it shall be classified as per provision of Sec 2.1.3 of this
Chapter.
2.1.5 Occupancy A: Residential Buildings
This occupancy type shall include any building or portion thereof providing sleeping and living accommodations
to related or unrelated groups of people, with or without independent bathroom, cooking or dining facilities,
except any building classified under Occupancy C or D. This Occupancy shall be subdivided as follows:
Part 3 3-29
General Building Requirements, Control and Regulation
BNBC 2015 FINAL DRAFTPart 3
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2.1.5.1 Single Family Dwelling (A1)
These shall include any building, row type or semi-detached or detached from neighboring buildings by distances
required by this Code and having independent access to the plot, which is used as private dwelling by members
of a single family.
2.1.5.2 Two Family Dwelling (A2)
These shall include any building, row type or semi-detached or detached from neighboring buildings by distances
required by this Code and having shared or independent access for two families and having facilities for living,
cooking and bathroom facilities independent of each other.
2.1.5.3 Flats or Apartments (A3)
These shall include any building or portion thereof which is provided for more than two families, having facilities
for living, cooking and bathroom facilities independent of each other.
2.1.5.4 Mess, Boarding Houses, Dormitories and Hostels (A4)
These shall include any building or portion thereof in which sleeping, living accommodations and bathroom are
provided for groups of related or unrelated persons, with or without common dining and facilities, and with
common cooking under single management control or with individual or group cooking facilities.
2.1.5.5 Hotels and Lodging Houses (A5)
These shall include any building, a portion thereof or group of buildings under single management, in which
sleeping, living accommodation and bathroom facilities are provided with or without dining facilities but without
cooking facilities for adult individuals, is provided for hire on transient or permanent basis.
2.1.6 Occupancy B: Educational Facilities
This occupancy type shall include any building or portion thereof in which education, training and care are
provided to children or adults. This Occupancy shall be subdivided as follows:
2.1.6.1 Educational Facilities up to Higher Secondary Level (B1)
These shall include any building or portion thereof used for purposes involving assembly for instruction, education
and recreation of more than six persons on regular basis to fulfill the requirement of an academic curriculum
approved by the Government up to Higher Secondary (12th Grade), and which is not covered by occupancy I.
2.1.6.2 Facilities for Training and for Above-Secondary Level (B2)
These shall include any building or portion thereof used for purposes involving assembly for instruction,
education, training and recreation of more than six persons, and which is not covered by occupancy I and B1.
2.1.6.3 Pre-School Facilities (B3)
These shall include any building or portion thereof used for purposes involving care, recreation and education of
children more than six in number, who have not yet reached the age to attend the school.
2.1.7 Occupancy C: Institution for Care
Buildings classified under this occupancy shall include those used for purposes of institutional care of the
occupants, such as detention for correctional or penal purposes, medical or nursing care of persons suffering from
illness or infirmity due to mental condition, or accommodation of children or minor, where the personal liberty
of the inmate is restricted. These buildings shall ordinarily provide accommodation for sleeping, dining and other
provisions approved by the authority for the occupants. This occupancy shall be subdivided as follows:
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Classification of Buildings Based on Occupancy Chapter 2
2.1.7.1 Institution for Care of Children (C1)BNBC 2015 FINAL DRAFT
These shall include any building or portion thereof or group of buildings under single management used as an
institution for the full time care of children or minor, each providing accommodation for sleeping, dining and
other provisions approved by the authority for more than six children.
2.1.7.2 Custodial Institution for Physically Capable Adults (C2)
These shall include any building or portion thereof or group of buildings under single management used for
purposes of full time care and custody of adult or mentally disabled persons but physically capable of responding
to emergency.
2.1.7.3 Custodial Institution for the Incapable Adults (C3)
These shall include any building or portion thereof or group of buildings under single management used for
purposes of full time care and custody of persons physically or mentally incapable of responding to emergency.
2.1.7.4 Penal and Mental Institution for Children (C4)
These shall include any building or portion thereof or group of buildings under single management used for
housing children under restraint, or who are detained for penal and corrective purposes, in which personal liberty
of the inmates is restricted.
2.1.7.5 Penal and Mental Institution for Adults (C5)
These shall include any building or portion thereof or group of buildings under single management used for
housing persons under restraint, or who are detained for penal and corrective purposes, in which personal liberty
of the inmates is restricted.
2.1.8 Occupancy D: Health Care Facilities
Buildings under this Occupancy group shall include those used for purposes of providing medical care, diagnostic
facilities and treatment to persons suffering from physical discomfort, in which sleeping accommodation may or
may not be provided. This Occupancy shall be subdivided as follows:
2.1.8.1 Normal Medical Facilities (D1)
These shall include any building or portion thereof or group of buildings under single management in which
essential medical facilities having surgery, emergency and casualty treatment facilities, general or specialized
medical and other treatment is provided to persons suffering from physical discomfort.
2.1.8.2 Emergency Medical Facilities (D2)
These shall include any building or portion thereof used for purposes of providing essential medical facilities
having surgery, emergency, casualty treatment facilities, general or specialized medical and other treatment is
provided to persons suffering from physical discomfort. This Type shall be equipped and designated to handle
post disaster emergency, by construction it is required to remain operational during and after disasters, built as a
part of disaster preparedness program.
2.1.9 Occupancy E: Business
These shall include any building or portion thereof which is used for any business transaction other than
mercantile. This Occupancy shall be subdivided as follows:
2.1.9.1 Office (E1)
These shall include any building or part thereof which is used for paper works, documentations, only display of
samples of Products but not for direct sale, maintaining accounts and records for administrative or consulting
services, banking or activities for business purposes and professional training.
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2.1.9.2 Research and Testing Laboratories (E2)
These shall include any building or portion thereof which is used as research establishment and/or test laboratory
involving hazardous materials within the limit of exempted quantity permitted in this Code.
2.1.9.3 Essential Services (E3)
These shall include any building or portion thereof used for purposes of providing emergency services and utilities
which are required to remain operational during and after a disaster or other emergency situations.
2.1.10 Occupancy F: Mercantile
This occupancy type shall include any building or portion thereof or group of buildings which is used for display
and sale of merchandises. This Occupancy shall be subdivided as follows:
2.1.10.1 Small Shops and Market (F1)
These shall include any building or portion thereof with an area divided or undivided not exceeding 300 m², used
for purposes of display and sale of merchandise, either wholesale or retail, with or without incidental storage and
service facilities.
2.1.10.2 Large Shops and Market (F2)
These shall include any building or portion thereof with an area divided or undivided more than 300 m² used for
purposes of display and sale of merchandise, either wholesale or retail, with or without incidental storage and
service facilities.
2.1.10.3 Refueling Station (F3)
These shall include any building or portion thereof used for providing refueling and maintenance without repair
services for automobiles which is moderately hazardous in nature.
2.1.11 Occupancy G: Industrial Buildings
Buildings under this Occupancy shall be subdivided on the basis of hazard potential of the contents and the
processes of the industry. The hazard shall generally mean the relative danger of the start of fire and the rapidity
of its spread, the danger of smoke and gases generated that pose a potential threat to the safety of the occupants
of the building. Unless areas with different degrees of hazard are effectively segregated and separated in
accordance with the provisions of this Code, the most hazardous area in a building shall govern its classification.
This occupancy shall also include facilities for public utility services at the producer or distributor’s end that deals
with generation and distribution of utility facilities. Any such building or portion thereof, which is not using
hazardous material quantified and categorized in occupancy group J, shall be subdivided as follows:
2.1.11.1 Low Hazard Industry (G1)
These shall include any industrial building in which the contents are of such low combustibility and the processes
conducted therein are of such low hazardous nature that danger of self-ignition and self-propagation of fire is
nonexistent, the only danger being an onset of fire from external sources with the resulting danger to life and
property.
2.1.11.2 Moderate Hazard Industry (G2)
These shall include any industrial building in which the contents are moderately combustible and the industrial
processes conducted therein are liable to give rise to a fire which will spread with moderate rapidity, giving off
considerable smoke.
2.1.12 Occupancy H: Storage Buildings
Buildings under this Occupancy group shall include any building or portion thereof used primarily for storage or
sheltering of goods, wares, merchandises, vehicles or animals. Any such building or portion thereof, which is not
used for storing hazardous material quantified and categorized in occupancy group J, shall be subdivided as
follows:
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2.1.12.1 Low Fire-risk Storage (H1)BNBC 2015 FINAL DRAFT
These shall include any building or portion thereof which is used for storage of materials or other contents which
do not constitute the danger of self-ignition, and in the event of fire the rate of burning shall be less than moderate
rapidity.
2.1.12.2 Moderate Fire-risk Storage (H2)
These shall include any building or portion thereof which is used for storage of materials which do not constitute
the danger of self-ignition but which in the event of fire will burn with moderate rapidity.
Items which shall be deemed to render a building hazardous are specified in Sec 2.14.3along with the exempted
amount for each item.
2.1.13 Occupancy I: Assembly
Buildings under this Occupancy group shall include any building or portion thereof in which groups of people
congregate or assemble for recreation, amusement, social, religious, political, cultural, travel and similar
purposes. This Occupancy shall be subdivided as follows:
2.1.13.1 Large Assembly with Fixed Seats (I1)
This occupancy shall include a building or a portion thereof for assembly in a space provided with fixed seats for
1000 or more persons. Assembly buildings under this subdivision may be for theatrical, operatic performances or
cinema projection having or not a raised stage, proscenium curtains, scenery loft or projection screen, lighting
equipment, projection booth and necessary theatrical and mechanical equipment.
2.1.13.2 Small Assembly with Fixed Seats (I2)
This occupancy type shall include any building or portion thereof primarily meant for use as described for buildings
under Occupancy I1, but with fixed seats for less than 1000 persons in a space. These assembly buildings may or
may not be provided with a legitimate theatrical stage or related accessories or equipment.
2.1.13.3 Large Assembly without Fixed Seats (I3)
This occupancy type shall include any building or portion thereof for assembly in a space, in which there are no
fixed seats, which may or may not be provided with a legitimate stage or theatrical accessories, and which has
accommodation for 300 or more persons.
2.1.13.4 Small Assembly without Fixed Seats (I4)
This occupancy type shall include any building or portion thereof primarily intended for use as described in
Occupancy I3, but with accommodation for less than 300 persons in a space.
2.1.13.5 Sports Facilities (I5)
This occupancy type shall include any building or portion thereof meant for assembly of spectators for recreational
and amusement purpose mainly related to sports.
2.1.14 Occupancy J: Hazardous Buildings
Any Building or portion thereof used as storage, industrial, research and other facilities dealing with hazardous
material in excess of exempted quantity defined in the Table 3.2.5 or any micro-biological facilities shall be
categorized in this Occupancy group.
Definition of hazard and the amount of such materials which shall be deemed to render a building hazardous are
set forth in Sec 2.14.3. This Occupancy shall be subdivided as follows:
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2.1.14.1 Explosion Hazard Buildings (J1)
These shall include any building or portion thereof which is used for storage, handling, processing or manufacture
of explosive materials and products that have explosion hazard.
2.1.14.2 Chemical Hazard Buildings (J2)
These shall include any building or portion thereof which is used for storage, handling, processing or manufacture
of materials and products that are highly corrosive, toxic, poisonous and physically harmful including corrosive
and toxic alkalis, acid or other liquids or chemicals, producing flame, fumes, radiation, and explosive, poisonous,
irritant and corrosive gases.
2.1.14.3 Biological Hazard Buildings (J3)
These shall include any building or portion thereof which is used for storage, handling, processing or manufacture
of materials and products that use biological processes and in which the risk of harmful biological threat to the
occupants exist.
2.1.14.4 Radiation Hazard Buildings (J4)
These shall include any building or portion thereof which is used for storage, handling, processing or manufacture
of materials and products that use nuclear and radioactive processes and in which the risk of radioactive
contamination exists.
2.1.15 Occupancy K: Garage
These occupancy types shall include any building or portion thereof used one or more vehicles having containers
of flammable liquid or compressed gas or carrying power or combination of any of these as a supply source for
self-propelling are kept for use, sale, rental purpose, storage, repair, exhibition and all those floors of a building
or portion thereof in which such vehicles are not separated by suitable cutoff to prevent fire spreading.
2.1.15.1 Parking Garage (K1)
This occupancy type shall include any building or portion thereof used solely for parking Motor Vehicles for a
limited period of time.
2.1.15.2 Private Garage (K2)
This occupancy type shall include any building or portion thereof used as store of owner's or tenant's Motor
Vehicles for private use for unlimited period of time.
2.1.15.3 Repair Garage and Showrooms (K3)
This occupancy type shall include any building or portion thereof wherein repair of electrical or mechanical system
or denting or painting works of body is performed on any type of vehicles and includes associated floor spaces
used as office, showrooms, incidental store and parking.
2.1.16 Occupancy L: Utility
This occupancy type shall include any building or portion thereof used to install any type of equipment to provide
support service to any building or portion thereof or group of buildings of all occupancy groups and with special
provisions for occupancy J.
This shall also include all public and private utility facilities of the consumer’s end that are located within the
consumer’s site and all installations are required special care to ensure life and property safety as per provisions
of this Code.
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2.1.17 Occupancy M: MiscellaneousBNBC 2015 FINAL DRAFT
Buildings under this Occupancy group shall include special buildings not covered in other Occupancy groups. These
Occupancies shall be subdivided as follows:
2.1.17.1 Special Structure (M1)
Any building or structure which is neither listed in the A-Z list nor covered in any occupancy group provided in this
Code but unique in character may be categorized in this occupancy by the Board of Appeals. Each and every
individual M1 Structure shall be complied with NFPA or equivalent standards for the life and fire safety.
2.1.17.2 Fences, Tanks and Towers (M2)
These shall include fences and boundary walls over 1.5 m high, standalone structures for gravity water tank and
towers for telecommunication, power distribution, air-traffic control terminal or observation towers.
2.2 CHANGE OF USE
2.2.1 Without prior permission from the Authorities having jurisdiction no change shall be made in the type of
occupancy or use of any building that would place it in a different occupancy group or in a different subdivision
of the same occupancy group. Such changes shall be permitted only when the land use and the building complied
with the provisions of this Code and the laws of the land for such group of Occupancy.
2.3 MIXED OCCUPANCY
2.3.1 The following occupancies shall not be required to designate as a separated occupancy classification from
uses to which they are accessory any occupancy Group other than Occupancy Group J
(a) Assembly rooms having a floor area not more than 75 m².
(b) The administrative and clerical offices and similar offices not exceeding 25 Percent of the floor area of
the major occupancy and not related to Hazardous Buildings as defined in Occupancy J.
(c) Administrative offices, gift shops and other similar uses in Occupancy A provided the uses do not exceed
10 Percent of the floor area of the major occupancy.
(d) Kitchens associated with a dining area.
(e) Carports having at least two sides entirely open associated with Occupancy A.
2.3.2 Forms of Occupancy Separations
A building is permitted to have multiple occupancy type, each type of occupancy shall be in groups, which may
have combination of different occupancies and shall be separated horizontally or vertically or both accordingly as
specified in the Table 3.2.1.
2.3.3 Types of Occupancy Separation
The occupancy separations shall be classified as follows:
(a) Four Hour Fire Resistive: The four hour fire resistive separation wall or slab shall have no unprotected
openings therein and shall provide a fire resistance for at least three hour.
(b) Three Hour Fire Resistive: The three hour fire resistive separation wall or slab shall provide a fire
resistance of not less than three hour. The total width of all openings in separation wall of any one storey
shall not exceed 25 Percent of the length of that wall in that storey and no single opening shall have an
area greater than 12 m². The openings shall be protected with a fire resistance assembly doors or
windows providing fire resistance of at least three hour.
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(c) In case of a floor slab having three hour fire resistance rating, the openings on floor slab shall be protected
by vertical enclosures extended above and below such floor openings. The walls of such vertical
enclosures shall be at least two hour of fire resistance. All openings in such enclosures shall be protected
with fire assembly door or window having fire resistance rating of at least one and one-half hour.
(d) Two Hour Fire Resistive: The two hour fire resistive separation shall be of a construction having a fire
resistance rating of not less than two hour. All openings in such separations shall be protected with a fire
assembly door or window of a fire protection rating of at least one and one-half hour.
(e) One Hour Fire Resistive: The one hour fire resistive separation shall be of at least one hour fire protection
construction. All openings in such separations shall be protected with a fire protection assembly door or
window of at least one-half hour fire resistance.
Table 3.2.1: Fire Resistance Rating Requirements for Barrier Walls and Floor/Ceiling Assemblies between Separated Occupancies
(hours)
2.4 GENERAL REQUIREMENTS OF ALL OCCUPANCIES
2.4.1 Location on Property
2.4.1.1 All plots for building construction shall have access to a public road from at least one side.
2.4.1.2 Fire separation distance shall be measured from the face of peripheral wall of a building to the adjacent
property line. For the purpose of this Section, if a public road adjoining all along a property line shall get the
benefit of half of Road width as a part of Fire separation distance. For two or more buildings on the same plot,
distances of imaginary lines equidistant from all side of buildings shall be considered as the required fire
separation distances.
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2.4.1.3 The exterior walls of a building shall have a fire resistance and opening protection as specified in
Tables 3.3.1 (a), 3.3.1 (b) and 3.2.3.
2.4.1.4 Any outward projected elements from the peripheral wall of a building line shall be limited to the
sunshade line.
2.4.1.5 When openings in exterior walls are required to be protected due to distance from the property line,
the aggregate area of such openings shall not exceed 50 Percent of the total area of the wall in each storey.
2.4.1.6 Dwellings separation walls in semi-detached or row type development shall comply with Sec 2.4.3.
2.4.2 Allowable Floor Areas
2.4.2.1 The total area of the building shall comply with Sec 1.8.3 Chapter 1 of this Part.
2.4.2.2 The floor area of the mezzanines shall be included in the area of the respective main floor.
2.4.2.3 Floor area calculation shall be divided in to two: (a) All Floor areas at and above the formation level
which shall be generally included in the FAR calculation. (b) Floor areas below the formation level shall generally
be excluded in FAR calculation provided the Occupancy classifications remain within Utility or Private Garages.
BNBC 2015 FINAL DRAFT
Table 3.2.2: Fire Resistance Ratings in Hours of Exterior Walls for Various Occupancy Groups
Fire Separation Distance Occupancy
A1, A2, K2 , A3, A4, A5, B,C, D, E2, F3, F4, E3, H2, J
M2
E1, F1, F2, G1, I G2, H1
Up to 1.5 m 1 2 34
Greater than 1.5 m and up to 3 m N 1 23
Greater than 3 m and up to 4.5 m N N 12
Greater than 4.5 m and up to 9 m N N N1
Greater than 9 m N N NN
N= No requirements
Table 3.2.3: Requirements for Opening Protection Assembly Based on Fire Resistance Rating of Exterior Walls
Fire Resistance Ratings of Exterior Walls Fire Resistance Ratings for Opening Assembly
(in hours) (in hours)
4 Not permitted
3 3.0
2 1.5
1 0.5
N No requirements
2.4.3 Permitted Types of Construction
2.4.3.1 The types of construction for any occupancy shall conform to the specifications set in Table 3.2.4.
2.4.3.2 Common walls in semi-detached or row type development shall not have any unprotected openings
and shall be Type I-A construction and all such wall shall comply with requirements of Party wall or Fire wall or
Separation wall.
2.4.3.3 Ground floor or basement of a building used for car parking and utilities within the barriers by at least
three hour fire resistive construction shall be considered as non-separated occupancy provided the building
accommodate one or more of the following occupancies:
(i) A3, A5
(ii) E1, F1, F2
(iii) I2, I3, I4
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2.4.3.4 Entry lobbies, mechanical and electrical rooms and other similar uses incidental to the operation of the
building may be provided in the car parking floors provided that the total area of such uses remains within ⅓(one
third) of the parking floor area.
Table 3.2.4: Permitted Types of Construction and Fire Zones for Various Occupancy Groups
Occupancy Permitted Types of Construction Fire Zones
A
B
C
D Group I and Group II* 1
E1
F1,F2
I
K1, K2, M2
E2, E3, F3, K3, M1 BNBC 2015 FINAL DRAFT
G Group I or Group II* 2
H
J Group I 3
*Fire resistance rating of a building shall be credited in case of the mixed type of construction on the
basis of lower rated construction elements among the same group or same type used thereof.
2.4.4 General Provision for High-Rise Buildings
For the purpose of this Code, a building of any class of Occupancy will be considered as high-rise when it has floors
used for human occupancy located more than 33 m from ground level or the lowest level of fire department
vehicle access. The provisions of Sec 2.9.6 shall be applicable to all such buildings.
2.4.4.1 Maintenance and inspection
All fire protection systems shall be maintained and inspected on a regular basis to keep them in operative
condition. The maintenance inspection shall be performed quarterly.
All plumbing installations shall be maintained and inspected periodically to keep them in operative conditions.
2.4.4.2 Type of construction
All high-rise buildings shall be of Type I-A or I-B construction.
2.4.4.3 Fire detection, alarm, evacuation and extinguishment system
All high-rise buildings shall conform to regulations set forth in Part 4 of this Code
2.4.5 Helipads
2.4.5.1 General
Helipads on the roof top of a building or other locations shall be constructed in accordance with this Section.
2.4.5.2 Size
The minimum dimension of the landing area for helicopters weighing less than 1600 kg shall be 6 m x 6 m. There
shall be an average clearance of 4 m surrounding and at the level of the landing area which shall not be less than
2 m at any point.
2.4.5.3 Construction
Helicopter landing areas and supports shall be constructed with non-combustible material.
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2.4.5.4 Aviation approvalBNBC 2015 FINAL DRAFT
Before helipads start operating formal approval shall be obtained from the civil aviation authority.
2.4.6 Universal Accessibility
2.4.6.1 All Building (except Occupancies G, H, M and J) shall have universal accessibility as per provisions of this
Code.
2.4.6.2 Buildings have universal accessibility shall have accessible egress system.
2.5 REQUIREMENTS FOR OCCUPANCY A - RESIDENTIAL BUILDINGS
Buildings shall be classified as Occupancy A in accordance with Sec 2.1.5.
2.5.1 Construction, Height and Allowable Area
2.5.1.1 Buildings or parts thereof classified as Occupancy A shall be limited to the type of construction set forth
in Table 3.2.4 and shall not exceed in area or height as specified in Sections 1.8 and 2.4.2 of this Part.
2.5.1.2 Walls and floors separating dwelling units in the same building shall not be less than Type I-D
construction.
2.5.1.3 Storage or laundry rooms in Occupancy A2, A3, A4 or A5 that are used in common by the occupants
shall be at least Type I-D construction.
2.5.1.4 When a basement or a ground floor of a building of Occupancy A3 or A5 is used for parking or storage
of private cars of the occupants, the parking floor shall be of at least Type I-B construction.
2.5.1.5 When the basement or ground floor of a building of Occupancy A is used wholly or partly for generator
or electrical substation, the walls and floors surrounding such use shall be of at least Type I-B construction.
2.5.2 Location on Property
Buildings of Occupancy A shall comply with the requirements for location on property and fire resistive exterior
walls and openings as specified in this Code.
2.5.3 Access and Exit Facilities and Egress System
2.5.3.1 Facilities for access and exit and egress or escape shall comply with the provisions set forth in this Code.
2.5.3.2 Every sleeping room in ground, first and second floors shall have at least one operable window or door
for emergency escape which shall open directly into the exterior or an interior courtyard. The units shall be
operable from the inside without the use of any tool to provide a minimum clear opening of 500 mm width by
600 mm height with a maximum sill height of 1 m above the floor.
2.5.4 Lighting and Ventilation
All buildings or part of a building classified as Occupancy A shall conform to the provisions of Part 3, and Chapters
1 and 3 of Part 8.
2.5.5 Sanitation
Sanitation facilities provided in all Occupancy A buildings shall conform to this Part and Chapter 7 Part 8.
2.5.6 Minimum Dimension of Habitable and Non-habitable Rooms
The minimum dimensions of habitable and non-habitable rooms are specified in Sec 1.12.2 Chapter 1 Part 3.
2.5.7 Fire detection, Alarm, Evacuation and Extinguishment
All buildings shall conform to regulations set forth in Part 4 of this Code.
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2.5.8 Shaft and Exit Enclosure
Elevator shafts, vent shafts and other vertical openings shall be enclosed with a construction as specified in Part
4. Exit requirements shall comply with Part 4 of this Code.
2.6 REQUIREMENTS FOR OCCUPANCY B - EDUCATIONAL BUILDINGS
Buildings shall be classified as Occupancy B in accordance with Sec 2.1.6.
2.6.1 Construction, Height and Allowable Area
Buildings or parts of buildings classified as Occupancy B shall be limited to type of construction set forth in Table
3.2.4 and comply with the provisions of Sections 1.8 and 2.4.2 of this Part to meet the requirements of height and
area limitations.
2.6.1.1 Rooms or groups of rooms sharing a common space where flammable liquids, combustible dust or
hazardous materials are used, stored, developed or handled in an amount exceeding that specified in Sec 2.14.3
shall be classified as Occupancy J. Such rooms or groups of rooms shall comply with the requirements of fire
protection as specified in Part 4, Chapters 4 and 5.
2.6.1.2 Rooms or groups of rooms, sharing a common space or having separate spaces, served by a common
corridor or passage with less than 20 percent outdoor opening of wall in a building of height 11 m or less, or three
storey’s or less, need not be provided with smoke detectors and standpipe or sprinkler system for fire protection
provided it conforms with the access and exit requirements specified in Part 3, Chapter 1, Sec 1.6 and Part 4,
Chapters 4 and 5.
2.6.1.3 Buildings of Occupancy B situated outside the jurisdiction of any municipality shall have a construction
of at least two hours fire resistance.
2.6.2 Location on Property
Buildings of Occupancy B shall comply with the requirements for location on property and fire resistive exterior
walls and openings as specified in Sec 2.4.1.
2.6.3 Access and Exit Facilities and Egress System
Facilities for access and exit and Egress system shall comply with the provisions set forth in Sec 1.6, Chapter 1 Part
3 and Chapter 3 Part 4.
2.6.4 Lighting, Ventilation and Sanitation
Lighting, ventilation and sanitation facilities provided in Occupancy Group B buildings shall conform to Sec 1.16,
Chapter 1 Part 3 and Chapters 1 and 3 Part 8.
2.6.5 Minimum Dimensions of Class Rooms, Common Toilets and Staircases
The dimension of a class room shall be not less than 4 m on any side and shall have an area of not less than 0.75m²
per student. Other provisions for minimum dimensions shall comply with the requirements set forth in Sec 1.8 of
Chapter 1 Part 3.
2.6.6 Shaft and Exit Enclosure
Elevator shafts, vent shafts and other vertical openings shall be enclosed with a construction of at least 3 hour
fire resistance. Exit requirements shall comply with Chapter 3 Part 4.
2.6.7 Fire Detection, Alarm, Evacuation and Extinguishment System
All buildings shall conform to regulations set forth in Part 4 of this Code.
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2.7 REQUIREMENTS FOR OCCUPANCY C - INSTITUTIONAL BUILDINGS
Buildings shall be classified as Occupancy C in accordance with Sec 2.1.7.
2.7.1 Construction, Height and Allowable Area
The buildings or parts thereof classified as Occupancy C shall be limited to the type of construction set forth in
Table 3.2.4 and shall comply with the provisions of Sec 1.8 Chapter 1 Part 3 and Sec 2.4.2 to meet the requirements
of height and area limitations.
2.7.2 Location on Property
Buildings of Occupancy C shall comply with the requirements for location on property and fire resistive exterior
walls and openings as specified in Sec 2.4.1.
2.7.3 Access and Exit Facilities and Egress System
Facilities for access and exit and egress system shall comply with the provisions set forth in Sec 1.6, Chapter 1 Part
3 and Chapter 3 Part 4.
2.7.4 Lighting, Ventilation and Sanitation
All buildings or part of a building classified as Occupancy C shall conform to the provisions of Sec 1.16, Chapter 1
Part 3 and Chapters 1 and 3, Part 8.
2.7.5 Shaft and Enclosure
Elevator shafts, vent shafts and other vertical openings shall be enclosed with a construction of at least 4 hour
fire resistance. Exit requirements shall comply with Chapter 3, Part 4.
2.7.6 Fire Detection, Alarm, Evacuation and Extinguishment System
All buildings shall conform to regulations set forth in Part 4 of this Code.
BNBC 2015 FINAL DRAFT
2.8 REQUIREMENTS FOR OCCUPANCY D–HEALTH CARE FACILITIES
Buildings shall be classified as Occupancy D in accordance with Sec 2.1.8.
2.8.1 Construction, Height and Allowable Area
The buildings or parts thereof classified as Occupancy D shall be limited to the type of construction set forth in
Table 3.2.4 and shall comply with the provisions of Sec 1.8 Chapter 1 Part 3 and Sec 2.4.2 to meet the requirements
of height and area limitations.
2.8.2 Location on Property
Buildings of Occupancy D shall comply with the requirements for location on property and fire resistive exterior
walls and openings as specified in Sec 2.4.1.
2.8.3 Access and Exit Facilities and Egress System
Facilities for access and exit and egress system shall comply with the provisions set forth in Sec 1.6 Chapter 1, Part
3 and Chapter 3 of Part 4.
2.8.4 Lighting, Ventilation and Sanitation
All buildings or part of a building classified as Occupancy D shall conform to the provisions of Sec 1.16 Chapter 1
Part 3, Chapters 1 and 3 of Part 8.
2.8.5 Shaft and Enclosure
Elevator shafts, vent shafts and other vertical openings shall be enclosed with a construction of at least three hour
fire resistance. Exit requirements shall comply with Chapter 3 of Part 4.
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2.8.6 Fire Detection, Alarm, Evacuation and Extinguishment System
All buildings shall conform to regulations set forth in Part 4 of this Code.
2.9 REQUIREMENTS FOR OCCUPANCY E–BUSINESS
Buildings shall be classified as Occupancy E in accordance with Sec 2.1.9.
2.9.1 Construction, Height and Allowable Area
The buildings or parts thereof classified as Occupancy E shall be limited to the type of construction set forth in
Table 3.2.4 and shall comply with the provisions of Sec 1.8 Chapter 1 Part 3 and Sec 2.4.2 to meet the requirements
of height and area limitations.
2.9.2 Location on Property
Buildings of Occupancy E shall comply with the requirements for location on property and fire resistive exterior
walls and openings as specified in Sec 2.4.1.
2.9.3 Access and Exit Facilities and Egress System
Facilities for access and exit and egress system shall comply with the provisions set forth in Sec 1.6 Chapter 1 Part
3, Chapter 3 of Part 4.
2.9.4 Lighting, Ventilation and Sanitation
All buildings or part of a building classified as Occupancy E shall conform to the provisions of Sec 1.16 Chapter 1
Part 3, Chapters 1 and 3 of Part 8.
2.9.5 Shaft and Enclosure
Elevator shafts, vent shafts and other vertical openings shall be enclosed with a construction of at least 3 hour
fire resistance. Exit requirements shall comply with Chapter 3 of Part 4.
2.9.6 Fire Detection, Alarm, Evacuation and Extinguishment System
All buildings shall conform to regulations set forth in Part 4 of this Code.
2.10 REQUIREMENTS FOR OCCUPANCY F–MERCANTILE BUILDINGS
Buildings shall be classified as Occupancy F in accordance with Sec 2.1.10.
2.10.1 Construction, Height and Allowable Area
The buildings or parts thereof classified as Occupancy F shall be limited to the type of construction set forth in
Table 3.2.4 and shall comply with the provisions of Sec 1.8, Chapter 1 of Part 3 and Sec 2.4.2 to meet the
requirements and limitations of height and area.
2.10.2 Location on Property
Buildings of Occupancy F shall comply with the requirements for location on property and fire resistive exterior
walls and openings as specified in Sec 2.4.1.
2.10.3 Access and Exit Facilities and Emergency Escapes
Facilities for access and exit and emergency escape shall comply with the provisions set forth in Sec 1.6 Chapter
1 Part 3 and Chapter 3 Part 4.
2.10.4 Lighting, Ventilation and Sanitation
All buildings or part of a building classified as Occupancy F shall conform to the provisions of Sec 1.16 Chapter 1
Part 3, Chapters 1 and 3, Part 8.
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2.10.5 Shaft and EnclosureBNBC 2015 FINAL DRAFT
Elevator shafts, vent shafts and other vertical openings shall be enclosed with a construction of at least 4 hour
fire resistance. Exit requirements shall comply with Chapter 3, Part 4.
2.10.6 Fire Detection, Alarm, Evacuation and Extinguishment System
All buildings shall conform to regulations set forth in Part 4 of this Code.
2.10.7 Special Hazards
Installations which are discharging exhaust, heating apparatus, boiler and central heating/air-conditioning plant
shall conform to the provisions of this Code as specified in this Code.
2.11 REQUIREMENTS FOR OCCUPANCY G–INDUSTRIAL BUILDINGS
Buildings shall be classified as Occupancy G in accordance with Sec 2.1.11. A non-exhaustive and indicative list of
low hazard and moderate hazard industrial uses are listed in A to Z list. Storage and use of hazardous materials
shall not exceed the exempt amount specified in Sec 2.14.3.
2.11.1 Construction, Height and Allowable Area
The buildings or parts thereof classified as Occupancy G shall be limited to the type of construction set forth in
Table 3.2.4 and shall comply with the provisions of Sec 1.8 of Chapter 1, Part 3 and Sec 2.4.2 to meet the
requirements and limitations of height and floor area.
The ceiling height of the production area, shall confirm to the minimum volume required per workers as specified
by the Bangladesh Labor Act, 2006 and other laws of the land. In any case the ceiling height and the head room
clearance of a production floor shall not be less than 3.3 meter and 2.286 meter respectively.
2.11.2 Location on Property
Buildings of Occupancy G shall comply with the requirements for location on property and fire resistive exterior
walls and openings as specified in Sec 2.4.1.
2.11.3 Access and Exit Facilities and Egress System
Facilities for access and exit and emergency escape shall comply with the provisions set forth in Sec 1.6 Chapter
1, Part 3 and Chapter 3, Part 4.
2.11.4 Lighting, Ventilation and Sanitation
All buildings or part of a building classified as Occupancy G shall conform to the provisions of Sec 1.16 Chapter 1,
Part 3 and Chapters 1 and 3, Part 8. Industrial buildings having roof opening for day lighting and natural ventilation
shall comply with the following requirements:
(a) The aggregate opening in roof and external windows shall not be less than 10 Percent of the floor area.
(b) For natural ventilation by means of exterior window openings, the operable window area shall not be
less than 5 Percent of the total floor area.
Exception:
Industrial buildings wherein artificial lighting and mechanically operated ventilation systems of approved quality
are installed need not be provided with natural ventilation or natural lighting.
2.11.5 Shaft and Enclosure
Elevator shafts, vent shafts and other vertical openings shall be enclosed with a construction of at least 4 hour
fire resistance. Exit requirements shall comply with Chapter 3, Part 4.
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2.11.6 Fire Detection, Alarm, Evacuation and Extinguishment System
All buildings shall conform to regulations set forth in Part 4 of this Code.
2.11.7 Special Hazards
Chimneys, vents and ventilation ducts shall be constructed with noncombustible materials. Every bailer, central
heating plants, electrical rooms, or hot water supply boiler shall be separated from the rest of the occupancy or
use by not less than two hour fire resistive construction.
2.12 REQUIREMENTS FOR OCCUPANCY H–STORAGE BUILDINGS
Buildings shall be classified as Occupancy H in accordance with Sec 2.1.12.
2.12.1 Construction, Height and Allowable Area
The buildings or parts thereof classified as Occupancy H shall be limited to the type of construction set forth in
Table 3.2.4 and shall comply with the provisions of Sec 1.8 of Chapter 1, Part 3 and Sec 2.4.2 to meet the
requirements of height and area limitations.
2.12.2 Location on Property
The location on property for Occupancy H shall conform to Sec 2.4.1.
2.12.3 Access and Exit Facilities and Egress System
Facilities for access and exit and egress system shall comply with the provisions set forth in Sec 1.6 of Chapter 1,
Part 3 and Chapter 3, Part 4.
2.12.4 Lighting, Ventilation and Sanitation
All buildings or part of a building classified as Occupancy H shall conform to the provisions of Sec 1.16 of Chapter
1 Part 3, Chapters 1 and 3, Part 8.
2.12.4.1 Special provision
The provisions of Sec 1.16, does not apply to non-habitable spaces of H1 and H2 occupancies unless otherwise
required by this Code. Ventilators of size not less than 0.25 m² shall be provided where suitable 0.30 m above the
floor level for floor level ventilators and 0.30 m below the roof level for roof level ventilators. There shall be one
floor level ventilator and one roof level ventilator for every 0.25 m² of the floor area. Mechanized ventilation
system of approved quality shall be installed where required.
2.12.4.2 Though inhabitable, the minimum air quality of such indoor spaces shall be maintained in a way that it
does not pose any health hazard to the occasional users of that space.
2.12.5 Shaft and Enclosure
Elevator shafts, vent shafts and other vertical openings shall be enclosed with a construction of at least 4 hour
fire resistance. Exit requirements shall comply with Chapter 3, Part 4.
2.12.6 Fire Detection, Alarm, Evacuation and Extinguishment System
All buildings shall conform to regulations set forth in Part 4 of this Code.
2.12.7 Special Hazards
The storage of hazardous materials shall not exceed the exempt amount as specified in Table 3.2.5. The storage
of moderate and low hazardous materials shall be separated at least by a two hour fire resistive construction.
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Classification of Buildings Based on Occupancy Chapter 2
2.13 REQUIREMENTS FOR OCCUPANCY I–ASSEMBLY BUILDINGSBNBC 2015 FINAL DRAFT
Buildings shall be classified as Occupancy I in accordance with Sec 2.1.13.
2.13.1 Construction, Height and Allowable Area
The buildings or parts thereof classified as Occupancy I shall be limited to the type of construction set forth in
Table 3.2.4 and shall comply with the provisions of Sec 1.8 Chapter 1 Part 3 and Sec 2.4.2 to meet the requirements
and limitations of height and area.
2.13.2 Location on Property
Buildings of Occupancy I shall comply with the requirements for location on property and fire resistive exterior
walls and openings as specified in Sec 2.4.1.
2.13.3 Access and Exit Facilities and Egress System
Facilities for access and exit and Egress system shall comply with the provisions set forth in Sec 1.6 Chapter 1 of
Part 3 and Chapter 3 of Part 4 and universally accessibility as per provisions of this Code.
2.13.4 Lighting, Ventilation and Sanitation
All buildings or part of a building classified as Occupancy I shall conform to the provisions of Sec 1.16 Chapter 1
Part 3, Part 3 and Chapters 1 and 3, Part 8.
2.13.5 Shaft and Enclosure
Elevator shafts, vent shafts and other vertical openings shall be enclosed with a construction of at least 4 hour
fire resistance. Exit requirements shall comply with Chapter 3, Part 4.
2.13.6 Fire Detection, Alarm, Evacuation and Extinguishment System
All buildings shall conform to regulations set forth in Part 4 of this Code.
The specification of this Section shall apply to all parts of buildings and structures that contain stages or platforms
and other similar appurtenances as herein defined.
(a) Stages: A stage is a three side enclosed or partially enclosed portion of a building which is designed or
used for presentation of plays or lectures or other entertainment. A stage shall be further classified as
legitimate stage, regular stage and thrust stage.
(b) Stage, Legitimate: A stage wherein curtains, drops, leg drops, scenery, lighting devices or other stage
effects are adjustable horizontally or vertically or suspended overhead.
(c) Stage, Regular: A stage wherein curtains, fixed drops, valances, scenery and other stage effects are
suspended and are not adjustable or retractable.
(d) Stage, Thrust: A stage or platform extended beyond the proscenium line and into the audience.
2.13.6.1 Legitimate Stage
Legitimate stage shall be constructed as specified in Part 4, specifying the type of construction but shall not be
less than construction Type I-C. The position of the legitimate stage extending beyond the proscenium opening
line shall be permitted to be constructed with two hour fire-resistive materials. The floor of the stage may be
constructed with one hour fire rating materials. Thickness of a wooden floor shall not be less than 50 mm.
2.13.6.2 Regular and Thrust Stages
Regular stages and thrust stages shall be constructed by not less than two hour fire resistive materials. Wooden
floor when required in a stage shall not be less than 50 mm in thickness with one hour fire resistive rating.
Bangladesh National Building Code 2015 3-45
BNBC 2015 FINAL DRAFTPart 3
General Building Requirements, Control and Regulation
2.13.6.3 Trap doors
All trap doors and any other opening in stage floors shall be equipped with tight fitting solid wood trap doors with
thickness not less than 50 mm.
2.13.6.4 Stage rigging loft
The grid iron frame in the loft, housing lighting and audio equipment, all the machinery for flying scenery and fly
galleries, along with their installations, shall be constructed of approved noncombustible materials.
2.13.6.5 Foot lights and stage electrical equipment
Foot lights and border lights shall be installed in a protective cover constructed of noncombustible materials.
2.13.6.6 Trim, finish and decorative hangings
All materials used in moulding and decoration around the proscenium shall be of approved noncombustible
materials.
2.13.6.7 Proscenium curtain
The proscenium curtain shall be of approved fire retardant material and shall protect against passage of flame
and smoke for at least 30 minutes.
2.13.7 Motion Picture Projection Rooms
2.13.7.1 Every projection room shall be constructed in conformity with the construction requirements for the
type of the building in which the projection room is located. The wall opening required for projection need not
have a fire protection assembly but shall be closed with glass or other approved materials.
2.13.7.2 The floor area of a projection room shall not be less than 8 m² for a single machine. The working space
between the machines when more than one machine is used shall not be less than 0.75 m.
2.13.7.3 The height of the projection room shall have a minimum clear space of 2.5 m.
2.13.8 Sports Facilities
2.13.8.1 Vomiters, aisles and exits of seating galleries
Tunnels, aisles and exits of galleries shall be constructed conforming to the following requirements.
(a) There shall be a minimum of two exits remotely located from each other immediately to the outside for
each balcony or tier. There shall be at least three exits when seating capacity exceeds 1000 persons and
four exits when it exceeds 4000 persons. For every additional 1000 persons the exit shall be designed to
accommodate provision (f) given below.
(b) There shall be at least 0.6 m2 of space per person in the gallery. Minimum width considered for a seat in
the gallery shall be 0.45 m.
(c) There shall be a maximum of 33 seats on each side of any aisle. Minimum width of the main aisles and
the secondary aisles shall be 1.0 m and 0.7 m respectively.
(d) Entrance and exits shall be protected by safety railings.
(e) Back to back space between two rows of seats shall not be less than 0.80 m.
(f) The evacuation time in the galleries shall not be more than 10 minutes.
(g) All tunnels, aisles and exits shall conform to safety guidelines for means of escape set forth in Part 4.
(h) One percent of the total seat capacity shall have provisions for accommodation with universal
accessibility at the approach or exit level.
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Classification of Buildings Based on Occupancy Chapter 2
2.13.8.2 Swimming poolsBNBC 2015 FINAL DRAFT
Any swimming pool used or constructed for exclusive use by Occupancy A1 and is available only to the occupants
and private guests shall be classified as a private swimming pool. Any swimming pool other than private swimming
pool shall be classified as a public swimming pool. Swimming pools shall be constructed in conformity with the
following requirements.
(a) There shall be at least 1.5 m space between any sides of a swimming pool and a rear or side property line.
For street property lines, this distance shall be at least 2.0 m.
(b) Swimming pools shall be provided with overflow provision to remove scum and other materials from the
surface of the water. When water skimmers are used for private pools there shall be one skimming device
for each 50 m2 of surface area or fraction thereof.
(c) The overflow gutters shall not be less than 75 mm deep and shall be pitched to slope of one unit vertical
to 50 units horizontal (1:50) toward drains.
(d) Public swimming pools shall be so designed that the pool water turnover is at least once every 8 hours.
(e) Private swimming pools shall be designed so that there is a pool water turnover at least once every 18
hours.
(f) Public swimming pools shall be equipped with filters, the capacity of which shall be controlled to filter
140 liters per minute per m2 of surface area. Private swimming pool filters shall not filter more than 230
liters per minute per m2 of the surface area.
(g) The pH value of the pool water shall be between 7.0 and 7.5.
(h) All recirculation systems shall be equipped with an approved hair and lint strainer installed in the system
ahead of the pump.
(i) All swimming pool and equipment shall be designed to be emptied completely of water and the
discharged water shall be disposed in an approved manner and shall not create problems in the
neighboring property.
(j) Pumps, filters and other mechanical and electrical equipment shall be placed in enclosed spaces and shall
not be accessible to the bathers.
(k) Used water from the pool when being discarded shall be reused as grey water for the building and its
premises as per provision of Appendix G.
2.13.9 Amusement Building Fire Protection System
The fire protection system shall be as per provisions of this Code.
2.14 REQUIREMENTS FOR OCCUPANCY J–HAZARDOUS BUILDINGS
Buildings shall be classified as Occupancy J in accordance with Sec 2.1.14.
2.14.1 General
The plans for buildings and structures accommodating Occupancy J shall clearly indicate the type and intended
use of materials and its processing or handling methods so as to reflect the nature of use of each portion of such
buildings.
2.14.1.1 Occupancy J1
Any building or portion thereof containing any of the following items more than exempted quantity shall be
classified as Occupancy J1.
Bangladesh National Building Code 2015 3-47
BNBC 2015 FINAL DRAFTPart 3
General Building Requirements, Control and Regulation
(a) Combustible dusts and any similar solid material sufficiently comminuted for suspension in still air which,
when so suspended, is capable of self-sustained combustion.
(b) Combustible liquids - Any liquid having a flash point at or above 40°C shall be known as class II and class
III liquids. Combustible liquids shall be classified as follows:
(i) Liquids having flash point at or above 40°C and below 60°C.
(ii) Liquids having flash points at or above 60°C and below 95°C.
(c) Cryogenic liquids (flammable or oxidizing): Any liquid that has a boiling point below -130°C.
(d) Flammable Gases: Any gas when mixed with air in a proportion of 13% (by volume) forms a flammable
mixture under atmospheric temperature and pressure.
(e) Flammable Liquids: Any liquid that has a flash point below 40°C and has a net vapour pressure exceeding
275 kPa at 40°C. Flammable liquids shall be known as Class I liquid and shall be further classified as
follows:
(i) Liquids having flash point below 25°C and having a boiling point below 40°C.
(ii) Liquids having flash point below 25°C and having a boiling point at or above 40°C.
(iii) Liquids having flash points at or above 25°C and below 40°C.
(f) Oxidizers class 3: As determined in accordance with NFPA 43A.
(g) Oxidizing gases: As determined in accordance with NFPA 43C.
(h) Pyrophoric liquids, solids and gases that will ignite spontaneously in air at a temperature of 55°C or below.
(i) Unstable (reactive) materials class 3, non-detonable as determined in accordance with NFPA 704.
(j) Combustible fibers: Includes readily ignitable fibers like cotton, sisal, jute hemp, tow, cocoa fiber, oakum,
baled waste, baled waste paper, kapok, hay, straw, excelsior, Spanish moss and other similar materials.
(k) Flammable solid: Any solid including blasting agent or explosive that is liable to cause fire through
absorption of moisture, spontaneous chemical change or retained heat from manufacturing or
processing, or which when ignited burns so vigorously and persistently as to create a serious hazard.
(l) Organic peroxides, Class II and Class III as determined in accordance with NFPA 43B.
(m) Oxidizers Class I and Class II as determined in accordance with NFPA 43A.
(n) The bulk storage of unstable (reactive) materials Class 1 and Class 2 as determined in accordance with
NFPA 704, water reactive materials, Class 2 and Class 3 which react with water to release a gas that is
either flammable or present a health hazard as determined in accordance with NFPA 704.
2.14.1.2 Occupancy J2
Any building or portion thereof containing the following shall be classified as Occupancy J2:
(a) Corrosives: Any substance that causes visible destruction of or irreversible alteration in living tissues by
chemical action at the site of contact.
(b) Highly toxic materials: The materials falling in this category are as follows:
(i) Oral Toxicity: A chemical that has a median lethal dose of 50 mg or less per kg of body weight when
administered orally to albino rats weighing between 200 and 300 gm each.
(ii) Toxicity of Inhalation: A chemical that has a median lethal concentration in air of 200 ppm or less by
volume of gas or vapors, or 2 mg per liter or less of mist, fume or dust, when administered by
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Classification of Buildings Based on Occupancy Chapter 2
continuous inhalation for 1 hour (or less if death occurs within 1 hour) to albino rats weighingBNBC 2015 FINAL DRAFT
between 200 and 300 grams each.
(iii) Toxicity by Skin Absorption : A chemical that has median lethal dose of 200 mg or less per kg of body
weight when administered by continuous contact for 24 hours (or less if death occurs within 24
hours) with the bare skin of albino rabbits weighing between 2 and 3 kg each.
(iv) Irritants: Any noncorrosive chemical or substance which causes a reversible inflammatory effect on
living tissues by chemical action at the site of contact.
(v) Radioactive Material: Any material or combination of materials that spontaneously emit ionizing
radiation.
(vi) Sensitizers: A chemical or substance that causes a substantial proportion of exposed people or
animals to develop an allergic reaction in normal tissue after repeated exposure.
(c) The Occupancy J2 shall also include among others the followings:
(i) Dry cleaning establishments using flammable solvents.
(ii) Explosive manufacturing.
(iii) Paint or solvent manufacturing (flammable base).
(iv) Pyrexin plastic manufacturing.
(v) Sodium nitrate or ammonium nitrate
(vi) Storage of combustible film.
2.14.1.3 Occupancy J3
Any building or portion thereof which is used for storage, handling, processing or manufacture of materials and
products that use biological processes and in which the risk of harmful biological threat to the occupants exist,
shall comply with the guidelines specified by the Department of Health.
2.14.1.4 Occupancy J4
Any building or portion thereof which is used for storage, handling, processing or manufacture of materials and
products that use nuclear and radioactive processes and in which the risk of radioactive contamination exists,
shall comply with the guidelines specified by Bangladesh Atomic Energy Commission.
2.14.2 Special Provisions
2.14.2.1 The following shall not be included in Occupancy J but shall be classified in the occupancy group which
they most nearly resemble and such classification shall be approved by the Authority:
(a) All buildings and structures and parts thereof which contain less than the exempt quantities as specified
in Table 3.2.5, when such buildings comply with the fire protection provisions of this Code.
(b) Rooms containing flammable liquid in lightly closed containers of 4 litre capacity or less for retail sales or
private use on the premises and in quantities not exceeding 820 litres/m² of room area.
(c) Retail paint sales rooms with quantities not exceeding 820 litres/m² of room area.
(d) Closed systems housing flammable or combustible liquids or gases used for the operation of machinery
or equipment.
(e) Cleaning establishments.
(f) Liquor stores and distributors without bulk storage.
(g) Tire storage containing less than 10,000 vehicle tires.
(h) The storage or use of materials for agricultural purposes for use on the premises.
Bangladesh National Building Code 2015 3-49
Part 3
General Building Requirements, Control and Regulation
(i) Pyrophoric solids or liquids not exceeding 3 m3 in storage cabinet located in a building that is equipped
throughout with an automatic sprinkler system provided in accordance with the fire protection provisions
of this Code.
(j) Pyrophoric solids or liquids not exceeding 3 kg in storage cabinet located in a building that is provided
with an automatic sprinkler system installed in accordance with the fire protection provisions in
accordance to Part 4 of this Code.
(k) Class 2 water reactive materials not exceeding 100 kg in an approved storage cabinet located in a building
that is provided with automatic sprinkler installed in accordance with the fire protection provisions in
accordance to Part 4 of this Code.
2.14.3 Construction, Height and Allowable Area
2.14.3.1 The buildings or parts thereof classified as Occupancy J shall be limited to the type of construction set
forth in Table 3.2.4 and shall comply with the provisions of Sec 1.8 of Chapter 1, Part 3 and Sec 2.4.2 of this Chapter
to meet the requirements of height and area limitations.
2.14.3.2 Floors: The floors and spaces containing hazardous materials and in areas where motor vehicles, boats,
helicopters or airplanes are stored, repaired or operated shall be of noncombustible, liquid-tight construction.
Exception: In floors and areas where no repair works are carried out may be surfaced or waterproofed with
asphaltic paving materials.
2.14.3.3 Spill Control: The floors containing hazardous repair or other works shall be recessed a minimum of 100
mm so as to prevent flow of liquids to adjoining areas.
2.14.3.4 Drainage: The buildings and areas shall be provided with approved drainage system to direct the flow
of liquids to an approved location or room or area designed to provide secondary containment of the hazardous
materials and fire protection water.
BNBC 2015 FINAL DRAFT
Table 3.2.5(a): Exempted Amount of Hazardous Materials in Terms Physical Hazard in a Control Area
Sl. Maximum Quantities in
No.
Material Class/State Storage Limit Use Closed Use Open
Systems Systems
38 liters
Class I-A 115 liters * 115 liters * 115 liters
1 Flammable liquids 454 liters * 454 liters * 114 liters
320 liters
Class I-B and Class I-C 12490 liters
Class-II 454 liters* 454 liters* 113 liters*
2 Combustible liquids Class-III-A 1249 liters* 1249 liters* Not
applicable
Class-III-B 49962 liters* 49962 liters*
Not
3 Combination of Class I-A, Class I-B, 454 liters* 454 liters* applicable
flammable liquids Class I-C 38 liters
28 m3 at NTP (Natural 28 m3 at NTP 113 liters
Gaseous Temperature and (Natural
Pressure) 0.57 m3
4 Flammable gases Temperature and 5.7 m3
Pressure)
Liquefied 113 liters 113 liters
Class I-A 113 liters 113 liters
5 Liquefied flammable 454 liters 454 liters
2.832 m3 2.832 m3
Class I-B and Class I-C 28.32 m3 28.32 m3
6 Combustible fibres Loose
Baled
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Classification of Buildings Based on Occupancy Chapter 2
Sl. Maximum Quantities in
No.
Material Class/State Storage Limit Use Closed Use Open
Systems Systems
Pigs, ingots, heavy
castings 454 kg 454 kg 454 kg
7 Flammable solids Light castings, light 57 kg 57 kg 57 kg
metallic products
8 Unstable (reactive) Scraps, shavings, 0.454 kg 0.454 kg 0.454 kg
detonable powders, dusts
0.454kg or 0.28m3 0.113 kg or 0.454kg or
9 Unstable (reactive) Class 4 (NTP) 0.057m3 (NTP) 0.28m3 (NTP)
detonable
Class 3 0.454kg or 0.28m3 0.113 kg or 0.454kg or
(NTP) 0.057m3 (NTP) 0.28m3 (NTP)
Class 4
0.454kg or 0.28m3 0.113 kg or 0.454kg or
Class 3 (NTP) 0.057m3 (NTP) 0.28m3 (NTP)
Class 2 2.27 kg or 1.42m3 (NTP) 0.454kg or 0.454kg
0.2832m3 (NTP)
Class 1 22.7kg or 70.8 m3 (NTP) 22.7kg or 70.8m3 4.54 kg
3
2 Not limited or 21.24m3 (NTP) Not limited
(NTP)
Not limited 11.25 kg
0.454 kg 11.25 kg
11.25 kg
0.454 kg
10 Water-reactive detonableBNBC 2015 FINAL DRAFT 11.25 kg
11 Water-reactive non- 3 2.27 kg 2.27 kg 0.454 kg
detonable 2 22.7 kg 22.7 kg 4.54 kg
1 Not Limited Not Limited Not Limited
Class 4 0.454 kg, 0.1135kg 0.1135kg
12 Oxidizing Materials Class 3 4.54 kg 0.227kg 0.227kg
Class 2 113 kg 113 kg 113 kg
13 Oxidizing Gas Class 1 1816 kg 1816 kg 1816 kg
Gaseous 42.48 m3 (NTP) 42.48 m3 (NTP) Not
14 Pyrophoric Material Liquefied
detonable Not applicable 56.78 liters 56.78 liters applicable
Not applicable 0.454 kg or 0.056 m3 0.056 m3 (NTP) Not
15 Pyrophoric Material non- Division 1.1 0.28m3 (NTP)
detonable (NTP) applicable
1.8 kg. or 1.4 m3(NTP) 0.1135 kg
0
0.454 kg
0
0.1135 kg
Division 1.2 0.454 kg 0.1135 kg 0.1135 kg
Division 1.3 2.27 kg 0.454 kg 0.454 kg
16 Explosives** Division 1.4 22.7 kg 22.7 kg Not
Division 1.4G 56.75 kg Not applicable applicable
Not
applicable
Division 1.5 0.454 kg 0.1135 kg 0.1135 kg
Division 1.6 0.454 kg Not applicable Not
applicable
* The maximum quantities may be increased by 100 Percent in areas not accessible to the public in buildings provided with
automatic sprinkler system.
** see: Explosive control act.
Bangladesh National Building Code 2015 3-51
Part 3
General Building Requirements, Control and Regulation
Table 3.2.5(b): Exempted Amounts of Hazardous Materials in Terms Health Hazard in a Control Area
Material Class/State Maximum Quantities in
Corrosive
Highly toxic Not Single Storage Closed Systems Open Systems
applicable 454kg or 379 liters
Toxic 2270 kg or 1892 liters or 227kg or 1892 liters
Not 1.362 kg
applicable 23 m3 NTP or 23 m3 NTP
56.75 kg
Not 4.54 kg or 0.57 m3 NTP 4.54 kg or 0.57 m3
applicable
NTP
227 kg or 23 m3 NTP 227 kg
Table 3.2.5(c): Location and Number of Control Areas
Grade Number of Control Fire Resistance Rating of Barriers in Hours
Level Areas per Floor2
Floor Level1 Walls Floors Floor Supporting
Members
Higher than 9 5 12 2
7-9 5
6 12.5 22 2
5 12.5
4 12.5 22 2
3 50
2 75 22 2
Above BNBC 2015 FINAL DRAFT 22 2
21 2
31 2
1 100 4 1 2
Below 1 75 3 1 2
2 50 2 1 2
Lower than 2 Not Allowed Not Allowed Not Allowed Not applicable
The maximum allowable quantity per control area shown in Table 3.2.5
2.14.3.5 The drains shall be designed with adequate slope and section to carry the design discharge of the
sprinkler system. The material used in the drains shall be suitable for drainage of the storage materials.
2.14.3.6 Separate drainage system shall be designed for materials which react with each other producing
undesirable results. They may be combined when they have been provided with approved means of discharge
into the public sewer or natural stream or river.
2.14.3.7 Containment: The outflow from the drains shall be directed to a containment system or other area that
provide a secondary storage for the hazardous materials and liquids and fire protection water. The containment
capacity shall be capable of containing the outflow from the drains for a period of at least one hour.
2.14.3.8 The overflow from secondary containment system shall be directed to a safe location away from the
building, adjoining properties and storm drain.
2.14.3.9 If the secondary containment storage area is open to rainfall it shall be designed to accommodate 24
hour rainfall or a continuous rainfall of 100 mm per day.
2.14.3.10 Smoke and Heat Vents: Smoke and heat vents shall be provided in areas or rooms containing hazardous
materials exceeding the exempt amount of Table 3.2.5.
2.14.3.11 Standby Power: Standby power shall be provided in the occupancies where Class I, II or III organic
peroxides are stored.
2.14.4 Location on Property
The location on property for Occupancy J shall conform to Sec 2.4.1 and Part 4.
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2.14.5 Access and Exit Facilities and Emergency EscapesBNBC 2015 FINAL DRAFT
Facilities for access and exit and emergency escape shall comply with the provisions set forth in Sec 1.6 of Chapter
1 Part 3, and Chapter 3, Part 4.
2.14.6 Lighting and Ventilation
2.14.6.1 All spaces and rooms customarily occupied by human beings shall be provided with natural light by
means of exterior glazing with an area of not less than 10 Percent of the floor area. Such rooms and spaces shall
be provided with natural ventilation by means of exterior openings with an open able area not less than 5 Percent
of the total floor area or artificial light and mechanically operated ventilation system as per provisions of this
Code.
2.14.6.2 Ventilation in Hazardous Locations: The rooms, spaces or areas where explosive, corrosive,
combustible, flammable or highly toxic dust, mists, fumes, vapors or gases are stored or may be emitted due to
the processing, use, handling or storage of materials shall be mechanically ventilated.
2.14.6.3 The mechanical ventilation of all hazardous uses shall be segregated or separated from the ventilation
of other areas. The emissions generated at work areas shall be confined to the area in which they are generated
and shall be removed or discharged outside the building and preventive measures against back flow of such
hazardous fumes or gases inside the building shall be installed.
2.14.6.4 Ventilation of Toilets: Toilets shall be provided with fully open able exterior window of at least 0.3 m²
in area or a vertical duct not less than 62500 mm² in cross-section for the first water closet, with 31250 additional
mm² for each additional fixture or a mechanically operated exhaust system equipped to provide a complete
change of air in every 15 minutes. Such system shall be connected to the outside air and the point of discharge
shall be at least 1.0 m away from any other opening into the building.
2.14.6.5 Other requirements of water closets are specified in Sec 1.12.4 Chapter 1, Part 3.
2.14.7 Sanitation
All buildings or part of a building classified as Occupancy J shall conform to the provisions of Sec 1.16 of this
Chapter and Part 8 of this Code.
2.14.8 Shaft and Exit Enclosures
Elevator shafts, vent shafts and other vertical openings shall be enclosed with a construction of at least 4 hour
fire resistance. Exit requirements shall comply with Chapter 3, Part 4.
2.14.9 Fire Detection, Alarm, Evacuation and Extinguishment System
All buildings shall conform to regulations set forth in Part 4 of this Code.
2.14.10 Explosion Control
Explosion control, equivalent protective devices or suppression systems or barricades shall be installed to control
or vent the gases resulting from deflagrations of dusts, gases or mists in a room or area, building or other
enclosures to minimize structural or mechanical damage.
Walls, floors and roofs separating a use from explosion exposure shall be designed according to the provisions of
Chapter 1, Part 6.
Explosion venting shall be designed in exterior walls or roof only. The venting shall be provided to prevent serious
structural damage and production of lethal projectiles. The venting design shall recognize the natural
characteristics and behaviors of building materials in an explosion. The vents shall be designed to relieve at a
maximum internal pressure of 1.0 kPa but not less than the loads required by Chapter 2, Part 6. One or more of
the following systems shall be installed to relieve explosion, where applicable:
Bangladesh National Building Code 2015 3-53
BNBC 2015 FINAL DRAFTPart 3
General Building Requirements, Control and Regulation
(a) Lightweight materials in walls
(b) Light fastening devices with hatch covers
(c) Light fastening with outward opening swing doors in exterior walls
(d) Nonbearing walls with light ties
The venting devices shall discharge vertically or horizontally directly to an unoccupied yard having a width of not
less than 16 m on the same plot.
The releasing devices shall be so located that the discharge end shall not be less than 3 m vertically and 6 m
horizontally from window openings or exits in the same or adjoining buildings.
2.14.11 Special Hazard
Chimneys, vents and ventilation ducts shall be of noncombustible materials.
All boilers, central heating plants, electrical rooms or hot water supply boiler shall be separated from the rest of
the occupancies or uses by not less than 2 hour fire resistive construction.
The devices that generate a spark, flame or glow capable of igniting gasoline shall not be installed or used within
0.5 m of the floor.
Equipment or machinery that produces or emits combustible or explosive dust or fibers shall be provided with an
approved dust collecting and exhaust system.
The equipment or systems that are used to collect or process or convey combustible dust or fibers shall be
installed with explosion venting or containment system.
2.15 REQUIREMENTS FOR OCCUPANCY K–GARAGE BUILDINGS
Buildings shall be classified as Occupancy K in accordance with Sec 2.1.15.
Exception: Non-separated use mentioned in Sec 2.3.1.
2.15.1 Construction, Height and Allowable Area
The buildings or parts thereof classified as Occupancy K shall be limited to the type of construction set forth in
Table 3.2.4 and Sec 2.4.4.2 and shall comply with the other provisions of Sec 1.8 Chapter 1 Part 3, Appendix F and
Sec 2.4.2 to meet the requirements and limitations of height and area. With the exceptions mentioned in Sec
2.4.3, all garage floors shall be constructed with not less than 4 hour fire resistance materials.
2.15.1.1 Floors: The floors and spaces where motor vehicles are stored, repaired or operated shall be of
noncombustible, liquid-tight construction.
Exception: In floors and areas where no repair works are carried out may be surfaced or waterproofed with
asphaltic paving materials.
2.15.1.2 Spill Control: The floors containing hazardous repair or other works shall be recessed a minimum of 100
mm so as to prevent flow of liquids to adjoining areas.
2.15.1.3 Drainage: The buildings and areas shall be provided with approved drainage system to direct the flow
of liquids to an approved location or room or area designed to provide secondary containment of the hazardous
materials and fire protection water.
The drains shall be designed with adequate slope and section to carry the design discharge of the sprinkler system.
The material used in the drains shall be suitable for drainage of the storage materials.
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The quality of discharged liquids must attain approved level before discharging into the public sewer or naturalBNBC 2015 FINAL DRAFT
stream or river.
2.15.1.4 Smoke and Heat Vents: Smoke and heat vents shall be provided in areas or rooms containing hazardous
materials exceeding the exempt amount of Table 3.2.5.
2.15.2 Location on Property
Buildings of Occupancy K shall comply with the requirements for location on property and fire resistive exterior
walls and openings as specified in Sec 2.4.1.
2.15.3 Access and Exit Facilities and Emergency Escapes
Facilities for access and exit and emergency escape shall comply with the provisions set forth in Sec 1.6 Chapter
1 Part 3, Chapter 3 Part 4 and Appendix F.
2.15.4 Lighting, Ventilation and Sanitation
All buildings or part of a building classified as Occupancy K shall conform to the provisions of Sec 1.16 Chapter 1
Part 3, Chapters 1 and 3, Part 8.
2.15.5 Shaft and Enclosure
Elevator shafts, vent shafts and other vertical openings shall be enclosed with a construction of at least 4 hour
fire resistance. Exit requirements shall comply with Chapter 3 Part 4.
2.15.6 Fire Detection, Alarm, Evacuation and Extinguishment System
All buildings shall conform to regulations set forth in Part 4 of this Code.
2.16 REQUIREMENTS FOR OCCUPANCY L – UTILITY BUILDINGS
Buildings shall be classified as Occupancy L in accordance with Sec 2.1.16.
2.16.1 Construction, Height and Allowable Area
The buildings or parts thereof classified as Occupancy L shall be limited to the type of construction set forth in
Table 3.2.4 and Sec 2.4.3, and shall comply with the provisions of Sec 1.8 Chapter 1 Part 3, and Sec 2.4.2 to meet
the requirements and limitations of height and area.
2.16.2 Location on Property
Buildings of Occupancy L shall comply with the requirements for location on property and fire resistive exterior
walls and openings as specified in Sec 2.4.1.
2.16.3 Access and Exit Facilities and Egress System
Facilities for access and exit and egress system shall comply with the provisions set forth in Sec 1.6 Chapter 1 Part
3 and Chapter 3 Part 4.
2.16.4 Lighting, Ventilation and Sanitation
All buildings or part of a building classified as Occupancy L shall conform to the provisions of Sec 1.16 Chapter 1
Part 3, Chapters 1 and 3, Part 8.
2.16.5 Shaft and Enclosure
Elevator shafts, vent shafts and other vertical openings shall be enclosed with a construction of at least 4 hour
fire resistance. Exit requirements shall comply with Chapter 3 Part 4.
Bangladesh National Building Code 2015 3-55
BNBC 2015 FINAL DRAFTPart 3
General Building Requirements, Control and Regulation
2.16.6 Fire Detector, Alarm, Evacuation and Extinguishment System
All buildings shall conform to regulations set forth in Part 4 of this Code.
2.16.7 Special Hazard
2.16.7.1 Since the nature of use of this occupancy involves hazard, special consideration for maintenance and
operational safety must be ensured. Depending upon the degree of hazard involved, this occupancy type may
have separate and isolated structure.
2.16.7.2 Chimneys and vents and ventilation ducts shall be of noncombustible materials.
All boilers, central heating plants, electrical rooms or hot water supply boiler shall be separated from the rest of
the occupancies or uses by not less than 2 hour fire resistive construction.
The devices that generate a spark, flame or glow capable of igniting gasoline shall not be installed or used within
0.5 m of the floor.
Equipment or machinery that produces or emits combustible or explosive dust or fibers shall be provided with an
approved dust collecting and exhaust system.
The equipment or system that is used to collect or process or convey combustible dust or fibers shall be installed
with explosion venting or containment system.
2.17 REQUIREMENTS FOR OCCUPANCY M – MISCELLANEOUS BUILDINGS
Buildings shall be classified as Occupancy M in accordance with Sec 2.1.17.
2.17.1 General
The buildings or parts thereof classified as Occupancy M shall be limited to the type of construction set forth in
Table 3.2.4 and shall comply with the requirements of Sections 1.8 and 2.4.2 to meet the requirements of height
and area limitations.
Any building or portion thereof that exceeds the limitations provided in this Chapter shall be classified in the
occupancy group other than M that it most nearly resembles.
2.17.2 Location on Property
The location on property for Occupancy M shall conform to Sec 2.4.1.
2.17.3 Access and Exit Facilities and Emergency Escapes
Access and exit facilities for Occupancy M shall comply with the specification set in Sec 1.6 Chapter 3, Part 4.
2.17.4 Lighting, Ventilation and Sanitation
All buildings or part of a building classified as Occupancy M shall conform to the provisions of Sec 1.16 Chapters
1 and 3, Part 8.
2.17.5 Shaft and Exit Enclosures
Elevator shafts, vent shafts and other vertical openings shall be enclosed with a construction of at least 4 hour
fire resistance. Exit requirements shall comply with the requirements of Chapter 3, Part 4.
2.17.6 Fire Detection, Alarm, Evacuation and Extinguishment System
All buildings shall conform to regulations set forth in Part 4 of this Code.
3-56 Vol. 1
Classification of Buildings Based on Occupancy Chapter 2
Table 3.2.6: A-Z List of Occupancy Classification
Use or Occupancy Brief Description Occupancy Class/Sub-class
A G or J depending on nature of
materials involved
Adhesives manufacture Excluding manufacture of basic components…
G
Advertising displays manufacture… Including repairs… G
Agricultural machinery
manufacture, Without nuisance or sales limitation H
Agriculture Small farm house, (limited to storage quantity) F
Agricultural Large farm house, storage quantity unlimited… H or J
Small grain processing unit, (limited to quantity) G
Aircraft manufacture (including Large grain processing unit, quantity unlimited… G or J
parts)… G or J depending on nature of
Airports… materials and process involved
MIXED USE (depending on
Amusement parks, children's BNBC 2015 FINAL DRAFT(See children's amusement parks) detail requirement)
Amusement park activities… -
Animal Animal hospitals… I
Animal pound (for stray and lost animal)… F
Antique stores… Animal crematorium… H
Apartments Killing establishments, for retail sales … G
Slaughtering, processing and packing… F
Apartment hotels… G
Apparel (see residential) F
Appliances in walkup buildings…
In high rises… A
Arenas, auditoriums, or stadiums in housing complex… A
Art Galleries A
(See clothing) A5
Art goods manufacture, religious Electrical appliance Manufacturing…
temple or church, excluding foundry Television, radio, phonograph or household G
operations… appliance stores, (Limited as to floor areas)… F
Art metal craft shops… Television, radio, phonograph or household
Art needle work… appliance stores, (Unlimited)… F
Household appliance repair shops…
See Assembly (Limited as to capacity)… F
See Assembly (Unlimited)… I
Commercial (sales included) I
With exhibition open to public viewing for limited F
period (sales included) I
Six occupants or less… G
More than six occupants (see industrial) F
Non-separated use to A1 and
A2 Occupancy
G
Bangladesh National Building Code 2015 3-57
Part 3
General Building Requirements, Control and Regulation
Use or Occupancy BNBC 2015 FINAL DRAFT Brief Description Occupancy Class/Sub-class
Artist's supply stores… F
Asphalt or asphalt products Manufacture… J
Assembly Large assembly with fixed seats I1
Small assembly with fixed seats I2
Athletic equipment manufacture… Large assembly without fixed seats I3
Athletic goods stores… Small assembly without fixed seats I4
Auctions rooms, open to public… For sport facilities I5
Auditoriums G
Automatic laundries See assembly F
Automobiles I
Dead Storage… I
Automotive service stations Driving Schools… G
Awnings Glass or mirror shops… H
Washing… E
Bakeries Manufacture, including parts, or engine rebuilding… F
Rental establishments… K
Banks, Repairs, body… J
Banquet halls… Repairs, without body repairs… K
Bar, alcoholic Sales open or enclosed… K
Barber shops… Seat cover or convertible top establishments, selling K
Barns or installation… K
Showrooms, no repair services.... F
Supply stores, no repair services....
Tire sales establishments, limited to quantity… K
Tire sales establishments, unlimited… F
Wrecking establishments… F
Limited as to total area… J
Unlimited.... G
Custom shops K
Manufacture, with no limitation on production or on K
floor area … H
G
B
non-separated use to main
Home-made, six or less occupants (baking included) occupancy
Large scale, more than six occupants (baking G
included)
Sales only F
Including drive-in banks… E
I
I
F
H
3-58 Vol. 1
Classification of Buildings Based on Occupancy Chapter 2
Use or Occupancy BNBC 2015 FINAL DRAFT Brief Description Occupancy Class/Sub-class
Barracks (See residential) A4
Baths, steam… I
Beaches, commercial … Bottling works …
Beauty parlors… Manufacture, Alcoholic … Not applicable
Beverages Non-alcoholic … F
Manufacture … G
Bicycle Rental or repair shops … J
Sales… G
Billiard parlors G
Blacksmith shops small scale (limited to six occupants), repair or F
making F
Blueprinting establishments Unlimited… I
Boarding houses drawing printing F
Borstals (See residential)
Boatels G
Boats or ships Bailer works at port or dock G
Breaking A
Bone distillation… Building or repair, for boats less than 200 ft. in C
Botanical garden structures length… A
Book Building or repair, for boats 200 ft. or more in J
length… J
Bottling works, for all beverages… Docks, for small pleasure boats … J
Bowling alleys… Fuel sales, open or enclosed
Breweries… Un- restricted as to location… J
Brick manufacture… Restricted as to location…
Rentals opened or enclosed… Not applicable
Sales opened or enclosed…
Showrooms, with no repair services... F
Storage, repair, or painting, including the incidental J
sales of boats, boat parts, or accessories, with F
restrictions on boat size and setbacks... F
F
Binding (see printing) G
Hand binding or tooling…
Store.... G or J depending on process or
material used
Limited as to number of lanes...
Unlimited… M
G
F
G
I
I
G
J
Bangladesh National Building Code 2015 3-59
Part 3
General Building Requirements, Control and Regulation
Use or Occupancy BNBC 2015 FINAL DRAFT Brief Description Occupancy Class/Sub-class
Brush or broom manufacture... G
Building materials sales open or enclosed, limited as to lot area … F
Yards, for sales, storage, or handling, open or F
Bungalow enclosed, unlimited as to lot area except in the case
Business of lumber yards … A
(See residential) B1
Bus stations Offices B2
Research and testing laboratories B3
Bus stops Essential services K (bus area) and I (passenger
Business machines With less than 10 berths… area)
Business schools or colleges … With 10 or more berths… MIXED (as per detail
Buying house (garments) see Bus stations requirement including K and I)
Café Manufacture…
Small, repair shops… G
Cafeteria Stores, sales, or rentals... F
Camera and photo equipment F
Camps, overnight or outdoor day … storage restricted to sample B
Candy stores E
Canneries, including food products C
Canteen Non-separated use to main
Canvas or canvas products Six persons or less Occupancy
manufacture…
Cargo terminal More than six persons (see mercantile) F
With commercial kitchen MIXED (G and I)
Carnivals, temporary… Without commercial kitchen
Carpentry shops … Manufacture… I
Carpet G
With or without cooking facility MIXED (A, I and other
Carport depending on the nature of use)
containing low fire-risk materials F
containing moderate fire-risk materials J
containing high fire-risk materials I
G2
Cleaning establishments....
H
Manufacture… H
Carpet, rug, linoleum or other floor covering stores J
Unlimited … I5
Roofed wall less shelter for car G
J or G depending on the nature
Automated mechanical parking of materials involved
G
F
K or H depending on the
nature of use
K or H depending on the
nature of use
3-60 Vol. 1
Classification of Buildings Based on Occupancy Chapter 2
Use or Occupancy BNBC 2015 FINAL DRAFT Brief Description Occupancy Class/Sub-class
Catering establishments… Commercial kitchen G
Office E
Cattle shed, stables Storage, open or enclosed … H
Cement manufacture … Storage for temporary structure's fabrication J
Cemeteries… material
Ceramic products … H
Manufacture G2
Chamber, doctors' or dentists', H
(outpatient only) Display and sales G or J based on nature of
Charcoal manufacture... 50 or less occupants material used
Chemicals above 50 occupants F
E
Child care home Compounding or packaging... D
Child care institution G
Children's amusement parks Manufacture… G or J depending on nature of
materials involved
Churches, with fixed pews Small… G or J depending on nature of
Cigar stores… Medium size… materials involved
Cinema hall Large size.... C
Cineplex Unlimited as to size... C
Circuses, temporary... (See Assembly with fixed seats) I
Class room I
Clay manufacture … (See Assembly with fixed seats) I
Clay pits… (See Assembly with fixed seats) I
Cleaning or cleaning and dyeing (See Assembly) I
establishments School, college or university F
Clinics I
(See dry cleaning).... I
Coaching centre With inpatient I
Cold storage Only outpatient, limited to quantity (see chambers, B
Composite textile mill doctors' or dentists') G
Only outpatient, unlimited Not applicable
With diagnostic facilities (see diagnostic facilities)…
Government community clinic D
(See educational facilities)
D
E
B
H
G or J depending on nature of
material and process used
Bangladesh National Building Code 2015 3-61
Part 3
General Building Requirements, Control and Regulation
Use or Occupancy BNBC 2015 FINAL DRAFT Brief Description Occupancy Class/Sub-class
Cottage industries Small, fifty or less workers…(see industrial facilities) G1
Large, more than fifty workers… (see industrial
Clock facilities) G1 or G2 depending on the
Clothing nature of material and process
Manufacture… used
Clubs Non-commercial (members Stores or repair shops...
only) Accessory stores G
Custom manufacture or altering for retail… F
Clubs, for public use Manufacture... F
F
Clubs, Sporting Rental establishments… G or J depending on nature of
Coal Store, Limited as to floor area… the material involved
Store, Unlimited…
Coin stores... Including accommodation F
Condensed and powdered milk Night-club F
Coke products All types except those with outdoor swimming F
Colleges or universities pools… MIXED (A and I)
Colony, government or non- Excluding accommodation I
government Including accommodation
I
Products manufacture… MIXED (I and A or other
Sales, open or enclosed, Limited as to plot area… occupancies depending upon
Unlimited (see coal storage) nature of use)
Storage, open or enclosed … MIXED (I and A or other
occupancies depending upon
Manufacture... nature of use)
Manufacture...
See educational facilities J
J
J
J
F
J
J
B
MIXED (A and other occupancies
depending on use)
Commercial building (see business and/ or mercantile) K
Commercial parking garages or plots (See garages) MIXED (G and I)
Community centers… With commercial kitchen
Without commercial kitchen I
Concrete batching G
Concrete products manufacture Manufacture, including repairs.... G
Construction machinery G
Container terminal H or J (According to the hazard
classification regulation of the
port authority)
3-62 Vol. 1
Classification of Buildings Based on Occupancy Chapter 2
Use or Occupancy Brief Description Occupancy Class/Sub-class
Contractors' establishments Electrical, glazing, heating, painting, paper hanging, F
plumbing, roofing, or ventilating
Not applicable
Convalescent homes Contractors' yards...
Convents (See nursing homes) MIXED (A, B and I)
Cork products G
Cosmetics or toiletries Manufacture… J
Costume rental establishments… Manufacture... F
Cottage, tourist A5
Cotton ginning or cotton wadding or (See residential) J
liner manufacture…
Court houses… I
Crate manufacture G or J depending on the
material and process involved
Crematoriums Animals.
Cultural center Human. J
BNBC 2015 FINAL DRAFT MIXED (J and I)
D Mixed (depending on detail
requirement)
Dance halls Public
Dance School I
Dance studios (see studios) A
Day camps, outdoor
Day care Centre With six or less children I
Non-separated use to
Decorator's establishment More than six children Residential Occupancy
Office
Defense Buildings, for critical Storage, separated C
national defense capabilities E
Delicatessen stores (See food stores) H or J depending upon the
Dental Instruments manufacture… material involved
Laboratories (See laboratories, medical or dental) Not Applicable
Department stores… not exceeding 300 m²
more than 300 m² F
Diagnostic facilities, medical Outpatients only G
Diaper supply establishments...
Disinfectants manufacture… Attached to hospital F1
Dispensaries See drug store F2
Universities or colleges (above 12 grade) D
Dormitories Schools (12 grade or below) H
Manufacture… G
Drafting instruments L
Dressmaking shops, custom... F
A
C
G
F
Bangladesh National Building Code 2015 3-63
Part 3
General Building Requirements, Control and Regulation
Use or Occupancy Brief Description Occupancy Class/Sub-class
Drinking places, non-alcoholic
Drive-in theaters… (See cafe) I
Drug stores… F
Dry cleaning or clothes pressing Limited as to floor area, solvents and machine G or J depending on the
establishments capacity… process and quantity of
Dry cleaning or cleaning and dyeing material used
establishments Without restrictions… G or J depending on the
Dry Cleaning, using other than process and quantity of
flammable liquids in cleaning or material used
dyeing operations
Dry goods stores G
Dumps Limited as to floor area… F
Dyeing facilities/ industries Unlimited… F
Not applicable
Eating or drinking places J
BNBC 2015 FINAL DRAFT
Eco park structures E I
Educational facilities I
With restrictions on entertainment (see Assembly)
Electric Without restrictions on entertainment or dancing but I
limited to location in hotels (see Assembly) MIXED (depending upon the
Electrical Appliance Without restrictions (See assembly) nature of use)
Electronics manufacturing Up to higher secondary level B1
Electrolysis works Training and above-higher-secondary education B2
Electrotyping or stereotyping Pre-school facilities B3
Power or steam generating plants ... G
Embassy or High-commission or Substations, Public transit or railroad G
Consulate Substations, as part of public distribution system G
Engine Substations, low to medium voltage step down, at L
Engraving or photo-engraving consumers' end
Manufacture … G or J depending upon the
process or material to be used
Stores (including television, radio, phonograph or
household appliances) F
Contractors (See contractors' establishments) G
Equipment assembly, not including electrical
machinery…
Supplies, manufacturing..... G
J
Limited to quantity J
Unlimited (see printing) F
G
including rebuilding or reconditioning MIXED (depending on detail
Limited to quantity requirement)
J
F
3-64 Vol. 1
Classification of Buildings Based on Occupancy Chapter 2
Use or Occupancy Brief Description Occupancy Class/Sub-class
Excelsior manufacture Unlimited (see printing) G
Exhibition hall J
Exterminators See assembly I
See pest control F
Fabric stores
Factory F F
G or J (depending on process
Fairs, temporary Bulk processing, washing, curing, or dyeing and material involved)
Feathers Products manufacture, except washing , curing or
dyeing MIXED (I and F)
Felt Bulk processing, washing, curing, or dyeing J
Products manufacture, except washing, curing or J
Fertilizer manufacture dyeing
Field hospital, temporary G
With provision for ambulance access (to parks and G
play grounds)
BNBC 2015 FINAL DRAFT J
E
Filling stations (See refueling station) B
Manufacture G
Film, photographic E
(see residential) G
Fire Stations In walkup buildings… F
In high rises…
Fish products, packing or processing in housing complex A
A
Fishing tackle or equipment rental A
or sales MIXED (A and other
Flats occupancies)
F
Florist shops Products processing, except meat slaughtering or G
Food preparation of fish for packing
F
Stores, including supermarkets, grocery stores, meat
markets, or delicatessen stores
Foundries Ferrous or non-ferrous G or J (depending on process
(See colleges or universities) and material involved)
Fraternity houses See storage and hazardous buildings
Freight depot H and/or J
Frozen food lockers Limited up to exempted quantity J
Fuel briquettes manufacture Unlimited, See coal storage or petroleum storage G
Fuel sales, open or enclosed F
Goods manufacture, not including tanning or dyeing J
Funeral establishments I
Fungicides manufacture G
Fur G
Tanning, curing, finishing, or dyeing... J
Bangladesh National Building Code 2015 3-65
Part 3
General Building Requirements, Control and Regulation
Use or Occupancy Brief Description Occupancy Class/Sub-class
Furniture Custom shop, floor area of 100 m² or less F
Custom shop, floor area over 100 m² G
Manufacture… J or G depending upon nature
of materials involved
Store, Limited as to floor area…
Store, Unlimited … F
F
Furriers shops, custom G F
Freight depot H or J depending on the nature
Parking garage of material involved
Garages
Private garage K1
Garbage incineration or reduction K2
Garden shed Repair garage and show-rooms K3
Garden supply stores G
Gardens, truck BNBC 2015 FINAL DRAFT(See agriculture) M
Garments industries F
Gas, fuel Manufacture…
Distribution regulatory system (DRS) G
Gas manufacture for Medical purpose J
Hot-works (welding) G
Gasoline service stations (See refueling stations) J
Gelatin manufacture J
Generating plants, electric or steam Cutting shops…
Gift stores Manufacture… G
Glass Products manufacture from previously manufactured G
glass… F
Glazing contractor's establishment (See contractors' establishments) F
Glue manufacture G
Godown See storage buildings G
Golf Courses…
Courses, miniature..... F
Grain Driving ranges G
Milling or processing....
Graphite or graphite products Storage… Not applicable
Gravel pits Manufacture… I
Grocery stores I
Group homes Segregation of occupants on the basis of age group J
and disabilities (See institutional) J
G
Not applicable
F
C
Gypsum production industry J
3-66 Vol. 1
Classification of Buildings Based on Occupancy Chapter 2
Use or Occupancy Brief Description Occupancy Class/Sub-class
Gymnasiums Less than 300 occupants I
300 or more occupants I
Hair Commercial without spectator gallery (max 50
occupants) G
Hall, for incidental show (picture, G
drama, theatre…) H
Hardware G
Bulk processing, washing, curing, or dyeing I
Hazardous buildings Products manufacture (except washing, curing, or
dyeing) G
Health centers F
Products manufacture, custom G
(See assembly) F
J1
Manufacture… J2
Stores… J3
Bodies manufacture… J4
Repair shops… D
Explosion-hazard building E
Chemical-hazard building E or D (depending upon the
Biological-hazard building facilities)
Nuclear-hazard building D1
With inpatient D2
Without inpatient (not more than 50 occupants) I
Government operated health centers
BNBC 2015 FINAL DRAFT F
Healthcare facilities Normal medical facilities
Emergency medical facilities G
Health club G
Heating contractor's establishment (See contractors' establishments)
Heat, ventilation and air- Without repair facilities… Non-separated use of
conditioning equipment showrooms Occupancy A
Heliports See embassy G
Hemp products manufacture… of the old and infirm (see institution) D
High Commission of mentally disabled (see institution) D
Home for care Not more than 6 occupants D
D
Home office D
A
Hosiery manufacture As part of disaster preparedness program C
Hospital, except animal hospital Casualty unit A
Emergency unit
Hostels Non-profit or voluntary, and related facilities...
Hotels Proprietary and related facilities...
For adults
For children
Transient…
Bangladesh National Building Code 2015 3-67
Part 3
General Building Requirements, Control and Regulation
Use or Occupancy Brief Description Occupancy Class/Sub-class
Apartment hotel A
Household Starred hotel
Appliance repair shops... MIXED
Housing, complex multi-storied Appliance stores (See appliances television, radio, F
Housing, cluster phonograph, or household appliance stores) F
Housing, low-income
Housing, minimum standard I MIXED (see appendix)
Housing, rehabilitation MIXED (see appendix)
Manufacture, dry or natural..... MIXED (see appendix)
Ice cream stores… MIXED (see appendix)
Ice MIXED (see appendix)
Incineration or reduction of BNBC 2015 FINAL DRAFTSales, open or enclosed Limited as to lot area… F
garbage, offal, or dead animals… Unlimited G or J (depending on the
Indoor facility, for amusement park process or material used)
Industrial buildings Low-hazard Industries
Moderate-hazard Industries F
Infirmaries F
Ink or inked ribbon manufacture G
Inns See residential I
Insecticides manufacture G1
G2
Institution For care of children C
Custodial, for physically capable adults G or J depending on nature of
Institutions, philanthropic or non- Custodial, for physically incapable adults materials involved
profit Penal or mental, for children A
Interior decorating establishments Penal or mental, for adults G or J depending on nature of
With sleeping accommodations...... materials involved
Irradiation plant Without sleeping accommodations… C1
Jail Limited as to floor area for processing, servicing, or C2
Jewelry repairs C3
C4
Junk Yards Unlimited, see furniture, textiles or upholstering C5
A
J
F
see prisons
F
Manufacture… J
Costume… G
G
From precious metals… G
F
Shops… Not applicable
3-68 Vol. 1
Classification of Buildings Based on Occupancy Chapter 2
Use or Occupancy Brief Description Occupancy Class/Sub-class
Jute products manufacture… G or J (depending on quantity
For children (see assembly) or process)
Juvenile correctional center
K H
Kennels B
Kindergarten See educational facilities G2
Knitwear industries
L E
Laboratories
Medical or dental, for research or testing, with (G or J) and H depending on
limitations on objectionable effects… process or material used in
Research, experimental, or testing, unlimited… compliance with safety
standards
Radiological laboratory, see radiological facilities
Pathological laboratory G (in compliance with safety
Microbiological laboratory, for diagnostic facility standards)
G or J depending on process or
Microbiological laboratory, for research material used in compliance
with safety standards
Microbiological laboratory, for academic facility G or J depending on process or
BNBC 2015 FINAL DRAFT material used in compliance
Lampblack manufacture… see public toilet with safety standards
Laundries, with no limitations on Tanning, curing, finishing or dyeing… G or J depending on process or
type of operation… Goods stores… material used in compliance
Laundry establishments, hand or Products manufacture… with safety standards
automatic self-service… Reading area (see assembly)
Lavatory, public Stack area (see storage) G
Leather Reading and stack area combined G
For children (see institutional)
Libraries... For adults (see residential) G
Lillah boarding Manufacture… J
Stores (See carpet stores)… F
Linen supply establishments… G
Linoleum Storage, more than six castles I
Slaughtering or preparation for packing... H
Liquor stores, package… MIXED (I and H)
Livestock C
A
J
F
H
G
Bangladesh National Building Code 2015 3-69
Part 3
General Building Requirements, Control and Regulation
Use or Occupancy Brief Description Occupancy Class/Sub-class
Loan offices… E
Locksmith shops… See residential F
Lodging Manufacture… A
Luggage Stores… G
Lumber Processing or woodwork, bulk… F
Sales, Limited as to lot area G
Machine Sales, Unlimited... G
Machinery Yard, Limited as to lot area.... G
Yard, Unlimited... G
G
M
G
Shops including tool, die or pattern making… G
Tools manufacture… G or J depending on material
Manufacture or repair, Heavy… and process
BNBC 2015 FINAL DRAFT G or J depending on material
Miscellaneous or electrical equipment… and process
F
Rental or sales establishments… F
Repair shops… H
F
Machines, business (See business machines) F
F
Madrasa (See institution) J
J
Manure storage
F
Markets Retail, including meat (See mercantile) F
G
Wholesale, produce or meat (See mercantile) G
G
Masseurs F
G
Matches manufacture
E
Mattress manufacture, rebuilding or Markets, Retail (See food stores)…
renovating E
Meat I
Markets, Wholesale… J
J
Medical Slaughtering or preparation for packing...
Appliances, Custom manufacture…
Appliances, Manufacture…
Stores…
Instruments, manufacture…
Laboratories (See laboratories, medical)
Offices or group medical centers, Limited as to
location within building…
Meeting halls Offices or group medical centers, Unlimited…
Mess houses See Assembly
Metal Fabrication industry (See residential)
Metal Assembly industry
3-70 Vol. 1
Classification of Buildings Based on Occupancy Chapter 2
Use or Occupancy Brief Description Occupancy Class/Sub-class
Metals manufacture Alloys or foil, miscellaneous… G
Casting or foundry products, heavy.... G
Mental institution Finishing, plating, grinding, sharpening, polishing, G
Mental hospitals cleaning, rust proofing, heat treatment, or similar
Mercantile processes… G
Mill Ores reduction or refining… G
Products treatment or processing… G
Reduction, refining, smelting, or alloying… G
Stamping or extrusion… G
Treatment or processing… D
Without detention facilities C
(See institution) F1
Small shops and markets F2
Large shops and markets F3
Refueling station G or J (depending on material
(See industrial and/ or hazardous buildings) or process)
BNBC 2015 FINAL DRAFT J
Mill works, and woodworking,
wood distillation and particle boards F
manufacturing G
Millinery shops G
M1
Mining machinery manufacture Including repairs… M2
MIXED
Mirror silvering shops F
Miscellaneous buildings Special structures G
I
Fences, tanks and towers A
MIXED (G and other
Monasteries Occupancies as required)
G
Monument Sales establishments, with incidental processing to G
order… G
Works, with no limitations on processing… F
K
Mosque (See assembly)
H
Motels (See residential) K
K
Motion picture production and Manufacture… I
filming facilities I
Motorcycles F
Repairs, body…
Repairs, except body repairs…
Sales open or enclosed…
Showrooms, with no repair services(See garage)
Motor freight stations See truck terminals
Motor vehicles Dead storage…
Moving or storage offices, Limited as to storage
Unlimited
Movie theatre See assembly
Museums See assembly
Music stores
Music studios See studios
Bangladesh National Building Code 2015 3-71
Part 3
General Building Requirements, Control and Regulation
Use or Occupancy Brief Description Occupancy Class/Sub-class
Musical instruments Manufacture, Excluding pianos and organs… G1
G2
Newspaper publishing Including pianos and organs… G1
Newsstands, open or closed Repair shops… MIXED (G and E)
Novelty products manufacture G
Novitiates… N E
Nuclear medicine facilities F
Nuclear plant Printing G
Nurseries Office A
Nursing homes
See institution J
Nursery schools see radiological facilities
Oakum products manufacture.... C or D depending on the type
Office equipment or machinery See agriculture of occupants and nature of use
repair shops… Philanthropic or non-profit… C or D depending on the type
Office or business machine stores of occupants and nature of use
Offices BNBC 2015 FINAL DRAFTPrivate
See pre-school B
Offices, small
O G
Oil cloth manufacture… F
Oil sales, open and enclosed
sales or rental F
Old home E
Optical General E
Orphanage
Optician or optometrist Business, professional or Governmental…(see E
establishments business occupancy) E
Orthopedic Dental, medical, or osteopathic (See medical offices)
Wholesale, with storage restricted to samples (see Non-separated use of
Osteopathic offices business occupancy) Occupancy A
Architect's/ engineer's/ consultant's (Limited to six E
occupants)
Architect's/ engineer's/ consultant's ( more than six J
occupants) F
J
Limited as to lot area......
C
Unlimited (See petroleum or petroleum products G
storage)… G
See institution C
F
Equipment manufacture…
Goods manufacture…
See institution
Appliances, Custom manufacture… G
Manufacture… G
Stores… F
Instruments, manufacture… G
(See medical offices)
3-72 Vol. 1
Classification of Buildings Based on Occupancy Chapter 2
Use or Occupancy Brief Description Occupancy Class/Sub-class
Packing or crating establishments P G2
Packing materials manufacture.... G2
Pagoda See Prayer hall
Paint Manufacture… J
Stores, limited to quantity… F
Painting contractors Stores, unlimited… H
Paper (See contractors' establishments)
Mills (See wood pulp or fiber)… G
Paper-hanging contractors Products manufacture… G
Parish houses Stock companies… H
Parks, public or private… (See contractors' establishments)
A
Park structures With provision for emergency vehicle access as part Not applicable
Parking garages, public of disaster preparedness program
Parking lots, public M
Passenger stations and terminals See garage, parking K
See garage, parking K
Small, passenger station MIXED (depending on nature
BNBC 2015 FINAL DRAFT of use)
Large, passenger station or terminal MIXED (depending on nature
of use)
Passenger and freight terminal MIXED (depending on nature
of use)
Peat storage compounding only, not including soap manufacture H
Perfumed or perfumed soaps J
Pest control Exempted quantity only F
Pet shops F
Petrol pump See refueling station F
Petroleum or petroleum products Refining… J
Storage and handling… J
Pharmaceutical products G or J depending on nature of
manufacture Repair shops… materials used
Philanthropic, religious or non-profit Stores (See appliances)… MIXED (depending on nature
activities Binding limited in quantity… of use)
Phonograph Developing or printing establishment, Retail F
Developing or printing establishment, Wholesale, F
Photocopying and book binding Limited as to floor area F
Photographic Developing or printing establishment, Wholesale, F
Unlimited H
Equipment, Manufacture (film)
Equipment, Manufacture (except film) H
Stores
Studios J
Supply stores (limited to exempted quantity) G
F
F
F
Bangladesh National Building Code 2015 3-73
Part 3
General Building Requirements, Control and Regulation
Use or Occupancy BNBC 2015 FINAL DRAFT Brief Description Occupancy Class/Sub-class
Photostatting establishments F
Physical culture establishments Products, manufacture........ I
Picture framing stores Raw, manufacture........ F
Plants, Industrial (See printing) G
Plants, Refrigeration With provision for emergency vehicle access as part G
Plastics of disaster preparedness program J
(See parking lots, public) J
Plate making Contractors' establishments
Playgrounds Equipment manufacturer (See tools or hardware I
manufacturing)
Plots, parking Showrooms, without repair facilities… F
Plumbing
Storage (live) F
Police Stations Killing establishments, for retail sales on the same E
Pool halls zoning lot only… I
Porcelain products manufacture Packing or slaughtering… G
Post offices E
Poultry As part of national grid power distribution system H
At consumer's end G
Power plant See assembly
Power stations Optical equipment, clocks, or similar products… G
Medical, dental, or drafting instruments, optical G
Prayer hall goods, or similar products… E
Precision instruments manufacture See educational L
I
Pre-school facilities See printing G
Press club, for journalist See educational G
Press, printing Custom…
Primary schools Limited as to floor area… I
Printing Unlimited…
G
Printing, publishing, dyeing and See jail G
printing industries G
Prisons With detention facilities (see institution) J
Produce or meat markets,
wholesale With printing C
Psychiatric sanatoria Without printing F
Public auction rooms Water or sewage (for city supply system)
Public transit yards Dedicated to consumer MIXED (F and/or I)
Publishing Not applicable
G
Pumping stations E
G
U
3-74 Vol. 1
Classification of Buildings Based on Occupancy Chapter 2
Use or Occupancy BNBC 2015 FINAL DRAFT Brief Description Occupancy Class/Sub-class
Quarter, Staff
Racetracks Q A or Mixed (See appendix)
Radio
Government or non-government I
Radio station F
Radiological facilities, medical R F
Radioactive waste disposal services Non-separated use to main
Railroad Appliance repair shops… Occupancy
Stores… E
Rail station Studios, with less than six occupants
Record stores Studios, without transmission tower… M
Recreation centers, non-commercial Studios, with transmission tower(see radio station) Mixed (depending on the type
Recreation piers Towers, non-accessory… of use)
Recreational vehicles manufacturing
Rectories In compliance with the standard of atomic energy D
Reducing salons commission
Reformatories J
Refreshments stand, drive-in… Equipment manufacture, including railroad cars or G or J depending on the
Refrigerating plants locomotives… material and hot-work used
Refueling station Passenger stations…
Refuse incinerators Right-of-way… I
Religious or church art goods Substations… Not applicable
manufacture..... Small or medium size…
Research establishment Large… G
Residences Railroads, including rights-of-way, freight terminals, G
yards or appurtenances, or facilities or services used Not applicable
or required in railroad operations, but not including
passenger stations… Mixed (depending on the type
of use)
See assembly
F
See institutional facilities I
I
Petroleum product storage within exempted quantity J
A
dealing with non-hazard or low hazard materials only I
Single-family detached…
One-family semi-detached or two-family detached or I
semi-detached… G
Boarding or rooming houses… E
Rest homes (See nursing homes) J
G
E
A
A
A
Bangladesh National Building Code 2015 3-75
Part 3
General Building Requirements, Control and Regulation
Use or Occupancy BNBC 2015 FINAL DRAFT Brief Description Occupancy Class/Sub-class
Residential Single family dwelling A1
Two family dwelling A2
Rest Houses Flats or apartments A3
Restaurant Mess, boarding house, dormitories and hostels A4
Hotels and lodging houses A5
Reviewing stand
Riding academies, open or enclosed Dining area I
Roofing contractors' establishments Performing area, limited I
Rooming houses Kitchen and storage L
Rubber I
See residential E and H
Rug stores Processing or manufacture, natural or synthetic F
Products manufacture (excluding all natural or A
Sail-making establishments synthetic rubber processing) J
Salvage storage (See carpet stores) J
Sand pits
Saloon, hair dressing S F
Sanatoriums H
With detention facilities (see institution) Not applicable
Sawmills Without detention facilities F
Scenery construction C
School (see educational) Dormitories, for children D
Nursery, kindergarten, elementary or secondary G
schools G
Trade or other schools for adults, limited as to C
objectionable effects... B
Trade schools for adults, unlimited....
For physically challenged, without accommodation B
For mentally challenged, without accommodation
B
Scrap metal, paper and rag storage See educational B
For 50 or more occupants, See assembly B
Secondary school (see housing)
H
Seed stores B
F
Seminar halls I
Seminaries B
Settlement houses MIXED (A and other Occupancy
depending on the nature of use
Sewage Disposal plants… G
Pumping stations… G
Sewing machine stores, selling F
household machines only.......
Ship chandlers, candle shops F
3-76 Vol. 1
Classification of Buildings Based on Occupancy Chapter 2
Use or Occupancy BNBC 2015 FINAL DRAFT Brief Description Occupancy Class/Sub-class
Ship or boat building or repair yards For ships 200 ft. in length or over.... G
Shipping, waterfront Manufacture…
Shoes Repair shops… Not applicable
Stores… G or J depending on the
Shops see definition process and material involved
Shop-house Limited as to floor area… F
Unlimited… F
Sign painting shops F or G (depending on the
Indoor… process and material involved)
Silk processing and spinning Outdoor… mixed occupancy (A and F) or
Silo, for storage of grain (A, F and G)
Silver plating shops, custom… Manufacture, including fat rendering… G
Silverware manufacture, plate or Packaging only… G
sterling J
Sisal products manufacture (See hostel) H
Skating rinks, roller G
Indoor or outdoor, with access for emergency vehicle G
Slag piles as part of disaster preparedness program
Slaughtering of animals or poultry… see quarter, staff J
Soap or detergents Rail, bus, air and water way I
I
Soldering shops… Miscellaneous fabrication or assembly (without hot- Not applicable
Solvent extracting… work)… G
Sorority houses Structural products manufacture… J
Sports centre G
Sporting equipment manufacture. G
Sporting goods stores… J
Stable for horses… A
Stadiums I
G
Staff quarter F
Stamp stores… H
Station I
Stationary stores… F
Statuary, mannequins, figurines, MIXED (I and other Occupancy
religious or church art goods depending on the nature of use
manufacture, excluding foundry
operations… F
Steel products G
Stock yards or slaughtering of G
animals or poultry
Stone processing or stone products J
G
G
Bangladesh National Building Code 2015 3-77
Part 3
General Building Requirements, Control and Regulation
Use or Occupancy Brief Description Occupancy Class/Sub-class
Storage buildings Low-fire-risk storage H1
Moderate-fire-risk storage H2
Storage facilities Wholesale (see storage buildings)… H
Offices, limited to quantity
Stores For cotton/jute/ paper/textile Non-separated use
Students' halls of residence See definition J
For children F
Studios For adults C
Music, dancing, or theatrical… A
Sugar Radio… (see radio studio) I
Super market Television, with spectator…
Swimming pools Television, without spectator… MIXED (I, E or G)
MIXED (depending on nature of
Table tennis halls… Production and Refining… material and process involved)
Tailor shops, custom…
Tanning (See leather or fur)… BNBC 2015 FINAL DRAFTSee mercantile J
Tapestries manufacture… F
Tar products manufacture… Commercial… I
Taxidermist shops… I
Telegraph offices… Non-Commercial (See clubs)....
Telephone exchanges or other I
communications equipment T F
structures… J
Television See assembly G
G
Television station F
E
Temple E
Tennis courts, indoor.....
Terminal facilities at river crossings Repair shops… F
for access to electric, gas, or steam Stores (See appliances)… F
lines… Studios (see television studios)
Test laboratory Towers, non-accessory… M
Textiles See business MIXED (E3 with other
Occupancies according to
Textile industries and jute mills See prayer hall… detail requirement)
Theater
I
G
involving low hazard material E
Bleaching (see industrial)… G
Products manufacture (see industrial)… G
G
Spinning, weaving, manufacturing, dyeing, printing,
knit goods, yarn, thread, or cordage (see industrial)… J
including canvas, cotton cloth, bagging burlap, carpet I
and rags (see industrial)
See assembly
3-78 Vol. 1
Classification of Buildings Based on Occupancy Chapter 2
Use or Occupancy Brief Description Occupancy Class/Sub-class
Theaters, drive-in...... (See studios)
Theatrical studios without spectator G
Tile Manufacture G
Tire sales establishments Including installation services, Limited to quantity F
Including installation services, unlimited quantity J
Tobacco Curing or manufacture, or tobacco products J
manufacture....
Toilet, public Stores (retail)… F
Toiletries manufacture L
See industries G or J depending on the
Tool or hardware manufacture… See storage material and process involved
Topsoil storage… See residential
Tourist cabins… G
Towel supply establishments… Manufacture… H
Toys Stores… A
Limited as to objectionable effects (see educational) F
Trade or other schools for adults G
BNBC 2015 FINAL DRAFT F
B
Trade expositions Unlimited (see educational)... B
Trailer, truck, bus Limited as to rated capacity…
Unlimited… I
Training center Manufacture, including parts…
I
Transit substations Repairs, body…
Transport terminal G or J depending on the
Sales open or enclosed… material and process involved
Travel agency Showrooms, with no repair services….
Travel bureaus lecture based, limited to quantity(see educational G or J depending on the
Truck facilities) material and process involved
vocational or demonstrative (see educational
facilities) F
Small or medium size… F
Large… E1 or B2
Small or medium size…
B2
Large…
G
(see business) G
(see business) MIXED depending on nature of
Manufacture (including parts) or engine rebuilding… use
MIXED depending on nature of
Repairs, body… use
Repairs, except body repairs… E
Sales open or enclosed… E
Showrooms, with no repair services… G or J depending on the
Trucking terminals or motor freight stations, Limited material and process involved
as to lot area… G
Trucking terminals or motor freight stations, G
Unlimited… F
F
K1
K1
Bangladesh National Building Code 2015 3-79
Part 3
General Building Requirements, Control and Regulation
Use or Occupancy Brief Description Occupancy Class/Sub-class
Tutorial homes More than six occupants (see educational) B
Turpentine manufacture.... J
Typewriter stores… F
Typewriter or other small business F
machine repair shops…
Typography (See printing)
Umbrellas U
University Manufacture… G
Upholstery F
Repair shops… B2
Utility J
See educational facilities J
Variety stores
Manufacturing
Varnish manufacture
Vehicles Bulk, including shops not dealing directly with
consumers…
Venetian blind, window shade, or
awning Shops dealing directly with consumers, retail… F
L
Ventilating contractors V
Ventilating equipment showrooms F
Video games shop Limited as to floor area… F
Vihara, Buddhist Unlimited… J
H
Wallpaper stores Dead storage of motor… G
Warehouses Manufacture, children's… K
Storage, commercial or public utility, open or
Watch or clock stores or repair enclosed…
shops BNBC 2015 FINAL DRAFT
Watch making Custom shops, limited as to floor area… F
Waterfront shipping Manufacture, with no limitation on production or on J or G depending upon nature
Water pumping stations floor area… of materials involved
(See contractors' establishments)
Water tank tower Without repair facilities..... F
Wax products manufacture… F
Weaving, hand… with occasional or regular assembly F
mixed use
W
H
Limited to quantity H or J (depending on the
nature of material stored)
F
At distributor's end G
At consumer's end Not applicable
Up to six hand-weaving machines G
More than six hand-weaving machines L
M
G
Non- separated use to main
Occupancy
G
3-80 Vol. 1
Classification of Buildings Based on Occupancy Chapter 2
Use or Occupancy Brief Description Occupancy Class/Sub-class
Wedding chapels… See assembly I
Arc welding only G
Welding shops…
Gas welding within exempted quantity G or J depending upon the
quantity of material and process
Welfare centers…
Wholesale establishments H or J depending upon the
nature of material
Wholesale offices or showrooms,
with storage restricted to samples… E
Window manufacture Custom shops, limited as to floor area… G
Window shades F
Manufacture, without limitation on production or on G
floor area…
Wood Bulk processing or woodworking... G
Distillation… G
Products manufacture… G
Pulp or fiber, reduction or processing, including G
paper mill operations….
BNBC 2015 FINAL DRAFT
Wool scouring or pulling… Sales, open or enclosed, Limited as to lot area… F
Workshops Unlimited (See lumber yards)… F
Woodworking shops, custom… J or G depending upon nature
X-ray facilities of materials involved
With hot-works G
Yard Without hot-works J
Yard, ship G
Yarn, manufacturing X
Not applicable
Zoo structures See radiological facilities
G or J depending on the
Y quantity (see Table 3.2.5)
See ship or boat building or repair yards M
Z
** The occupancy classification for any project, not included in this list, shall be determined through the following process:
i. The functional requirements of the unidentified occupancy shall be compared with the Occupancy use type, classification,
sub classification categories and descriptions to match with the given occupancies to find the most similar Occupancy,
ii. If process (i) fails to determine the Occupancy, the project will be referred to the Board of Appeal constituted as per
directives of Part 2 Chapter 2. The Board of Appeal shall determine the Occupancy, and
iii. The decision of Board of Appeal shall be considered as an explanatory material of this Code and shall be added as addendum
to this Code. For any future projects of similar nature this addendum will suffice and need not be referred to the Board of
Appeal again.
Bangladesh National Building Code 2015 3-81
BNBC 2015 FINAL DRAFTPart 3
General Building Requirements, Control and Regulation
This page is intentionally left blank.
3-82 Vol. 1
Chapter 3
CLASSIFICATION OF BUILDING
CONSTRUCTION TYPES BASED ON FIRE
RESISTANCE
3.1 GENERAL
3.1.1 Classification by Type of Construction
BNBC 2015 FINAL DRAFT
For the purpose of this Code, every room or space of a building or a building itself hereafter altered or erected
shall be classified in one specific type of construction as grouped as follows:
GROUP I: Noncombustible, subdivision:
Type I-A: 4 hour fire protected
Type I-B: 3 hour fire protected
Type I-C: 2 hour fire protected
Type I-D: 1 hour fire protected
Type I-E: Unprotected
GROUP II: Combustible subdivision:
Type II-A: Heavy timber
Type II-B: Protected wood joist
Type II-C: Unprotected wood joist
Type II-D: Protected wood frame
Type II-E: Unprotected wood frame
The fire resistance ratings of various types of construction for structural and nonstructural members are
specified in Tables 3.3.1 (a) and (b). For hazardous Occupancies involving an exceptionally high degree of fire
risk or an exceptionally high concentration of combustible or flammable content, the Authority may increase the
requirement of Table 3.3.1 (a).
Buildings having a height of more than 33 m shall be constructed with noncombustible materials.
The fire resistance ratings of various building components shall conform to ASTM standards.
No building or portion thereof shall be designated a given construction type unless it fully conforms to the
minimum requirements for that Construction type.
When a type of construction is utilized which is superior than the type of construction required by this Code,
there shall be no requirement to upgrade the rest of the construction to comply to that higher type of
construction and the designated construction type shall be that of the lesser classification, unless all of the
requirements for the higher classification are met.
Part 3 3-83
General Building Requirements, Control and Regulation
BNBC 2015 FINAL DRAFTPart 3
General Building Requirements, Control and Regulation
3.1.2 Group I: Non-Combustible Construction
Buildings or portion thereof in Non-combustible Construction Group I are those in which the walls, exit-ways,
shafts, structural members, floors, and roofs are constructed of non-combustible materials and assemblies
having fire-resistance ratings specified in Table 3.3.1 (a). The Non-combustible group consists of Construction
Type I-A, I-B, I-C, I-D and I-E.
3.1.2.1 Construction Type I-A
This construction type includes buildings in which the bearing walls and other major structural elements are
generally of four-hour-fire-resistance rating.
3.1.2.2 Construction Type I-B
This construction type includes buildings in which the bearing walls and other major structural elements are
generally of three-hour-fire-resistance rating.
3.1.2.3 Construction Type I-C
This construction type includes buildings in which the bearing walls and other major structural elements are
generally of two-hour-fire-resistance rating.
3.1.2.4 Construction Type I-D
This construction type includes buildings in which the bearing walls and other major structural elements are
generally of one-hour-fire-resistance rating.
3.1.2.5 Construction Type I-E
This construction type includes buildings in which the bearing walls and other major structural elements
generally have no fire-resistance rating.
3.1.3 Group II: Combustible Construction
Buildings or portion thereof in Combustible Construction Group II are those in which the walls, exit-ways, shafts,
structural members, floors, and roofs are constructed wholly or partly of combustible materials having fire-
resistance ratings specified in Table 3.3.1 (b). The Non-combustible group consists of Construction Type II-A, II-B,
II-C, II-D and II-E.
3.1.3.1 Construction Type II-A
This Construction type includes heavy timber construction in which fire-resistance is attained by-
(a) Limiting the minimum sizes of wood structural members and the minimum thickness and composition of
wood floors and roofs;
(b) Avoiding concealed spaces under floors and roofs or by providing fire-stopping protection for these
spaces; and
(c) Using fastening, construction details, and adhesives for structural members as required by this Chapter
and Part 4.
(d) The minimum dimensions for framing members shall be prescribed in this Chapter and Part 4, except that
members are protected to provide a fire-resistance rating of at least one hour need not comply with this
requirement.
3.1.3.2 Construction Type II-B
This Construction type includes buildings and portion thereof in which
(a) Exterior walls, fire walls, exit-ways, and shaft enclosures are of non-combustible materials having the
required fire-resistance ratings; and
(b) The floors, roofs and interior framing are wholly or partly of wood of smaller dimensions than required for
type II-A construction, or are of other combustible or non-combustible materials, having the required fire-
resistance rating.
3-84 Vol. 1
Classification of Building Construction Types Based on Fire Resistance Chapter 3
Table 3.3.1 (a): Fire Rating for Construction Group I: Non-Combustible
Exterior wall Construction TYPE -I-A TYPE -I-B TYPE -I-C TYPE -I-D TYPE -I-E
with Fire Element Ratings Exterior Ratings Exterior Ratings Exterior Ratings Exterior Ratings Exterior
Separation Exterior Wall in Hours Openinga,b in Hours Openinga,b in Hours Openinga,b in Hours Openinga,b in
Distance of Hours Openinga,b
0.9m or less Bearing 4 N.P 3 N.P 2 N.P 2 N.P 2 N.P
Non-bearingf 2 2 2 2 2
More than 0.9m Bearing 4 3 2 2 2
but less than Non-bearingf 2 as per 2 as per 2 as per 2 as per 2 as per
4.5m provisions provisions provisions provisions provisions of
4.5m or more Bearing 4 of this 3 of this 2 of this 1 of this 0 this Code
but less than Code Code Code Code
9.0m Non-bearingf 1½ 1½ 1 1 0
9.0m or more Bearing 4 N.L 3 N.L 2 N.L 1 N.L 0 N.L
Non-bearingf 0 0 0 0 0
Interior bearing walls and 4 3 2 1 0g,i
bearing partitions
Enclosure of vertical exitse, exit
passageways, hoistways and 2 2 2 2 2
BNBC 2015 FINAL DRAFT
shafts
Fire divisions and fire barrior See Table 3.2.1 and provisions of this Code
Walls or partitions or ceiling slab
Columnsk, Supporting one 3 2 1½ 1 0g,i
girders, floor 4 321 0g,i
trusses (other
than roof Supporting
trusses) and more than one
framing floorl
Structural members supporting Structural members shall have the same fire resistance rating of wall to be supported, but not less than rating
walls required by the construction classification.
Floor construction including 3 2 1½ 1 0g,i
beams
Roof 4.5m or less in
construction, height above
including floor to lowest 3 1½ 1i 1i 0g,i
2c,i or 1d,i 1½c,i or 1d,i 1i 1i 0g,i
beams, member of 2c,i or 0d,g,i 1½c,i or 1d,g,i 1c,i or 0d,g,i 1c,i or 0d,g,i 0g,i
trusses and ceiling
framing 4.5m to 6m in
including height above
arches, floor to lowest
domes, member of
shells, cable ceiling
supported
roofs and 6m or more in
roof decksh height above
floor to lowest
member of
ceiling
Shafts (other than exits) and 2 2 2 2 2
elevator hoistways
Fire separation wall and party 4 2 2 2 2
wall
Access corridor leading to fire 1 1 1 1 1
exits
Noncombustible Material ; N. P Not Permitted ; N. L No Limit
Bangladesh National Building Code 2015 3-85
Part 3
General Building Requirements, Control and Regulation
Table 3.3.1 (b): Fire Rating for Construction Group II: Combustible
Exterior wall Construction TYPE -II-A TYPE -II-B TYPE -II-C TYPE -II-D TYPE -II-E
with Fire Element
Separation
Distance of Exterior Wall Ratings Exterior Ratings Exterior Ratings Exterior Ratings Exterior Ratings Exterior
in Hours Openinga,b in Hours Openinga,b in Hours Openinga,b in Hours Openinga,b in Hours Openinga,b
0.9m or less Bearing 2 2 2 2 2
N.P N.P N.P N.P N.P
Non-bearingf 2 2 2 2 2
More than 0.9m Bearing 2 2 2 1 1
but less than Non-bearingf 2 as per 2 as per 2 as per 1 as per 1 as per
4.5m Bearing 2 provisions 2 provisions 2 provisions 1 provisions 0 provisions of
4.5m or more of this of this of this of this this Code
but less than Code Code Code Code
9.0m Non-bearingf 2 2 2 1 0
Bearing 1 1½ 1½ 1 0
9.0m or more N.L N.L N.L N.L N.L
Non-bearingf 0 0 0 0 0
Interior bearing walls and 2 1 0 1 0
bearing partitions
Enclosure of vertical exitse, exit
passageways, hoistways and
shafts
BNBC 2015 FINAL DRAFT2 2 1i 1i 1
Fire divisions and fire barrior Walls See Table 3.2.1 and provisions of this Code
or partitions or ceiling slab
Columnsk, Supporting one as per provisions of 1 0 or 1j 1 0
this Code 1 0 or 1j 1 0
girders, trusses floor
as per provisions of
(other than Supporting this Code
roof trusses) more than one
and framing floor
Structural members supporting 3 2½ 2 1½ 1
walls
Floor construction including as per provisions of 1 0 or 1j 1 0
beams this Code
Roof 4.5m or less in
construction, height above floor as per provisions of 3/4 0 3/4 0
0
including to lowest member this Code 0
beams, of ceiling
trusses and 4.5m to 6m in
framing height above floor as per provisions of
including to lowest member this Code 3/4 0 3/4
arches,
domes, shells, of ceiling
cable 6m or more in as per provisions of 3/4 0 3/4
supported height above floor this Code
roofs and roof to lowest member
decksh of ceiling
Shafts (other than exits) and 2 2 2 2 2
elevator hoistways
Fire separation wall and party 4 2 2 2 2
wall
Access corridor leading to fire 1 1 1 1 1
exits
Noncombustible Material ; N. P Not Permitted ; N. L No Limit
3-86 Vol. 1
Classification of Building Construction Types Based on Fire Resistance Chapter 3
Notes:BNBC 2015 FINAL DRAFT
a Requirements of protected exterior openings shall not apply to religious assembly. [Protected openings within an exterior
separation of 0.9m or less are permitted for buildings classified in Occupancy Groups A provided, however said openings do
not exceed in total area of 25% of the façade of the storey in which they are located. The openings however, may not be
credited towards meeting any of the mandatory natural light and ventilation as per provisions of this Code. Protection of
openings with an exterior separation of 0.9 m to 9 m shall not be required for A-1, A-2 and A-3 Occupancy groups] or to
buildings classified in Occupancy groups J, G and H additional requirements for exterior walls and exterior wall openings as
per provisions of this Code.
b Upon special application, the area development authorities may permit exterior wall openings to be constructed in excess of
the permitted area established by this Table if such openings at the time of their construction are located at least 18m in a
direct line from any neighboring building except as otherwise permitted in footnote f. Such additional openings may not
however be credited toward meeting any of the mandatory natural light and ventilation requirements of Sec 1.19 Chapter
Part 3 of this Code. If any neighboring building is later altered or constructed to come within the above distance limitation,
the affected exterior openings shall immediately be closed with construction meeting the fir-resistance ration requirements
for exterior wall construction of the building in which they are located.
c Applies to occupancy groups J, G and H
d Applies to occupancy groups J, G and H
e See Provisions of this Code for additional impact resistance requirements applicable to certain stair enclosures and for certain
exceptions to stair enclosure requirements.
f When two or more buildings are constructed on the Plot and the combined floor area of the buildings does not exceed the
limits established by this Code for any for the buildings, not fire-resistance rating shall be required for non-bearing portions of
the exterior walls of those buildings facing each other, and there shall be no limitation on the permitted amount of exterior
openings.
g Fire retardant treated wood complying with the requirements of this Code may be used.
h Tabulated ratings apply to buildings over one storey in height. In one storey building, roof construction may be of material
having zero hour fire-resistance rating.
i Materials which are not non-combustible as defined in this Code may be used in nonbearing construction elements as per
provisions for this Code.
1 Materials having a structural base of non-combustible materials as defined in this Code, and having a surface not over 3.2
mm thick which when tested in accordance with the provisions of this Code has a flame spread rating not higher than 50
(fifty).
2 Materials which when tested in accordance with the provisions of this Code have a surface flame spread rating not higher
than twenty five without evidence of continued progressive combustion, and which are of such composition that surface
which would be exposed by cutting through the material in any way would not have a flame spread ratings higher than
twenty-five without evidence of continued progressive combustion.
j Applies to the construction of the street floor and all construction below the level of the street floor in building or spaces
classified in occupancy group A-3 except where the space below the street floor does not exceed five feet in height.
k Columns supproting the roof of a one-story building shall have the same fire-resistance rating as required for a column
supporting one floor in a building of the same construction class.
l Members supporting loads of not more than two floors or one floor and a roof need not have a fire-resistance rating greater
than the floor construction fire-resistance requirement in buildings classified in occupancy groups B, C and A-3, not including
unsprinklered spaces of other occupancies, and in fully sprinklered buildings in occupancy groups E and A-5.
3.1.3.3 Construction Type II-C
This Construction type includes buildings and portion thereof in which
(a) Exterior walls, fire walls, exit ways, and shaft enclosures are of non-combustible materials having the
required fire-resistance ratings; and
(b) The floors, roofs and interior framing are wholly or partly of wood of smaller dimensions than required for
type II-A construction, or are of other combustible or non-combustible materials, having no required fire-
resistance rating.
3.1.3.4 Construction Type II-D
This Construction type includes buildings and portion thereof in which exterior walls, bearing walls, floors, roofs,
and interior framings are generally of wood or other combustible materials having the required fire-resistance
ratings.
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3.1.3.5 Construction Type II-E
This Construction type includes buildings and portion thereof in which
(a) The exterior walls are generally of wood or other combustible materials having the required fire-
resistance ratings, and
(b) In which the bearing walls, floors, roofs, and interior framing are of wood or other combustible materials,
generally having no fire-resistance ratings.
3.1.4 Separated Occupancy and Construction
When two or more occupancies accommodated in a building, each such occupancy shall be separated according
to the provisions specified in Sec 2.3 Chapter 2 Part 3 and Table 3.2.1.
When two or more types of construction used within a building, the entire building shall be subject to the most
restrictive construction type and shall comply with FAR restrictions as per provisions of this Code.
However if the Occupancies within the different Types of Construction are completely separated by
construction that meets the fire-resistance rating requirements for fire separation listed in Table 3.2.1 of
Chapter 1 Part 3 then each Occupancy so separated may, for the purpose of this Code, be considered as
separate building section.
BNBC 2015 FINAL DRAFT
3.1.4.1 Restriction for mixed construction
In buildings of mixed construction, no structural element shall be supported by construction having a lower fire-
resistance rating than that required for the element being supported.
3.1.5 Fire Zones
The planning and development authority of the city, township, municipality or region where this Code is
intended to be implemented shall divide the area under their jurisdiction into distinct fire zones. The basis for
this zoning shall be the fire hazard inherent in the buildings and the degree of safety desired for the occupancy
accommodated therein. The number of zones in an area shall depend on its size and the strategies undertaken
for its development.
3.1.5.1 Fire Zone 1
The following occupancy groups shall comprise this zone:
Occupancy A: Residential Occupancy F: Mercantile
Occupancy B: Educational Occupancy H: Livestock Storage Building
Occupancy C: Institutional for Care Occupancy I: Assembly
Occupancy D: Health Care Occupancy K: K1 and K2 Parking
Occupancy E: Offices Occupancy M: Miscellaneous Buildings
3.1.5.2 Fire Zone 2
The following occupancy groups shall comprise this zone:
Occupancy G: Industrial Buildings
Occupancy H: Storage Buildings
Occupancy K: K3 Parking
3.1.5.3 Fire Zone 3
The only occupancy falling in this zone shall be Occupancy J, Hazardous Buildings.
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3.1.5.4 Change in Fire Zone BoundariesBNBC 2015 FINAL DRAFT
The demarcations of fire zones may be changed or new occupancies may be included in any fire zone through
the same procedure as for promulgating new rules or ordinances or both.
3.1.5.5 Buildings on overlapping fire zones
Buildings falling on more than one fire zones shall be considered to be situated on the zone in which the major
portion of the building falls. If a building is divided equally between more than one fire zones, it shall be
considered as falling in the fire zone having more hazardous occupancy buildings.
3.1.5.6 Restrictions on temporary constructions
Permission may be granted by the Authority for temporary constructions only in fire zones 1 and 2 and not in
fire zone 3. Such temporary constructions shall adhere to the conditions of the permission and shall be
demolished and removed completely after the expiry of the duration of the permission unless it is extended by
the Authority or a new permission is obtained.
3.1.6 Permissible Types of Construction for Various Occupancies
3.1.6.1 New buildings
Types of constructions permitted for various buildings on the basis of fire zones are specified in Table 3.2.4.
3.1.6.2 Existing buildings
Existing buildings in any fire zone need not comply with the provision of this Code for type of construction
unless they are altered or in the opinion of the Authority they constitute a hazard to the safety to the occupants
of the buildings or the adjacent properties.
3.1.7 Exterior Walls
The fire resistance rating of the exterior walls shall conform to the provisions set forth in Table 3.2.2 and
Sec 3.2.3.
3.1.8 Basement Floor
Basement floor of a building shall be enclosed with a one hour fire resistive construction. Doors in such
constructions shall be made of noncombustible materials.
3.1.9 Restricting Horizontal and Vertical Spread of Fire
Generally walls restrict horizontal movement and slabs restrict vertical movement of fire.
3.1.9.1 Interior or barrier or enclosure wall
Propagation of fire, smoke, gas or fume through the openings or shafts or penetrations of fire resistive floors
and walls shall be restricted by sealing with an approved material which shall have a fire resistance rating at
least equal to that of the floor-wall assembly. The sealing material shall be capable of preventing passage of
flame and hot gases sufficient to ignite cotton waste when tested in accordance with ASTM E119.
3.1.9.2 Exterior walls
Permitted unprotected openings in the exterior wall in two consecutive floors lying within 1.5 m laterally or
vertically shall be separated with flame barriers as similar as sunshades or cornices or projected wall at least 750
mm from the external face of the exterior wall. The flame barrier shall have a fire resistance rating of not less
than three-fourths hour.
3.1.10 Exceptions to Fire Resistance Requirements
The provisions of this Section are exceptions to the occupation separation requirements of Table 3.2.1.
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General Building Requirements, Control and Regulation
3.1.10.1 Fixed partitions
(a) Stores and Offices: In such cases where offices, stores and similar places occupied by one tenant are
separated by non-load bearing walls that do not form a corridor serving an occupant load, the partition
walls may be constructed of any one of the following:
(i) Noncombustible materials;
(ii) Fire retardant treated wood;
(iii) One hour fire resistive construction;
(iv) Wood panels or similar light construction up to three fourths the height of the room in which placed;
and
(v) Wood panels or similar light construction more than three-fourths the height of the room in which
placed with not less than upper one fourth of the partition constructed of glass.
(b) Hotels and Apartments: In such cases where non-load bearing walls act as interior partitions in individual
dwelling units in apartment houses and guest rooms or suites in hotels when such dwelling units, guest
rooms or suites are separated from each other and from corridors by not less than one-hour fire-resistive
construction, the partition walls may be constructed of any one of the following:
BNBC 2015 FINAL DRAFT
(i) Noncombustible materials of fire retardant treated wood in buildings of any type of construction; or
(ii) Combustible framing with noncombustible materials applied to the framing in buildings of Type II
construction.
(c) Folding, Portable or Movable Partitions: Folding, portable or movable partitions need not have a fire
resistance rating if the following conditions are satisfied:
(i) Required exits are not blocked without providing alternative conforming exits;
(ii) Tracks, guides or other approved methods are used to restrict their locations; and
(iii) Flammability shall be limited to materials having a flame-spread classification as set forth in Table 3.3.2
for rooms or areas.
Table 3.3.2: Flame Spread Classification
Class Flame Spread Index
I 0-25
II 26-75
III 76-200
(d) Walls Fronting on Streets or Yards: For walls fronting on a street or yard having a width of at least 12 m,
certain elements of the wall may be constructed as follows regardless of their fire-resistive requirements:
(i) Bulkheads below show windows, show window frames, aprons and show-cases may be of combustible
materials provided the height of such construction does not exceed 5 m above grade.
(ii) Wood veneer of boards not less than 25 mm in nominal thickness or exterior type panels not less than
10 mm in nominal thickness may be used in walls provided:
·the veneer does not extend beyond 5 m above grade; and
·The veneer is placed either directly against noncombustible surface or furred out from such surfaces
not to exceed 40 mm with all concealed spaces fire blocked.
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Classification of Building Construction Types Based on Fire Resistance Chapter 3
(e) Trim: Wood may be used to construct trim, picture moulds, chair rails, baseboards, handrails and showBNBC 2015 FINAL DRAFT
window backing. If there is no requirement for using fire protected construction, unprotected wood doors
and windows may be used.
(f) Loading Platform: Noncombustible construction of heavy timber may be used for exterior loading platforms
with wood floors not less than 50 mm in nominal thickness. Such wood construction shall not be carried
through the exterior walls.
(g) Insulating Boards: Combustible finished boards may be used under finished flooring.
3.1.11 Shaft Enclosures
3.1.11.1 General
Construction requirement for shafts through floors shall conform to the provisions of Tables 3.3.1 (a) and (b).
3.1.11.2 Extent of enclosures
Shaft enclosures shall extend from the lowest floor opening through successive floor openings and shall be
enclosed at the top and bottom.
Exceptions:
(a) Shafts need not be enclosed at the top if it extends through or to the underside of the roof sheathing, deck
or slab.
(b) Noncombustible ducts carrying vapours, dusts or combustion products may penetrate the enclosure at the
bottom.
(c) Shafts need not be enclosed at the bottom when protected by fire dampers conforming to "Test Methods
for Fire Dampers and Ceiling Dampers", installed at the lowest floor level within the shaft enclosure.
3.1.11.3 Special provision
In groups other than Occupancies C and D, openings which penetrate only one floor and are not connected with
any other floor or basement and which are not concealed within building construction assemblies need not be
enclosed.
3.1.11.4 Protection of openings
Openings in shaft enclosures shall be protected with a self-closing or an automatic-closing fire assembly having a
fire resistance rating of
(a) one hour for one hour fire resistive walls
(b) one and one-half hours for two hour fire resistive walls
3.1.11.5 Rubbish and linen chute termination rooms:
Rubbish and linen chute shall terminate in rooms separate from the remaining of the building having the same
fire resistance as required for shafts in Table 3.3.1 (a) and (b) but not less than one hour.
3.1.12 Expansion and Contraction Joints
Expansion and contraction joints provided to accommodate expansion, contraction, wind or seismic movement
shall be protected with an approved material having the same degree of fire resistance as that of the wall or
floor in which it is installed.
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3.1.13 Weather Protection
3.1.13.1 Weather resistive barrier:
All weather exposed surfaces shall have a weather barrier to protect the interior wall from damping. Such
weather barriers shall have a fire resistance rating of at least equal to that of the wall or floor on which it is
applied. Weather resistive barrier need not be used in the following cases:
(i) When exterior covering is of approved waterproof panels
(ii) In back plastered construction
(iii) When there is no human occupancy
(iv) Over water repellent panel sheathing
(v) Under approved paper backed metal or wire fabric lath
(vi) Behind lath and Portland cement plaster applied to the underside of roof and eave projections
3.1.13.2 Flashing and counter flashing
Exterior openings exposed to the weather shall be flashed to make them weather proof. There shall be copings
with all parapets. Corrosion resistant metals shall be used for flashing, counter flashing and coping.
3.1.13.3 Waterproofing weather-exposed areas
Waterproofing shall be applied to exposed surfaces like balconies, external stairways and landings.
3.1.13.4 Damp-proofing foundation walls
Outside of foundation walls enclosing a basement floor below finished grade shall be damp-proofed from
outside.
3.1.14 Members Carrying Walls
All members carrying masonry or concrete walls shall be fire protected as specified in Table 3.3.1 (a) and (b).
3.1.15 Parapets
Parapets constructed on exterior wall of a building shall have the same degree of fire resistance required for the
wall upon which they are erected and there shall be noncombustible faces on the side adjacent to the roof
surface for the uppermost 405 mm including counter flashing and coping materials. The height of the parapet
shall be at least 750 mm from the upper surface of the roof.
3.1.16 Projections
Sunshades, cornices, projected balconies and overhanging beyond walls of Type I construction shall be of
noncombustible materials. Projections from walls of Type II may be of combustible or noncombustible
materials.
3.1.17 Guards and Stoppers
3.1.17.1 Guards
Guards or Guardrails shall be provided to protect edges of floor, roof, roof openings, stairways, landings and
ramps, balconies or terraces and certain wall, which are elevated more than 750 mm above the grade and as per
provisions of this Code.
3.1.17.2 Stoppers
Stopper shall be provided in open parking garages located more than 450 mm above the adjacent grade or back
to back parking stall. The height of the stopper shall be at least 300 mm and it shall be positioned at outer edges
of a car parking stall.
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3.1.18 Insulation
The provisions of this Section are applicable to thermal and acoustical insulations located on or within floor-
ceiling and roof ceiling assemblies, crawl spaces, walls, partitions and insulation on pipes and tubing.
Materials used for such insulation and covering shall have a flame spread rating not more than 25 and a smoke
density not more than 450.
3.1.19 Atrium
3.1.19.1 General
Atrium may be provided in all groups other than Occupancy J (Hazardous Buildings). Such atrium shall have a
minimum opening and are as specified in Table 3.3.3.
Table 3.3.3: Atrium Opening and Area
Height in Stories Minimum Clear Opening¹ (m) Minimum Area (m2)
40
2-4 6
5-7 9 90
BNBC 2015 FINAL DRAFT
8 or more 12 160
1 The specified dimensions are the diameters of inscribed circles whose centers fall on a common
axis for the full height of the atrium.
3.1.19.2 Smoke control system
A mechanically operated air-handling system shall be installed to exhaust the smoke either entering or
developed within the atrium.
(a) Exhaust Openings: The location of the exhaust openings shall be in the ceiling or in a smoke trap area
immediately adjacent to the ceiling of the atrium above the top of the highest portion of door openings
into the atrium.
(b) Supply Openings: Supply openings designed for a minimum of 50 percent of the exhaust volume shall
be located at the lowest level of the atrium. Supply air may be introduced by gravity provided the
height of the atrium is not more than 18 m and smoke control is established. For atria having height
greater than 18 m, supply air shall be introduced mechanically from the floor of the atrium and directed
vertically toward the exhaust outlets. Supplemental air supply may be introduced at upper levels in
atrium over six storeys in height or when tenant spaces above the second storey are open to the
atrium.
(c) Automatic Operation: The smoke control system for the atrium shall be activated automatically by the
automatic sprinkler system or smoke detectors installed within the atrium or areas open to the atrium.
(d) Manual Operation: The smoke control system shall also be manually operable for use by the fire
department. The smoke control system may be separate from or integrated with other air handling
systems. Air handling systems interfering with the smoke control system shall be shut down
automatically when the smoke control system is activated.
(e) Smoke Detector Location: Smoke detectors which will automatically operate the smoke control system
of the atrium shall be accessible for maintenance, testing and servicing. Their locations shall be as
follows:
(i) At the atrium ceiling, spaced in accordance with the manufacturer's instructions.
(ii) On the underside of projections into the atrium, in accordance with the manufacturer's
instructions.
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General Building Requirements, Control and Regulation
(iii) Around the perimeter of the atrium opening on all floors open to the atrium. These detectors shall
be spaced no more than 9 m on centre and shall be located within 5 m of the atrium opening.
(iv) If projected beam type smoke detectors are used, they shall be installed in accordance with
manufacturer's instructions.
(f) Enclosure of Atrium: A trial shall be separated from the adjacent spaces with fire resistive separation of
at least one hour.
Fire windows may be provided in fixed glazed openings when the window has a fire resistive rating of at
least three-fourths hour and the area of the opening does not exceed 25 percent of the wall common to
the atrium and the room into which the opening is provided.
3.1.20 Mezzanine Floors
Construction of a mezzanine floor shall conform to the requirements of the main floor in which it is constructed
but the fire resistance rating need not exceed one hour for unenclosed mezzanines.
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Chapter 4
ENERGY EFFICIENCY AND SUSTAINABILITY
4.1 SCOPE
The purpose of including this Chapter in the Code is to enhance the design and construction of buildings through
the use of building concepts having a positive environmental impact and encourage sustainable construction
practices, allowing efficiency and conservation of energy, water and building materials, and to promote
resource efficiency.
In addition to the clauses stipulated here, all Codes and standards relevant to a building occupancy as set forth
in other Sections of this Code will be applicable during implementation.
Design and drawings will be submitted to indicate the location, nature and scope of the proposed energy
efficient/sustainable feature. These shall indicate compliance to the provisions of this Code, and will be supplied
by the relevant design professionals, e.g. electrical engineers, mechanical engineers, plumbing engineers, etc.,
supporting architectural drawings.
4.1.1 Rationale for Sustainable/Green Buildings
Climate change is an established phenomenon affecting the environment globally and it is recognized that
buildings and the built environment play a vital role in the process, impacting on the natural environment and
the quality of life. Sustainable development concepts and approaches applied to the design, construction and
operation of buildings or to any built environment can enhance both the economic and environmental benefits
of the community in Bangladesh and around the world. Energy efficiency and sustainability is not an
individual issue rather an integrated and inseparable part of the building design and construction
process. The benefits of sustainable design principles include resource and energy efficiency, healthy buildings
and materials, ecologically and socially sensitive land use and strengthened local economics and the
communities, objectives vital for future development of Bangladesh.
BNBC 2015 FINAL DRAFT
4.2 DEFINITIONS
DAYLIGHT ZONE An area with a depth of 5 m parallel to any glazed external wall.
EMERGENCY Lighting used for emergency spaces and functions, e.g. in fire stairs, for egress path
LIGHTING signage.
GREY WATER Waste water generated from wash hand basins, showers and baths, Grey water often
excludes discharge from laundry, dishwashers and kitchen sinks due to the high nutrient
levels. It differs from the discharge of WC's which is designated sewage or black
water to indicate it contains human waste.
REGULARLY All the main areas in the buildings that are used on a frequent basis, such as living
OCCUPIED SPACE rooms, bedrooms, classrooms, lobbies, meeting rooms, hall rooms and office spaces.
Service spaces like toilets, bathrooms, corridors and stores will not be considered as
frequently occupied areas.
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WINDOW TO WALL The window-to-wall ratio of a building is the percentage of its facade taken up by light-
RATIO OF BUILDING transmitting glazing surfaces, including windows and translucent surfaces such as glass
(WWRB) bricks. It does not include glass surfaces used ornamentally or as cladding, which do not
provide transparency to the interior. Only facade surfaces are counted in the ratio, and
not roof surfaces.
LIGHTING POWER Average total lighting power installed divided by the total occupied area.
DENSITY (LPD)
SHADING The ratio of solar heat gain at normal incidence through glazing to that occurring
COEFFICIENT (SC) through 1/8 inch thick clear, double-strength glass. Shading coefficient, as used herein,
does not include interior, exterior, or integral shading devices.
SOLAR HEAT GAIN An indicator of glazing performance is the amount of heat admitted through the glass
COEFFICIENT vis-à-vis the total heat incident on the glass by virtue of direct solar radiation. The unit is
(SHGC) a simple fraction or percentage.
U-VALUE (THERMAL Heat transmission in unit time through unit area of a material or construction and the
TRANSMITTANCE) boundary air films, induced by unit temperature difference between the environments
on each side. Units of U-value are W/m2/ok
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VISIBLE LIGHT Amount of light transmitted through glazing, expressed as a simple fraction or
TRANSMITTANCE percentage
(VLT)
4.3 SITE SUSTAINABILITY
This Section deals with sites to ensure energy efficiency through passive and low energy architectural features
and management of resources.
4.3.1 Mandatory Unpaved Area
Fifty (50) percent of mandatory open space shall be permeable on sites of all occupancy categories. The
permeable area shall not remain bare generating dust, but will have green cover or be treated with perforated
paving (≥ 50%), organic mulch, charcoal, etc.
4.3.2 Site Drainage and Run-Off Coefficient
Designs shall indicate site drainage considerations along with flash flooding and erosion prevention measures
for sites above 1340 m2 in area. As excessive paving is largely responsible for fast water run-off and flash
flooding, design shall indicate measures taken to make paving permeable. The net run-off from a site shall be a
maximum of sixty (60) percent. The following method will be used for the calculations, in conjunction with Table
3.4.1:
Total Perviousness on Open Area of Site (Ap) = A1 x C1 + A2 x C2 + . . . (3.4.1)
Where, A1, A2, etc., being the areas of various surfaces, e.g. Pavements, roads, vegetation, etc., with different
run-off coefficients C1, C2, C3 etc., shown in the Table 3.4.1.
4.3.3 Vegetation Plan
For sites above three (3) acres, it is mandatory for a vegetation plan to be submitted along with the site plan and
Irrigation Plan, where priority shall be given to native plants in the selection for planting.
4.3.4 Irrigation Plan
4.3.4.1 For sites above ten (10) acres, an irrigation plan with construction details shall be submitted with the
site plan, where considerations shall include for management of rainwater.
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4.3.4.2 For these sites a retention pond of ≥ 3% of site area shall be provided. This shall include any existing
natural water body within the site.
Table 3.4.1: Run-Off Coefficient`s of Various Surfaces Run-Off Coefficient, C
Surface Type 0.95
Roofs, conventional
Green Roofs (soil/growing medium depth ≥ 300 mm) 0.45
Concrete paving 0.95
Gravel 0.75
Brick paving 0.85
Vegetation:
1-3% 0.20
3-10% 0.25
>10% 0.30
Turf Slopes:
0-1%BNBC 2015 FINAL DRAFT 0.25
1-3% 0.35
3-10% 0.40
>10% 0.45
4.3.5 Rain Water Harvesting System
4.3.5.1 Buildings of total floor area > 4000 m2 shall have its own rain water harvesting system as discussed in
Chapter 7 Part 8 and installed complying with Section 7.13 Part 8, of this Code. The reservoir capacity shall be a
multiple of the area of Ground Coverage of the building and a rain collection coefficient of 0.073.
4.3.5.2 The rainwater reservoir may be placed under the roof or at lower levels, including underground.
4.4 EPVLEVNE BNIBLIUB
4.4.1 Window to Wall Ratio
4.4.1.1 For mechanically ventilated and cooled buildings of all occupancies, other than Hazardous and Storage,
the Window to Wall ratio of building (WWRB), will be determined in conjunction with the glazing performance,
as indicated by the Solar Heat Gain Coefficient (SHGC) or Shading Coefficient (SC) of the glass used. The
relationship is given in Figure 3.4.1 and Table 3.4.2.
Figure 3.4.1 Selection of glazing SHGC based on WWR 3-97
Bangladesh National Building Code 2015
Part 3
General Building Requirements, Control and Regulation
Table 3.4.2 Selection of Glazing SHGC Based on WWR in Tabular Format
WWR SHGC SC
10 0.85 0.98
20 0.6 0.69
30 0.5 0.57
40 0.4 0.46
50 0.35 0.4
60 0.33 0.38
70 0.31 0.36
80 0.3 0.34
90 0.27 0.31
4.4.1.2 In all of the above cases, the Visible Light Transmittance (VLT) of the glazed element shall not be lower
than thirty five (35) percent.
4.4.1.3 For Air-conditioned buildings with external shading, permitted SGHC limit may be adjusted, but the
increase shall not exceed values determined by Eq. 3.4.2 below:
BNBC 2015 FINAL DRAFT
= + (3.4.2)
Where,
is the adjusted solar heat gain coefficient limit for windows with shading
SHGC is the solar heat gain coefficient from Table 3.4.2
A is the SHGC correction factor for the external shading as per Table 3.4.3 or Table 3.4.4: . For a window with
overhang and fin, the value of A can be only used either from overhang or from fin.
4.4.1.4 For naturally ventilated buildings, window size shall be based on Sec 4.4.2 Window Openings of this
Code and shading shall be provided as per Sec 4.4.3.
4.4.1.5 Window size shall under no circumstances be less than as stipulated under Part 3: Chapter 1, Section
1.17 of this Code.
Table 3.4.3: Correction Factor against Overhang Shading Projection Factor
Overhang Projection Factor SHGC Correction Factor(A)
0.0 0.00
0.1 0.05
0.2 0.09
0.3 0.14
0.4 0.19
0.5 0.24
0.6 0.28
0.7 0.33
0.8 0.38
0.9 0.43
1 or higher 0.47
Projection factor for overhang is the depth of the overhang divided by
the height of the window
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Table 3.4.4: Correction Factor against Vertical Shading (fins) Projection Factor
Vertical Shading (Fins) Projection Factor SHGC Correction Factor (A)
0.0 0.00
0.1 0.04
0.2 0.08
0.3 0.12
0.4 0.16
0.5 0.20
0.6 0.24
0.7 0.28
0.8 0.32
0.9 0.36
1 or higher 0.40
Projection factor of fins is the depth/length of fin divided by the width of the
window.
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4.4.2 Window Openings
Mechanically ventilated and cooled buildings of all occupancies, other than hazardous, retail and storage, shall
have the provision of using natural ventilation for cooling and fresh air, in frequently occupied areas , with a
fraction > 4% of the floor area being specified as openable windows. Openable balcony doors can be counted in
this calculation. Note if the window area defined under Sec 4.4.1 is less than openable area, then fifty (50)
percent of window area should be openable.
4.4.2.1 Naturally ventilated buildings of all occupancies, other than hazardous and storage, shall provide for
fifty (50) percent of its window area to be openable.
4.4.2.2 All the openable windows above ground should be designed with safety measures in place such as
protection hand rails for child safety.
4.4.2.3 Windows to any regularly occupied space on exterior walls in naturally ventilated buildings shall be
shaded conforming to Sec 4.4.3.
4.4.3 Shading
4.4.3.1 For naturally ventilated buildings of all occupancies, horizontal sunshades shall be provided over
windows on South, East and West, the depth of which shall be calculated by multiplying the window height with
a factor of 0.234 (Figure 3.4.2). Horizontal louvers can be used instead of sunshades, in which case, depth of
louver shall not be less than 0.234 times the gaps between the louvers (Figure 3.4.3).
4.4.3.2 Vertical Shading devices shall be provided on the West, depth of which shall be calculated, by
multiplying the gaps between the vertical fins, or the window width if the shades border the window width,
with a factor of 0.234 (Figure 3.4.4).
Exceptions:
(a) The above rule shall be relaxed if it can be demonstrated that shading is achieved by existing
neighbouring structures.
(b) The north side of all buildings are exempt from the above rules.
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Figure 3.4.2 Horizontal shade: x ≥ 0.234y
Figure 3.4.3 Horizontal Louvres: relationship between depth (x) and gap (y): x ≥ 0.234y
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Figure 3.4.4 Vertical shading or louvres: relationship between depth (x) and gap (y): x ≥ 0.234y
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4.4.4 Roof Insulation and Green Roofing SystemBNBC 2015 FINAL DRAFT
4.4.4.1 Fifty (50) percent of horizontal exposed roof slabs of Buildings of Occupancy B, C, D and E, shall have
green roofing system, to manage water run-off from roof tops, to control internal temperatures within the top
floors and to reduce the carbon footprint of the building. This shall not include any covered roof surface, e.g.
solar panels, solar thermal heaters, machinery for mechanical or electrical systems, water tanks, etc. Stair loft or
machine room tops will be exempt from this rule.
(a) The roof slab design shall consider structural support of the green roof system, with growing medium of
minimum 300 mm.
(b) The design will indicate protection from dampness and provide a drainage system
4.4.4.2 Horizontal roof slabs, which are not covered by green roofing system, will have roof slabs with
insulation, so that the time lag and decrement factor is greater than the other floor slabs of the building.
4.5 ENERGY EFFICIENT BUILDING SYSTEMS
4.5.1 Daylighting and Supplementary Lighting System
4.5.1.1 Window area shall not be less than 14 percent or 1/7th of the total floor area of the building
4.5.1.2 Every regularly occupied space shall contain a minimum percentage of day-lit area along the building
perimeter zones, with no window less than an area of 1 m2 and will ensure the appropriate stipulations given
below.
(a) for rooms that measure less than 8 m in depth, window area shall be at least 20 percent of the area of
the external wall of the room,
(b) for rooms that measure between 8 to 14 m in depth, window area shall be at least 30 percent of the
area of the external wall of the room and 35 percent of the external wall
(c) for rooms that measure more than 14 m in depth, window area shall be at least 35 percent of the area
of the external wall of the room
4.5.1.3 For Buildings of Occupancy A5, B, C, E1 and E2, photoelectric sensors shall be connected to luminaires,
to enable dimming or switching off lamps that do not require to be operated, due to the presence of adequate
daylight. The photoelectric sensor shall be located approximately at half (½) the depth of day-lit zone.
4.5.1.4 If occupancy sensors are installed in the daylight area, the occupancy sensor shall override the daylight
sensor during non-occupancy period.
Exceptions:
(a) Zones with special requirements are exempt from the stipulation of Sec 4.5.1.3. The designer shall
justify the reason for exemption.
(b) Hotel guest rooms are exempt.
4.5.2 Lighting Power Density
4.5.2.1 Lighting Power Density (LPD) of the values set in Table 3.4.5 shall be provided for the respective
functions within all building occupancies, or as specified.
4.5.2.2 In addition to Sec 4.5.2.1, Illumination values (Lux) as specified in Tables 8.1.5 to 8.1.14 of Part 8 of this
Code shall be provided for buildings of the respective occupancies.
4.5.3 Occupancy Sensors
4.5.3.1 In order to limit the use of electricity in the unoccupied areas of buildings, occupancy sensors linked to
lighting (except for emergency and security lighting) shall be installed in the public areas of buildings of
occupancies specified in Table 3.4.6.
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Table 3.4.5: Maximum Allowable Lighting Power Density for Different Occupancies
Occupancy Maximum LPD (W/m2)
E1 and E2: Offices 9
F1 and F2: Retail/Mercantile 13
A5: Hotels 9
D1: Hospitals 11
A1, A2 and A3: Apartments/residences 7
B: Educational 11
All occupancies: Covered parking* 3
All occupancies: Open / outdoor parking 1.6
* LPD for car parks shall calculated from the total lighting power divided by the
total car park area
Table 3.4.6: Applicability of Occupancy Sensors
Occupancy Applicability
E1 and E2 Offices Meeting rooms and corridors
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A5 Hotels Meeting rooms and corridors
A3 Apartments Covered car parks and corridors
B Educational Covered car parks and corridors
4.5.3.2 For car parks a minimum 2/3rd of the lighting shall be controlled by occupancy sensors.
4.5.3.3 Emergency lighting shall not be connected to occupancy sensors.
4.5.4 Ceiling/ Wall Mounted Fans
4.5.4.1 For naturally ventilated buildings of occupancy A, ceiling/wall mounted fans shall be provided in each
regularly occupied space.
4.5.4.2 For buildings of occupancy B, C, D, E and I, ceiling/wall mounted fans shall be provided in each room
larger than 25 m2, with a minimum of one fan every 25 m2.
Exceptions:
(a) Corridors of buildings of all occupancies
(b) ICU, CCU, operating theatres of Hospitals and Clinics
4.5.5 Lift and Escalator Efficiencies
4.5.5.1 Escalators, in buildings of all occupancies, shall be fitted with controls to reduce speed or to stop when
no traffic is detected.
4.5.5.2 Such escalators shall be designed with one of the energy saving features as described in i or ii below:
Reduced speed control: The escalator shall change to a slower speed when no activity has been detected for a
period of a maximum of three (3) minutes. Detection shall be by photocell activation at the top and bottom
landing areas.
Use on demand: The escalator shall shut down when no activity has been detected for a period of a maximum of
fifteen (15) minutes, designed with energy efficient soft start technology. The escalator shall start automatically
when required; activation shall be by photocells installed in the top and bottom landing areas.
4.5.5.3 Elevators (lift) in buildings of occupancy A5, D1, E1, E2, F1, F2, I1 and I3 occupancies shall be provided
with controls to reduce the energy demand, using the following features in traction drive elevators:
(a) AC Variable-Voltage and Variable-Frequency (VVVF) drives on non-hydraulic elevators.
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(b) An average lamp efficacy, across all fittings in the lift car, of >55 lamp lumens/circuit watt, with
provision for switching off, when lift is inactive for a period of a maximum of five (5) minutes.
(c) The provision to operate in stand-by condition during off-peak periods, when the lift has been inactive
for a period of a maximum of five (5) minutes.
4.5.6 Renewable Energy Options
4.5.6.1 Buildings of occupancy A shall use Solar or other renewable sources of energy to power 3% of the total
electric load of the building, applicable to the uses in Sec 4.5.6.3.
4.5.6.2 Buildings of all occupancies other than A, shall use Solar or other renewable sources of energy to power
5% of the lighting and fan loads of the entire building, mandatory to uses in Sec 4.5.6.3.
4.5.6.3 For all occupancies, the solar or other renewable energy connection shall power spaces in the following
order of priority: lighting in underground/basement spaces, dark corridors, supplementary lighting, fans,
emergency lighting like fire stairs, emergency signage’s, egress path lighting, etc.
4.5.7 Heating Ventilation and Air-conditioning (HVAC) System
For conditioned buildings any Heating Ventilation and Air conditioning (HVAC) system planned for installation
will meet energy efficiency standards specified in Part 8 of this Code.
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4.6 INTERNAL WATER MANAGEMENT
4.6.1 Reuse of Grey Water
Buildings of occupancy A5, E1 and E2 and I shall reuse grey water for water efficiency and management.
Grey water from wash basin shall be reused in toilet flushing and/or irrigation after filtration to ensure a BOD
(Biochemical Oxygen Demand) level <50. Such water shall not be considered potable.
4.6.2 Efficient Fittings in Toilets
Water efficient fittings, including faucets, showerheads and flushes, that use less water for the same function as
effectively as standard models, shall be used in buildings of all occupancies. The low flow fixtures shown in Table
3.4.7 shall be used.
Table 3.4.7: Fixture Ratings Quantity (max) Unit
Type of Fixtures Dual Flush (6/4) liters/flushing cycle (full/low)
Water closets
Shower 9.5 liters/min at 551 kPa
Urinals 3 liters/flushing cycle
Hand wash taps 6 liters/min at 417.7 kPa
Kitchen/pantry faucets 6 liters/min at 417.7 kPa
4.6.3 Service Hot Water and Pumping
In order to reduce the energy used for water heating, buildings of occupancy A5 and D1 shall use solar hot water
system to supply a minimum of thirty (30) percent of the total building hot water requirements. The solar hot
water system can be flat plate solar collectors or vacuum tube solar system, this system must be designed and
installed with the backup system or as a per heating for the main hot water system.
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Appendix A
Planning and Development Control
A.1 SCOPEBNBC 2015 FINAL DRAFT
In absence of planning and zoning code in the national level, this Appendix states certain planning guidelines for
development control and for environmental and human safety. The guidelines formulated in this Appendix are
suggestive.
A.2 LAND USE CLASSIFICATION
Land is a finite resource. An integrated and hierarchical planning from national to local level of this resource is
essential to identify and use its potential in compliance with the National Land Use Policy.
Every city, township, municipality or other settlements shall have planning and zoning regulations administered
by the authority having jurisdiction to guide the existing and future developments of that settlement in
compliance with the National Land Use Policy and with local or regional master planning. Any land-use planning
shall clearly classify the following uses:
(a) Permitted land use
(b) Conditionally permitted land-use and
(c) Restricted land use
Any such plan shall also include the preservation of open spaces and water bodies as part of the land use
planning.
A.3 GENERAL GUIDELINES FOR RESIDENTIAL DENSITY PLANNING
A.3.1 Control of residential density is a fundamental component of effective land use planning, as the relative
distribution of population has major implications for all other provisions. In determining Residential density, a
coherent view should be considered to achieve integrated land-use, transport, environmental and
infrastructural planning.
A.3.2 Along with this integrated approach, the following factors shall also guide the residential density:
(a) A hierarchy of residential densities should be maintained to ensure diversity of housing needs.
(b) Residential density of an area shall correspond to the capacity of existing and planned infrastructure
and environmental features of that area.
(c) Densities should be planned in such a way that encourage public transport and reduce travel demand.
(d) For large cities higher densities around stations and interchanges of rail based public transport system
may be encouraged to reduce reliance on road based public transport system.
(e) Since higher density residential development near high capacity transportation system creates pressure
on urban land use planning, careful environmental planning with definitive environmental objectives
shall be there for such instances.
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(f) To protect environmentally sensitive areas or areas of historical importance, a low density residential
development should be proposed where and as necessary.
(g) In heavily built up areas such as old towns, provision of Transfer of Development Rights (TDR) could be
implemented to control over-crowding.
A.3.3 The maximum allowable density of a residential development shall be guided by the Planning
Guidelines for a zone or area or locality or township which shall be prepared under and administered by the
authority having jurisdiction. Floor Area Ratio (FAR) for any development shall comply with any such planning
guidelines. Where such density guideline is not available, the maximum allowable density for a residential
development shall be 175 units per hectare.
A.4 GENERAL PLANNING GUIDELINES FOR OPEN SPACE REQUIREMENTS
In a high density context like ours, pressure on land is extreme. Preserving open spaces and maintaining
environmental balance become a priority in this context. In any planning process, open space must be planned
as a land use in its own right and not as the remainder after providing other land uses. The hierarchy of
Recreational open spaces in planning settlements may be as following:
(a) Local Open Space
(b) Ward Open Space
(c) Regional Open Space
Authorities having jurisdiction shall determine the extent of the terms ‘local’, ‘ward’ and ‘region’ on the basis of
governance structure and the master planning for any particular area. However, in developing any area layout
as specified in Sec A.5.2 of this Appendix, provisions for Local open space should be applicable. All open spaces
in this hierarchy should act as a connected component of an open space network. The following paragraphs
indicate few guidelines on location and space requirements for such open spaces.
A.4.1 Every locality should have Local Open Space which is required to meet primarily the passive recreational
needs (e.g. outdoor sitting, jogging/ walking tracks, playgrounds for children etc.) of the population. Such spaces
should be located either within the residential neighborhood or somewhere centrally to serve a wider area of
more than one neighborhood. Considering the projected future population of a locality, a minimum
requirement of 1 m² of Local open space per locality occupant should be allotted. Where possible such open
spaces should be at least 500 m².
A.4.2 Every ward in a city or town or union should have Ward Open Space which is required to meet the
active recreational needs (e.g. standard facilities for sports) and passive recreational needs of the ward
population. Considering the projected future population of a Ward, a minimum requirement of 1 m² Ward Open
Space per Ward occupant should be allotted. Where possible such open spaces should be at least 10,000 m² (1
hectare).
A.4.3 Every region should have Regional Open Space which is required to meet wider recreational needs of
the population that cannot be served by local or ward open spaces. In metropolitan areas, Ward Open Space
may supplement for 50 percent of the Regional Open Space requirement. Conscious planning effort are needed
to create/ designate and/ or preserve 'Regional Open Spaces' located close to major public transport routes,
taking advantage of natural landscape, waterfront, hill views, forest areas and/or views to special features that
may draw visitors from all around. Where possible such open spaces should be at least 50,000 m² (5 hectare).
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A.5 COMMUNITY OPEN SPACE AND AMENITIES
Every plot as specified in Sections A.5.1 and A.5.2 shall have community open space which is required to meet
primarily the passive recreational needs (e.g. outdoor sitting, jogging/walking tracks, playgrounds for children
etc.) of the population. Such spaces shall be located within the plot boundary. Considering the types of
development, the following minimum requirements of community open space and amenities shall be applicable
as per guideline of Sections A.5.1 and A.5.2 of this Appendix.
A.5.1 Community Space for a Single Tall Building or Group of Buildings In a Plot
For all residential or residential-cum-business buildings having ten or more storeys, or for all plots on which
more than one residential or residential-cum-business buildings are constructed, community built space at the
rate of 5 percent of the total floor area shall be provided within the building for use of the occupants of the
building solely. Roofs of such buildings shall not be considered as community open spaces.
For residential or residential-cum-business plots measuring more than 0.1 hectare, 10 percent of the area of
land or 1 m² per occupant of the plot, whichever is larger, shall be left vacant to be used as children's
playground. This playground shall be contiguous and shall have a length not exceeding 2.5 times its width. The
playground may extend into the mandatory open space of the plot.
Open space and amenities for residential or residential-cum-business plots measuring more than 0.4 hectare
shall be as per guidelines of Sec A.5.2 of this Chapter.
A.5.2 Community Open Space and Amenities in Area Layouts
(a) Residential or Business Areas
In dividing any land measuring a total of 0.4 hectares or more into residential or business plots,
community open spaces and amenities shall be reserved for recreational, educational, health care and
other purposes depending on the size of the population for which the layout is planned. For planning
such open spaces and amenities the guidelines of Sec A.4 of this Appendix and Sec B.3 of Appendix B
shall be applicable.
(b) Industrial Areas
In dividing any land measuring a total of 1 hectare or more into industrial plots, 5 percent of the total
land area shall be reserved as amenity open space which shall be used as lawn, park or garden. The
minimum size of such open space shall be 600 m². When the area of the open space exceeds 1000 m²,
the area of land in excess of 1000 m² can be used for the construction of buildings for banks, clinics,
welfare centers and other common facilities for use of the persons working in the industries.
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A.6 PLOT SIZE
Plot divisions and plot sizes are part of integrated planning decision of detail area plan and shall be determined
by the Area Development Authority having jurisdiction. Where no such guideline exists or yet to be undertaken,
the following criteria mentioned in Sections A.6.1 to A.6.8 regarding plot size shall be applicable.
A.6.1 Residential Plots
(a) For any future development the minimum size of the plot for Occupancy A1, A2 and A3 shall be 66 m²,
133 m² and 200 m² respectively.
The sizes of the plots and the corresponding minimum widths of road frontage of the plots shall be as
specified in Table 3.A.1 provided that:
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(i) Plots accessible by link roads shall be considered to have a frontage equal to the width of the link
road, and
(ii) Plots of irregular shape abutting the road shall be considered to have a frontage equal to their
average width parallel to the road.
(b) The limitations of plot sizes and frontages imposed in Sec A.6.1 (a) above may be waived for approved
affordable housing including site and service schemes. Guidelines governing the planning and design of
such housing given in Appendix B.
(c) The minimum size of the plot for a group housing development scheme and other special requirements
for group housing developments shall be as specified or approved by the respective city development
authority.
(d) For minimum standard transitional housing, government may allow smaller plots following the
guidelines mentioned in Appendix B.
Table 3.A.1: Minimum Frontage of Residential Plot
Type of Residential Plot Size (m2) Minimum
Development Frontage (m)
4.5
Approved row type housesBNBC 2015 FINAL DRAFT66 (Minimum size)
Semi-detached houses Over 66 to below 133 8
133 (Minimum size) 8
Over 133 to 200 8-10
Over 200 to 267 10-12
Detached Over 267 to 334 12
Over 267 to 334 12
Over 335 to 669 16
Over 669 24
Note: For plot sizes larger than 133 m2 detached house type may be allowed
provided that the site frontage is 12 m or more
A.6.2 Plots for Educational Buildings
The minimum size of plot for educational buildings shall be based on occupant capacity and shall be at the rate
of 4 m² per pupil or occupant. With exception for nursery school the minimum plot size required for educational
purpose shall be 3950 m² (see Appendix B).
A.6.3 Plots for Assembly Halls, Theatres, Cinema
The minimum size of plot for assembly halls, theatres, cinema halls and other similar buildings where people
gather for entertainment or other public functions shall be based on the seating capacity of the building and
shall be at the rate of 3 m² per seat. Table 3.A.2 shows the minimum plot size for such function:
Table 3.A.2: Plot Sizes for Assembly Occupancy
Sub-Category Nature of Use or Occupancy Minimum Plot Size
I1 Large assembly with fixed seats 3000 m2
I2 (1000 seats or more)
I3 Small assembly with fixed seats 3 m2 per seated person
I4 (less than 1000 seats)
I5 Large assembly without fixed seats 900 m2
(300 or more occupants)
Small assembly without fixed seats 3 m2 per seated person
(less than 300 seats)
Sports facilities Related to event and
spectator capacity
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A.6.4 Plots for Community Centers
The size of plot for rural or urban community centers shall be not less than 1300 m² and commensurate with the
size of the community.
A.6.5 Business and Mercantile Plots
The minimum size of a business and mercantile plot shall be 200 m² and its road frontage width shall not be less
than 10 m.
A.6.6 Industrial Plots
The minimum size of an industrial plot shall be 300 m² and its road frontage width shall not be less than 15 m.
A.6.7 Petrol Filling Stations
The minimum size of the plot for a petrol filling station without service bay or repair workshop shall be 500 m²
and its road frontage width shall not be less than 30 m. The minimum size of the plot for a petrol filling station
with service bay but without repair workshop shall be 1100 m² and its road frontage width shall not be less than
30 m.
A.6.8 Plots for Other Uses
The minimum sizes of plots for buildings for uses other than those mentioned in Sections A.6.1 to A.6.7 shall be
as determined by the Authority having jurisdiction.
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Appendix B
Guidelines for Minimum Standard Housing
Development
B.1 GENERALBNBC 2015 FINAL DRAFT
B.1.1 Government bodies or public agencies may designate an area in the master plan for the development of
Mass Housing Projects. Generally all such development shall be known as Minimum Standard Housing, which
shall be broadly categorized into the following two categories: a) Minimum Standard Community Housing and
b) Minimum Standard Transitional Housing. Requirements for master plan and dwelling units in such projects
shall have special provisions depending upon the category of development mentioned above.
The guidelines of this Appendix cover the planning and the general building requirements of all such Minimum
Standard Housing developments.
B.1.2 A minimum standard community housing is a housing that confirms to the basic minimum requirement
regarding dwelling units, community and other facilities according to the provision of this Code. Requirements
for community facilities in these housings shall depend upon the size and scale of the community (Sec B.4.2).
Dwelling units in all such developments shall be classified as Occupancy A1, A2, A3 or Mixed Occupancy
depending upon the type of development (Sec B.3) and degree of mixing with other occupancies within the
same structure.
B.1.3 Minimum Standard Transitional Housings are housing facilities on a transient basis before providing its
inhabitants with Minimum Standard Community Housing. Ensuring safety, health and sanitation requirements
shall be the primary obligation for such housing. Since, it may not be convenient or practicable for the planning
and dwelling units in such projects to be in full compliance with all the requirements of this Code, a few
exemptions have been made for all such housings in the following Sections of this Appendix. All Transitional
Housing, irrespective of its type of development (Sec B.2) shall be group housing. Dwelling units in a transitional
housing shall be classified as Occupancy A3, A4 or Mixed Occupancy depending upon the type of development
and degree of mixing with other occupancies within the same structure.
B.1.4 Only government bodies or public agencies should be responsible for planning the number and location
of the settlements in an approved master plan following the density guidelines of Appendix A and the layout of
units within the settlement. The guidelines of this Appendix regarding layout planning are applicable to
government bodies or public agencies responsible for such planning.
B.1.5 The guidelines and requirements regarding design and construction of buildings for minimum standard
housing in approved layouts are applicable to all government bodies, public agencies, private developers or
individual owners who undertake such constructions.
B.2 TYPES OF DEVELOPMENT
The development of minimum standard housing may be any one or a combination of the following types:
(a) Single unit plots of row type housing
(b) Multi-storied flats of row type housing
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(c) Block development as a group housing
(d) Cluster housing, and
(e) Site and service schemes
The guidelines for planning and general building requirements shall be applicable to all types of development of
minimum standard housing unless exempted as mentioned in this Appendix.
B.2.1 Single Unit Plots of Row Type Housing
Row Type in a housing development is characterized by independent plotted developments for single family
dwelling (A1) and shared community facilities. Along with single family detached and semi-detached dwelling,
this type of dwelling is used to achieve low-densities in a settlement.
This type of development should be located away from high capacity public transportation system and should
be characterized by high car ownership rate.
All such development shall comply with the provisions for parti-wall and general criteria for natural lighting and
ventilation as described in Part 3 Chapter 1, Part 6 and Appendix E.
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Figure 3.B.1 Row type development
B.2.2 Multi-Storied Flats of Row Type Housing
Unlike single unit plots of row type development multistoried flats of row type housing are not plotted
development. Here the un-demarcated un-divided land is shared by the flat owners within such complex.
Houses or flats or apartments in Multi-storied Row type developments shall share walls with adjacent flat or
apartment, provided that they are designed and built at the same period as part of the same project and also
that they fulfill the general criteria for natural lighting and ventilation as referred in Part 3, Chapter 1.
Multi-storied row type developments should be permitted for walkup apartments (A3) as well as two family
dwelling (A2) with many of the community facilities at lower levels. Such developments are good for medium
density settlements and may also be used in mixed use zones.
B.2.3 Block Development as a Group Housing
Block developments are characterized by high-density large scale developments within a block usually
surrounded by roads all around and serviced by high capacity transport and utility network.
Large plots of 4048 m² or more, with road access on one side may also be considered as block development if
provided with a peripheral access road along its perimeter and also if they are in close proximity to high capacity
transport and utility infrastructure network. All such plots may be allowed to attain higher densities than other
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typologies. Such developments are more desirable in the central urban areas emphasizing more dependency on
public transportation and less on private transportation. Parking requirements in such typologies shall be less
than other typologies.
Block development for Group Housing should be permitted for large scale developments of Apartments (A3) or
Mess, Boarding houses, Dormitories and Hostel (A4).
All such residential developments can be mixed with other permitted occupancies to encourage availability of all
services within the close proximity and to support growth of local economy. All such developments can be
subdivided into following two categories:
(a) Tower Block Development for Group Housing
This includes Flats or Apartments (A3) in a single or multiple high-rise towers within a block/large site with
relatively low ground coverage and higher density along with open spaces and community facilities within
and around the tower blocks.
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Figure 3.B.2 Tower block development
(b) Perimeter Block Development for Group Housing
Unlike Tower blocks, Perimeter block developments involves one single building or multiple buildings placed
along the perimeter of the site to create an internal open space shielded from its surrounding, commonly
used as community space. Each housing unit in such developments shall have at least two sides open- one
at the internal open space and the other at the external road side.
Depending upon the plot size and population such development may also be permitted to become high-rise
development, provided that the internal open space in such development confirms to the criteria for
minimum requirements of a courtyard (Part 3, Chapter 1).
B.2.4 Cluster Housing
Cluster type development, as a housing form, is suitable for accommodating low to high density of population
within walkup range. Cluster type development for Group Housing should be permitted for all ranges such as for
low density development for single family dwelling (A1) and two family dwelling (A2) or for moderate to high
density developments of Apartments (A3) or Mess, Boarding houses, Dormitories and Hostel (A4). Details of this
typology have been discussed in Appendix D.
B.2.5 Site and Service Schemes
Site and service schemes shall delineate individual plots and provide for the infrastructural needs for the
development of a permanent housing. Interim constructions by the allottees should also be permitted. Skeletal
structures with a roof on columns and/or developed plinths may be provided if funds are available.
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Sanitation and water supply must be provided in all site and service schemes. A sanitary service core or common
water supply and sanitation facilities for planned groups of plots should normally suffice. The developing agency
shall install the services before handing over the plots.
Site and service schemes for group housing should be permitted for low density development of single family
dwelling (A1) and two family dwelling (A2) and ownership right of such housing shall be non-transferrable.
Figure 3.B.3 Perimeter block development
BNBC 2015 FINAL DRAFT
Figure 3.B.4 Cluster type development
B.3 PLANNING
B.3.1 A minimum standard housing shall ensure quality living for all its inhabitants. Providing proper
environmental quality, social and utility infrastructure, educational facilities, health care and recreational
facilities, connectivity to commerce and job locations in a comprehensive planning are pre-conditions to attain
that. With increasing urban population and the shortage of developable land, high residential densities shall
occur. This multiplies the necessity for the provision of community facilities to ensure the minimum standard of
the housing.
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B.3.2 DensityBNBC 2015 FINAL DRAFT
Housing density for an area or locality or settlement is a planning issue and shall be decided by the planning
authority in accordance with the Detail Area Plan (DAP). Where such guidelines are unavailable, the gross
density of a minimum standard housing shall not be more than 175 units per hectare, considering an average
population of 5 persons per dwelling unit. The general distribution of built area and open space shall follow the
provisions of Sec B.3.3.
B.3.3 Basic Requirements for Community Facilities and Facilities for Locality
Any minimum standard housing, irrespective of its type of development, should be planned and organized in
groups or clusters, where each of the clusters should not exceed 400 dwelling units with an average population
of 5 residents per dwelling. Where the number of dwellings is more than that, more than one clusters, each
below 400 units, should be formed.
In any housing project, community and facilities for locality are essential. The facilities required for any such
project shall depend on the size of the community or communities within a locality. Table 3.B.1 and Table 3.B.2
show the requirements of such facilities for any housing development in reference to their variation of net
density and their relation to the threshold population.
B.3.3.1 Open space within a site area
Open space within a site area shall be as defined in Sec 1.8 Chapter 1, Part 3. However for a minimum standard
housing, such open space shall also be equal or more than the open to sky space which is an outcome of
addition of
(a) Mandatory setback area and
(b) Area requirement for Community Open Space (COS) as per Sec B.3.3.2.
For plots below 4048 m² community open space may overlap with mandatory setback area.
B.3.3.2 Community open space shall not be less than 1 m² per occupant.
B.3.3.3 Community facilities consist of two components:
(a) Community Open Space (COS): Community open space is an undivided contiguous open space within a plot
or block or cluster which along with mandatory setback area constitutes the open space of the site.
Depending upon the size of population and land area this space may be used as any or combination of the
following uses-
(i) Lawn
(ii) Garden
(iii) Play lot
All such uses shall be exclusive to the residents of that plot or block or cluster.
No paved area, other than the minimum required area for vehicular and pedestrian access to the site, is
allowed within this community open space. All such road and walkways shall ensure pedestrian priority and
safety and shall not be used as a through circulation.
The following guidelines shall be maintained if the area of the community open space within the site fulfills
the criteria mentioned in the first column of Table 3.B.1.
(b) Community Built Space (CBS): Community built space is part of the community facilities dedicated to serve
the population within a given site or block or cluster. Depending upon the threshold population, the CBS
shall include facilities as per guideline of Table 3.B.2 for a threshold population up to 200 families.
Table 3.B.1: Guideline for Minimum Width for Community Open Space
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Part 3
General Building Requirements, Control and Regulation
Open Space Area (m²) Minimum Width (m) May Accommodate
130 or more 9 Badminton, table tennis etc
700 or more 21 Basketball, badminton etc.
B.3.3.4 Facilities for Locality (FL): Facilities for localities are shared facilities consisting of both Local Open
Spaces (LOS) and Local Built Spaces (LBS) located outside the plot boundary but within the locality. The total
space requirement of the Facilities for locality shall vary considerably depending upon the requirements of net
density, gross density and threshold population of Table 3.B.2.
Table 3.B.2 refers to list of such facilities for a plot/locality/ward/region in relation to population size and space
requirement for a settlement.
Table 3.B.2: Threshold Population and Minimum Reference Standard of Facilities for Community and Locality
Facilities Threshold Population Minimum Level Served
to Start the Facilities Reference Standard
General* Plot
Community Open Space (COS) 3 families 1 m² per person Plot
10 families 10 m² room Plot
Management office 20 families 2 m²/ family
Meeting room/ hall Plot
(multi-purpose with storage and 30 families 1 m² per family Plot
washroom facilities) 40 families 0.75 m² per family
Indoor games room BNBC 2015 FINAL DRAFT
Prayer hall
Educational 100-300 families/ 500- Minimum 6 children Plot/ local
Day care center** 1500 persons Local
Minimum 6 Local
Nursery/ kindergarten school 400-600 families/ 2000- classrooms Ward
(age group 3 to under 6 3000 persons
years)** Minimum 3950 m² site Regional
1000-1600 families/ area with minimum
Primary school (age group 7 to 5000-8000 persons site width of 55m Plot/ local
under 11 years)** Plot/ local
1800-2400 families/ Minimum 6950 m² site Ward/ regional
Secondary school (age group 12 9000-12000 persons area with minimum Ward/ regional
to under 17 years) site width of 65m
10,000 families/ 2000 m²- 7000m² site Local
Colleges/ community colleges/ 50000 persons area Local
vocational colleges Local/ ward
Commercial 50 families 4 stores per 200 Ward
Small store/s families (20 m² per
200 families
Medicine store/ dispensary/ store, max)
convenience grocery store/ 2000 families/ 10,000 175 m² per 400
persons families minimum
bakery/ beauty parlor
Super-market 4000 families/ 20,000 400 m² per 300
persons families
Shopping center
300 families 175 m² per 400
Socio-Cultural families
Community welfare center 400 families
Plot size 1300 m²
Places for worship 1000 families minimum.
(Mosques, temples, churches
1000 families 175 m² minimum
etc.)
Community Hall
Library
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Guidelines for Minimum Standard Housing Development Appendix B
Facilities Threshold Population Minimum Level Served
to Start the Facilities Reference Standard Ward
Healthcare Ward
Health center 400 families/ 2000 175 m² per 400
persons families Local
Small clinic Ward
2000 families/ 10,000 Minimum 2200 m²
Services and Utilities persons plot per 10,000 Ward/ regional
Internal roads and walkways persons Local/ ward
Any
Amenities 15 to 20 per cent of
(Garbage disposal, water pump, Any the site area
local electrical substation/ 400 families/ 2000 5 per cent of the site
generator etc.) persons area
Office of local authority, As per planning 175 m² per 400
community police etc. guideline families
Public transport stoppage/
2000 families/ 10,000 At least 1 bus bay with
station*** persons passenger shed
Sports and Recreational
1000 families/ 5,000 1 hectare minimum
Park, water front persons per 10,000 persons
400 m² minimum
Play ground (local level) per 5000
persons
BNBC 2015 FINAL DRAFT
Children and youth center 2400 families/ 12,000 630 m² minimum per Local/ ward
persons 12000 persons
Gymnasium, Indoor games 1000 families/ 5000 175 m² minimum per Local/ ward
persons 5000 persons
Swimming pool 6000 families/ 30,000 420 m² of water Ward
persons surface/ 30,000
persons
Sports Complex with indoor and 10,000families/ 50,000 0.6 hectare Ward
outdoor facilities persons (ward level) per 50000
persons
* All general facilities shall be accommodated within the plot or block or cluster area. For any housing having
a population of 10 families or above, the total built area (excluding community open space) dedicated to such
facility/ facilities (depending upon the population size) shall not be less than 1m² per person.
** All such facilities must be a part of integrated planning prioritizing close proximity to the housing units
they serve. The distance of such facilities from the serving units should not be more than 0.4 kilometers, All
such connecting pathways, street etc. shall be away from major roads and shall have pedestrian priority.
*** Public transport stoppages should be located nearer to health facilities, post-secondary educational
institutions and other public buildings and should be supported by public parking facilities nearby.
B.3.4 Size of Plot
B.3.4.1 Minimum standard community housing
All minimum standard community housing shall follow the general guidelines of plot sizes mentioned in
Appendix A.
B.3.4.2 Minimum standard transitional housing
All types of minimum standard transitional housing, except site and service type, shall be group housing (A3 or
A4 occupancy) and shall abide by the plot size requirement of Appendix A. For Site and Service transitional
housing, the authority may allow higher density for larger plot size with close proximity to public transport
network provided that such decisions are in compliance with the planning guidelines for the area or locality.
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Part 3 BNBC 2015 FINAL DRAFT
General Building Requirements, Control and Regulation
Site and Service Scheme for Single Room Development: For site and service transitional housing development
where a minimum standard house with single room, kitchen, bathing facilities and water closet is expected to
develop, the minimum plot size may be reduced to 30 m2 with a minimum frontage of 4.1 m. In areas other than
metropolitan cities; with population less than 0.5 million, the minimum size of plot for such houses should be 40
m2 with a plot frontage of minimum 4.8 m. In dense inner city areas of metropolitan cities with population more
than 1.5 million, the Government may decide to have a minimum plot size of 25 m2 with a minimum frontage of
4.1 m for such housing.
Site and Service Scheme for Two Room Development: For site and service transitional housing development
where a minimum standard house with two rooms, kitchen, bathing facility and water closet is expected to
develop, a minimum plot size of 40 m2 shall be required. In areas other than metropolitan cities, having a
population less than 0.5 million, the minimum size of the plot for such houses should be 60 m2.
B.3.5 Internal Roads and Walkways
Pedestrian walkways when provided as means of access shall be at least 3 m wide. Such walkways shall not be
longer than 60 m, nor serve more than 10 plots on each side of the path. Other internal roads shall be at least 6
m wide to allow emergency vehicles to enter. The paved portion of such roads, if used for pedestrian movement
only, should be at least 2 m wide.
B.4 GENERAL BUILDING REQUIREMENTS
B.4.1 Plinth Coverage
The plinth area coverage of any plot of minimum standard housing shall not exceed 65 percent of the plot area.
Plots with higher net density shall have lower plinth area and ground coverage.
Exception: For minimum standard transitional housing
The plinth area coverage of any plot of transitional housing shall not exceed 75 percent of the plot area. There
shall be a setback of minimum 1.5 m on the rear side of a plot. There is no requirement for such set back on the
sides and front of a plot if facing an internal road.
B.4.2 Height Limitation
The height limitation in such housing will vary according to typology of each development. However, maximum
height for minimum standard housing for site and service scheme shall be 10 m. Minimum standard transitional
housing of cluster type development and multistoried Row type development shall have a height limitation of
maximum 20 m or 6 storied.
B.4.3 Plinth Level
The minimum height of the plinth shall be 300 mm from the surrounding ground level.
B.4.4 Habitable Room
B.4.4.1 All dimension stated in this Section do not include area or dimension required for partition or enclosure
wall. Criteria for habitable room shall follow the basic guidelines of Part 3 Chapter 1.
B.4.4.2 Overcrowding
To avoid overcrowding in all habitable rooms in minimum standard housing including transitional housing, a
minimum air volume of 9.5 m³ (9.5 cubic meters) per occupant shall be allotted. To calculate such volume no
account shall be taken of any space with a height higher than 4.25 m or less than 2.15 m from the floor level of
the room.
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Exception: For transitional housingBNBC 2015 FINAL DRAFT
(a) In a flatted development, one roomed dwelling units shall have a multi-purpose room which may include an
alcove or space for cooking (as specified in Sec B.4.5). The minimum area of the room shall be 12 m² with a
minimum width of 2.5 m.
(b) For dwelling units with two habitable rooms the minimum size of at least one room shall be 9.5 m² with a
minimum width of 2.5 m. Other habitable room in the dwelling unit shall have a minimum area of 5 m² with
a minimum width of 2 m.
(c) One-roomed dwelling with plan for future extension into a two-roomed house in a staged construction
scheme shall satisfy the requirement of (a) and (b) above regarding room sizes. The first room to be built in
this type of development shall have a minimum area of 9.5 m² with a minimum width of 2.5 m. The total
area of the two rooms after future extension shall be a minimum of 15 m².
(d) All habitable rooms shall have a minimum clear height of 2.75 m. For sloped roofs the average height shall
not be less than 2.75 m with a minimum of 2 m at the lowest side.
B.4.5 Kitchen
B.4.5.1 Criteria for kitchen shall follow the basic guidelines of Part 3 Chapter 1.
B.4.5.2 Exception: For minimum standard transitional housing
(a) The size of the cooking alcove or cooking space provided in a multi-purpose room of a one-roomed house
shall not be less than 2.25 m² with a minimum width of 1.2 m.
(b) Separate kitchen provided in a two-roomed house shall have a minimum area of 3.25 m² with a minimum
width of 1.6 m.
(c) Minimum clear height of the kitchen or cooking space shall be 2.15 m.
B.4.6 Bathroom and Water Closet
B.4.6.1 Independent water closets shall have a minimum width of 0.9 m and a minimum length of 1.15 m. The
water closet shall be fitted with a door.
B.4.6.2 Independent bathroom without water closet shall have a minimum width of 1 m and a minimum length
of 1.4 m.
B.4.6.3 The minimum size of a combined bathroom and water closet shall be 1.8 m² with a minimum width of
1 m. The bathroom shall be fitted with a door.
B.4.6.4 The minimum clear height of bathrooms and water closets shall be 2.15 m.
B.4.7 Balcony and Corridor
B.4.7.1 The minimum width of individual balcony shall be 0.9 m. Corridors for use of more than one dwelling
units shall have a minimum width of 1.2 m.
B.4.8 Stairs
B.4.8.1 Minimum Width: Criteria for minimum width of stairs shall follow basic guidelines of Chapter 1 Part 3.
B.4.8.2 Maximum Rise: Criteria for maximum riser shall follow the basic guidelines of Chapter 1 Part 3.
B.4.8.3 Minimum Tread Depth: Criteria for minimum tread depth shall follow the basic guidelines of Chapter 1
Part 3.
B.4.8.4 Minimum Head Room: Criteria for minimum clearance of head room shall follow the basic guidelines of
Chapter 1 Part 3.
B.4.8.5 Landing: Criteria for minimum landing depth shall follow the basic guidelines of Chapter 1 Part 3.
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B.4.9 Water Supply
One water tap or hand tube-well pump per dwelling unit should be provided, if feasible. Each unit of public
water hydrants or community hand pumps, if provided in lieu of individual water supply, shall serve not more
than 10 dwelling units and shall not be farther than 15 m from any dwelling unit served.
B.4.10 Lighting and Ventilation
Every room, bathroom and kitchen shall have windows in an external wall opening on a courtyard, a balcony not
wider than 2.5 m, or the exterior. The aggregate area of openings in the exterior wall of a habitable room or
kitchen shall not be less than 12 percent of the floor area and that for a non-habitable room such as bath room,
water closet or stair shall be at least 8 percent of the floor area.
BNBC 2015 FINAL DRAFT
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Appendix C
Special Requirements of Cluster Planning for
Housing
C.1 GENERAL
These guidelines cover the planning and general building requirements of different housing developments in
cluster typologies as referred in Appendix B. These requirements are applicable to all housing projects of this
type taken up by public, private or co-operative agencies.
All cluster housing typologies shall fulfill the criteria regarding minimum area and width requirement of each
habitable and non-habitable room as specified by this Code. The construction classification for Cluster Housing
shall be of protected type.
C.2 CLUSTER TYPOLOGY
C.2.1 Cluster Type Development
Cluster type development (Figure 3.C.1), as a housing form, is suitable for accommodating low to moderate
density of population. However with smaller plot size, it can also attain high density situation as may happen for
Transitional Housing.
BNBC 2015 FINAL DRAFT
Figure 3.C.1 Cluster type Housing 3-121
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C.2.2 Examples of Cluster Typologies
(a) Back-to-Back Cluster — Clusters when joined back to back and/or on sides (Figure 3.C.2).
(b) Closed Clusters - Clusters with only one common entry into cluster open space (Figure 3.C.3).
(c) ‘Cul-de-sac’ Cluster - Plots/dwelling units when located along a pedestrianised or vehicular ‘cul-de-sac’
road (Figure 3.C.4).
Figure 3.C.2 Back to back cluster
Figure 3.C.3 Closed cluster
BNBC 2015 FINAL DRAFT
Figure 3.C.4 Cul-de-sac cluster
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Special Requirements of Cluster Planning for Houses Appendix C
C.2.3 Plot SizeBNBC 2015 FINAL DRAFT
In an integrated cluster planning, the minimum plot size shall comply with the guidelines set in Appendix B
(including transitional housing).
C.2.4 Community Facilities
All such housing shall be provided with the requirement of neighbourhood and community facilities required for
the population. In such cases, the authority may allow a FAR of 2.00 with 100 percent ground coverage provided
that the basic natural lighting and ventilation criteria is met through the two exterior sides, both having
exposure to the adjacent neighbourhood spaces.
C.2.5 Group Housing
Group housing may be permitted in the form of cluster housing. However, dwelling units with plinth areas up to
20 m² should have scope for adding a habitable room. Group housing in a cluster should not be more than 15 m
in height.
C.2.6 Size of Cluster
In single to two-storeyed structures not more than 20 houses should be grouped in a cluster. Clusters with more
dwelling units may create problem relating to identity, encroachment and maintenance.
C.2.7 Size of Cluster Open Space
Minimum dimensions of width of open spaces shall be not less than 6 m or 3/4th of the height of buildings along
the cluster open space, whichever is higher. The area of such cluster court shall not be less than 36 m². Group
housing around a cluster open space should not be more than 15 m in height.
C.2.8 Setbacks
In any cluster type development at least two sides of each individual dwelling shall have exterior walls and
opening. No setback is required in other two sides of such developments. However for compliance of natural
lighting and ventilation with this code, light well and ventilation well may be used within a cluster plot.
C.2.9 Right to Build in Sky
Pedestrian paths and vehicular access roads to clusters separating two adjacent clusters may be bridged to
provide additional dwelling units. While bridging the pedestrian path way minimum clearance should be one
storey height; length of such bridging should be not more than two dwelling units. While bridging the vehicular
access roads minimum clearance from ground level shall be 6 m with a vertical clearance of 5 m.
C.2.10 Vehicular Access
A right of way of at least 6 m width with a vertical clearance of 5 m shall be provided up to the entrance to the
cluster to facilitate emergency vehicle movement up to cluster.
C.2.11 Pedestrian Paths
Minimum width of pedestrian paths shall be 3 m.
C.2.12 Width of Access between Two Clusters
Built area of dwelling unit within cluster shall have no setbacks from the path or road, space. Hence, the height
of the building along the pathway or roads shall be not less than 60 percent of the height of the adjacent
building subject to minimum of 3 m in case of pathway and 6 m in case of vehicular access.
C.2.13 Density
Transitional housing shall result in higher densities with low rise structures.
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Part 3
General Building Requirements, Control and Regulation
For a minimum standard housing with one habitable room, one kitchen and one two-fixture toilet and the
required enclosure walls as per provision of this Code, a minimum dwelling unit of 23.81 m² is required.
However for transitional housing, the size of dwelling units may be reduced up to 18.5 m² to increases density.
In all such transitional housing a maximum allowable density shall follow the density guidelines of Appendix B.
C.2.14 Group Toilet for Transitional Housing
Transitional housing may have group toilets at the rate of one water closet, one bath and a washing place in
three separate chambers per three families. These shall not be community toilets, as keys to these toilets shall
be only with these three families, making them solely responsible for the maintenance and upkeep of these
toilets.
C.3 OTHER REQUIREMENTS
C.3.1 Requirements of Building Design
With the exception of clauses mentioned above, requirements of building will be governed by the provision of
this Code and good practice. Requirements of fire safety, structural design, building services and plumbing
services shall be as specified in this Code.
BNBC 2015 FINAL DRAFT
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Appendix D
Universal Accessibility
D.1 SCOPE
The aim of this Appendix is to set out the fundamental design and construction requirements and guidelines for
different occupancy types, accessible to persons with permanent or temporary disabilities. The requirements
and guidelines should be applicable for all buildings and facilities as shown in Table 3.D.1 for emergency
evacuation provisions of Part 4 shall be applicable.
D.2 TERMINOLOGIES
BNBC 2015 FINAL DRAFT
D.2.1 Definitions
For the purpose of this Part of the Code, the definitions/terminologies below shall be applicable:
ACCESSIBLE/ ADAPTABLE Refers to a compartment with a water closet, wash basin, grab bars and other
WASHROOM essential washroom accessories and with clear floor spaces at fixtures as per
provision of this Code which a wheel chair user or any other person with
ACCESSIBLE/ ADAPTABLE disability can avail with ease and safety.
WATER CLOSET
COMPARTMENT Refers to a compartment with adequate maneuvering space as per provision of
ACCESSIBILITY this Code having a single water closet with grab bars installed to assist persons
ACCESSIBLE RAMP with disabilities.
ACCESSIBILITY ROUTE
ADAPTABLE See Part 3 Chapter 1 definition.
AMBULANT DISABLED
See Part 3 Chapter 1 definition.
CIRCULATION PATH
CURB See Part 3 Chapter 1 definition.
CURB RAMP See Part 3 Chapter 1 definition.
GRAB BAR Refers to any person who, with the help of prostheses (artificial limbs)/ orthotic/
crutches/canes/ sticks or any other walking aid, is able to walk on level plain or
HANDRAIL AND GUARDS suitably graded steps with handrails complying the provision of this Code.
OPERABLE PART
See ‘accessibility route’
Refers to a side barrier between a trafficable surface and adjacent area through
level change.
Refers to a short ramp cutting through a curb or built on it to negotiate
accessibility between levels, which may have a different gradient as per
provisions of this Code than a conventional accessible ramp.
Refers to a bar of certain specification and height as per provision of this Code
which is used for assisting to stabilize a person with disability for performing a
particular function.
See Part 4 Chapter 3.
Refers to part or component of any equipment, appliance or fixture which is
necessary to operate that equipment, appliance or fixture (for example, handle,
lever, push-button etc.).
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PERSONS WITH Refer to persons whose mobility and capacity to use a building or part there of or
DISABILITIES a facility are affected due to one or more physical and/or sensory disabilities or
impairments. For the purpose of this Code, they will be categorized as following:
SYMBOL (a) Wheelchair-bound
WHEELCHAIR USER (b) Ambulant disabled
(c) Hearing impaired and
(d) Visually impaired.
Refers to the international symbol of access for persons with disabilities also
known as International wheel-chair symbol.
Refers to a person with disability who is depended on a wheelchair for mobility.
D.3 PROVISIONS FOR ACCESSIBILITY
D.3.1 Barrier-Free Accessibility
The following building occupancies shall require barrier free accessibility for persons with disability in the areas
or facilities as specified in Table 3.D.1.
BNBC 2015 FINAL DRAFT
Table 3.D.1: Requirements of Accessibility for Different Occupancies
Occupancy Type Accessible Areas
Residential buildings A3*, A5, From public footpath and parking areas to the lift lobby, lift, from
MIXED lift lobby to all housing units, at least one toilet per housing unit
and all communal facilities
Hostels and dormitories A4, MIXED All public areas intended for access by staff, students or visitors
and at least one room per every hundred rooms or portion
thereof including access to public footpath and parking.
Schools, colleges, universities or other B1-B3, MIXED All areas intended for access by staff, students or public use
educational buildings including access to public footpath and parking.
Hospitals, clinics, homes for the aged and D1, D2, C3 All areas intended for access by staff, patients, inmates or public
Institutions for the physically challenged use.
Office buildings E1, E3, MIXED All areas intended for access by employees or public including
parking and at least one accessible toilet facility in each floor
Small shops and markets, Kitchen markets F1, F3, MIXED From parking and/or public footpath to sales counter service
Large shops and markets F2, MIXED All areas intended for access by employees or public including
access to public footpath and parking.
Factories, workshops, industrial buildings G1, G2 All areas intended for access by employees or public use.
and administration buildings in depots
Religious buildings, crematoria I1-I4, MIXED All areas intended for access by worshippers or public including
access to public footpath and parking.
Restaurants, food-courts, fast food outlets I1-I4, MIXED All areas intended for access by employees or public including
and other public eating outlets access to public footpath and parking.
Cinemas, theatres, stadia or other places I1-15, MIXED All areas intended for access by performers and areas prescribed
of assembly with permanent seating by this Code for spectators or public use (Sections D.3.2.3 and
D.3.2.5) including access to public footpath and parking.
Sports complexes, public gymnasiums and I5 All areas intended for public access with at least one accessible
public swimming pools shower compartment and one water closet compartment.
Stations, airports, river-ports, bus MIXED All areas intended for access by employees or public use including
terminals, interchanges and other areas prescribed in Sec D.3.2.7.
passenger transport terminal
Parking garage, private garage, repair K1-K3 Prescribed areas in accordance to Sections D.24 and D.25.
garage and showrooms
Note:*Excluding apartments without lift
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D.3.2 Minimum Accessible ProvisionsBNBC 2015 FINAL DRAFT
D.3.2.1 Mess, dormitories and hostels
In residential occupancies such as mess, dormitories and hostels, at least one room in every 100 rooms or part
thereof shall be accessible.
D.3.2.2 Hotels and lodging houses
In room based residential occupancies e.g. Hotels, lodging houses etc. at least one in every 200 guest-rooms or a
portion thereof shall be made accessible.
D.3.2.3 Banks, ticketing offices and counter services
Public facilities with counter services, such as, banks, information desk, ticketing offices etc. at least one service
counter shall be designated in accordance to the requirements of Sec D.13.
D.3.2.4 Large shops and markets, foyers and public concourses
In large shops and markets such as large departmental stores, shopping mall etc. seats shall be provided for
persons with disabilities who are unable to stand or walk for long periods. There shall be at least one accessible
toilet per floor connected to the accessible route within such facilities. Seats and free spaces for wheelchair
users shall also be required in foyers and concourses of public buildings.
D.3.2.5 Movie theatres, theatres, stadiums or other places of fixed-seat assemblies
Assemblies with permanent fixed seats such as movie-theatres, theatres, stadium, indoor stadium etc. shall
have one wheelchair space per every 150 seats or a portion thereof. Such spaces should be located at a level
that is easy to access for the wheelchair users. Seat arrangements shall facilitate wheelchair users to sit with
their able bodied companion together. All such assemblies shall facilitate accessible counter facilities and toilets
for persons with disability within the accessible route.
D.3.2.6 Eating outlets
Eating outlets with fixed seats such as fast food shops, food courts etc. shall have one accessible wheelchair
seating per 10 seats or portion thereof. Seat arrangements shall facilitate wheelchair users to sit with their able
bodied companion together.
D.3.2.7 Public transport terminals, bus stops, railway stations
All public transport terminals including bus stops and railway stations shall be accessible to persons with
disabilities. The waiting areas of all such facilities shall be provided with seats for such persons who are unable
to stand for long periods. Aisles for movement in such spaces shall be not less than 1200 mm.
Necessary signs and symbols shall denote the accessible routes and facilities within or outside all such buildings
or facilities where ‘Tactile indicators’ shall guide the passengers form public footpath and accessible parking
areas to specific ticket counter, waiting areas, toilets and other service facilities, arrival and departure platforms
and to exits.
Doors of all public transports shall be accessible universally. Minimum clearance of all such doors shall be 900
mm. All such public transport should have at least two designated seats per coach near the door reserved for
people with disability. A stall for a wheel chair per coach near the door should also be designated with provision
for wheel stop blocks, safety bar with safety straps and adequate signage.
In all public railway carriages with toilet or dining facilities, the aisle width within the carriage should be at least
1200 mm.
It is preferable that there should be no level change between the platform level and the deck of the transport in
use. However, where such level differences occur, ramp or lift facilities should be available to ensure universal
accessibility.
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D.4 MINIMUM SPACE ALLOWANCES
D.4.1 Minimum Space Requirement for Wheel Chair Users
Depending upon the nearest obstruction and the direction of movement a wheelchair user shall be considered
for two approaches and shall require a minimum of 900 mm x 1200 mm unobstructed floor area as shown in
Figure 3.D.1.
To facilitate both parallel and forward approaches for wheelchair users, a minimum clear floor space of 1200
mm x 1200 mm, as shown in Figure 3.D.2.
The minimum clear turning space for a manually operated wheel chair shall be 1500 mm x 1500 mm. For a
powered wheel chair the requirement of turning space shall be 2250 mm x 2250 mm.
Where two wheelchairs are required to cross side by side, a minimum accessible clear width of 1800 mm shall
be provided. The minimum width of an accessible route shall be 1200 mm, as shown in Figure 3.D.3.
D.4.2 Projection, Protrusion and Obstacles in an Accessible Route
All along the pedestrian areas accessible to persons with disabilities (e.g. walkways, halls, corridors,
passageways etc.) any kind of obstacle, projection or protrusion shall be avoided. For all such areas an obstacle
or projection or protrusion of 100 mm or less from side walls within the circulation space may be exempted.
When such protrusion is more than 100 mm, the bottom edge of the protruding object shall not be more than
580 mm above the floor level, as illustrated in Figure 3.D.4. Such projections or protrusions shall not reduce the
clear width required for an accessible route or maneuvering space; to provide such protruding objects, space
shall be provided to accommodate those objects in addition to the required clear width.
The minimum clearance for headroom in all accessible areas such as walkways, halls, corridors, passageways or
aisles shall be 2000 mm. Any free standing post or object on or beside an accessible route shall follow the
guidelines of Figure 3.D.5.
Figure 3.D.1 Minimum clear floor space
Figure 3.D.2 Minimum clear floor space (both frontal parallel approach)
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Figure 3.D.3 Minimum width of accessible routes
D.5 SURFACE QUALITY OF FLOOR SPACE
D.5.1 General
All pavement or floor surfaces required to be accessible shall be firm, even, slip-resistant and stable. Any change
of level of such surfaces shall be negotiated in compliance with Sec D.5.2 or through accessible lifts as per
provision of this Code. To assist persons with visual impairment, such floors or their skirting shall have finishes
of contrasting color with adjacent walls.
D.5.2 Change in Level
Any change of level in an accessible route shall generally have gradient of at least 1 vertical to 12 horizontal
towards the direction of travel. All such slopes shall have special markings with contrasting colors at the top and
the bottom of the ramp or on the ramp slope as shown in Figure 3.D.6.
However, for change of vertical level up to 150 mm within any accessible route a steeper slope may be allowed
in accordance to Table 3.D.2.
Since for some ambulant disabled persons, steps are convenient and safer to use than ramps, accessibility
provision by both ramps and steps should be given.
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Figure 3.D.4 Limit of protruding objects 3-129
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D.5.3 Gratings
For safety of people with disabilities, the elevation of gratings located on an accessible route shall be at the
same level and aligned perpendicular to the direction of travel. The gap of such gratings shall not be more than
12 mm at any direction.
D.5.4 Surface Texture
In an accessible route, apart from the general requirement of Sec D.5.1, floor surfaces with tactile indicators
shall be required. In such cases dot type surface texture on floor shall indicate a warning, while line type surface
texture on floor shall indicate the intended path of travel.
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Figure 3.D.5 Limit for free-standing objects mounted on post
Figure 3.D.6 Markings on an internal ramp
Table 3.D.2: Gradient for Changes in Levels
Maximum Vertical Maximum Allowable Maximum Slope Ratio
Change of Level (mm) Length (mm)
1 vertical to 8 horizontal
0 to 75 600 1 vertical to 10 horizontal
1 vertical to 12 horizontal
more than 75 to 150 1500
More than 150 9000
D.6 APPROACHES
D.6.1 Public Access Ways
The minimum unobstructed width of an accessible public access way such as footpath, corridor, foot over
bridge, under pass etc. shall be 1200 mm. All such ways shall have a 1500 mm x 1500 mm space per every 30 m
of length to facilitate crossing or turning of users. However for pathways with width of 1500 mm or more no
additional width shall be required. The minimum access width shall not be encroached by obstruction or
protrusion of any kind and shall comply with provisions of Sec D.4.2.
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D.6.2 Vehicular Approach to BuildingBNBC 2015 FINAL DRAFT
To facilitate persons with disability approaching by vehicles the driveway, walkway and accessible parking
surfaces within a site shall either be merged to a common level or be connected by ramp (Sec D.5.2 and Table
3.D.2).
For occupancies mentioned in Sec D.3.2, at least one accessible route leading to an accessible entrance of the
building shall be provided from the descending and boarding point of vehicle parking lots for persons with
disabilities.
D.6.3 Access to Building
All accessible buildings or facilities as specified in Sec D.3 shall have at least one accessible entrance door,
located preferably with the main entrance and connected to an accessible route which shall be minimum 1200
mm wide. All accessible entrance doors shall comply with the provisions of Sec D.8.
D.6.3.1 Directional signs
To direct persons with disabilities to the accessible entrance/directional signs bearing the symbol shall be
displayed at all other non-accessible entrances and accessible parking areas.
D.7 ACCESSIBLE ROUTES, CORRIDORS OR PATHS
D.7.1 Length Width and Height
Any accessible route should not be more than 30 m of length at a stretch. Where such routes exceed this limit,
provisions of seating preferably with shading shall be required to reduce strain of persons with disability. The
minimum width of all accessible routes shall comply with the provisions of Sections D.4 and D.6.1. Where one
way accessible check-in or check-out lanes are provided, the minimum width shall be 900 mm. The minimum
height or headroom clearance for any accessible route shall be 2000 mm all along its path of travel.
D.7.2 Surface Finishes
All surfaces, edges, ends and corners of surrounding building and finish materials along an accessible route shall
be free from sharp edges and shall comply with provisions of Sec D.5.
D.7.3 Obstruction or Protrusion on Accessible Route
An accessible route shall be free from any kind of obstruction or protrusion. The minimum circulation space
required for persons with disability in such route shall not be impeded or obstructed by projection or protrusion
from side walls, overhead planes or from floor below.
If incase vertical obstacles such as posts, bollards etc. are inevitable on or beside an accessible route there shall
be at least 900 mm clearance between them to allow through circulation. Overhead obstacles such as drop
beam, signboards, canopies etc. shall have a minimum clearance of 2000 mm from the floor level of the
accessible route. All possible obstacles shall have color contrast with their background to ensure clear visibility.
Protrusion from side walls on or beside an accessible route shall follow the guidelines of Sections D.4.1 and
D.4.2. Projections or protrusions shall not reduce the clear width requirement for an accessible route; when
such protruding objects shall be there, space shall be provided to accommodate those objects in addition to the
required clear width.
D.7.4 Warning for Overhead Hazard
The minimum clear headroom in all accessible areas shall comply with Sec D.4. Whenever the headroom of an
area adjoining an accessible route is less than 2000 mm, a detectable guardrail having its detectable edge at or
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below 580 mm from the floor level shall be provided as shown in Figure 3.D.7 to warn persons with visual
impairment.
D.7.5 Physical Cue and Tactile Guidance
All accessible routes shall have provisions for physical cues and tactile guidance for persons with disability as per
provisions of Sections D.5.4 and D.29.
D.8 ACCESSIBLE DOORS
D.8.1 General
An accessible doorway shall ensure the access of all people with specific provisions for unassisted wheelchair
users safely and without inconvenience. For occupancies mentioned in Sec D.3.1, if revolving doors or turnstiles
are required an ancillary swing door with a clear opening of minimum 900 mm shall be required to ensure
accessibility.
The door threshold should preferably be at the same level with the floor. However if absolutely necessary, the
allowed level change shall be maximum 20 mm from the floor level and shall be sloped to allow wheelchair
access. All accessible bathroom and toilet doors should swing outwards to facilitate external emergency
assistance. Accessible door shall have color contrast with its adjacent walls.
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Figure 3.D.7 Protection from overhead hazard
D.8.2 Width of Accessible Door
A single leaf of any accessible doorway shall be 900 mm minimum measured between the face of the door leaf
open at 90° and the face of the opposite jamb as illustrated in Figure 3.D.8. Where doorways have double-leaf
at least one operable leaf shall allow 900 mm clearance to ensure accessibility.
D.8.3 Unobstructed Spaces for Operating Doors
All accessible swing doors shall have unobstructed spaces for wheelchair users on both side of the door leaf. In
such cases the side, in which the door leaf swings open, shall be known as pull side while the opposite as push
side. The requirement of unobstructed spaces in both the sides shall be in compliance with Figure 3.D.9.
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Where two-way swing doors are used in an accessible route, both side shall be considered as pull sides and a
vision panel complying with provisions of Sec D.8.5 shall be provided.
D.8.4 Door Operating Hardware
If not automatic, all accessories required for operating an accessible door such as door handles, fasteners, locks
etc. shall be manually operable by one hand with ease. The height of all such accessories shall be within the
range of 900 mm to 1100 mm from the floor level. Door handles are recommended over door knobs as knobs
may be harder to operate for persons with grip difficulties, Figure 3.D.10.
D.8.5 Vision Panels
For the safety of ambulant disables or wheelchair users, all two-way swing doors across any accessible route
shall have transparent vision panels as shown in Figure 3.D.11; where the bottom edge of such panels shall not
be higher than 800 mm while the top edge of the panel shall not be less than 1500 mm, both measured from
the floor level. The width of the viewing panel shall be not less than 150 mm. Such panels shall always be
located at the opposite end of the hinged end on a door leaf.
D.8.6 Turnstiles
Whenever a turnstile is placed on an accessible route, an accessible gate with a clear width of at least 900 mm
should be provided beside a turnstile, Figure 3.D.12.
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Figure 3.D.8 Clear width of accessible door
Figure 3.D.9 Minimum unobstructed space at doorway 3-133
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Figure 3.D.10 Preference of door handles
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Figure 3.D.11 Dimensions and location of vision panel
Figure 3.D.12 Access provision for turnstiles
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D.9 HANDRAILS AND GRAB BARS
D.9.1 General
Handrails and grab bars are very important safety features for any accessible facility. Therefore all such rails and
bars shall be of accurate size and shape, slip-resistant, free of sharp or abrasive finishes and shall firmly hold
with the supporting walls or floors or other form of supports. All such handrails shall have continuous gripping
surfaces at a constant height throughout their length so that persons with disability do not lose balance due to
loss of grip. There shall not be any sharp edges or corners in a handrail and a grab bar that may pose risk of
injury. Handrail and grab bars should have color contrast with the background. Such handrails and grab bars
shall not encroach on the minimum clear space for circulation.
D.9.2 Specific Requirements for Handrails and Grab Bars
All handrails in any accessible facility shall have a circular section of 35 mm to 50 mm external diameter or an
equivalent gripping surface of any other section. The clearance between such hand rails and its adjacent wall
shall be between 40 mm to 60 mm as shown in Figure 3.D.13.
Any recess containing a handrail shall have at least 450 mm clearance above the top of the rail as shown in
Figure 3.D.13. Height of such handrails shall be within a range of 850 mm to 950 mm measured from the floor or
in case of a stair from the nosing.
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Figure 3.D.13 Handrails
D.9.3 Structural Strength
All hand rails and grab bars in an accessible facility shall be designed and built to resist a force of at least 1.3
kN applied vertically or horizontally.
D.10 CURB RAMPS
D.10.1 General
Curb ramps in an accessible route should be kept within the pedestrian part of the circulation route and should
not protrude within the vehicular area. If such protrusion is unavoidable, the curb ramps should be constructed
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with flared sides with gradient specified in Sec D.10.2. Such ramps do not require handrails as long as the level
change is not greater than 150 mm.
D.10.2 Gradient, Width and Surface of Curb ramp
The gradient of a curb ramp shall follow the provisions of Table 3.D.2. The width of a curb ramp shall not be less
than 900 mm. Where the vertical change of level is greater than 150 mm or the horizontal run is more than
1500 mm, it shall constitute an accessible ramp and shall conform to the requirements of Sec D.11. All surfaces
of curb ramps shall be slip-resistant and shall have a detectable warning surface of contrasting color and texture
complying with provisions of Sec D.29 for visually impaired persons. Curb ramps with flared sides shall not be
steeper than 1:10 and shall follow the specifications shown in Figure 3.D.14.
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Figure 3.D.14 Curb ramp with flared sides
D.10.3 Location of Curb Ramps
All curb ramps should be built within the pedestrian zone and should not protrude to parking or any other
vehicular area. However, in locations such as street crossing, road islands, road dividers and so on, curb ramps
shall strictly be located within the pedestrian areas and shall follow the guidelines Figure 3.D.15 and 3.D.16.
D.11 ACCESSIBLE RAMPS
Accessible ramps shall be used to provide connectivity between levels having height difference of more than
150 mm within a facility which are not served by accessible lift facilities. All such ramps shall comply with the
provisions of Sections D.4 and D.5.
D.11.1 Gradient, Width and Surface of Accessible Ramp
The gradient of an accessible ramp shall follow the provisions of Table 3.D.2. The width of an accessible ramp
shall not be less than 1200 mm. All surfaces of curb ramps shall be slip-resistant and shall have a detectable
warning surface of contrasting color and texture complying with provisions of Sec D.29 for visually impaired
persons. Where the horizontal run of an accessible ramp exceeds 9.0 m in length, there shall be a landing of at
least 1500 mm length with tactile warning surface as shown in Figures 3.D.17 and 3.D.18. All such ramps shall
have hand rails on both sides complying with provisions of Sec D.9.
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D.12 ACCESSIBLE STAIRS
D.12.1 General
Stairs cannot provide accessibility for all persons with disability. Therefore stairs can only be an optional
requirement for the ambulant disabled along with lifts or ramps. Any such stair or staircase should comply with
the requirements of Sections D.12.2 to D.12.4. All handrail of accessible ramp shall have extensions either to
floor or to wall as shown in Figure 3.D.19. For safety reason stairs with open risers or risers with projecting
nosing as shown in Figure 3.D.20 shall not be considered as accessible stair for ambulant disabled.
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Figure 3.D.15 Location of curb ramp at street crossing
Figure 3.D.16 Location at road dividers 3-137
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Figure 3.D.17 Plan of straight ramp and landing
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Figure 3.D.18 Plan of right-angled ramp and landing
Figure 3.D.19 Hand rail extension (to floor or wall) Figure 3.D.20 Stair detail
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D.12.2 Tread, Riser and Nosing
All continuous flights of steps shall have uniform riser height of maximum 150 mm and tread width of minimum
300 mm. The risers shall be either vertical or receded back as per guidelines of Figure 3.D.21.
All steps should be fitted with contrasting visually detectable non-slip nosing as shown in Figure 3.D.21.
D.12.3 Warning Indicators
Stairs like any other level changes poses risks of accidents to persons with visual impairment. So all stairs in an
accessible facility shall have detectable tactile warning strips provided at the top, bottom and intermediate
landings in compliance to provisions of Sec D.29, Figures 3.D.21 and 3.D.22.
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Figure 3.D.21 Tactile warning at beginning and ending of stairs and detectable edges
Figure 3.D.22 Tactile warning in staircase 3-139
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D.12.4 Stair Handrails
Stair handrails shall comply with provisions of Sec D.9.2. Such handrails shall be installed on both sides of a stair
as shown in Figure 3.D.23 and shall be installed between 800 mm and 900 mm height measured vertically from
the pitch line of the steps to the top of the handrails. Stair handrails shall be continuous throughout the entire
length of the stair and extend at least 300 mm beyond the top and bottom step as shown in Figure 3.D.23.
D.13 ACCESSIBLE SEATING SPACE AND COUNTER SERVICES
Any accessible seating space for wheelchair users such as work stations, tables, service counters in any building
occupancy shall have a clear floor space not less than 900 mm x 1200 mm. Where a forward approach is
required, the clear knee space shall be at least 900 mm wide, 480 mm deep and 700 mm high as shown in Figure
3.D.24. Writing surfaces or service counters shall not be more than 800 mm from the floor as shown in Figure
3.D.24.
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Figure 3.D.23 Handrail in stairway
Figure 3.D.24 Forward or side approach to table or counter
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D.14 SANITARY PROVISIONSBNBC 2015 FINAL DRAFT
D.14.1 General
In building occupancies described in Sec D.3, at least one toilet in each floor of a building or 5 percent of total
toilets of the building, whichever is large, must be accessible. Among all accessible toilets preferably all or at
least one shall be unisex in design provisions. The minimum dimension of an accessible WC compartment shall
be 1500 mm x 1750 mm. All such toilets shall preferably have access directly from the accessible route. When
they are part of a group of toilets, a clear approach path up to the accessible compartment with minimum of
1200 mm width shall be ensured. All accessible toilets shall have an emergency call button complying with the
provisions of Sec D.17.
D.14.2 Fixtures and Accessories of Accessible Toilets
All fixtures in an accessible toilet shall abide by the provisions of this Section along with Sections D.16 and D.20
for minimum dimension, clearance from wall and other accessible clearances and limits along with minimum
clear space for wheel chair maneuvering.
D.14.2.1 Accessible wash basin
All accessible basins shall comply with the provisions of Figure 3.D.25.
The faucets and other controls of such basins shall not involve powerful grasping or twisting of wrist and shall
preferably be automatic or lever operated. If hot water provisions are there, proper insulation must be made to
ensure safety of user.
D.14.2.2 Accessible water closet
The center line of a water closet in an accessible toilet shall maintain a distance of 460 mm to 480 mm from the
adjacent sidewall. The front edge of such water closet shall be at least 750 mm away from the rear wall to allow
side transfer for wheel chair users. The seating top shall have a height between 450 mm to 480 mm from the
floor level. All such water closet shall have a back support to lean against it in the form of a seat lid or a flush
tank or an added support. The flushing control if not automatic shall be located on the transfer side of the water
closet. Figure 3.D.26 shows the basic requirements for such water closets.
D.14.2.3 Accessible urinals
Where urinals are provided, at least one shall be of wall hung type with a clear floor area of 750 mm x 1200
mm with level floor plane. The rim height of such urinals shall not be more than 400 mm measured from the
floor. Any privacy shield on side shall have at least 120 mm clearance from the grab bars as shown in Figure
3.D.27. All such grab bars shall be installed as per provisions of Figure 3.D.27.
D.14.2.4 Washroom accessories
All washroom accessories such as towel rail, soap dispenser, waste bin, hand dryer, mirror, emergency call
bell etc. shall be located within close proximity and shall comply with the provisions of Figure 3.D.28 and Sec
D.17.
D.14.2.5 Signs at washroom entrances
All accessible toilets shall have clearly visible signs at washroom entrances complying with the provisions of
Sections D.26.2 and D.27.
D.15 DOORS OF ACCESSIBLE WASHROOM AND WATER CLOSET COMPARTMENT
Any door of an accessible washroom and water closet compartment in fully open position shall have an
unobstructed opening of at least 900 mm. For such doors, pull and push bars, sufficient clearance at both pull
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and push side of the door for wheel chair maneuvering shall be provided in compliance with guidelines of Sec
D.8, Figure 3.D.29 to 3.D.31. All doors for accessible washroom and water closet compartments should
preferably swing outward.
D.16 GRAB BARS
Any accessible toilet and bathing facility shall be mounted with at least two grab bars for each toilet fixtures
except wash basin. The grab bars shall have a cross-sectional area complying with the provisions of Sec D.9. The
length of such grab bars shall not be less than 600 mm. When both horizontal and vertical grab bars are
required it is preferable that they should be continuous. All such grab bars shall follow the guidelines of Figure
3.D.28.
A horizontal grab bar mounted to the closest side wall of the water closet shall have a length starting from the
rear wall and extending at least 450 mm beyond the front edge of the water closet and the same wall shall have
a vertical grab bar as illustrated in Figures 3.D.31 to 3.D.33.
A foldable grab bar shall be mounted on the wider transfer side of the compartment as illustrated in Figures
3.D.26 and 3.D.29. keeping a clearance of 380 mm to 400 mm from the center line of the water closet and same
height with other grab bars. Foldable grab bars shall not extend more than 100 mm from the front edge of a
water closet.
D.17 EMERGENCY CALL BELL
All accessible toilets, water closet compartments and wash rooms shall have a water proof emergency call bell
in each compartment. Such emergency call bells shall be either push-button type or pull-chord type located for
convenience of use at a height between 600 mm to 650 mm above the floor level. The buzzer of such call bells
shall be so located that immediate attendance shall be available quickly.
D.18 INDIVIDUAL WATER CLOSET COMPARTMENT
Any accessible water closet compartment for wheel chair users as required in Sec D.14.1 shall have a minimum
internal dimension of 1500 mm x 1750 mm. All such water closet compartments shall comply with the
provisions of Sections D.14.2.2, D.15, D.16, D.17, Figures 3.D.26 and 3.D.29.
D.19 WATER CLOSET COMPARTMENT IN PUBLIC TOILET
Any accessible water closet compartment for wheelchair users in a public toilet facility shall have a clear internal
dimension of not less than 1500 mm x 1750 mm. All such water closet compartments shall comply with the
provisions of Sections D.8, D.14.2.2, D.15, D.16, D.17 and Figure 3.D.30.
D.20 BATH FACILITIES
D.20.1 General
All residential occupancies, where accessible toilets are required by the provisions of Sec D.3, shall be provided
with accessible bathing facilities either by providing bathtub complying with Sec D.20.2 or by providing shower
stall complying with Sec D.20.3. Sports facilities and public swimming pools that need accessible provisions
according to Sec D.3.1 shall also be provided with shower compartments in both male and female areas
complying with Sec D.20.3.
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Figure 3.D.25 Details of accessible wash basin
Figure 3.D.26 Accessible water closet for wheel chair users 3-143
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Figure 3.D.27 Basic dimensions for accessible urinals
Figure 3.D.28 Standard dimensions for wash-room accessories and grab bars
Figure 3.D.29 Water closet compartment for wheel chair users
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Figure 3.D.30 Detail of water closet compartment in group toilet
D.20.2 Accessible Bathtub
Any accessible bathtub shall have a clear floor space of at least 750 mm x 1200 mm along its length as shown in
Figure 3.D.31. A seat of at least 250 mm width along the entire length or width of such bathtub as shown in
Figure 3.D.31 and shall be required. The floor of accessible bathtubs shall be slip resistant. The base of such
bathtubs shall be slip-resistant. All accessible bathing facility shall have grab bars complying with Sec D.9 and
with the provisions of Figures 3.D.31 and 3.D.32. Shower heads in such facilities shall be hand-held type with
flexible cords and shall comply with the provisions of Figures 3.D.31 and 3.D.32. All other accessories of such
facilities shall comply with Sec D.14.2.4.
D.20.3 Accessible Shower Stall
An accessible shower stall shall have internal dimensions of at least 1500 mm x 1500 mm and shall comply with
the provisions of Figure 3.D.33. The floor and seat of such accessible shower compartment shall be slip-
resistant. The shower heads of such showers shall be hand-held type with flexible cord. All faucets and
accessories of such shower compartments shall follow the guidelines of Sec D.14.2 and Figure 3.D.33. All such
shower compartments shall have grab bars in compliance with Sec D.9, Sec D.16 and Figure 3.D.33. Any level
change of such floor shall not be more than 10 mm and shall be negotiated with a slope ratio of one vertical to
two horizontal.
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Figure 3.D.31 Bathtub for persons with disabilities
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Figure 3.D.32 Layout plan for 3 fixture toilet
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Figure 3.D.33 Accessible shower stall for wheelchair user
D.21 KITCHEN FACILITIES
An accessible kitchen may have an open layout (e.g. pass-through type) or a closed layout (e.g. U-shaped). The
open layout consists of a straight pass through aisle, which can be entered from both ends and where working
top, appliances and cabinets are on two opposing sides as shown in Figure 3.D.34 (A).The clear width of such
aisle shall be not less than 1015 mm.
The closed layout requires turning radius of a wheel-chair within the kitchen area resulting in a layout enclosed
on three contiguous sides ensuring a minimum clearance of 1525 mm between all opposing cabinets, working
tops, appliances and walls, as shown in Figure 3.D.34 (B).
All appliances shall be clearly approachable either by front approach or by parallel approach. Where a forward
approach is provided, the clear floor or ground space shall provide knee and toe clearance as per provision of
this Code. Knee and toe space under cooking range shall be insulated to prevent burns or abrasions or electrical
shock. At least fifty percent of all cabinets and storage spaces shall be accessible as per provision of this Code.
The height of the working top, sink, cooking range and all necessary appliances shall follow the guidelines for
accessibility of this Code.
D.22 LIFTS
D.22.1 General
Buildings, where lifts are needed as part of requirement by the building authority, should have at least one
accessible lift for vertical circulation from the entrance level and serve all levels intended for use by persons
with disabilities. Lift lobby for such facilities shall have a minimum dimension of 1500 mm x 1500 mm. The
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minimum size of an accessible lift car shall be 1500 mm x 1725 mm with a clear door opening of not less than
900 mm. Such accessible lifts shall follow the guidelines of Sec D.5 for floor finish, Sec D.9 for horizontal grab bar
on back and side walls and the guidelines of Figure 3.D.35. All accessible lift shall have tactile marking and Braille
on all buttons.
Figure 3.D.34 Accessible kitchen clearance
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Figure 3.D.35 Lift for persons with disabilities
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D.23 EATING OUTLETS
D.23.1 General
All eating outlets, with or without fixed seats, as mentioned in Sec D.3 shall have provisions of access for
persons with disabilities complying with Sec D.23.2. Any aisle of circulation in such outlets shall be at least 1200
mm wide.
D.23.2 Seating
In an accessible eating outlet, the minimum clear space between seats in the required number of accessible
tables shall be 750 mm measured along the edge of the table as shown in Figure 3.D.36. All such tables provided
for persons with disabilities shall comply with provisions of Figure 3.D.37. All such tables should be clearly
marked with accessibility symbol and shall have directional signage for indicating location.
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Figure 3.D.36 Space requirement for accessible seating Figure 3.D.37 Clearance for accessible seating
D.24 ACCESSIBLE PARKING AREA
D.24.1 Parking Provision
In all occupancies referred in Sec D.3 where vehicle parking is required, the number of accessible parking stalls
for vehicles for persons with disabilities shall be in accordance with Table 3.D.3. Such parking lots should be
located as nearer as possible to the accessible entrance of the building. Pedestrian accessible routes connecting
accessible parking shall be such that it avoids the risk of collision between an ambulatory disabled person and a
backing out vehicle in a parking lot. Such parking shall not be occupied by vehicles of persons without disability.
Table 3.D.3: Minimum Number of Accessible Parking Stalls
Number of vehicle park stalls Number of accessible stalls
For first 50 stalls 1
Next 400stalls 1 additional stall per 100 parking stalls or portion thereof
Above 450 stalls 6
D.24.2 Symbols and Signage
Each accessible parking stall shall be clearly designated with the symbol of access, in accordance with the
requirements of Sec D.26.2.
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Such Symbol shall be painted in contrasting color at the center of the accessible parking stall, having a
dimension between 1000 mm x 1000 mm to 1500 mm x 1500 mm and complying with provisions of Sec D.26.2.
The symbol of accessible parking shall be displayed at all approaches and entrances of parking lot indicating the
location of such parking within the lot. Directional signs shall be displayed at every change of direction to direct
persons with disabilities or their vehicle to the point of accessible parking stall.
D.25 ACCESSIBLE VEHICLE PARKING STALLS
The minimum dimension of an accessible vehicle parking stall shall be 4800 mm x 3200 mm. All such parking
shall be provided on a firm, non-slippery, leveled solid surface and if possible, be covered. Figure 3.D.38 shows
the detail of an accessible parking stall.
BNBC 2015 FINAL DRAFT
Figure 3.D.38 Accessible parking stall and approach
D.25.1 Signage
Any accessible parking lot shall be identified by the symbol of access in accordance with Sec D.26.2. The size and
location of all signs should be such that they ensure clear visibility all along the accessible route.
D.26 THE SYMBOL OF ACCESSIBILITY
D.26.1 General
The Symbol of Accessibility is an internationally accepted language that shall be permanently and clearly
displayed to indicate and/or direct to the location of various accessible facilities in and around a building. All
buildings or facilities mentioned in Sec D.3.1 shall display the required symbol of accessibility in compliance with
the guidelines of this Code. Any such signs and symbols shall be simple, short and easy to understand. The text
and use of pictographs shall be consistent throughout the building and outdoors in any accessible facility.
D.26.2 Symbol of Access
The form of the symbol of access shall consists a symbolized figure on a wheelchair and a contrasting plain
square background as shown in Figure 3.D.39 where the symbolized figure shall be white on a blue background
and shall always face to the right.
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Any building that offers accessible facilities shall clearly display the symbol of access at road front. Inside the
premise the symbol shall denote the location of the accessible facilities including accessible parking, accessible
routes, entry and other accessible services and facilities for persons with disabilities.
D.26.3 Directional Signs
Whenever changes in direction occurs directional signs incorporating the symbol of access similar to Figure
3.D.40 shall be displayed. This shall include main lobbies, passageways and all points where there is a change of
direction to direct persons with disabilities to various accessible functions and facilities such as lifts, entrances,
toilets, car parks and the like.
Where the location of the designated facility is not obvious or is distant from the approach viewpoints,
directional signs incorporating the symbol of access, as shown in Figure 3.D.41, should be placed along the route
leading to the facility.
BNBC 2015 FINAL DRAFT Figure 3.D.40 Accessible directional sign
Figure 3.D.39 Symbol of access for persons with disabilities
D.26.4 Service Identification Signs
Every accessible route shall contain service identification signs showing appropriate symbol of accessibility for
persons with disabilities, as shown in Figure 3.D.42, to indicate the presence and direction to various service
facilities such as entrances, lifts, telephone booths, toilets, vehicle parks, staircases and the like. Tactile
pictographic signs shall distinguish between male and female toilets.
Figure 3.D.41 Signs directing to facility
Figure 3.D.42 Service Identification Signs at Destination 3-151
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D.27 SIGNAGE
D.27.1 Specifications for Characters and Symbols
Letters and numbers, when put on signs shall be legible and shall be consistent in font type all along the
accessible facility. Only ‘CAPITAL LETTER’s shall be used in such signage. Braille, if written, shall be located
directly below the text or arrow in a signage.
D.27.2 The Size of Symbols
The size of symbols depending upon the distance it is intended to be first viewed from shall vary and shall be in
accordance with Table 3.D.4.
Table 3.D.4: Size of symbols varying with distance
Viewing distance (m) Symbol size (mm)
Up to 7.0 60 x 60
7.0 to 18.0 100 x 100
Above 18.0 200 x 200 to 450 x 450
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D.27.3 The Height of Letters
The height of letters in signs depending upon the distance it is intended to be viewed from shall vary and shall
be determined in accordance with Table 3.D.5.
Table 3.D.5: Height of letters varying with distance
Required viewing distance (m) Minimum height of letters (mm)
1.5 50
2.0 60
2.5 100
3.0 120
4.5 150
6.0 200
8.0 250
D.27.4 Location of Signs
All signs shall be located such that they are clearly and legibly identifiable form an accessible route. Any change
of direction in an accessible route shall always contain necessary directional signs for users. In case of internal
signs the center line of the sign shall be at a height within the field of vision and preferably at 1500 mm above
the floor level.
D.27.5 Tactile Characters or Symbols
Tactile characters or symbols when used on a sign shall have a size between 16 mm to 50 mm and shall be
raised at least 0.8 mm above the background surface. All such signs shall be mounted at a height complying with
Sec D.27.4.
D.27.6 Braille and Pictographs
When Braille, the tactile language, is used the Braille dot shall be raised in dome shape from the base and the
sign shall be easy to touch and read. The height of all such signs shall comply with Sec D.27.4.
Pictographs, when used shall be supported by equivalent textual description placed directly below it.
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D.28 GRADING OF SLIP RESISTANCE
For the purpose of accessibility, surface materials to be used as floor finishes should be graded for slip
resistance in both dry and wet conditions. Table 3.D.6 indicates the slip resistance of some commonly used
finish materials.
Table 3.D.6: Slip resistance grading
Grading Co-efficient of surface Example
Very good friction Clay tiles, carpets, dry rubber
More than 0.75
Good Between 0.75 to more than 0.4 Concrete pavers, dry terrazzo
tiles, dry marble and granite
Poor to Fair Between 0.4 to 0.2 Wet and polished terrazzo
tiles, marble and granite
Very poor Less than 0.2 Wet rubber
D.29 TACTILE GROUND SURFACE INDICATORS
D.29.1 Path of Travel and Mobility
People with different forms of visual impairments can be assisted to find their way independently with the help
of some physical or sensory cues e.g. landmarks and mind maps. For such users a predictable, logical and barrier
free access route is required. Therefore all such path of travel dedicated to universal accessibility should be
designed as free from barriers, hazards or obstructions along with physical and sensory cues for such users.
D.29.2 Physical Cues
Physical cues are designed elements including buildings, walls, ground surfaces, railings, fences and curbs that
can act as cues or clues to assist a visually impaired person. Such persons can identify physical cues either by use
of a white cane, under foot, or by echo-location. All public buildings referred in Sec D.3 shall have physical cue
both inside and outside the building to assist visually impaired persons.
Tactile ground indicators are designed physical cue to convey two important indications to visually impaired
persons- a. directional indications and b. caution or warning indications.
Directional indicators, Figure 3.D.43, act as physical cues to guide persons with visual impairment to travel
through an accessible route free from obstructions from beginning to end.
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(a) Directional indicator: top view (b) Directional indicator section detail
Figure 3.D.43 Directional indicators on ground of accessible route
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Warning indicators are physical cues for warning users of an adjacent hazard or a destination. Such hazards
include but not limit to level changes, change of direction, approaching vehicular roads, obstructions etc.
The pattern and dimensions of warning indicator are shown in Figure 3.D.44 (a) and (b).
Figure 3.D.45 shows the combined use of both directional and warning tactile indicators in an accessible route.
(a) Warning indicator: top viewBNBC 2015 FINAL DRAFT(b) Stud detail
Figure 3.D.44 Warning Indicators on ground of accessible route
Figure 3.D.45 Use of tactile indicators in accessible route
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Appendix E
Building Types, Development Rights and
Buildings Abutting Property Lines
E.1 GENERAL
These guidelines cover the planning and general building requirements of different building types such as
attached type, detached type, semi-detached type etc. regarding their development rights and rights regarding
building on abutting property lines. These requirements are applicable to all occupancy types taken up by
public, private or co-operative agencies.
E.2 DEFINITION AND TYPOLOGY
The following are some definitions and diagrams to explain different typologies and terminologies relevant to
this Code:
E.2.1 Row Type Building
A row type building abuts two side plot party-lines and is one of a row of buildings on adjoining zoning lots. The
end buildings of a row of attached buildings are considered semi-detached buildings if they each have minimum
side setback. Here the rest two (non-abutting) sides of the building are surrounded by yards or open areas
within the plot confirming at least to minimum setback requirements (Figure 3.E.1).
E.2.2 Semi-detached Building
A semi-detached building is a building that abuts one side on the party-line of a plot and does not abut any
other building on any other side of any adjoining plot/s; here the rest three (non-abutting) sides of the building
are surrounded by yards or open areas within the plot confirming at least to minimum setback requirements
(Figures 3.E.2 and 3.E.3).
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Figure 3.E.1 Row type buildings 3-155
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Figure 3.E.2 Semi-detached building (not abutting neighbouring building)
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Figure 3.E.3 Semi-detached building (abutting neighbouring building)
E.2.3 Detached Building
A detached building is a freestanding building that does not abut any other building on an adjoining plot and
where all sides of the building are surrounded by yards or open areas within the plot confirming at least to
minimum setback requirements.
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Figure 3.E.4 Detached building
E.3 SPECIAL PROVISIONS FOR CONSTRUCTION OF THE WALL ABUTTING PARTI-
LINE/ SITE BOUNDARY LINE
E.3.1 General Requirements
Walls abutting any parti-line shall have no opening.
A parti-wall shall not contain any concealed lines (water, gas, sanitary, electricity etc.).
A parti-wall shall be so constructed that it remains moisture free, leak proof and confirms to the fire safety
requirements as referred in Part 4.
A parti-wall shall confirm with structural guidelines for earthquakes and pounding gaps given in Chapter 1, Part
6 of this Code. When the adjacent buildings are designed separately, pounding gaps are mandatory. When
adjacent buildings are designed and built in an integrated way through plot consolidation, no such gap is
required.
E.3.2 Shared Parti-Wall
A parti-wall, if formally (in written form) agreed upon between two adjoining owners, may become a shared
wall between the two properties built half on the land of each of the two owners or in such other position as
may be agreed between the two owners, with both having equal rights on the use of that wall. In such cases the
structural guidelines of this Code shall be abided by both parties to allow future modifications on either side of
the party-wall.
E.3.3 Independent Parti-Wall
For all other cases, the owner who intends to build a parti-wall, shall make it wholly on his own land abutting
the parti-line or plot boundary line and shall reserve individual right/s (not shared) of use of that wall. Parti
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walls, in such cases, are one or two walls abutting parti-line or having pounding gap as per structural
requirement of Part 6 built on same or different times.
E.3.4 Non-Crossing of Parti/Property Line
Under all circumstance, above ground or underground, the foundation/ footing of any wall/ column or any other
part of building or services, shall not cross the parti-line or plot demarcation line.
E.3.5 Foundation of Parti-Wall
For all foundation work the safety of the buildings on adjoining land or plot must be ensured. The building
owner who intends to erect wall abutting the side parti-line, if necessary shall, at his own expense underpin or
otherwise strengthen or safeguard the foundations of the building or structure of the adjoining property.
E.3.6 Structural Independence
Buildings with parti-wall on adjacent plots must be structurally independent. Depending upon the plot frontage
and the choice of structural system a parti wall may also be non-structural or non-load bearing wall. Where
parti-wall or any part of it is structural, the footing/ foundation provisions must comply with article E.3.4 of this
section.
E.3.7 Utility Lines and Drainages
E.3.7.1 Underground or surface lines and drainages
For all underground/concealed utility pipe lines, drains, ducts, etc., the outer edge of such utility pipe lines/
drains/ ducts shall be at least 900 mm inside from the parti-line within the plot to ensure maintenance
accessibility without hampering parti-wall or the adjacent neighbor. For all such lines provisions for easy
maintenance must be kept beforehand.
Any surface drain/ inspection pit (on finished ground level) shall be at least 250 mm inside from the parti-line
within the plot.
E.3.7.2 Vertical utility lines or drainages
Under all circumstances, vertical utility lines/ducts shall not cross the parti line or plot demarcation line. No
pipes, gutters, spouts, surface holes or any other type of drainage outlet to the adjoining properties can be
given; special measures shall be taken to contain all drainages within the site.
E.3.7.3 Prevention of leakage
Any leakage or infiltration from these lines to neighbouring property must be prevented during and after
construction. For such leakages the landowner who owns such utility lines shall be responsible to repair and
compensate for any damage thereby.
For two adjacent walls abutting the same property line, the gap in between must be properly sealed.
E.4 OTHER REQUIREMENTS
With the exception of clauses mentioned above, requirements of building will be governed by the provision of
this Code and good practice.
Measures must be taken for prevention of infiltration of rain, dust and moistures through joineries of parti-walls
with pounding gaps between two adjoined properties. Proper treatment for damp proofing and termite
proofing in compliance with Part 6 shall be ensured. Chemical treatment to prevent long term growth of fungi
and other microbial forms are recommended on such walls.
A parti-wall shall be a barrier wall in compliance with the guidelines of Part 4 to ensure fire safety of the
adjoining property. Other requirements of fire safety, structural design, building services and plumbing services
shall be as specified in this Code.
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Appendix F
Road Hierarchy, On-Street and Off-Street
Parking
F.1 INTRODUCTION
Road is an integral part of a settlement and its land-use planning. For public safety in any new development the
hierarchy of road network with measures for gradual traffic calming and adequate safe parking, both on-street
and off-street, are of vital importance. Road width and road components, junctions, features of controlling
vehicles’ speed and turning, forward visibility and visibility splay at junctions are important tools of traffic and
speed control.
With increased density and parking demand, on-street parking shall be an important tool to increase overall
parking capacity as well as accommodation for service vehicles (e.g. garbage collection vehicle, maintenance
vehicles etc.). This measure is also expected to keep the pedestrian walkways free from unauthorized vehicular
parking.
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F.2 DEFINITIONS
CARRIAGEWAY Refers to driveway that provides access to the parking place. They do not have
parking stalls adjacent to them.
CARRIAGEWAY RAMPS Refers to inclined floors that provide access between two levels.
INSIDE LANE Refers to the innermost lane of a curve ramp, which is nearest to the center point of
curve.
INSIDE RADIUS OF LANE Refers to curved carriageway and driveway is the distance measured from the inside
curve edge to the center point of the curve.
MAXIMUM GRADIENT Refers to the steepest gradient of ramp measured along the center line of the ramp.
Gradient refers to the ratio of the inclination of the ramp (height length).
OUTSIDE LANE OF Refers to any lane positioned after the innermost lane.
CURVED CARRIAGEWAY
PARKING AISLE Refers to an access lane or driveway with adjacent parking stalls.
PARKING ANGLE Refers to the angle measured between the longer side of the parking stall and the
line of traffic flow of the aisle.
PARKING STALL Refers to the space required for parking of one vehicle. The space of the stall shall be
rectangular. The area of each stall shall be flat and free from curbs and other
obstructions.
SINGLE-LANE Refers to a lane where only one vehicle can pass through at any given time.
TRAFFIC FLOW Refers to the direction of vehicle movement.
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F.3 ROAD HIERARCHY GUIDELINES FOR NEW DEVELOPMENT
For any new development, at least three hierarchically interlinked road patterns should be followed (Figure
3.F.1): a. primary road, b. secondary road and c. internal/ access/ residential road. Though it is not mandatory to
provide wider than regulation pedestrian walkways (with provisions for street furniture), bi-cycle lane and
plantation zones parallel to walkways, it is strongly recommended that such provisions should be made,
especially at primary and secondary road level, as much as possible.
Primary Road: This refers to a Public way or portion thereof, on which vehicular traffic is given preferential
right-of-way, and at the entrance to which from intersecting public ways is required to be in obedience to a
traffic signal, stop sign, or yield sign as per traffic code. Primary roads connect settlements/ zones/ sectors with
rest of the city, which are capable of and usually are serviced by public transport facility (e.g. Bus service, Tram
service etc.). These roads define the edge of the settlement and shall be capable of hosting traffic interchange
(e.g. changing from one mode of transport to another). No individual plot should be accessed directly from a
primary road (Figure 3.F.2). The right of way of a primary road shall not be less than 18 meter (Table 3.F.1 and
Figure 3.F.3).
BNBC 2015 FINAL DRAFT
Figure 3.F.1 Road hierarchy
Secondary Road: A secondary Road is a collector road or distributor road of low to moderate-capacity, which
serve to move traffic from internal/ local streets to primary/arterial road. The flow of a collector road usually
consists of a mixture of signaled intersections or traffic circles with primary arterial roads or other collector
roads and un-signaled intersection with local/ internal/ residential roads.
A secondary road shall not be less than 13.5 m (Table 3.F.1 and Figure 3.F.4).
Internal/access/residential road: At the bottom of the hierarchy are local/Internal/access streets and roads.
These roads have the lowest speed limit, carry low volumes of traffic and often have pedestrian priority. The
minimum width of such road will depend on the density of the adjacent plots (Table 3.F.1, Figure 3.F.5).
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BNBC 2015 FINAL DRAFTFigure 3.F.2 Parking beside primary/arterial road
Figure 3.F.3 Minimum dimensions for primary road 3-161
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Figure 3.F.4 Minimum dimensions for secondary road
Figure 3.F.5 Minimum dimensions for Internal/access/local/residential road
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F.4 GUIDELINES FOR PEDESTRIAN WALKWAY
F.4.1 Any pedestrian path should be part of a pedestrian network connecting building users to different
facilities and part of a city or a settlement and should enhance pedestrian friendly environment.
F.4.2 Pedestrian path or walkways should be separated and protected from vehicular driveways and any
conflict between vehicular and pedestrian crossing shall be designed to ensure pedestrian safety.
Table 3.F.1: Minimum Widths of Public Means of Access to Residential Plots of new development
2-way On-street Pedestrian Bus Lane / Minimum right Minimum right of Minimum right Minimum right
vehicular Parking / walkway
Emergency Bus Stop of way/ ROW way/ ROW of way/ ROW of way/ ROW
road Vehicle W (m)
width Option-A* Option-B** Option-C*** Option D****
V (m) P (m)
B (m) V+W (m) V+2W (m) V+P+2W (m)
6
Main/ primary Nil 2 3.5 Nil Nil Nil 18.00
road
(V+2W X
1.25+2B)
Secondary road 5.5 2 2 Nil Nil Nil Nil 13.5
(V+2P+2W)
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Internal/ access 4.8 2 2 Nil 6.8 8.8 10.8 Nil
road
Note:
* For serving residential occupancy A1 and A2, the minimum right of way shall be option A
** For serving residential occupancy of A3 within walkup range the minimum right of way shall be option B
*** For serving residential occupancy of A3 above walkup range , the minimum right of way shall be option C
**** For serving residential occupancy of A3 in mixed use , the minimum right of way shall be option D
F.4.3 The minimum width of a pedestrian walkway which is not enclosed by adjacent walls on both sides shall
be 1 m; otherwise the minimum width shall be 1.25 m. However, depending upon the frequency of
pedestrian users the recommended minimum width for footpath or walkway shown in Table 3.F.2 may
be followed.
F.4.4 All public transport terminal and stoppages shall have dedicated planning for pedestrian users to and
from the facilities showing connection to the public pedestrian and vehicular network adjacent to the
site. Pedestrian walkways or footpaths in all such facilities shall be of sufficient width to cater the
pedestrian need of the facility.
Table 3.F.2: Recommended minimum width of pedestrian walkway based on frequency of use
Peak pedestrian frequency Width of Width for street furniture Total recommended
(pedestrian user per minute) walkway and plantation width
(m) (m) (m)
Up to 60 2.5 1.5 4
Above 60- 80 3.25 1.5 4.75
Above 80- 100 4.0 1.5 5.5
Above 100 5.0 1.5 6.5
F.5 GUIDELINES FOR ON-STREET PARKING
For on-street car parking in any new settlement, the guidelines of Table 3.F.1 shall be the minimum requirement
depending upon the type of road and expected traffic density.
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F.5.1 Parking along Primary Road
For primary roads, fast moving uninterrupted traffic flow needs to be ensured. Therefore such roads shall not
serve for on-street parking. If, parking besides such primary roads becomes necessary, then an additional
carriageway with on-street parking and an additional pedestrian walkway as shown in Figure 3.F.6 may be
planned, keeping the main traffic flow uninterrupted.
F.5.2 Parking along Non-Primary Roads
On-street parking should normally only be considered on local distributors and roads lower in the hierarchy. On
such roads, on-street parking spaces may be provided where off-street facilities are inadequate to meet
demand and where provision would not adversely affect the flow of traffic. On-street spaces should generally
cater for short term parking needs and parking meters may be installed to encourage such usage.
F.5.3 Parking for Service Vehicles
In most situations, it will not be necessary to provide parking spaces specifically for service vehicles, such as
delivery vans, which are normally stationary for a relatively short time. If such parking bays are considered
necessary, other vehicles may need to be prevented from using the spaces by regulation and enforcement.
F.5.4 Omission and Conversion of Existing Parking
Omission and conversion of existing parking spaces shall not be permitted if it results in parking deficiency for
the occupancy type. That is, after omission and conversion, the remaining number of parking spaces must be
sufficient to meet the minimum requirement of the existing, proposed and approved development.
F.5.5 Parking Design Considerations
Any parking space design will consider the following two factors:
(a) Minimum parking requirement ascertained for each type of occupancy
(b) Parking layout for the required number of parking (Figures 3.5.7 to 3.F.13)
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Figure 3.F.6 Provision for on-street parking beside primary road
F.6 MINIMUM REQUIREMENT FOR OFF-STREET PARKING
The number of minimum parking spaces required shall be based on the total floor area of the building and shall
depend on its occupancy type and number of users. The following tables (Table 3.F.3) shall form the basis for
computation of minimum parking requirement:
Table 3.F.3: Off-street parking requirements for different occupancies
Occupancy type/use Minimum off-street parking
requirements
Residential (occupancy type-A) 1 car parking
Small private dwellings/ row house with plot size
not more than 134 m²
Small private dwellings/ row house with plot size 2 car parking
134-268 m²
Multi-family housing with flats/ apartments with gross 1 car parking/unit + 5% guest parking
area more than 200 m²
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Residential (occupancy type-A) Flats/ apartments with gross area more than 140 m² 2 car parking per 3 units
to 200 m²
Flats/ apartments with gross area more than 90 m² 1 car parking per 2 units
to 140 m²
Flats/ apartments with gross area more than 60 m² 1 car parking per 4 units
to 90 m²
Flats/ apartments with gross area up to 60 m² 1 car parking per 8 units
Flats/ apartments with gross area up to 90 m² (in 1 motorcycle parking per 5 units
addition to required car parking)
Hotels (star category) 1 car parking per 5 guest rooms
Hotels (other category) 1 car parking per 200 m² gross area
Others 1 car parking per 300 m² gross area
The minimum parking requirements for all residential occupancies within 500 m radius of MRT or BRT
stations shall be 25 percent of the calculated requirement from above
Educational (Occupancy type-B) 1 car parking per 200 m² gross area
Educational (Occupancy type-B) Kindergarten, primary schools, high schools, For plots with 25 m or more frontages, an
colleges, tertiary educational institution, training uninterrupted dropping bay of at least 25 m
centers, universities and other educational length and 4.25 m width shall be given at
institutions ground level within the school premises.
For plots with less than 25 m frontage, an
uninterrupted dropping bay with length equal
to total frontage of the plot and 4.25 m width
shall be given at ground level within the school
premises
At primary and secondary schools there should
be a minimum of 3 lay-bys for school buses
within the school boundary
Institutional and Institutional Type (Occupancy type-C) 1 car parking per 200 m² gross area
Health care Type
(Occupancy type-C Hospitals, clinics (Occupancy type-D) 1 car parking per 5 beds
and D) Medical diagnostic centers 1 car parking per 100 m² gross area
1 car parking per 200 m² gross area
Others (outdoor treatment facilities, collective
practice of physicians etc)
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Business and Mercantile Occupancy type/use Minimum off-street parking
(Occupancy type-E and F) requirements
Mercantile (Occupancy type-F)
Shops, department store 1 car parking per 200 m² gross area
1 loading/ unloading bay of heavy goods
Restaurants vehicle per 2000 m² gross area or portion
Business (Occupancy type E) and Offices thereof
Others
1 car parking per 100 m² gross area
1 car parking per 200 m² gross area
1 car parking per 200 m² gross area
Industrial Industries (Occupancy type-G) For all such installations, at least 1 truck
(Occupancy type-G) Storage (Occupancy type-H) parking along with loading unloading bay and
at least 1 car parking.
and Storage
(Occupancy type-H) For administrative or sales centers within these
installations, 1 car parking per 200 m² for such
parts only are required
Assembly (Occupancy type- I)
Cinema
Theatre, auditorium
Sports facilities
Transportation terminals, airports, railway
stations, etc (Occupancy I or MIXED)
Assembly (Occupancy type- I) BNBC 2015 FINAL DRAFT 1 car parking per 40 seats
Wedding/ party center (Occupancy I or MIXED)
1 car parking per 20 seats
Religious Up to 300 m² 1 car parking per 200 seats
structure More than 300 m²
1 car parking per 50 m² gross area
Others
1 car parking per 25 m² gross area
For plots with 25 m or more frontage, an
uninterrupted dropping bay of at least 25 m
length and 4.25 m width shall be given at
ground level within the school premises
At least 1 car parking
1 car parking per 50 m² gross area
1 car parking per 200 m² gross area
Hazardous Hazardous (J1 and J2) For all such installations, at least 1 truck
(Occupancy type- parking along with loading unloading bay and
at least 1 car parking.
J)
For administrative purpose within these
installations, 1 car parking per 200 m² for such
parts only are required
Note:
For mixed-use situation, parking requirement shall be calculated by adding up the individual parking requirements of
each types based on their use area per floor and respective parking ratio for each type.
For different types of flats/apartments within the same complex, parking requirements shall be determined by
determining requirement for each type separately and then adding them together.
Fractional results in parking calculation shall be considered as 1 (one) full parking space.
With recommendation from the permitting authority parking requirement for low income residential areas may be
reduced.
For flats with area less than 90 m², parking requirement of 1/3rd requirement of cars can be calculated by combining
cars and motorcycles in the ratio of 1 car to 2 motorcycles.
For any building type, at least 1 (one) car parking shall be required.
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F.7 CAR PARKING LAYOUT GUIDELINES
F.7.1 Parking Stalls
Parking stall is a rectangular space with defined length and width, where the length is subject to variation
depending on its relationship with the aisle, Figure 3.F.7.
For perpendicular or angular parking, the minimum dimensions required of a car parking stall shall be:
Stall width: 2400 mm
Stall length: 4800 mm
For parallel parking minimum dimensions required of a car parking stall shall be:
Stall width: 2000 mm
Stall length: 6000 mm
For parallel parking, where cars cannot be parked by reversing, minimum stall length shall be 7200 mm; the
floor of each stall shall be flat and free from curbs and other interferences.
Where parallel parking stalls have frontal obstruction or perpendicular parking stalls have side obstruction, the
stall sizes will vary in accordance with guidelines of Figure 3.F.8.
F.7.2 Minimum Width of Driveway
The minimum width of parking aisle or driveway shall follow the requirements of Table 3.F.4.
BNBC 2015 FINAL DRAFT
Figure 3.F.5 Parking stall requirements 3-167
Bangladesh National Building Code 2015
Part 3
General Building Requirements, Control and Regulation
BNBC 2015 FINAL DRAFT
Figure 3.F.8 Parking stall size variation due to obstructions
Table 3.F.4: Minimum width of Parking Aisle/Driveway
Parking Angle to One Way Traffic Two Way Traffic
Bays on One or Both Side
Aisle Bay on One Side Bays on Both Side
0° (parallel) 3600 3600
30° 3600 4200
45° 4200 4800 6000
60° 4800 4800
90° (perpendicular) 6000 6000
F.7.3 Minimum Dimension for Carriageway Ramps
Carriageway ramps are sloped driveway connecting and providing access between two levels for vehicles. For
safe maneuvering of vehicle on carriageway ramp guidelines of the subsections as under shall be followed.
F.7.3.1 Width of carriageway ramp
The width of a carriageway ramp shall comply with the guidelines of Table 3.F.5 and Figure 3.F.9.
Table 3.F.5: Minimum width of Carriageway Ramps
Type of Carriageway Ramp Single Lane Dual Lane
3600 mm 6000 mm (3000 mm/lane)
(a) Width of straight
carriageway ramp
(b) Width of lane of curved 4200 mm 3600 mm for inside 3300 mm for outside
carriageway ramp lane lane
(c) Inside radius of curved 4500 mm
carriageway ramp
3-168 Vol. 1
Road Hierarchy, on-Street and Off-Street Parking Appendix F
Figure 3.F.9 Carriageway ramp width
F.7.3.2 Carriageway ramp gradient
Ramp gradient specify the slope of a ramp expressed either in percentage or in ratio and calculated as follows:
BNBC 2015 FINAL DRAFT
Floor-to-floor height X 100
Ramp gradient (slope)% =
Ramp length along the horizontal plane
For same gradient on ramps, as shown in Figure 3.F.10 (a), the maximum slope shall be 12.5 percent (or 1:8).
Ramp gradient shall be measured along the center line of the ramp.
For change of gradient on ramp, as shown in Figure 3.F.10 (b), this slope may be increased up to maximum 20
percent, with transition slopes on both end that are sloped at half of the slope of the main ramp.
F.7.3.3 Parking ramp
When sloped parking stalls are directly approached from a same sloped ramp it is known as parking ramp and
the maximum gradient of such ramps shall be 5 percent (or 1:20).
F.7.4 Minimum Headroom
The height clearance from parking level floor to the bottom of the ceiling above shall be 2400 mm minimum.
However, for downward projection from overhead ceiling (e.g. beams, direction signs, sprinkler heads, electrical
fittings etc.) the clearance shall be minimum 2200 mm. Figure 3.F.11 shows the variable gradient of ramps used
for calculating changing gradients.
(a)
(b) 3-169
Figure 3.F.10 Ramps with (a) Same gradient; (b) Change in gradient
Bangladesh National Building Code 2015
Part 3
General Building Requirements, Control and Regulation
BNBC 2015 FINAL DRAFT
Figure 3.F.11 Relationship between floor-to-floor height, ramp gradient and ramp length
F.8 MOTORCYCLE PARKING PROVISIONS
F.8.1 Motorcycle Parking Stall Dimensions
The minimum stall length and stall width of motorcycle parking shall be 2400 mm and 1000 mm respectively.
F.8.2 Stall Location
Motor-cycle parking stalls can be provided at corners or any available space within the parking area provided
that they do not obstruct movement of other vehicles and pedestrians.
F.9 PROVISIONS FOR LARGE VEHICLES
For other vehicles the minimum dimension of parking stall, headroom clearance, carriageway width and turning
radius shall be in compliance with Table 3.F.6.
Table 3.F.6: Minimum Requirements for Large Vehicle Parking and Maneuvering
Type of Vehicle Stall Stall Headroom Minimum carriageway Inside Maximum
turning ramp gradient
Length Width clearance width radius
ratio
Light goods vehicles 7 m 3.5 m 3.6 m 4.5 m (single straight lane)
e.g. pickup, vans etc. 5.5 m (single curve lane)
7.4 m (dual straight lane)
Mini buses 8m 3.0 m 3.3 m 4.5 m (single straight lane) 1:12
12 m 3.5 m 3.8 m 7.5 m (single curve lane)
Buses 7.4 m (dual straight lane) 6.0 m
11 m 3.5 m 4.7 m
Heavy goods vehicle
e.g. trucks
Articulated vehicles 16 m 3.5 m 4.7 m 4.5 m (single straight lane) 1:15
e.g. container carriers, 9.0 m (single curve lane)
trailers etc. 7.4 m (dual straight lane)
3-170 Vol. 1
Road Hierarchy, on-Street and Off-Street Parking Appendix F
F.10 PROVISIONS FOR CAR LIFT AND MECHANIZED PARKING
F.10.1 General
To connect between different levels with vehicular access, car lifts can be used instead of a carriageway ramps.
However, where a site is so constrained that it is not technically feasible to place a conventional ramp to
connect between levels, mechanized parking may be installed. All such parking shall require queuing space as
per provisions of this Code.
F.10.2 Guidelines for car lifts in a parking
A car lift shall have two openings, allowing entry of a car from one direction and exit of the car to the opposite
direction. After entry to a facility or a building having car lifts, a minimum queuing space for at least 15 percent
of the total parking shall be provided within the site. On departure from site, at least one holding bay having
equal space of a parking stall shall be provided within the site (Figures 3.F.12 and 3.F.13).
The internal dimension of all such lifts shall not be less than 2600 mm x 6200 mm with a minimum discharge
capacity of 30 vehicles per hour. For every 50 vehicles 1 car lift shall be installed. To reduce queue at least two
lifts shall be installed in a facility or a building. Maximum number of parking using car lifts shall not exceed 200.
F.10.3 Guidelines for Mechanized Parking
A mechanized parking may involve stacking system or lateral displacement system or a combination of both.
The approach driveway width for a mechanized parking shall be at least 3.6 meter for one-way traffic and 6.0
meter for two-way traffic. After entry to a facility or a building having mechanized parking, a minimum queuing
space for at least 5 percent of the total parking shall be provided within the site.
Mechanized parking varies widely in type and specification; and shall be installed according to its
manufacturer’s specifications. In doing so and during its operation it shall not compromise the safety of the
building or the users in any way.
BNBC 2015 FINAL DRAFT
Figure 3.F.12 Queuing space and loading from and unloading to same road 3-171
Bangladesh National Building Code 2015
Part 3
General Building Requirements, Control and Regulation
Figure 3.F.13 Queuing space and loading from and unloading to different roads
BNBC 2015 FINAL DRAFT
3-172 Vol. 1
BNBC 2015 FINAL DRAFT
PART 4
FIRE
PROTECTION
PART 4
BNBC 2015 FINAL DRAFT Page
Chapter 1 GENERAL PROVISIONS
Chapter 2 PRECAUTIONARY REQUIREMENTS 4-1
Chapter 3 MEANS OF EGRESS 4-5
Chapter 4 EQUIPMENT AND IN-BUILT FACILITIES STANDARDS 4-13
Chapter 5 SPECIFIC REQUIREMENTS FOR FIRE DETECTION AND 4-29
EXTINGUISHING SYSTEM 4-45
Appendices
4-55
ABLE OF CONTENTS
PART 4 FIRE PROTECTION
Chapter 1 GENERAL PROVISIONSBNBC 2015 FINAL DRAFT 4-1
1.1 SCOPE 4-1
1.2 TERMINOLOGY 4-3
1.3 GENERAL REQUIREMENTS 4-3
4-3
1.3.1 Height and Area Limitation 4-4
1.3.2 Open Space or Fire Separation Requirement 4-4
1.3.3 Access Facilities for Fire Service 4-4
1.4 FIRE DRILL 4-4
1.5 FIRE TESTS AND FIRE RESISTANCE RATING
1.6 RELATED APPENDIX 4-5
Chapter 2 PRECAUTIONARY REQUIREMENTS 4-5
2.1 OCCUPANCY CLASSIFICATION 4-6
2.2 CLASSIFICATION OF CONSTRUCTION TYPES 4-6
2.3 FIRE ZONES 4-6
2.4 MIXED OR SEPARATED OR DETACHED OCCUPANCY 4-7
2.5 OPENINGS IN SEPARATION WALL 4-7
2.6 SMOKE AND HEAT VENTS 4-7
2.7 ELECTRICAL, GAS AND HVAC SERVICES 4-8
2.8 SURFACE FINISHES 4-9
2.9 GLAZING ASSEMBLIES 4-10
2.10 SKYLIGHTS 4-10
2.11 FIRE LIFTS 4-10
2.12 UTILITIES (OCCUPANCY L) AND EXEMPTED QUANTITIES OF HAZARDOUS MATERIAL 4-11
2.12.1 Occupancy A: Residential 4-11
2.12.2 Occupancy B: Educational 4-11
2.12.3 Occupancy C: Institutional 4-11
2.12.4 Occupancy D: Health Care 4-11
2.12.5 Occupancy E: Business 4-11
2.12.6 Occupancy F: Mercantile 4-11
2.12.7 Occupancy G: Industrial 4-11
2.12.8 Occupancy H: Storage 4-12
2.12.9 Occupancy I: Assembly 4-12
2.12.10 Occupancy J: Hazardous
2.12.11 Occupancy K: Garage Vol. 1
4-i
Part 4 BNBC 2015 FINAL DRAFT 4-12
Fire Protection 4-12
4-12
2.12.12 Occupancy L: Utility
2.12.13 Occupancy M: Miscellaneous Buildings 4-13
2.13 RELATED APPENDIX 4-13
Chapter 3 MEANS OF EGRESS 4-14
3.1 SCOPE 4-15
3.2 COMPONENTS OF MEANS OF EGRESS 4-15
3.3 GENERAL REQUIREMENTS 4-15
3.4 GENERAL PROVISIONS OF EXITS 4-16
3.5 OCCUPANT LOAD 4-16
3.5.1 Design Occupant Load 4-16
3.5.2 Fixed Seats 4-16
3.5.3 Maximum Occupant Load 4-17
3.5.4 Mezzanine Floors 4-17
3.5.5 Roofs 4-18
3.6 CAPACITY OF EXIT COMPONENTS 4-19
3.7 CORRIDORS AND PASSAGEWAYS 4-20
3.8 ASSEMBLY SEATING AND WAITING 4-24
3.9 DOORWAYS 4-24
3.10 STAIRWAYS 4-25
3.11 RAMPS 4-25
3.12 HORIZONTAL EXITS 4-26
3.13 SMOKE PROOF ENCLOSURE 4-26
3.14 NUMBER OF EXITS
3.15 TRAVEL PATH 4-29
3.16 MEANS OF EXIT SIGNS AND ILLUMINATION 4-29
Chapter 4 EQUIPMENT AND IN-BUILT FACILITIES STANDARDS 4-29
4.1. SCOPE 4-29
4.2. FIXED TYPE FIRE HYDRANT SYSTEM 4-32
4.2.1 Water Quantity for Fire Protection 4-35
4.2.2 Water Sources for Fire Protection 4-35
4.2.3 Design Considerations for Standpipe and Hose System 4-36
4.2.4 Wet Riser 4-36
4.2.5 Down Comer 4-36
4.2.6 High Velocity Water Spraying Projector System 4-36
4.2.7 Water Mist Technology
4.2.8 Drenchers Vol. 1
4.2.9 Dry Riser System
2-ii
BNBC 2015 FINAL DRAFTPart 4 4-36
Fire Protection 4-36
4-37
4.2.10 Design Consideration of Sprinkler System 4-38
4.2.11 Connection 4-38
4.2.12 Inspection, Testing and Maintenance 4-40
4.3. FIXED INSTALLATION OTHER THAN WATER 4-40
4.3.1 Centrally Fixed Installation Discharging Extinguishing Agent other than Water 4-41
4.3.2 Localized Fixed 4-41
4.4. PORTABLE FIRE EXTINGUISHER 4-41
4.5. RATE OF WATER FLOW FOR FIRE PROTECTION IN TALL BUILDING 4-42
4.6. FIRE DETECTION AND ALARM SYSTEM 4-44
4.6.1 Fire Detection shall be done by the Following Ways
4.6.2 Fire Alarm System 4-45
4.7 RELATED APPENDIX 4-47
Chapter 5 REQUIREMENTS FOR FIRE DETECTION AND EXTINGUISHING SYSTEM 4-48
5.1 SCOPE 4-48
5.2 Specific recommendations applicable for buildings complied with the followings: 4-48
5.3 OCCUPANCY A: RESIDENTIAL 4-48
5.3.1 Occupancy A1 and A2: Single Family Dwelling and Two Families Dwelling: 4-48
5.3.2 Occupancy A3: Flats and Apartments: 4-49
5.3.3 Occupancy A4: Mess, Boarding House and Hostels: 4-49
5.3.4 Occupancy A5: Hotels and Lodging Houses: 4-49
5.4 OCCUPANCY B: EDUCATIONAL 4-49
5.5 OCCUPANCY C: INSTITUTION FOR CARE
5.5.1 Occupancy C1: Institution for Care of Children: 4-49
5.5.2 Occupancy C2: Custodial Institution for the Physically Capable Adults: 4-49
5.5.3 Occupancy C3,C4,C5: Custodial Institution for the Physically Incapable, Penal and 4-49
4-49
Mental Institutions for Children and Penal and Mental Institutions for Adults: 4-50
5.6 OCCUPANCY D: HEALTH CARE FACILITIES 4-50
4-50
5.6.1 Occupancy D1: Normal Medical Facilities: 4-50
5.6.2 Occupancy D2: Emergency Medical Facilities: 4-51
5.7 OCCUPANCY E: BUSINESS 4-51
5.8 OCCUPANCY F: MERCANTILE 4-51
5.8.1 Occupancy F2: Large Shops and Markets 4-51
5.8.2 Occupancy F3: Petrol and CNG stations
5.8.3 Occupancy E3: Essential Services
5.9 OCCUPANCY G: INDUSTRIAL
5.9.1 Occupancy G1: Low Hazard Industries
5.9.2 Occupancy G2:
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Fire Protection 4-52
4-52
5.10 OCCUPANCY H: STORAGE 4-52
5.10.1 Occupancy H1: Low Fire Risk Storage 4-52
5.10.2 Occupancy H2: Moderate Fire Risk Storage 4-52
4-52
5.11 OCCUPANCY I: ASSEMBLY 4-53
5.11.1 Occupancy I1: Large Assembly with Fixed Seats 4-53
5.11.2 Occupancy I2: Small Assembly with Fixed Seats 4-53
5.11.3 Occupancy I3: Large Assembly without Fixed Seats 4-53
5.11.4 Occupancy I4: Small Assembly without Fixed Seats 4-53
5.11.5 Occupancy I5: Sports Facilities 4-53
5.12 OCCUPANCY J: HAZARDOUS 4-55
5.13 OCCUPANCY K: GARAGES 4-63
5.14 OCCUPANCY L: UTILITIES 4-67
5.15 OCCUPANCY M: MISCELLANEOUS
APPENDICES
Appendix A Fire Drill and Evacuation Procedure
Appendix B Fire Protection Considerations for Venting in Industrial and Storage Buildings
Appendix C Selection and Sitting of Fire Detection System
BNBC 2015 FINAL DRAFT
2-iv Vol. 1
Chapter 1
GENERAL PROVISIONS
1.1 SCOPE
This Part of the Code prescribes regulations for safeguarding life and property in the use or occupancy of
buildings or premises from the hazards of smoke and fire, and explosions. The provisions of this Part include
general requirements of fire protection, precautionary requirements, means of egress, equipment and in-built
facilities standard installations required for firefighting, and firefighting arrangements required for various
occupancy groups
1.2 TERMINOLOGY BNBC 2015 FINAL DRAFT
This Section provides an alphabetical list of the terms used in and applicable to this Part of the Code. In case of
any conflict or contradiction between a definition given in this Section and that in Part 1, the meaning specified
in this Part shall govern for interpretation of the provisions of this Part.
ALARM CONTROL It consists of a circuit, controls, relays, switches and associated system which receive
UNIT signals from alarm initiating devices and transmit to alarm signalling devices
ALARM INITIATING
DEVICE An equipment operated manually or automatically which, when activated, initiates an
ALARM SIGNAL alarm through an alarm signalling device.
ALARM SIGNAL Signals of audible or visual in nature, indicating the existence of a fire and/or smoke
DEVICE condition. Audible devices may be bells, horns, chimes, speakers or similar devices.
ALARM SYSTEM Visual Alarms is a strobe light emitting bright white light with approved insanity.
ALARM ZONE The equipment that produces the alarm signal.
ANNUNCIATOR
It is a combination of compatible devices, which when activated with necessary
AUTOMATIC FIRE electrical energy can produce an alarm in the event of fire.
DETECTING AND
ALARM SYSTEM It describes a defined area of the building or buildings for alarm initiating locations.
AUTOMATIC Equipment capable of indicating the zone or area of a building from which an alarm
SPRINKLER SYSTEM has been initiated or the location of such devices and the operational condition of
alarm circuit of the system.
AUTOMATIC HIGH
VELOCITY WATER These include all types of fire detecting and alarm signalling devices which activate
SPRAY SYSTEM themselves during a fire without manual intervention. The equipment/devices include
BUILDING temperature sensitive fuses, thermostat, fluid filled tubes and electronic devices which
can detect a fire and transmit automatic alarm signals.
The system consists of an array of pipe-works fitted with fusible solder or glass bulb.
This system shall activate at a predetermined temperature and the required water
shall be fed to the system from any source. In the event of fire or smoke the system
shall activate automatically by sensing the temperature of fire and discharge water to
extinguish. These devices also actuate an audible alarm automatically.
This system applies water in the form of a conical spray consisting of droplets of water
discharged at high velocity through specially designed projectors to extinguish fire by
emulsification, cooling and smothering.
Any structure used or intended for supporting or sheltering any use or occupancy.
Part 4 4-1
Fire Protection
Part 4
Fire Protection
BUILDING, EXISTING A building erected or officially authorized prior to the effective date of the adoption of
this edition of the Code by the agency of jurisdiction.
CARBON DIOXIDE This installation consists of a group of one or more cylinders of carbon dioxide,
EXTINGUISHING interconnected by a manifold and feeding into a system of high pressure distribution
SYSTEM pipe work fitted with special discharge nozzles.
COMBUSTIBLE Any material which burns and enhances the magnitude of fire.
MATERIAL
DRY-CHEMICAL This system consists of specially designed pipe works and discharge nozzles linked to
EXTINGUISHING the dry powder containers and gaseous cylinders which are automatically/ manually
SYSTEM operated in case of fire.
DRY RISER A riser or standpipe system is normally kept empty of water, but is capable to
discharge water within 45 seconds and its installation is equivalent to wet-riser system.
ELEVATOR A system, including a vertical series of elevator lobbies and associated elevator lobby
EVACUATION doors, an elevator shaft(s), and a machine room(s), that provides protection from fire
SYSTEM effects for elevator passengers, people waiting to use elevators, and elevator
equipment so that elevators can be used safely for egress.
ELEVATOR LOBBY A space from which people directly enter an elevator car(s) and to which people
directly leave an elevator car(s).
BNBC 2015 FINAL DRAFT
EXTERIOR A stairway in which at least one side have openings more than 50% in an Exterior wall
STAIRWAY in such a way that there shall be no accumulation of smoke during fire.
FIRE BARRIER A fire-resistance-rated wall inside a building, designed to restrict the spread of smoke
and fire. Opening in that wall, shall be protected by fire protected doors or windows.
FIRE A space within a building that is enclosed by fire barriers on all sides, including the top
COMPARTMENT and the bottom to limit the transfer of fire.
FIRE DAMPER A device installed in air ducts or air transfer openings or any openings designed to
close automatically upon detection of fire or smoke.
FIRE DOOR See Fire door assembly
FIRE DOOR Any combination of door leaf, frame, hardware and all other accessories that together
ASSEMBLY provide a specific degree of fire and smoke protection to the opening where it is placed.
FIRE RESISTANCE It expressed as a period of time and denotes the property of a building construction
RATING material or elements and/or construction as a whole during which the materials or
elements or constructions are (a) resistant to collapse due to fire, (b) resistant to flame
penetration and (c) resistant to excessive temperature rise to the unexposed surface.
FIRE SEPARATION Refers to a fire-resistance-wall or slab between two buildings or two spaces to protect
spread of smokes or fire vertically and horizontally.
FIRE TOWER Refers to a stairway open or enclosed, detached and isolated from any building by a
distance and can be approached from various floors of a building or buildings by
connecting passage only.
FLOOR AREA, GROSS The floor area within the inside perimeter of the outside or exterior walls of the
building under consideration with no deduction for hallways, stairs, closets, thickness
of interior walls, columns, or other features.
FLOOR AREA, NET The floor area within the inside perimeter of the outside or exterior walls of the
building under consideration with deduction for hallways, stairs, closets, thickness of
interior walls, columns, or other features or spaces not used for human occupancy.
FOAM This system discharge foam to extinguish special fires.
EXTINGUISHING
SYSTEM
HORIZONTAL EXIT Crossing a fire barrier of a building or connecting building in the same level shall be
treated as horizontal exit.
4-2 Vol. 1
General Provisions Chapter 1
INTERIOR STAIRWAY A designated area on ground or on water or on a portion of a building for helicopter
landing or takeoff without servicing, repairing and refueling facilities.
INTERIOR STAIRWAY A stairway within a building envelope.
PARTY WALL A fire resistance rated wall where openings are protected, which is constructed from
the ground level and continued up to at least 1m above the roof of a building to
restrict the spread of a fire.
PUBLIC WAY A Street, alley, or other similar parcel of land essentially open to the outside air
deeded, dedicated, or otherwise permanently appropriated for building users or for
public use or a single loaded corridor that is one lateral side opened to outer air,
designed in such a way that there shall be no accumulation of smoke in case of fire.
This corridor may be placed at any level of a building having a clear width and height of
not less than 3 meter having guards and connected to the exit termination or refuge
areas by exterior or enclosed stairs shall be treated as public way.
ROOF REFUGE AREA When occupants are relocated at the flat roof of a building which are not connected
with any means of exit shall be treated as isolated refuge area and must have
provisions for placing of leaders of fire department excess vehicles.
SMOKE DETECTOR A devise capable of sensing visible or invisible particles produced during combustion.
BNBC 2015 FINAL DRAFT
TRAVEL DISTANCE Straight line distance between the remotest point of a space of a floor and the exit
access door placed thereof.
TRAVEL PATH Length of a passage from the remotest point of a space up to the exit access door
placed thereof.
VENTILATION Natural or mechanical intake of fresh air from outside and removal of inside air of an
enclosed space.
VESTIBULE A compartment provided with two or more doors with smoke lock system where the
intended purpose is to prevent continuous and unobstructed passage by allowing the
release of only one door at a time.
VENT, FIRE A system which activates itself automatically or manually during a fire or can be
activated manually to release the heat and smoke generated by the fire and smoke.
RAMP A walking surface that has a slope steeper than 1 in 20 and accessible ramps are not
steeper than 1 in 12.
WET-CHEMICAL A system where a solution of water and potassium carbonate and/or potassium
EXTINGUISHING acetate based chemical forms the extinguishing agent.
SYSTEM
WET RISER STAND A vertical pipe or consists of an array of pipes installed vertically in a building having
PIPE SYSTEM landing valves with appropriate outlets at various levels of a building containing
charged water at a specified pressure for fire extinguishing purposes.
1.3 GENERAL REQUIREMENTS
The provisions of this Section shall specify the general requirements in respect of height and area limitations,
open space requirements and access facilities for the fire service, which are to be provided for a building to
protect it from potential fire hazards.
1.3.1 Height and Area Limitations
The height and area limitations of all buildings and structures shall be governed by the occupancy group
classification, floor area ratio and type of construction, which are specified in Part 3 of this Code.
1.3.2 Open Space or Fire Separation Requirement
For the purpose of applying the provisions of open space or fire separation requirements of a building at its side,
rear and frontages in Part 3 of this Code shall be followed.
Bangladesh National Building Code 2015 4-3
Part 4
Fire Protection
1.3.3 Access Facilities for Fire Service
The access facilities for fire service vehicles and engines shall meet provisions provided in Part 3 of this Code.
1.4 FIRE DRILL
Fire drills based on fire order shall be arranged to train the occupants of a building in first-aid firefighting,
relocation and orderly evacuation. The occupants shall be made thoroughly conversant with fire order,
firefighting, and relocation and evacuation procedures in the event of an emergency. The guidelines of fire drill,
relocation and evacuation procedure are given in Appendix A.
1.5 FIRE TESTS AND FIRE RESISTANCE RATING
The fire resistance rating of individual building construction components shall be determined by standard
materials testing procedure as detailed below.
(a) The fire resistance ratings of building assemblies and structural elements shall be determined in
accordance with ASTM E 119.
(b) The construction materials which are intended to be classified as non-combustible shall be tested in
accordance with ASTM E 136.
(c) Flame resistance rating of all materials used for interior finish and trim shall be tested in accordance
with ASTM E 84.
(d) The fire door assemblies shall conform to the test requirements of ASTM E 152.
(e) The fire windows and fire shutters shall meet the test requirements of ASTM E 163.
(f) The fire resistances rating of structural elements, which are widely used in Bangladesh, are provided in
Table 4.1.1 below, as a guideline. These ratings shall be used unless tests conducted in accordance with
the above to indicate higher fire resistance ratings, in which case the higher values may be used.
BNBC 2015 FINAL DRAFT
Table 4.1.1: Fire Resistance Rating of Common Construction Elements
Structural Element Fire Resistance Rating
SOLID CLAY BRICK WALLS
Thickness: 75 mm 0.75 hours
125 mm 1.50 hours
250 mm 5.00 hours
RC WALLS 3.00 hours
Thickness: 150 mm 4.00 hours
5.00 hours
200 mm 6.00 hours
250 mm
300 mm
RC SLABS 1.00 hours
Thickness: 100 mm with 13 mm clear cover 2.50 hours
3.75 hours
150 mm with 19 mm clear cover 5.00 hours
200 mm with 19 mm clear cover
250 mm with 25 mm clear cover
RC COLUMNS (1:2:4) 3.00 hours
250 mm x 250 mm with 25 mm clear cover 4.00 hours
300 mm x 300 mm with 25 mm clear cover 6.00 hours
400 mm x 400 mm with 25 mm clear cover 8.00 hours
400 mm x 400 mm with 50 mm clear cover
1.6 RELATED APPENDIX
Appendix A Fire Drill and Evacuation Procedure
4-4 Vol. 1
Chapter 2
PRECAUTIONARY REQUIREMENTS
2.1 OCCUPANCY CLASSIFICATION
All buildings shall be classified according to their use or by considering the character of their occupancy. For the
purpose of this Code, the occupancy classification groups shall be as follows:
Occupancy A: BNBC 2015 FINAL DRAFTResidential
Occupancy B: Educational
Occupancy C: Institution for care
Occupancy D: Health Care
Occupancy E: Business
Occupancy F: Mercantile
Occupancy G: Industrial
Occupancy H: Storage
Occupancy I: Assembly
Occupancy J: Hazardous
Occupancy K: Garages
Occupancy L: Utilities
Occupancy M: Miscellaneous
The details of occupancy classification of buildings are provided in Part 3 of this Code.
2.2 CLASSIFICATION OF CONSTRUCTION TYPES
For the purpose of this Code, every room or control area or space of a building or a building itself hereafter
altered or erected shall be classified in one specific type of construction as grouped as follows:
GROUP I- Non-combustible, subdivided as follows:
Type- I A 4 hour protected
Type- I B 3 hour protected
Type- I C 2 hour protected
Type- I D 1 hour protected
Type- I E Unprotected
GROUP II- Combustible, subdivided as follows:
Type- II A Heavy timber
Type- II B Protected wood joist
Type- II C Unprotected wood joist
Type- II D Protected wood frame
Type- II E Unprotected wood frame
The types of construction are based on fire resistance of construction elements, which are detailed in Part 3 of
this Code.
Part 4 4-5
Fire Protection
BNBC 2015 FINAL DRAFTPart 4
Fire Protection
2.3 FIRE ZONES
The development areas of a city, township or municipality or union shall be divided into Fire zones as distinct
areas based on the inherent fire hazards of the buildings to be constructed and the degree of safety desired for
the occupancy group accommodated therein.
2.4 MIXED OR SEPARATED OR DETACHED OCCUPANCY
Where two or more occupancy types are amalgamated in a floor or in a building shall be designated as mixed
occupancy shall be allowed as per provisions of A-Z list of Part 3 and this Code.
Where two or more occupancy types are in groups in a floor or in a building and separated as specified in the
Table 3.2.1 of Part 3 and as per provisions of this Code shall be designated as separated Occupancy.
Hazardous occupancy J shall not be allowed as mixed or separated occupancy with any other occupancy
classification as per provisions of this Code.
Building structures are isolated by fire separation distances as per provision of this Code shall be designated as
detached occupancies.
2.5 OPENINGS IN SEPARATION WALL
Opening means a hole or an aperture in the building envelope or in any wall within the building through which
air can pass. Protective type opening means a hole or an aperture shall have open able closures with fire
resistive assemblies to restrict air movement.
Separation wall not constructed monolithically or homogeneously and having joints shall be complied with
requirements of smoke lock and fire resistance rating as per provisions of this Code.
Vertical solid elements which create a barrier within a space or create a building envelope shall be designated as
wall or partitions as per provisions of this Code.
(a) The openings in occupancy separation wall shall conform to the provisions set forth in the Part 3 of this
Code.
(b) Openings in fire separating walls and floors shall not exceed the approved limit and the opening shall be
of protective type and conform to the approved provisions of this Code.
(c) Fire separation walls shall not have opening exceeding 11.2 m2 in area and the aggregate width of all
openings at any floor level shall not exceed 25 percent of the length of the wall. When an entire storey
floor area has fire separation walls on two opposite sides have openings shall be covered by automatic
fire suppression system, the maximum allowable opening may be doubled with a minimum distance of
0.9 m between adjacent openings.
(d) Each protected openings in a fire separation wall shall be limited to 5.6 m2 in area with a maximum
height of 2.75 m and width of 2.20 m. Wall or floor openings shall be protected with approved fire
resisting means conforming to approve standards as per provision of this Code. When openings in floors
have protected enclosures or have enclosure walls which form a shaft and have openings on enclosure
wall shall be protected by fire assemblies.
(e) Openings of service lines like cables, electrical wirings, telephone cables, plumbing fixture etc. shall be
protected by enclosures having an approved fire resistance rating. Medium or low voltage electrical
wire running through shaft or ducts shall be either armoured or cased within metal conduits as per
provisions of Part 8 of this Code.
(f) All openings in the fire separation walls shall be protected with fire resistance assemblies or automatic
fire suppression system as per provisions of this Code.
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Precautionary Requirements Chapter 2
2.6 SMOKE AND HEAT VENTS
Interior or indoor air qualities are maintained as good as natural outdoor air qualities as per provisions of this
Code through openings in the building envelope shall be designated as Natural Ventilation.
Interior or indoor air qualities are maintained by the means of mechanical devices shall be designated as
Mechanical Ventilation. Restricted ventilation means excessive smoke accumulation within a building during
fire.
(a) Smoke and heat vents shall be installed in areas of restricted ventilation such as windowless buildings,
underground structures, and factories floor spaces of restricted ventilation.
(b) Where exit access travel distance is more than 23 m, smoke and heat vents shall be constructed in
accordance with the provisions of this Code.
(c) The vent area and spacing of the vents shall comply with Table 4.2.1.
(d) Closures of natural draft, smoke and heat vents shall be installed in such a way that fire service
personnel can open it easily during a fire.
(e) Smoke and heat vents on roof or ceiling or wall shall normally be kept open. In case of closed vents,
automatic activation of the openings by heat responsive device rated at 38o C to 104o C above ambient
shall be a requirement. The releasing mechanism shall be capable of opening the vent fully when the
vent is exposed to a time-temperature gradient that reaches an air temperature of 260o C within 5
minutes. The vents shall also be capable of being opened by manual operation.
BNBC 2015 FINAL DRAFT
(f) Fire Vents requirements for Industrial and Storage Buildings are given in Appendix B of Part 4.
Table 4.2.1: Smoke and Heat Vent Size and Spacing
Use group Hazard Condition Vent Area to Floor Max Spacing of
Area Ratio Vent Centres
Occupancy H1 Low Hazard 1:150 45 m
36 m
Occupancy H2 Moderate Hazard 1:100 22.5 m to 30 m
22.5 m to 30 m
Occupancy J1 High Hazard 1:30 to 1:50 45 m
Occupancy J2, J3, J4 High Hazard 1:30 to 1:50
Occupancy K1, K3 Low Hazard 1:150
2.7 ELECTRICAL, GAS AND HVAC SERVICES
The requirements of the electrical, HVAC and gas services shall meet the provisions of Part 8 of this Code.
(a) Air-conditioning and ventilation systems shall be installed and maintained as per provisions of this Code
so that the fire, fumes or smoke do not spread from one area of fire to other area of a building through
the ducts or vents.
(b) Properly designed fire dampers shall be installed within the air-conditioning and ventilation ducts,
which shall automatically close the flow of air in case of fire.
(c) For large assembly areas, department stores and hotels with more than 100 rooms in a single block,
effective means for preventing circulation of smoke through the air-conditioning ducts shall be
installed. Such means shall consist of approved smoke sensing control devices, where fuses of dampers
may not function during early state of a fire due to insufficient heat as per provisions of this Code.
2.8 SURFACE FINISHES
Materials used to trim or cover the interior and the exterior surfaces of a building have the potential of
generating smoke and toxic fumes during a fire and have the potentiality of changing the nature of fire due to its
ignitability as fuel. Use of such finish materials shall be classified as per provisions of this Code.
Bangladesh National Building Code 2015 4-7
Part 4
Fire Protection
(a) The fire susceptibility of various types of surface finishes shall be determined in terms of the rate of
spread of fire (ASTM E 84). Based on the rate of spread of fire, the surface finish materials shall be
classified into three (3) classes:
Class I Surfaces of low flame spread: Flame does not effectively spread more than 300 mm in the first
1.5 minutes with an ultimate value of 600 mm.
Class II Surfaces of medium flame spread: Flame does not spread effectively more than 300 mm and
850 mm in the first 1.5 minutes and 10 minutes respectively.
Class III Surfaces of rapid flame spread: Flame spreads effectively more than 300 mm and 850 mm in
the first 1.5 minutes and 10 minutes respectively.
(b) Interior finish of walls and ceilings shall have a flame spread rating not greater than those in Table 4.2.2
for various occupancy classes.
Table 4.2.2: Acceptable Flame Spread Rating Classes of Interior Finish
Occupancy Class/Use Group Vertical Exits and Corridors Providing Rooms or Enclosed
Passage Ways Exit Access Areas
A1 Detached single family dwelling III III III
BNBC 2015 FINAL DRAFT
A2 Two family dwelling I I II
A3 Flats or Apartment III
A5 Hotels and Lodging Housing III
B Educational III
C1, C2 Institutional, Residential & custodial I I III
C3 Institutional-Incapacitated III
C4 Institutional- Restrained III
D Health Care III
E Business I II II
F Mercantile I II II
G Industrial I II II
H Storage III II III
I1 Large assembly with fixed seats I I I
I2 Small assembly with fixed seats I I I
I3 Large assembly without fixed seats I I I
I4 Small assembly without fixed seats I I I
J Hazardous I II III
Note: Class III may be adopted Instead of Class II where the area is covered by automatic fire suppression system.
2.9 GLAZING ASSEMBLIES
(a) Buildings of construction shall use any one of the following types of glazing using wire glass by electro-
copper or equivalent. Building of construction types as designated as unprotected or combustible may use
hardwood sashes or frames or both.
(b) Glazing system used partially or as a whole to fulfill fire separations or fire barriers requirements as per
provisions of this Code shall be the equivalent of required fire resistance rating. Glazed doors, windows or
partitions or wall with appropriate smoke lock along with other safety due to fragility, translucency or
transparency shall be correctly installed. Such fire-resistant glazing assembly must function as an integral
system together with the frame, beads, bead fixings, glazing materials and frame fixings all working
together with compatibilities with the standards installation as per provisions of this Code.
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Precautionary Requirements Chapter 2
(c) Wired glass panels shall comply with the following requirements:
(i) Thickness of the glass shall not be less than 6 mm.
(ii) Embedded wire netting mesh in the glass shall not be more than 25 mm mesh.
(iii) The sashes or frames or both shall be entirely made up of iron or any other approved metal. The frame
shall be securely fixed into the wall (except panels of internal doors).
(iv) Setting of the panels of glass shall be achieved by rebates or grooves of not less than 6 mm
diameter/width or depth keeping due allowance for expansion. The glass shall be secured to the frame
by hard metal fastenings. Approved sealants may be used for weather proofing.
(v) Where wired glass panels are labelled as protective openings, they shall conform to the size limitations
shown in the Table 4.2.3.
Table 4.2.3: Limitations of Wired Glass Panel sizes in Protective openings
Required Fire Resistance Rating Opening Size
Max Width (m)
Max Height (m) Max Area (m2)
NP
3 hours NP NP
1 1 hour door in exterior walls NP NP NP
2 BNBC 2015 FINAL DRAFT
1 1 hour fire rating 0.85 0.25 0.065
2
3 hour fire rating 1.4 1.4 0.85
4
Fire windows 1.4 1.4 0.85
Note: Size limitations are not applicable for Fire Rated Glazing Assemblies.
NP = Not Permitted.
(d) Electro-copper glazing shall comply with the following requirements:
(i) Thickness of the glass shall not be less than 6 mm.
(ii) Not more than 0.4 m2 of square glass shall be formed by electro-copper glazing in sectional lights.
(iii) The sashes or frames or both shall be entirely made up of iron or any other approved metal. The frame
shall be securely bolted into the wall (except panels and internal doors).
(iv) Setting of the panels of glass shall be achieved by rebates or grooves of not less than 6 mm width or
depth keeping due allowance for expansion. The glass shall be secured to the frame by hard metal
fastenings. Approved sealants may be used for weather proofing.
(e) Wall opening more than 5 m2 shall not be deemed to be effectively protected by wired glass or electro-
copper glazing.
(f) Wired glass or electro-copper glazing not exceeding 0.85 m2 in area shall be allowed provided it is cased in
hard metal and secured to the frames by hard metal hinges not exceeding 60 mm apart and by fastening at
top, centre and bottom.
2.10 SKYLIGHTS
(a) Wired glasses used in skylights shall comply with the following requirements:
(i) Thickness of the glass shall not be less than 6 mm;
(ii) Wire netting mesh embedded in the glass shall not be more than 25 mm square;
(iii) The glazing shall be caged in frame of continuous metal divided by bars 750 mm apart centre to centre.
The frame and bars shall be iron or other approved metal (or of hard wood covered with sheet metal).
The glass shall be secured to the frame by hard metal fastenings. Approved sealants may be used for
weather proofing.
(b) Single opening for Skylight more than 5 m2 shall not be deemed to be effectively protected by wired glass.
Bangladesh National Building Code 2015 4-9
BNBC 2015 FINAL DRAFTPart 4
Fire Protection
2.11 FIRE LIFTS
(a) Fire lifts shall be installed as per provisions of this Code. Fire lifts, where installed shall be fully automated
from the ground level with all though fire rated and protected wiring and switches and shall have a
minimum capacity of 8 persons.
(b) Fire lifts shall be operated and maintained by the inmates of building except during fire. During fire, Firemen
shall takeover to operate such lifts.
(c) Fire lifts shall be equipped with approved two way voice communication with the fire command station or
control room or security room on the exit termination level of a building.
(d) Number and location of fire lifts in a building shall be decided on the basis of total occupant load, floor area
and compartment.
(e) A Lift shaft or bank shall be dedicated to Fire lift.
(f) The speed of the lift shall be such that it can reach the top floor from ground level (non-stop) within 1
minute.
(g) Smoke detectors shall be installed at a distance of 3m from every entry doors of Fire Lifts and links with
corresponding lift control panel to prevent lift doors to open in case of fire at any level.
(h) All lifts in tall structure shall be operable during fire. There shall be provisions for firemen to take over the
control of lift operation as per provision of this Code.
(i) All stretcher and hospital lifts shall be operable during fire. There shall be provisions for firemen to take
over the control of lift operation as per provision of this Code.
(j) Lifts installed for accessibility shall be operable during fire. There shall be provisions for firemen to take over
the control of lift operation as per provision of this Code.
(k) Lift lobby shall be connected with at least one fire stair by a means of exit component.
2.12 UTILITIES (OCCUPANCY L) AND EXEMPTED QUANTITIES OF HAZARDOUS
MATERIAL
Occupancy type L is a separated occupancy from the main occupancy classifications to provide ancillary electro-
mechanical service facilities require a special attention which shall be taken as per provision of this Code.
Utilities (Occupancy L) and exempted quantities of hazardous materials for different occupancies are given
below:
2.12.1 Occupancy A: Residential
(i) Flammable liquids used for domestic purposes shall be kept adequately sealed in approved containers
within the limit of exempted quantity at all times.
(ii) Stoves and heaters using open flame shall be so located at defined space with proper precaution.
(iii) Exhaust fans used in kitchens shall be placed on a peripheral wall of the building or to a duct connected
directly to outside and shall be made of non-combustible material. The duct shall not pass through
combustible materials.
(iv) Doors leading into a room containing flammable liquids shall be provided with self-closing devices.
Appropriate signs identifying the storage materials and requesting the users to keep the door closed shall
be marked on both sides of the door.
(v) All outdoor roof top antennas shall be protected by proper lightning arrester.
(vi) Rooms containing boiler shall be separated from the main building by appropriate separation wall with all
its openings protected as per provisions detailed in Sec 2.3 of Part 3 and Sec 2.5 of this Chapter.
(vii) Areas or rooms within the building identified as Control Area shall be protected or segregated by
appropriate separation wall or by other approved means as per the provisions of this Code.
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Precautionary Requirements Chapter 2
2.12.2 Occupancy B: EducationalBNBC 2015 FINAL DRAFT
(i) Control areas containing volatile flammable liquids shall be separated from the adjoining areas in as per
provisions of this Code.
(ii) Gas pipeline entering any building shall be equipped with shutoff valves outside the building with
conspicuous marking clearly delineating the location as per provisions of Part 8 of this Code.
(iii) The openings of boiler rooms shall be adequately protected by fixed, automatic or self-closing fire
assemblies.
2.12.3 Occupancy C: Institutional
Permit shall not be granted for storage or handling of any hazardous material even in control areas, except for
normal use in amounts not exceeding the exempted amounts specified in Chapter 2 of Part 3, in a building or
part thereof classified as Occupancy C.
2.12.4 Occupancy D: Health Care
Storage of volatile flammable liquids such as chloroform, ethyl alcohol, mentholated spirit etc. shall be stored in
Control Areas and no unauthorized person shall be allowed to handle such liquids.
2.12.5 Occupancy E: Business
(i) Exit aisles or approaches in self-service in a space shall not be obstructed by placing checkout stand with
associated railings or barriers on its passage.
(ii) All operations in open air markets, refuelling stations, road side stands for sale of farm products etc. shall be
so conducted that unobstructed access to exits are always maintained.
2.12.6 Occupancy F: Mercantile
Provisions are same as those of Sec 2.12.5 (Occupancy E).
2.12.7 Occupancy G: Industrial
(i) Apparatus are not capable to igniting flammable vapour shall be permitted within a control area of a
building using or processing or storing volatile flammable liquid. Control Areas of a building using or
processing or storing such flammable liquid shall be covered by exhaust ventilation system.
(ii) Boiler rooms and areas containing heating plants shall be separated from the rest of the occupancy as per
provisions of this Code.
(iii) Adequate protective measures shall be taken against hazards associated with distribution and use of
electricity and gas in accordance with the provisions of Chapters 2 and 8 of Part 8.
(iv) The machine layout shall be congenial to safe fire practice.
2.12.8 Occupancy H: Storage
(i) Apparatus are not capable to igniting flammable vapour shall be permitted within a Control area or part of a
building using or storing volatile flammable liquid. Control Areas of a building using or storing such
flammable liquid shall be covered by exhaust ventilation system.
(ii) Boiler rooms and areas containing heating plants shall be effectively segregated from the main occupancy.
(iii) Adequate protection shall be taken against hazards associated with distribution and use of electricity and
gas in accordance with the provisions of Chapters 2 and 8 of Part 8.
2.12.9 Occupancy I: Assembly
(i) All materials used for decorative purposes in buildings of Occupancy I shall be non-combustible. If fabrics
and papers are used for decorative purposes, shall be treated with flame resistant chemicals/materials.
(ii) Rooms and parts of a building containing high pressure boilers, refrigerating machinery, large transformer
or other service equipment having explosion potential shall not be located on or adjacent to the defined
Bangladesh National Building Code 2015 4-11
BNBC 2015 FINAL DRAFTPart 4
Fire Protection
exit route. Such rooms shall be effectively cut off from the rest of the building and connected to open air
through approved ducts or openings.
(iii) Rooms or parts of a building used for storage of combustible materials such as paints or other items shall be
effectively cut off from main assembly building or protected by approved automatic sprinkler system. Such
areas shall be away from staircases.
(iv) Legitimate stages having such facilities as fly galleries, gridirons and rigging shall be covered by an automatic
sprinkler system above and below such stage areas or spaces. Auxiliary spaces such as dressing rooms, store
rooms, and workshops and the proscenium opening shall be effectively covered by fire resistant curtains
capable of withstanding a lateral pressure of 4 kN/m2. The curtain shall be equipped with self-closing
emergency device and when closed shall be tight enough to prevent spread of smoke.
(v) Legitimate stage roof above every theatre using movable scenery or motion picture screen constructed of
highly combustible materials shall be fitted with ventilators in or above it. The ventilators shall be operable
from the stage floor manually or by fusible links or some approved automatic heat actuated device to give
an opening to sky with an area of one-eighth the area of the stage.
(vi) In theatres not protected by automatic fire sprinklers, the proscenium wall using movable scenery of
decorations shall be provided with maximum of two openings to enter the stage and each opening shall not
be of more than 2 m2.
(vii) Film projection apparatus shall be enclosed within fire resistant enclosures.
(viii) Auditoriums of theatres and cinemas shall be installed with vents on roof having vent area equal to the
floor area including balconies and galleries, boxes and tiers. Larger numbers of smaller vents shall be
preferable over smaller number of larger vents.
2.12.10 Occupancy J: Hazardous
(i) Equipment and machinery in operations, igniting and/or emitting combustible volatile substances shall be
installed in a standard environment as recommended in NFPA or equivalent standards.
(ii) Rooms containing boiler or heating plant shall be effectively separated from the main occupancy.
2.12.11 Occupancy K: Garage
As per safety requirement of NFPA or equivalent standard.
2.12.12 Occupancy L: Utility
As per safety requirement of NFPA or equivalent standard.
2.12.13 Occupancy M: Miscellaneous Buildings
As per safety requirement of NFPA or equivalent standard.
2.13 RELATED APPENDIX
Appendix B Fire Protection Considerations for Venting in Industrial and Storage Building
4-12 Vol. 1
Chapter 3
MEANS OF EGRESS
3.1 SCOPE BNBC 2015 FINAL DRAFT
The provisions of this Section shall control the design, construction and arrangement of building components to
provide a reasonably safe means of egress. Any repair or alteration works within a building shall be prohibited
unless the existing means of egress and fire protection system are continuously maintained or a continuous
alternative exits and protection measures are taken to provide an equivalent degree of safety for the occupant
and the workers for the total duration of such project.
3.2 COMPONENTS OF MEANS OF EGRESS
3.2.1 A means of egress is an evacuation system with the provisions of reentry for rescuers and fire fighters
where a continuous and unobstructed way of exit travel shall be provided from any point within a building to a
designated area of refuge for allowable delayed evacuation and ended up with the exit termination by reaching
a street abutting building or plot or an safe area which is open to air and designated assemblies for evacuees.
The way of exit travel within a building form any point thereof along a means of egress shall consist of three
parts: (1) the exit access, (2) the exit, and (3) the exit discharge
(a) A way or path of evacuation from any point of an area affected due to fire incident leads to a protected
entry to another separated area of a building shall be termed as exit access. Straight line distance between
the remotest point of an area of incident and the entrance point of a separated area shall be measured and
termed as a travel distance.
(b) The exit is a component or a group of components start with a protected opening to evacuate an area of
fire incidence and provides a safe entry to a separated area which is component of means of egress and
subsequently leads to the exit discharge.
(c) The outer edges or peripheral points of a building from where occupants shall evacuate the building
envelope termed as Exit discharges which shall lead evacuees to the terminal points at a safe distance from
thereof.
An area or any plot abutting street which is open to air and designated for systematic assemblies of evacuees to
complete the process of egress system shall be termed as exit termination.
3.2.2 The parts of the means of egress consist of any of the following exit components:
(a) A doorway, separated or refuge area like smoke and fire proof enclosure, compartment, corridor, passage,
ramp, balcony, an exterior or open or interior fire stair, or any combination of these, leads orderly to the
exit discharge which offer safety from fire or smoke from the area of incidence.
(b) Horizontal exit shall provide a delayed egress by relocating the occupants from their initial location due to a
fire incident to a separated area at same level of a same building or at the same level of adjoining or
detached buildings connected through a fire door or a vestibule or a passage or corridors for relocation of
evacuees. Receiving areas are capable to accommodate expected evacuees for certain time period, free
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from heat, smoke and aggressive fire, from the area of incidence and shall lead to exit discharges without
returning the evacuees to their initial locations.
3.2.3 Generally lifts, escalators and moving walks shall not be regarded as components of means of egress.
When they are designed and installed for safe operation during fire shall be included as components of means
of egress.
3.2.4 Means of Escape: A way out of a building or structure that does not conform to the formation of means
of egress but does provide a safe way out.
3.3 GENERAL REQUIREMENTS
3.3.1 Design considerations or assumptions:
(a) Fire initiated from only one source in single space shall aggravate within a building or adjacent structures
over a time period.
(b) More than one space or source of fire at the same time shall not be considered.
(c) All Construction Materials by qualities and quantities including surface finish, utilities, fabrications of
movables and immovable, stored materials shall be approved types as per provisions of this Code.
(d) Stability of structural elements or building itself shall be as per provisions of this Code.
(e) Occupants, Rescuers and fire fighters life safety shall be the prime consideration thus egress system
including relocation and fight in place or evacuation and reentry provisions shall be as per provisions of this
Code.
(f) Fire suppression and extinguishment arrangement for life safety and minimize property damages shall be
performance based as per provisions of this Code.
(g) Provisions of this Part shall be the minimum standard, in excess of these provisions shall not be prevented
to design a egress system or to install advance and higher standard of detection and extinguishment
equipment or both which shall be approved by the authorities having jurisdiction.
3.3.2 All buildings constructed for human occupancy or control areas or storages shall be provided with
adequate exit facilities to permit safe and quick unaided egress of the occupants in the event of fire or other
emergency.
3.3.3 Exits shall not be used for any other purpose at any time that would obstruct the intended use of those
components during emergency.
3.3.4 Where corridors or passages are components of exits shall not be designed or used as components to
supply or return air.
3.3.5 Preferences of levels of walking surfaces in the means of egress shall be more than 1 in 20. Ramps or
stairway shall be used in case of changes in elevations of walking surfaces. Fire Zone 1
(a) Abrupt changes not exceeding 130 mm but exceeding 60 mm shall be beveled 1 in 2.
(b) Changes in elevation exceeding 130 mm shall be considered as a change in level.
(c) A stairway in walking surface of the means of egress shall consist of minimum two steps and all of them
shall be identical and shall have tread depth not less than 330 mm and height of risers shall not be exceeded
more than 230 mm but shall comply tread and riser combination as per provision of this Code.
(d) Changes in levels 530 mm or more in walking surfaces of the means of egress shall be achieved either by a
ramp or by a stairway.
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Means of Egress Chapter 3
(e) Presence and location of such steps or ramps in the walkways shall be readily apparent.BNBC 2015 FINAL DRAFT
(f) Other than ramp, a slope of walking surfaces along the direction of travel shall not be steeper than 1 in 20
and slope perpendicular to the travel direction shall not be exceeded 1 in 48.
(g) Slope of ramps shall be complied with the accessibility where required as per provisions of this Code.
3.3.6 From the exit access all exits shall be clearly visible. Corridors and passages leading to the exit discharge
shall be marked and signposted to guide the evacuees as per provisions of this Code. A space used in darkness
having more than one exits shall be illuminated exits sign as per provision of this Code.
3.3.7 The owner or lessee of all new and existing buildings shall be responsible to provide the safety
provisions for all occupants and rescuers and firefighters. If in any existing building, the exit facilities are
deemed inadequate in view of the requirements of this Code, the authority having jurisdiction may order to
comply with the provisions of this Code.
3.4 GENERAL PROVISIONS OF EXITS
3.4.1 All exits shall be easily discernible and accessible from the areas served by them.
3.4.2 Exit from any room or space shall not open into an adjoining or intervening room or area except where
such adjoining room or area is an accessory to the area served, is not a hazardous occupancy. If hazardous or a
control area, provide a direct exit to the outside of a building envelope or directly connect with the components
of egress system.
3.4.3 No portion of Exits shall pass through a room that may be subject to lock with detachable key or be
intervened by a door that may have detachable key operated lock and the door is locked when the building is
occupied.
3.4.4 All entry points to the assembly occupancy shall serve as Exits and shall have the total capacity for at
least one-half of the total occupant load. Provisions of exits other than entries shall have capacity to evacuate at
least two-thirds of occupant from each level of assembly occupancy.
3.4.5 All exits shall be so located and arranged that they shall provide continuous and unobstructed means of
egress up to the exit discharge.
3.5 OCCUPANT LOAD
Total occupant load means summation of all occupants of only one level at the pick hour occupancy where
maximum occupants are present.
Occupant load shall be considered as per provisions of this Code to design each and every component of means
of egress system shall be termed as design occupant load.
3.5.1 Design Occupant Load
The design occupant load for which the component of means of egress is to be provided shall be the highest
number computed as per the provisions of (a), (b) and (c) as stated below:
(a) The actual number of occupants for whom the area served by the exits is designed;
(b) Number of occupants shall be computed as prescribed in Table 4.3.1.
(c) The number of occupants in any area shall be computed as per provisions of (a) or (b) as stated above and
in all cases the higher value shall govern the design.
(d) The computation of design occupant load shall be the summation of occupants of a space and the evacuees
of other spaces whose are using the said space as for waiting or passing through in case of emergency to
gain an access to a component of means of egress.
Bangladesh National Building Code 2015 4-15
Part 4
Fire Protection
Table 4.3.1: Occupant Load Factor Unit of Floor Area in m2 per Occupant*
Occupancy 18 gross
A Residential
B Educational: 2 net
Class room 3.5 net
Preschool
C Institutional 12 gross
D Health Care: 15 gross
In patient areas 10 gross
Out-patient areas
I Assembly: Number of seats designed.
with fixed seats 0.93 net
with movable seats 0.37 net
standing space only 1.5 net
with table and chairs
Passengers that can be unloaded 0.15 net
simultaneously to a terminal or a platform
BNBC 2015 FINAL DRAFT
E Business: Office Space 3 gross
F Mercantile: 2.3 net
4.6 net
Retail sales Area, Ground floor or
Basement
All other floor
G Industrial 10 gross
H Storage 20 net
K Garages and open parking structures 23 net
L Utility Actual occupant load
M Miscellaneous Building Actual occupant load
* As per Sec 3.5.1(b) of this Chapter, design occupant load shall be calculated and any fraction shall be
rounded to next higher integer value. Width of all components of egress system shall satisfy requirements
of specified in the Table 4.3.2
3.5.2 Fixed Seats
The occupant load for an assembly or educational area having fixed seats shall be determined by the seating
capacity of the area. For fixed seats without dividing arms, the capacity shall be taken as one person for every
500 mm of seat.
3.5.3 Maximum Occupant Load
The design occupant load, need not to be calculated more than one person per 0.3 m2 of usable floor space.
3.5.4 Mezzanine Floors
The occupants of a mezzanine floor evacuating through other floors the occupant load shall be added to the
receiving floors.
3.5.5 Roofs
A Roof, an open air space used as assembly or refuge area, educational or other types of human occupancy shall
be provided with exit facilities as per provisions of this Code.
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Means of Egress Chapter 3
3.6 CAPACITY OF EXIT COMPONENTS
3.6.1 The capacity of egress components shall be complied with the occupant load of the area served. The
required width of each component shall be computed on the basis of the allotted width per occupant prescribed
in Table 4.3.2, subject to the minimum widths of such components specified in Sections 3.7 to 3.12 and the
travel distances of such components as per provision of this Code.
Table 4.3.2: Required Width per Occupant
Buildings without Sprinkler Buildings thoroughly Sprinkled (mm per
System (mm per person)
Occupancy person)
Stairways Ramps & Doors
Corridors Stairways Ramps & Doors
Corridors
A Residential
B Educational
E Business
F1, F2 Mercantile 8 54 5 44
G Industrial
H Storage
BNBC 2015 FINAL DRAFT
C1, C2 Institutional 8 54 5 54
C3, C4, C5 Institutional 10 54 8 54
D Health Care 25 18 10 15 12 10
I Assembly 75 7 55
10
F3 Mercantile
J Hazardous 8 54 8 54
K, L, M 8 54 5 44
Note: width of the components of egress shall be divided by value specified in this table to determine the maximum
allowable occupant load served by them.
3.7 CORRIDORS AND PASSAGEWAYS
3.7.1 Occupants commencing exit travel along a corridor or a passageway shall be lead to an exit discharge.
Length of dead end corridors and passageways and branches thereof shall not be exceeded as per Sec 3.15.4 of
this Chapter.
3.7.2 The required width of corridors and passageways shall be calculated on the basis of the occupant load
in accordance with the provisions of this Code and shall not be less than as per Sec 3.15.4 of this Chapter.
3.7.3 The minimum ceiling height of the corridors and passageways used as a means of egress shall not be
less than 2.4 m.
3.7.4 All exit corridors or passages shall have a fire resistance rating of 1 hour or more as per provisions of
this Code.
3.7.5 Protective opening leads to an exit shall be fire doors or fire windows or a fire assembly having a fire
resistance rating of at least 20 minutes or more as per provisions of this Code.
(a) Certified Fire resistance rating of Doors shall be in accordance with ASTM E152 without the hose stream
test.
(b) Fire resistance rating of the fire door assembly has to perform as required 20, 30, 60, 90, 180 minutes or
more shall be leveled A, B, C, D, E and F respectively.
(c) Fire door assembly of any approved materials shall qualify through ASTM E152 without the hose stream
test.
Bangladesh National Building Code 2015 4-17
Part 4
Fire Protection
3.8 ASSEMBLY SEATING AND WAITING
(a) Assembly buildings primarily meant for theatrical, operatic performances or cinematic projection shall have
the seats securely fastened to the floor with exceptions as permitted in this Code. All seats in balconies and
galleries shall be securely fastened to the floor except boxes with level floor and less than 14 seats.
(b) Seats not fixed to the floor shall be permitted in restaurants and such other places provided that 1.25 m2 of
floor space is allotted for every seat excluding dancing floor and stage. Adequate aisles shall be maintained
at all times to reach exits without obstruction when such occupancies are in use.
3.8.1 Assembly buildings which contain seats, tables, equipment or exhibitions or displays shall be provided
with aisles, free of obstructions, leading to the exit.
3.8.2 Minimum clear widths of steeped aisles and other means of egress serving assembly seating shall be
calculated on the basis of number of seats and in accordance with Table 4.3.3. Interpolation shall be permitted
between the specific values shown thereof. The minimum clear width of steeped aisles as found by above
calculation shall be modified in accordance with the conditions stated below:
(i) If risers exceed 178 mm in height for steeped aisles the width of the steeped aisles as shown in the
table shall be multiplied by factor a,
BNBC 2015 FINAL DRAFT
Where, = 1 + ℎ−178 (4.3.1)
125
(ii) In the Table 4.3.3 values of steeped aisles not having a handrail within a 760 mm horizontal distance
shall be 25 percent wider.
(iii) In Table 4.3.3 values of width of ramps used for ascending and steeper than 1 in 10 slope shall be
increased by 10 percent.
Table 4.3.3: Capacity Factors for Assembly Seating
Number of seats within a Clear Width per Seat Served
single assembly space.
Steeped aisles (mm) Passageways, Ramps
and Doorways(mm)
≤ 2.000 7.6 a 5.6
5,000 5.1 a 3.8
10,000 3.3 a 2.5
15,000 2.4 a 1.8
20,000 1.9 a 1.4
≥25,000 1.5 a 1.1
3.8.3 The minimum width of level or ramped aisles shall be as specified below:
Seats on both sides of the aisle 1.0 m
Seats on one side of the aisle 0.9 m
3.8.4 The minimum width of stepped aisles shall be as specified below:
Seats on both sides of the aisle 1.2 m
Seats on one side of the aisle 1.0 m
3.8.5 The minimum clear gap between rows, measured as the clear horizontal distance between the back of
the row ahead and the nearest projection of the row behind shall be 300 mm. For chairs having automatic or
self-rising seats, the measurement shall be made with the seats in the raised position, for non-automatic seats
the measurement shall be taken with the seats in the down position.
3.8.6 For rows of seating served by an aisle or doorway at only one end of the row, the path of travel shall
not exceed 10 m from any seat to the aisle or doorway. The minimum clear gap between rows shall be increased
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Means of Egress Chapter 3
beyond 300 mm specified in Sec 3.8.6 by 15 mm for each seat in excess of 7, but the clear gap need not exceed
550 mm.
3.8.7 In any assembly occupancy spectators are allowed to wait in the lobby or similar space within the
building until seats are available. Exits shall be provided for the waiting spaces on the basis of 0.28 m2 areas per
person waiting space and one wheel chair space for every 100 occupant. Such waiting occupant load shall be
added with main assembly load for calculating exit size for the assembly as per provisions of this Code.
3.9 DOORWAYS
One surface of a door leaf which is exposed to a fire incident is the terminal point of exit access and other
surface of that said door which is unexposed to that fire incident is the starting point of an exit. A door or an
opening protective assembly is an obstruction for occupants to pass through from exit accesses to exits until
and unless it is installed as per provisions of this Code.
3.9.1 Each occupant of a room or space shall have access to at least one exit door or exit access assembly.
The occupant load per exit door and the travel distance up to that door shall not exceed the values specified in
Table 4.3.4.
BNBC 2015 FINAL DRAFT
3.9.2 Where either the occupant load or the travel distance exceeds the values specified in Table 4.3.4 shall
have multiple exit doors to comply the both.
3.9.3 The width of a door shall not be less than 1 m and the height shall be not less than 2 m. Exit doors shall
be side swing or pivoted of side hinge type.
3.9.4 No sliding or hanging door shall be used as a means of exit. In pressurized areas and when occupant
load is less than 10, restriction of Sec 3.9.3 may be exempted.
3.9.5 All exit access doors shall be of a side-swinging type. When the occupant load exceeds 50 or in a
hazardous occupancy, the doors shall swing outward from the room or towards the direction of travel. Swinging
of the door shall not constrict the width of the corridor narrower than 0.9 m measured at the most critical
position.
3.9.6 Exit doorways shall not open directly on a flight of stairway. A clear area which more than the width of
the door leaf as specified in the above Sec 3.9.5 shall be maintained immediately outside the doorway. The floor
levels shall be same in the direction of travel as per provisions of this Code.
Table 4.3.4: Maximum Occupant Load and Travel Distance for Spaces with One Exit Door
Occupancy Maximum Design Maximum Travel
Occupant Load Distance (m)
A Residential
C Institutional 12 23
D Health Care
B Educational 50 23
I Assembly
E Business
F Mercantile
G Industrial
H Storage 30 30
J Hazardous 58
3.9.7 Revolving doors shall not be used as a means of exit in assembly, educational or institutional buildings
or in spaces with an occupant load of 200 or more. In all other cases revolving doors shall not constitute more
Bangladesh National Building Code 2015 4-19
Part 4
Fire Protection
than half of the total required exit door width and each revolving door with least diameter of 2.7 m shall be
credited not more than 50 persons. Exit doors shall be installed in the same wall within proximity of 3m of
Revolving doors and shall comply with the following:
3.9.7.1 Revolving doors shall be positioned with a dispersal area at a distance of 3m or more from the foot or
top of stairway or escalators or moving walks or lift lobbies.
3.9.7.2 Revolving doors shall stop rotating and stand still in a book-fold position at a force not more than 800 N
or when a force is applied not more than 578 N to a wing within 760 mm of outer edge or due to sudden power
failure catch automatically released and ready to manual revaluation and that provide a path which shall have
aggregate width minimum 910 mm.
3.9.7.3 A manual control switch shall be installed in an approved location.
3.9.7.4 Speed of revolving door shall not exceed the revolution per minute shown below:
Inside Diameter (m) Speed of Revolving Door Power-mode Speed limit
2 (rpm)
Manual-mode Speed limit
(rpm) 11
12
BNBC 2015 FINAL DRAFT
2.1 11 10
2.3 11 9
2.4 10 9
2.6 9 8
2.7 9 8
2.9 8 7
38 7
3.9.7.5 All exit doors shall be operable without the using a detachable key from the side they serve to
evacuate.
3.10 STAIRWAYS
Change in level in elevations achieved by steps combination of identical risers and treads as per provisions of
this Code shall be termed as Stairway irrespective of their locations. Stairways within an envelope shall be
termed as Staircase. Exception: stepped aisles with in an assembly.
Width of Stairways shall be a length perpendicular to the direction of travel, a clear distance measured between
inner edges of handrails or a clear distance between inner edges of a handrail of exposed side to its opposite
and parallel surface measured at a height of inner edge of cross section of that handrail. In case of variation in
width measurement the smallest value shall represent the width of a stairway. Required combination of
dimensions for risers and treads given in Table 4.3.5.
Required guards and handrails shall continue for the full length of each flight of stairways. Inner turns of
handrail of flights shall be at the landings and grasp ability of handrails shall be smooth and continuous, Handrail
Brackets or balusters attached to the bottom surface of handrail shall not be considered to be obstructions to
grasp ability. Gap between any surface and handrail shall be not less than 63.5 mm.
Stairways serving more than three storey building having capacity more than 10 occupants shall have visual
enclosures to avoid any impediments to stair use by persons having fear of height, any arrangement intended to
meet this requirement shall be at least 1070 mm in height.
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Means of Egress Chapter 3
3.10.1 The required width of exit stairways shall be computed in accordance with the provisions of Sec 3.6, but
it shall not be less than the minimum widths specified in Tables 4.3.6 and 4.3.7
3.10.2 The least dimension of landings or platforms in exit stairways shall not be less than the required width
of stairway and shall be leveled, except that the landing between two stair flights in a straight run shall not be
required to be wider than 1.2 m in the direction of travel.
When two stair flights are not straight or nonparallel to each other, a turning in the path of travel direction
occurred which is other than U turn. Landing width shall be the required width of stairway and length of the
common landing between such flights shall be one tread depth more lengthen when measured from both edges
of stairway from both the flights.
Table 4.3.5: Combination of Risers and Treads
Gradients Step Dimensions Available Headroom Handrail or Maximum
Clearance of Flight Guard Number of
Grade Angle of Flight Tread Depths Risers Height
(%) Deg (mins) (mm) (mm) (mm) Flights
2159 (mm)
31.25 17 21 406 127
33.87 18 43 394 133 851 6
37.28 20 27 375 140 2184
BNBC 2015 FINAL DRAFT
41.07 22 20 356 146
44.44 23 58 343 152
48.07 25 40 2210
330 159
53.06 27 57 311 165 838
57.44 29 52 2235
324 171
63.63 32 28 279 178 2261 Unlimited
69.04 34 37 267 184 2286
75 36 52 254 190 2311
81.57 39 12 241 197 2362
88.88 41 38 229 203 2388 851
216 210 2438
97.05 44 9
103.02 45 51 210 216 2464
107.07 46 57 206 222 2489 864 10
112.5 48 22 203 229 2515
Note: Allowable length of nosing at the outer edge of tread shall not be included in the tread depth measurement. The
maximum rise of a single flight between landings shall not be exceeded 3658 mm and in case of large assembly
maximum rise of a single flight between landings shall not be exceeded 2438 mm.
Table 4.3.6: Minimum Width of Stairways in Egress System
Occupancy Minimum Width of Each Stairway (mm)
A Residential: A1, A2 As per Table 4.3.6
1120
A3, A4, A5
B Educational 1120
Occupant load up to 130 2235
Occupant load more than 130 but not more 250
D Hospital 2235
Patient area 1120
Staff area
I Assembly: I1, I2, I3, I4, I5 As per provisions of this Code.
All others As per provisions of this Code.
Note: The required number of stairways shall be determined by dividing the calculated total widths of stairways as per
sections 3.5, 3.6 and Table 4.3.2 of this Chapter by applicable minimum stair width as specified in this table and any
fractions thereof shall be rounded up with the next higher integer. Unit width of stair and multiple even numbers
shall be maintained as per provisions this Code.
Bangladesh National Building Code 2015 4-21
Part 4
Fire Protection
Table 4.3.7: Fire Escape Stairs Serving More than 10 Occupants Serving 10 or Fewer Occupants
Element 560 mm between handrails
Clear widths
Minimum horizontal dimension 560 mm
of any landing or platform
Maximum riser height 230 mm
Minimum tread, exclusive of 250 mm
nosing
Tread construction Solid, 13 mm diameter perforation permitted
Winders Not permitted permitted subject to Sec 3.10.7
Spiral Not permitted permitted subject to Sec 3.10.7
Maximum height between 3.70 m
landings
Headroom, minimum 2.00 m
Access to protected openings Door or casement windows, 600 mm x Window providing a clear opening
2000 mm or double-hung windows 70 of at least 500 mm in width, 600
mm x 900 mm clear opening mm in height, and 0.53 m2 in area
BNBC 2015 FINAL DRAFT
Level of access openings Not over 300 mm above floor; steps if higher
Discharge to ground Swinging stair section permitted if approved by authority having jurisdiction
Capacity, number of person 13 mm per person if access by door; 25
mm per person if access by climbing
over window sill 10
Note: The maximum design occupant load for a Fire escape stair shall not be exceeded 50 occupants from any
floor level.
3.10.3 The rise and tread dimensions in a stairway shall be identical and the headroom requirements shall
conform to the provisions of this Code.
3.10.4 Handrails height on stair shall be not less than 860 mm and not more than 960 mm above the surface of
the tread, measured vertically from the top of the rail to the outer edge of the tread. Peripheral diameter of
circular cross section of a handrail shall not be less than 32 mm and not more than 50 mm. Any other shape with
perimeter dimension of not less than 100 mm, but not more than 160 mm and with the largest cross-sectional
dimension not more than 55 mm shall be permitted provided that all edges are rounded to provide a radius of
not less than 3 mm. Handrails shall be graspable along their entire length. Additional handrails that are lower or
higher than main shall be permitted.
3.10.5 The height of guards shall not be less than 105 mm measured vertically from the top of the guards from
the surface of adjacent area to be served by them. When blasters are used in the guards rail shall be used to
create a pattern as such size that a sphere 100 mm in diameter shall not pass through any opening up to a
height of 860 mm. Riser, tread and the bottom rail of guards formed a triangular opening shall not be of such
size that a sphere 150 mm in diameter shall not pass through.
3.10.6 There shall be no variation in excess of 5 mm in depth of adjacent treads or in the height of adjacent
risers, and the tolerance between the largest and smallest tread or between the largest and smallest riser is 10
mm in any flight.
3.10.7 Monumental stairs, Circular stairs, Curved stairs, Spirals and winders, stepped and rung ladders,
alternate tread devices shall be permitted as per provisions of this Code.
3.10.7.1 When the width of stairways exceeded 4475 mm termed as Monumental or Grand Stairway shall be
permitted as per provisions of this Code.
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3.10.7.2 Curved stairs or circular stairs shall be permitted as a component of means of egress as per provisionsBNBC 2015 FINAL DRAFT
of this Code provided that the depth of tread is not less than 280 mm at a point 300 mm from the narrower end
of the tread and the smallest radius is not less than twice of stair widths and shall comply with the provisions of
this Code.
3.10.7.3 Spiral stairways shall be permitted where occupant load shall not more than five. For spiral stairways
the following conditions shall be applicable:
(a) The clear width of the stairs shall not be less than 660 mm.
(b) The height of risers shall not exceed 240 mm.
(c) Headroom shall be not less than 1980 mm.
(d) Treads shall have a depth not less than 190 mm at a point 300 mm from the narrower edge.
(e) All treads shall be identical.
3.10.7.4 Winders shall be permitted in stairs where occupant load shall not be more than three.
(a) Winders shall have a tread depth not less than 150 mm and a tread depth not less than 280 mm at a point
300 mm from the narrowest edge.
(b) The clear width of the stairs shall not be less than 660 mm.
3.10.7.5 Stepped ladders and Rung ladders shall be installed with pitch that exceeds 75 degrees as per
standards of ANSI A14.3. The lowest rung of any ladder shall not be more than 300 mm above the level of the
surface beneath it.
(a) From towers and elevated platforms around machinery or similar spaces subject to occupancy load not to
exceed three persons.
(b) Open structure, observation towers or railroad signals that are designed for occupancy not more than three
persons.
3.10.7.6 Alternate tread device
The occupant load shall not exceed three and shall comply with the followings:
(a) Handrail shall be provided on both sides of alternate tread device having clear width not less than 430 mm
and not more than 610 mm
(b) Headroom shall not less than 2000 mm and angle of the device shall be between 50 degrees and 68 degrees
to horizontal.
(c) The initial tread of the device shall begin at the same elevation as the platform, landing, or floor surfaces
and the alternating treads shall not be laterally separated by a distance more than 50 mm.
(d) Treads shall have projected depth not less than 150 mm and each tread providing 240 mm of depth,
including overlapping of treads.
(e) The height of the risers shall not exceed 240 mm.
3.10.8 Stairways shall have continuous guards on both side along the direction of travel and a continuous
handrail shall be provided with inner edge guard. A stair of width more than 1120 mm but not more than 2235
mm shall have guards and handrails on both of the edges. Inner edge handrails shall be continuous and outer
edge handrails shall be along the flights extended up to one tread depth on both the landings. A stair the width
exceeds 2235 mm; intermediate handrails shall be installed with similar length of outer edge handrail. Single
traffic lane shall be calculated 560 mm in the stairway and two traffic lanes shall be 1120 mm. Widths of stairs
shall be multiple of two traffic lane other than width specified in the Table 4.3.6.
3.10.9 All exit stairways shall be constructed by materials that conform to the fire resistance requirements of
the type of construction of the building, except that solid wooden handrails shall be permitted for all types of
construction.
Bangladesh National Building Code 2015 4-23
BNBC 2015 FINAL DRAFTPart 4
Fire Protection
3.10.10 An exit stairway shall not be built around a lift shaft unless both of them are located in a smoke proof
enclosure and made of a material with fire resistance rating required for the type of construction of smoke
proof enclosure.
3.10.11 Exterior stairways used as fire stair shall not be considered as a component of means of egress, unless
they lead directly to the ground or a refuge area, are separated from the building interior by fire resistive
assemblies or walls and are constructed by noncombustible materials and free from smoke accumulation.
3.11 RAMPS
3.11.1 Ramp is a sloping surface steeper than 1 in 20 but not steeper than 1 in 8 used by walkers only. Slope of
ramps to comply with accessibility requirement shall not be steeper than 1 in 12.
3.11.2 The minimum width of exit ramps shall not be less than that width required for corridors or passages.
3.11.3 The slope of an exit ramp shall not exceed 1 in 8, but for slopes steeper than 1 in 10 the ramp shall be
surfaced with approved non-slip material or finished such as to effectively prevent slipping.
3.11.4 Guards and handrails shall be provided on both sides of ramps having slope steeper than 1 in 15.
3.11.5 Ramps shall be straight, in case of changes in the travel direction that shall be made at the level
platforms or at the landings except that ramps having a slope steeper than 1 in 12 may be curved at any place.
3.11.6 Length of the sloping portion of ramps shall be at least 915 mm but not more than 9150 mm long
between level platforms or landings.
3.11.7 Level platforms or landings shall be at least as wide as the ramps and shall be placed at the bottom, at
intermediate levels where required, and at the top of all ramps. Level platform shall be provided on each side of
openings into or from ramps having minimum length of 915 mm in the direction of travel and when a door
swings on the minimum length of platform or landing shall be 1525 mm.
3.11.8 Doors on ramps shall not be opened on sloping surface shall be complied with the requirements of 3.9
of this Chapter.
3.11.9 Sloping or ramp driveway approaching basements or any parking structures shall not be credited as an
exit ramp when slope is steeper than 1 in 8 and not complied with Sec 3.11 of this Chapter. Exits requirement of
such basements shall be achieved by stairways or fire lifts within smoke proof enclosure approached by a two
doors smoke lock vestibule.
3.12 HORIZONTAL EXITS
3.12.1 The connection between two separated areas of a building or connection between buildings at same
level which the horizontal exit serves shall be provided with at least 2 hour fire resistance rated walls, or by an
open air balcony or a bridge having protected openings.
3.12.2 The horizontal exits shall be protected from the area of incidence by self-closing fire door.
3.12.3 The width of a horizontal exit access door shall not be less than 1 m.
3.12.4 Changes in level in the elevation along the direction of the horizontal exit shall not be achieved by single
step but by ramps which is not stepper than 1 in 12.
3.12.5 Where the horizontal exit serves for only one side, fire door shall swing in along the direction of travel.
When horizontal exit serves both the side of separated area, the doors shall have two leaves and each leave
dedicated to satisfy direction of travel from assigned area, or there shall be two independent doors assigned for
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Means of Egress Chapter 3
two areas each of them serves only one area. When the building is occupied the doors installed in horizontalBNBC 2015 FINAL DRAFT
exit shall be operable at all times without the use of a detachable key.
3.12.6 Horizontal exit relocates occupants to an area which is either a public space or a space used by other
occupants and shall be termed as a refuge area. The capacity of the refuge area shall be computed on the basis
of net floor area excluding stairways, shafts and spaces allotted to occupants of the receiving end. The required
capacity of a refuge area shall be 0.28 m2 per healthy occupant and 0.3 m2 per wheelchair or 2.8 m2 per patients
retained in bed for delayed egress or an area equivalent to a passage or a corridor having width to comply the
capacity of evacuees and connected with the components of exits up to exit discharge.
3.13 SMOKE PROOF ENCLOSURE
Any compartment or a room or a control area surrounded by barrier walls within a building structure shall be
protected from smoke penetration during a fire incident occurred elsewhere in the building shall be termed as
smoke proof enclosure.
A stairway with in an envelope shall be termed as Interior stairway or staircase. Any exterior side having
opening of 50 percent or more in such a way that there shall be no smoke accumulation shall be termed as open
stair.
3.13.1 An interior stairway conforming to Sec 3.10 and having entry from an exterior balcony or through a
ventilated vestibule conform a smoke proof enclosure provided no direct opening or any aperture allowed on
the walls of the stair from the building side.
3.13.2 All exit stairways mentioned above shall be protected by a smoke proof enclosure when serving
occupants are located in a high rise building.
3.13.3 There shall be provision to access enclosed stairways through vestibule or an open balcony. The
minimum width of a vestibule shall be equal to width of connected passages or corridors specified in 3.7 in this
Chapter and the minimum length of a vestibule in the direction of travel shall be 1.8 m.
3.13.4 The minimum fire resistance rating of the walls forming a smoke proof enclosure around stairway
including the vestibule thereof shall be 4 hours and separated from the area of incidence having no openings other
than a fire door for the entry to the vestibule. For fire rating of the door see Chapter 1 Part 3.
3.13.5 All doors in smoke proof enclosure and the vestibule shall be self-closing type or they shall be fitted
with automatic closing devices actuated by the fire detection system.
3.13.6 The vestibule shall have adequate natural ventilation. Each vestibule shall have a minimum area of
openings of 2 m2 divided into two in an exterior wall facing a courtyard, street or public way wider than 6 m. The
location of one opening measuring 1.5 m2 shall be as high as possible and another shall be 0.5 m2 as low as
possible.
3.13.7 If the enclosed staircase is windowless, mechanical ventilation shall be installed. If the vestibule is
windowless, mechanical ventilation shall also be installed. In addition to ventilation a positive pressure of 50 Pa
shall be maintained in the vestibule. This positive pressure must be developed within 30 seconds of the incident
of fire. When the staircase and the vestibule are windowless emergency illumination shall be provided.
3.14 NUMBER OF EXITS
3.14.1 The number of exits shall be determined as per provisions of Sec 3.6, Tables 4.3.1, 4.3.2 and 4.3.8 of this
Chapter and complying with maximum dead end passage or corridors and maximum travel distance.
3.14.2 Total required widths of exits shall be calculated as per provisions of the Tables 4.3.2 and 4.3.8 shall be
divided and distributed at a distance not less than one-third of diagonal distance of space and the travel
Bangladesh National Building Code 2015 4-25
Part 4
Fire Protection
distance and the width of each exit shall comply with the provisions of this Code. The required number of exits
in a space as specified below:
Occupant load less than 50 Minimum 1 exit
Occupant load 50 to 500 Minimum 2 exits
Occupant load 501 to 1000 Minimum 3 exits
Occupant load more than 1000 Minimum 4 exits
3.14.3 High rise buildings having a floor area larger than 500 m2 on each floor used as educational,
institutional, assembly, industrial, storage or a mixed occupancy involving any of these or hazardous occupancy,
shall have a minimum of two staircases. These staircases shall comply with the requirements as specified in Sec
3.13 of this Chapter.
3.14.4 Where two accessible means of egress are required, the exits serving such means of egress shall be
located at a distance from one another not less than one-half the length of the maximum overall diagonal
dimension of the building or area to be served.
BNBC 2015 FINAL DRAFT
3.15 TRAVEL PATH
3.15.1 Travel path shall be measured along the center line of a natural and unobstructed path up to center of
an exit access door opening. In case of a stairway exist in the travel path shall be measured along an inclined
straight line through the center of outer edge of each tread of a stairway.
3.15.2 Occupant load and components of exits shall be arranged in such a manner that the travel path from
any point in the area served shall not be exceeded as listed in the Table 4.3.8.
3.15.3 Unit width shall be 560 mm and fraction of unit width less than 280 mm shall not be credited. Where
calculation of total required width give fractional result, next larger integral number of exit units or integral
number plus one-half shall be used. Where changes in elevation exist, one-half or less unit of width shall not be
permitted.
3.15.4 Capacity of exits shall be measured in unit of width of 560 mm and the number of occupants per unit
width shall be determined by the occupancy group and type of exits as listed in Table 4.3.8.
3.15.5 Wherever more than one exit required in a room or in any floor they shall be placed as remote as
possible from each other. As far as practicable, exits shall be arranged in such a manner to provide a refuge area
or an exit discharge to the occupants irrespective of the direction of travel from any point in an area served.
3.16 MEANS OF EXIT SIGNS AND ILLUMINATION
3.16.1 All required means of exit or exit access in buildings or areas requiring more than one exit shall be
signposted. The signs shall be clearly visible at all times, where necessary supplemented by directional signs. All
exit doors shall be clearly marked for easy identification.
Exceptions: Building occupancy type A.
3.16.1.1 Location: Exit signs shall be installed at stair enclosure doors, horizontal exits and other required exits
from the storey. When two or more exits are required from a room or area, exit signs shall be installed to clearly
indicate the direction of egress.
Exceptions:
(i) Main exterior exit doors which obviously and clearly are identifiable as exits need not be signed when
approved by the Building Official.
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Means of Egress Chapter 3
(ii) Exit signs are not required for buildings of occupancies A1, A2 and individual units of A3.
(iii) No sign is needed for exits from rooms or areas with an occupant load of less than 50 for occupancy type C.
Table 4.3.8: Determination of Exit and Access Requirements.
Maximum Capacity Ramp, Passage ,
Travel Path Number of Occupancy per unit width of Corridors
(meter) the component
Door openings
Unsprinklered
Occupancy Group/ Full fire resistive or
Classification sprinklered
To outdoors at
Grade
All other Exit
and corridor
doors
Stairs, Escalators
Ramp, Corridors, Exit
passageways,
Horizontal exit
Minimum width
(mm)
Maximum Dead End
(mm)
A1, A2 N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R.
A3, Residential 45 60 50 40 30 50 36 12190
A4,A5 45 60 50 40 30 50 36 12190
B Educational 45 60 100BNBC 2015 FINAL DRAFT 80 60 100 915 12190
C1, C2 Institutional 38 53 50 40 30 50 915 12190
C3, C4, C5 38 53 30 30 15 30 2440 9150
D Health 38 53 30 30 15 30 2440 9150
E Business 60 90 100 80 60 100 1120 15240
F Mercantile 45 60 100 80 60 100 915 15240
G1 Industrial 60 120 100 80 60 100 1120 15240
G2 60 120 100 80 60 100 1120 15240
H1 Storage 30 53 75 60 45 75 915 15240
H2 38 45 75 60 45 75 915 15240
I Assembly 45 60 100 80 60 100 1675 9150
J High Hazard 15 45 50 40 30 50 915 N.P.
Notes:
1. In Hazardous occupancy (occupancy J) Travel Path should be performance based but shall not exceed 15240 mm.
2. N.P. = Not permitted
3. N.R. = No requirement, (except as provided in Table 4.3.5b)
4. Capacity of ramp shall be reduced by twenty five percent when slope is steeper than 1 in 10.
5. Corridors serving classroom area of an educational building. Other corridors shall have a minimum width of 1120 mm.
6. Applies to corridors to patient area. Staff corridors shall have a minimum width of 1120 mm.
3.16.1.2 Graphics: The color and design of lettering, arrows and other symbols on exit signs shall be in high
contrast with their background as per NFPA 170. Words on the signs shall be at least 150 mm high with a stroke
of not less than 20 mm. For vernacular alphabet and numeric height shall be at least 150 mm with stroke not
less than 20 mm.
3.16.1.3 Illumination: Signs shall be internally or externally illuminated by two electric lamps or shall be of self-
luminous type. When the luminance on the face of an exit sign is from an external source, it shall have an
intensity of not less than 53.8 lux from either lamp. Internally illuminated signs shall provide equivalent
luminance.
3.16.1.4 Source of Power: Supply of power to one of the lamps for exit signs shall be provided by the premises
wiring system. Power to the other lamp shall be from an on-site generator set which shall be installed in
accordance with the provisions of this Code.
Bangladesh National Building Code 2015 4-27
BNBC 2015 FINAL DRAFTPart 4
Fire Protection
3.16.1.5 Floor-level Exit Signs: For floor-level exit signs additional approved low-level exit signs which are
externally or internally illuminated, or self-luminous, shall be provided in all interior exit corridors serving guest
rooms of hotels in Occupancy A5. The bottom of the sign shall be 150 mm to 200 mm above the floor level. For
exit doors, the sign shall be on the door or adjacent to the door with the closest edge of the sign within 100 mm
of the door frame.
3.16.2 Amusement Building Exit Marking: Approved exit direction marking and exit signs shall be provided.
Approved low-level exit signs and directional marking shall be located not more than 200 mm above parallel the
walking surface and at the exit path.
3.16.3 All exit signs shall be illuminated while in use at night, or during dark periods within the area served, in
accordance with the provisions of this Code.
3.16.4 The means of exit and exit access in buildings requiring more than one exit shall be equipped with
artificial lighting. The lighting facilities shall satisfy the provisions of this Code.
4-28 Vol. 1
Chapter 4
EQUIPMENT AND IN-BUILT FACILITIES
STANDARDS
4.1 SCOPE
The provisions of this chapter shall control standards of the design, installation and maintenance of equipment
and in-built fixed, localized, portable facilities required for firefighting within a building and its premises. The
regulations of this chapter shall be applicable for all buildings and the provisions stated herein shall not cover
the firefighting requirements outside the building premises.
4.1.1 Extinguishing agents can be water, dry sand, ash, inert gas, dry chemical, and wet chemicals or mixed in
nature of approved type. Agents will be selected as per the area have to extinguished.
4.1.2 The gaseous system shall be only used where water or foam cannot be used for fire extinguishing
because of the special nature of the contents within the building or areas to be protected.
4.1.3 Fixed type fire protection system means there shall be a pipe circuit to cover full or part of a building
and extinguishing agents supplied from a point. Localized fixed system means the system will cover a confined
space with a self-extinguishing device fitted with a container ready to discharge automaticity. Portable type
means the extinguishers can be hand carried in the site of incidents.
4.1.4 Fire Classification
Fire class A: Fire involving common combustibles such as wood, paper, plastics, clothes etc.
Fire class B: Fire involving flammable liquids and gases, such as gasoline, propane, and solvents.
Fire class C: Fire involving live electrical equipment such as computer, fax machine etc.
Fire class D: Fire involving combustible metals such as magnesium, lithium, aluminum etc.
Fire class K: Fire involving cooking media such as cooking oils and fats.
BNBC 2015 FINAL DRAFT
4.2 FIXED TYPE FIRE HYDRANT SYSTEM
General area of application shall be Fire class A. Fixed type fire hydrant system comprises of, stand pipes and
hose or reel pipes, sprinklers, drenchers or similar devices in appropriate combinations of these and capable of
discharging water in an area which to be extinguish.
4.2.1 Water Quantity for Fire Protection
The required flow rate and duration of water for sprinkler or stand pipe system use within the building
according to their occupancy classification shall be in accordance with Table 4.4.1 and size of pipes shall be as
per provisions of this Code or on the basis of the hydraulic design of the system to maintain flow rate and
duration of water discharge.
4.2.2 Water Sources for Fire Protection
Flow rate and duration of discharging water required for interior fire extinguishment of a building shall be
supplied from one or any combination of the following sources.
Part 4 4-29
Fire Protection
Part 4
Fire Protection
Table 4.4.1: Fire Protection Flow Requirements
Building Type Sprinkler System Standpipe and Hose System Duration in Minutes for Building Heights
(litre/min.)* (litre/min.)* Up to 51 m 51 m to 102 m Above 102 m
Light hazard- I 1000 1000 30 38 45
Light hazard- II 1900 1900 50 62 75
Ordinary hazard- I 2650 1900 75 95 112
Ordinary hazard - II 3200 1900 75 95 112
Ordinary hazard - III 4800 1900 75 95 112
Notes:
* Values will be for one riser serving floor area of 1000 m2.
Light hazard - I : Occupancy groups, A1, A2, A3, E1
Light hazard - II : Occupancy groups, A4, A5, B, C, D,E2, E3, I2, I4,
Ordinary hazard - I : Occupancy groups, I1, I3, I5, F2, F3, G1
Ordinary hazard- II : Occupancy groups, G2 , H1
Ordinary hazard- III : Occupancy groups, H2
Extra hazard : Occupancy group J - pressure and flow requirement for this group shall be determined by Fire
Department but shall not be less than required value for Ordinary hazard - III
4.2.2.1 Direct connection to water main
BNBC 2015 FINAL DRAFT
For continuous water supply (public water supply system or private system) with sufficient quantity and
pressure to feed and discharge firefighting equipment during peak demand period, direct connection of
firefighting system to the water main may be adopted, Figure 4.4.1. In this case guidelines specified in NFPA 22
are to be followed.
Stand pipe To Sprinkler System (optional)
Hose station
Check Valve Basement
Siamese
Connection
Water Supply Line
Figure 4.4.1 Typical diagram for standpipe and hose system connected directly to the water main
4.2.2.2 Roof gravity tanks
Any elevated structure holding a water reservoir or water tank or in any level within a building and having
downward supply pipelines shall be termed as gravity tank only when a water reservoir located on a roof of a
building shall be termed as roof gravity tank.
For water supply system with inadequate quantity or pressure during peak demand period but with sufficient
pressure to feed roof tank, a roof gravity tank may be provided. In that case any one of the following steps shall
be followed.
4-30 Vol. 1
Equipment and In-Built Facilities Standards Chapter 4
(a) If only the static height of the roof gravity tank is used to feed and discharge the firefighting equipment, the
height of the roof gravity tank from the top floor must be sufficient to create minimum required pressure at
the top floor hydrant point. The minimum pressure at hose outlet for standpipes supplying a 50 mm or
larger hose shall be at least 300 kPa. This minimum pressure for standpipe system supplying first aid hose
(38 mm nominal) shall be at least 200 kPa. This minimum pressure for combination of sprinkler and hose
pipe system shall be 600 kPa. To maintain the above required pressure the vertical distance of the roof
gravity tank from the top floor hydrant point shall be at 31 m, 20.5 m and 62 m respectively, Figure 4.4.2.
(b) If the vertical distance between the roof gravity tank and the top floor hydrant point cannot be maintained
for gaining required pressure and discharge, fire pump of required size and number shall be installed with
standard manufacturer recommended suction and delivery connections, Figures 4.4.3 and 4.4.4.
BNBC 2015 FINAL DRAFT
Figure 4.4.2 Typical diagram showing required static head of gravity roof tank with adequate domestic and fire reserve
4.2.2.3 Storage tank
In absence of public water supply system, the building premises shall have individual water sources specified in
Part 8. For water supply system with inadequate flow or pressure to feed and discharge by firefighting
equipment, the building premises may have deep tube well with required flow, water wells, natural water
sources or a ground (or underground) tank, roof top tank, swimming pools etc. The capacity of these facilities
shall be sufficient to satisfy the flow requirement as specify in Table 4.4.1.
4.2.2.4 Water supply test
After installation of the hydrant system, a flow test shall be conducted to verify the capacity of the discharge
system such that the installation can fulfill the minimum capacity (flow and time) as specified in Table 4.4.1. This
system shall be periodically inspected, maintained and tested in accordance with NFPA 25.
4.2.2.5 Fire pump
The firefighting equipment shall be directly feed by automatic main fire pump. Centrifugal pump, turbine-type
pump (submerged or with vertical shaft) or positive displacement pumps with adequate supply pressure and
flow capacity shall be used for water supply during demand. Centrifugal pumps shall not be used where a static
suction lift is required.
Bangladesh National Building Code 2015 4-31
BNBC 2015 FINAL DRAFTPart 4
Fire Protection
Once the pump starts, it shall run continuously until stopped manually. The pump shall be fully operational
within 30 seconds after starting. There shall be provision for manual starting where priming is necessary.
Automatic priming equipment is necessary to ensure priming at all times. The fire pump shall not be used for
other purpose.
Fire pumps shall have the rated capacities as shown in Table 4.4.2. The pump shall be rated at net pressure of
272 kPa or more as per requirement of the firefighting system demand. For pump installation procedure and
fittings NFPA 20 shall be followed.
The pump shall be housed in a readily accessible position in a building of non-combustible construction. The
pump shall be adequately protected against mechanical damage.
There shall be a provision for secondary fire pump which can be operated by dedicator generator or by an
alternate power supply source with adequate control system and incompliance with safety operation during
fire. Quality of the pump assembly shall comply with the specification of International Association of Fire. From
these generator and alternative power supply source power cannot be utilized for regular use other than (i) fire
lift, (ii) stretcher lift, (iii) emergency light, and (iv) alarm system.
(The fire pump is on the roof)
Figure 4.4.3 Typical diagram for gravity roof tank with adequate domestic and fire reserve.
4.2.3 Design Considerations for Standpipe and Hose System
4.2.3.1 The fire protection system shall be designed for their effective use either by amateur or trained
firefighting personnel or both.
4.2.3.2 All standpipes in standpipe system shall be sized so that they will provide a minimum flow specified in
Table 4.4.1. In standpipe system with more than one standpipe, the supply piping shall be sized for the
minimum flow specified in Table 4.4.1 for the first standpipe plus 1000 litre per minute for each additional
standpipe. The total number of such additional standpipes shall not be more than 8. All standpipe risers shall be
interconnected through check valves of equivalent size to prevent recirculation.
4-32 Vol. 1
Equipment and In-Built Facilities Standards Chapter 4
(The fire pump at the ground level)
BNBC 2015 FINAL DRAFT
Figure 4.4.4 Typical diagram for gravity roof tank with adequate domestic and fire reserve.
4.2.3.3 The minimum pressure for standpipes supplying a 50 mm or larger diameter hose shall be at least
300 kPa. For standpipe supplying first aid hose (38 mm nominal diameter) may have a minimum pressure of
200 kPa. The maximum pressure at any point of the system shall not exceed 2434 kPa, if the hose connection at
40 mm diameter outlet exceeds 700 kPa approved pressure regulating device shall be installed to maintain the
above maximum limits.
4.2.3.4 Diameter of the standpipe termed as size shall comply with flow and capacity requirement of the pump
shown in Table 4.4.2 or hydraulically design to provide required flow and pressure at the topmost hydrant point.
Table 4.4.2: Fire Pump Data Minimum Pipe Sizes (Nominal)
Pump Rating mm (inch)
75 (3)
litre/min (gpm) Discharge, 100 (4)
946 (250) 100 (4)
1136 (300) 125 (5)
1514 (400) 125 (5)
1703 (450) 150 (6)
1892 (500) 150 (6)
2839 (750) 200 (8)
3785 (1000) 200 (8)
4731 (1250)
5677 (1500)
4.2.3.5 The water supply required for combined system (for partial automatic sprinkler and Fire Department
hose) shall be calculated in accordance with Table 4.4.1 plus an amount equal to the hydraulically calculated
sprinkler demand.
4.2.3.6 The system for firefighting purpose may be designed with automatic fire pump with water tank at the
ground as shown in Figure 4.4.5.
Bangladesh National Building Code 2015 4-33
Part 4
Fire Protection
4.2.3.7 The water stored in storage tank for firefighting operation shall not be used for other purposes.
Accordingly separate water connections should be provided as shown in Figure 4.4.6.
To Sprinkler System (optional)
Hose station
BNBC 2015 FINAL DRAFTCheck Valve Non-Return Valve
Siamese
Connection
Water Supply Line
Ground Tank Pressuring Pump
Auto Fire Pump
Figure 4.4.5 Typical diagram for fire protection with ground tank and automatic fire pump
Figure 4.4.6 Typical diagram for storage tank (ground or overhead) with domestic and fire reserve.
4.2.3.8 The ground storage tank shall be easily accessible to fire engine of Fire Department. In absence of space
available for fire engine, the cover slab of ground storage tank shall be designed to withstand a vehicular load of
local fire engine.
4.2.3.9 The standpipe shall be located such as intermediate stair landing, vestibules or nearby in
noncombustible enclosure such that it will be able to provide hose stream to the most remote area of the floor
served.
4-34 Vol. 1
Equipment and In-Built Facilities Standards Chapter 4
4.2.3.10 The hose shall be connected to the standpipe within a height not more than 1.5 m from the finished
floor level. The hose stations shall be easily accessible for inspection and testing.
4.2.3.11 The hose connection to a standpipe for large stream shall be at least 100 mm nominal and that of small
stream may be 63 mm or 50 mm on each point. The size of first aid hose shall be 38 mm nominal. The hose
length shall not be more than 30 m.
4.2.3.12 Different piping materials and fittings for standpipe system presented in Tables 4.4.3 and 4.4.4 shall
conform to the standard or one of the standards cited against them. The standard requirements for other
materials not provided in these tables shall be subject to the approval of the Authority.
Table 4.4.3: Piping for Standpipe System Standard
Material ASTM B75, ASTM B88
ASTM B251
Copper Tube ASTM A55, ASTM A120, ASTM A135
Copper and Copper-Alloy Tube ANSI B36.10
Steel Pipe
Wrought Steel or Iron
Table 4.4.4: Standpipe FittingsBNBC 2015 FINAL DRAFT Standard
Material
ANSI 616.1, ANSI B16.4
Cast Iron ANSI B16.18, ANSI B16.22
Copper ANSI B16.3
Malleable Iron ANSI B16.5, ANSI B16.9, ANSI B16.11, ANSI
Steel B16.25, ASTM A234
4.2.3.13 The standpipe riser shall be supported at the top and at the lowest level. The riser shall also be
provided with support at the alternate level in between top and bottom level of the standpipe riser. The support
shall be of adequate strength to support the water-filled pipe load and an additional load of 110 kg.
4.2.3.14 The horizontal standpipe shall have hangers with a spacing not more than 5 m. The hanger shall be able
to carry a load of five times the weight of the water-filled pipe and an additional load of 110 kg.
4.2.3.15 There shall be Siamese connection also termed as firemen connection to the standpipe or to the
delivery pipe of the gravity roof storage tank. The location of Siamese connection shall be easily accessible from
the street or means of access.
4.2.3.16 The system shall be provided with adequate drainage piping to discharge under pressure. The drain
pipe shall not discharge into sanitary sewer.
4.2.3.17 All control valves shall be designed to withstand the pressure specified in Sec 4.2.3.3
4.2.4 Wet Riser
A wet riser is a vertical pipe of not less than 100 mm internal diameter, kept permanently charged with water
which is then immediately available for use on any floor in the building at which a hydrant or landing valve is
provided. The riser is connected to a booster pump or town main of suitable capacity so that they are capable to
supply four 13 mm jet at 2.5 bars at the highest outlets.
4.2.5 Down Comer
A similar function to that of wet riser is performed by down comer which like a wet riser is constructed of
vertical piping, with outlets at different levels, but is supplied with water from a tank in the roof through terrace
pump, gate valve and non-return valve. It is also fitted with inlet connections at ground level and air release
valve at roof level for being capable of charged with water by pumping from fire engines.
Bangladesh National Building Code 2015 4-35
BNBC 2015 FINAL DRAFTPart 4
Fire Protection
4.2.6 High Velocity Water Spraying Projector System
This system applies water in the form of conical spray consisting of droplets of water traveling at high velocity.
The three principles of extinguishments are employed, namely emulsification, cooling and dilution. While the
water droplets are passing through the flame zone, some of the water is turned into steam, diluting the oxygen
feeding the fire. Addition of water to the burning oil also cools it and reduces the rate of vaporization. In
addition to this droplets of water traveling at high velocity bombard the surface of the oil to form an emulsion
of oil and water that will not support combustion.
4.2.7 Water Mist Technology
Fine water spray suppression system can extinguish fires using water and nitrogen from air. Nozzle is used to
atomize water by nitrogen or other suitable media to generate mist or fog of finely controlled water droplets.
The system operates at low pressure and produces droplets in a range of 80 to 200 microns. These droplets
extinguish fire rapidly and efficiently even those involving highly volatile hydrocarbons. This system is an
alternative to Halon and other gaseous system in many applications.
4.2.8 Drenchers
Drenchers are used for the external protection of the building against exposure hazard, or radiant heat.
Drencher heads are similar to sprinkler heads and may be sealed or unsealed. Drenchers are of three types, roof
drenchers, wall drenchers, window drenchers.
4.2.9 Dry Riser System
Dry riser stand pipe system shall be an equivalent alternative of wet riser stand pipe system. The water supply
for an automatic or semi-automatic standpipe system shall be designed such that the system must be capable of
supply the system during peak demand hour.
4.2.10 Design Consideration of Sprinkler System
4.2.10.1 A system of water pipes fitted with sprinkler heads as per manufacturers specification may be installed
actuate automatically, control and extinguish a fire by the discharge of water.
4.2.10.2 The pipe schedule sizing to supply different number of sprinklers for their different uses may be in
accordance with Tables 4.4.5 and 4.4.6
4.2.10.3 Each sprinkler shall serve a maximum ceiling area specified in Table 4.4.7 for different types of building
according to their uses.
4.2.10.4 Water supply piping and fittings for sprinkler system shall conform to the standard or one of the
standards cited against them in accordance with Tables 4.4.4 and 4.4.8. The standard requirements for other
pipe materials not provided in these tables shall be subject to the approval of the Authority.
4.2.10.5 The sprinkler system shall be provided with adequate support or made flexible to prevent pipe
breakage during earthquake
4.2.10.6 The hanger in sprinkler system shall be designed to carry a load equal to five times the weight of the
water-filled pipe plus an addition load of 110 kg. The support shall be designed to support a load equal to the
weight-filled pipe plus and additional load of 110 kg.
4.2.11 Connection
4.2.11.1 There shall be Siamese connection to the sprinkler system located outside the building and accessible to
the fire department connection.
4.2.11.2 All risers shall be connected through a gate valve with a main of size equal to that largest riser.
4.2.11.3 The sprinkler system shall be provided with adequate drainage arrangement. The drain pipe shall not
discharge into sanitary sewer.
4-36 Vol. 1
Equipment and In-Built Facilities Standards Chapter 4
4.2.11.4 All control valves and fittings shall be able to withstand the pressure specified in Sec 4.2.3.3.
4.2.12 Inspection, Testing and Maintenance
4.2.12.1 Inspection
All piping and equipment shall be inspected for satisfactory supports in accordance with Sec 6.15 in Part 8 of this
Code and protection from damage and corrosion. All outlets shall be free from obstruction.
Table 4.4.5: Size of Water Supply Steel Pipe to Sprinklers
Pipe Size mm (inch) No. of Sprinkler for No. of Sprinkler for No. of Sprinkler for Ordinary Extra
Ordinary Hazard * Hazard *
nominal Light Hazard* 1
2
25 (1) 2
32 (11) 3 3 2
5 5 5
4 10 10 8
38 (11)
2
50 (2)
63 (112) 30 20 15
75 (3) 60 40 27
BNBC 2015 FINAL DRAFT
88 (31) 100 65 40
2 NL** 100 55
- 160 90
100 (4) - 275 150
125 (5) - 400*** 225***
150 (6)
200 (8)
* Definitions of these terms are given in Table 4.4.1.
** No limit.
*** One sprinkler system riser or combined system riser shall serve the floor area not more than 4850 m2 for light and
ordinary hazardous occupancy and 2325 m2 for extra hazardous occupancy
Table 4.4.6: Size of Water Supply Copper Pipe to Sprinklers
Pipe Size No. of Sprinkler Connection No. of Sprinkler No. of Sprinkler
Connection Ordinary Connection Ordinary
mm (inch) nominal for Light Hazard*
Hazard * Extra Hazard *
25 (1) 2
2 1
32 (11) 3 32
5 55
4 12 12 8
38 (11)
2
50 (2)
63 (11) 40 25 20
65 45 30
2
75 (3)
88 (312) 115 75 45
100 (4) NL** 115 65
125 (5) - 180 100
150 (6) - 300 170
200 (8) - *** ***
* Definition of these terms is given in Table 4.4.1.
** No limit.
*** One sprinkler system riser or combined system riser shall serve the floor area not more than 4850 m2 for light and
ordinary hazard occupancy and 2325 m2 for extra hazard occupancy
Bangladesh National Building Code 2015 4-37
Part 4
Fire Protection
Table 4.4.7: Ceiling Area for a Sprinkler
Construction Type Light Hazard Ordinary Hazard Extra Hazard
Protected Spacing Protected Spacing Protected Spacing
area (Max) area (Max) area (Max)
ft² (m²) ft (m) ft² (m²) ft (m) ft² (m²) ft (m)
Roof or Floor on Trusses, Girders 200 (18.6) 15 (4.6) 130 (12.1) 15 (4.6) 100 (9.3) 12 (3.7)
or Beam
With High Piling ***
Open Wood Joists 225 (20.9) 15 (4.6) 130 (12.1) 15 (4.6) 100 (9.3) 12 (3.7)
With High Piling ***
Other Type of Construction 168 (15.6) 15 (4.6) 130 (12.1) 15 (4.6) 100 (9.3) 12 (3.7)
With High Piling ***
* Maximum distance in m between sprinklers and between line of piping.
* * The definitions of these terms are given in Table 4.4.1.
** * Storage facilities which permit closely piled materials over 4.5 m or materials on rack over 3.6 m.
Table 4.4.8: Piping for Sprinkler System Standard
Material
BNBC 2015 FINAL DRAFT
Copper and Copper-Alloy ASTM B32, ASTM B75, ASTM B88, ASTM B25, ANSI B36
Steel ASTM A53, ASTM A120, ASTM A135, ASTM A795
4.2.12.2 Testing
Fire protection plumbing system or part thereof shall be tested and approved after installation by the Authority.
(a) Testing of Standpipe System: The hydrant pipes shall be hydraulically tested to a pressure 1400 kPa or 150%
of working pressure whichever is the higher for 2 hours without any leakage at any points. The system shall
be able to maintain above test pressures. The system shall also be tested for the required flow at the
highest outlet.
(b) Testing of Sprinkler System: This system shall be tested for at least 2 hours for a pressure of 1000 kPa or at
350 kPa in excess of normal working pressure when normal working pressure will be more than 650 kPa.
The system shall be able to maintain above test pressures. The system shall also be tested for the required
flow at the highest outlet.
(c) Testing of Sprinkler System Pump: The pump used for sprinkler system firefighting purpose shall be tested
by approved authority for their performance characteristics and this test report must be submitted at the
time of supply of pump. The pump shall be retested or repaired to its original condition if their performance
characteristics fall below more than 10 percent of the supplier's test characteristic curve or as specified for
the fire protection water supply system.
4.2.12.3 Maintenance
The system shall be maintained for safe operating conditions and tested at least once a year.
4.3 FIXED INSTALLATION OTHER THAN WATER
Other than water there are different types of fixed installation. These are of mainly two types. (a) Centrally
fixed, (b) locally fixed.
4.3.1 Centrally Fixed Installation Discharging Extinguishing Agent other than Water
4.3.1.1 General
This installation can be of two types, one for zone coverage and the other for total coverage. For these system
pipe circuits and exhaust manifold are required and shall have special discharging Alarm distinctly different than
fire alarm. These fixed installations can be of different types, such as (a) Foam installation, (b) Vaporizing liquid
4-38 Vol. 1
Equipment and In-Built Facilities Standards Chapter 4
installation, (c) Dry powder installation. (d) Gaseous installation (e) Dry chemical installation (f) Wet chemicalBNBC 2015 FINAL DRAFT
installation.
4.3.1.2 Foam installation
Foam extinguishing system shall be of an approved type and shall be installed in accordance with the
specification of the manufacturer. The foam extinguishing system is designed to discharge fire suppressive foam
concentrates over the area to be protected.
(a) There are different types of foam installation, such as (i) Pump operated mechanical foam installation, (ii)
Self-contained pressurized installation, (iii) Pre-Mixed Foam installation, (iv) High Expansion Foam
installation.
(b) A foam extinguishing system shall be automatically actuated during a fire with provision of manual
actuation.
(c) Warning sign and discharge alarm system shall be provided with the foam extinguishing system, which shall
be actuated during the use of the system.
(d) The system provides protection of boiler rooms with its ancillary storage of furnace oils in basement and
other areas where hazardous liquids are stored.
4.3.1.3 Vaporizing liquid installation
Liquefied compressed Halogenated hydrocarbon is fed through distribution pipe works and specially designed
discharged nozzles to the area need to be extinguished. Upon discharge the liquid immediately vaporized to
form a heavy vapour which achieves very rapid extinction.
There are two types of Vaporizing liquid installation, such as total flooding system and Local application system.
This system shall be installed in accordance with the specification of the manufacturer. Safe guards are
necessary to prevent injury or death of personnel in area where the atmosphere may be made hazardous by the
discharge.
4.3.1.4 Dry powder installation
Dry powder of certain chemicals installation consist of pipe work and discharge nozzle and pressuring media.
This installation can be operated automatically or manually. This can be designed for total coverage and for
zone coverage.
Dry powder is a range of chemical agents available as extinguishing media. They are used on various flammable
liquids where they are confined. This system shall be installed in accordance with the specification of the
manufacturer.
4.3.1.5 Gaseous installation
(a) General: Gaseous extinguishing system shall be of an approved type and shall be installed as per provisions
of this Code. The system supplies gas from a pressurized vessel through fixed pipes and nozzles.
(b) The system is used where water or foam cannot be used for fire extinguishing because of the special nature
of the contents within the building or areas to be protected.
(c) The system shall be automatically actuated and shall be equipped with manual actuation devices as well.
(d) Warning signs and discharge alarm shall be provided where persons are likely to be trapped in an area made
hazardous due to discharge of extinguishing gases
(e) Halocarbon agents and inert gas system: Any approved Type of Halocarbon agents are chemicals in the
liquid form at high pressure and vaporize readily leaving no residue. These are primarily to protect
hazardous fire in enclosed room, vaults, machines, containers, storage tanks, engines, unattended
computer server rooms, electrical appliances, liquid gas storage etc. Some example of these chemical is
dichlorodifluoro ethane, chlorodifluoro methane. Inert gas system is also an alternative of Halocarbon
Bangladesh National Building Code 2015 4-39
BNBC 2015 FINAL DRAFTPart 4
Fire Protection
agents. These are nitrogen and argon in pure form or in mixer at different proportion. These gases are
identified as clean total folding fire suppression agents. They are stored in high pressure gas cylinders.
4.3.1.6 Dry chemical extinguishing system
(a) General: Dry chemical extinguishing system shall be of an approved type and shall be installed in
accordance with the provisions of this Code and manufacture's instruction.
(b) The system shall be automatically actuated during a fire and shall be equipped with manual actuation
device as well.
(c) Warning signs and discharge alarm shall be provided where persons are likely to be exposed to chemical
discharge. Chemical agents of the system shall be nontoxic.
4.3.1.7 Wet chemical extinguishing system
(a) A wet chemical system is a solution of water and potassium carbonate or acetate based chemical which
forms the extinguishing agent. The system shall be installed in accordance with the provisions of this Code
and manufacturer's installation instruction.
(b) The system shall be automatically actuated during a fire and shall be equipped with manual actuation
device as well.
(c) In case of wet chemical extinguishing system, label of the approved agent shall be affixed.
(d) Warning signs and discharge alarm shall be provided where persons are likely to be exposed to wet
chemical discharge.
4.3.2 Localized Fixed
Containerized extinguishing agent are available in different shapes and size to be placed in different locations
those are prone to fire hazard as for example at the top of cookers in the kitchen, electric connection box etc.
Use of these containers shall be approved type and installation shall be as per specification of the manufacturer.
4.4 PORTABLE FIRE EXTINGUISHER
4.4.1 Portable fire extinguishers shall readily available in different type. These are portable fire extinguisher
are of carbon dioxide types, dry chemical types, water types, and Halon types, film-forming type, foam types
and Halon carbon type. For proper operation persons with adequate knowledge and familiar with their
operation must be available.
4.4.2 In accordance with the occupancy hazard, specification of the manufacturer and guide line set by NFPA
10, the minimum number of portable fire extinguishers for different class of fire shall be ascertained. As for
example where the floor area of a building is less than 279 m2 at least one fire extinguisher of the minimum size
is recommended for Fire Class A.
4.4.3 Portable fire extinguishers shall be fully charged, operable at any time and conspicuously located where
they will be readily accessible. Portable fire extinguishers shall not be obstructed or obscured from view. In large
rooms, means shall be provided to indicate the extinguisher location.
4.4.4 Portable fire extinguishers shall be adequately protected from impact, vibration, and adverse
environment and shall not be exposed to temperatures outside the listed temperature range shown on the fire
extinguisher label.
4.4.5 Portable fire extinguishers mounted in cabinets or wall recesses shall be placed so that the fire
extinguisher operating instructions face outward. The location of such fire extinguishers shall be marked
conspicuously.
4.4.6 The owner or designated agent or occupant of a property in which fire portable extinguishers are
located shall be responsible for inspection, maintenance, and recharging. The procedure for inspection and
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maintenance of fire extinguishers varies considerably. Monthly "quick check" or inspection in order to follow theBNBC 2015 FINAL DRAFT
inspection procedure as outlined in NFPA 10 shall be done.
4.4.7 Maintenance, servicing and recharging shall be performed by trained persons having available the
appropriate servicing manual(s), the proper types of tools, recharge materials, lubricants, and manufacturer's
recommended replacement parts or parts specifically listed for use in the fire extinguisher. These extinguishers
shall be maintained as per NFPA 10, at intervals of not more than one (1) year.
4.4.8 All rechargeable-type fire extinguishers shall be recharged after any use or as indicated by an inspection
or when performing maintenance or as per the recommendations of the manufacturer.
4.4.9 For personal safety during approach with extinguishing equipment it shall be remembered that most
fires produce toxic decomposition products of combustion and some materials can produce highly toxic gases.
Fires can also consume available oxygen or produce dangerously high heat. All of these can affect the degree to
which a fire can be safely extinguished.
4.4.10 All extinguishing agents other than clean agents shall be approved by the authorities having jurisdiction.
4.5 RATE OF WATER FLOW FOR FIRE PROTECTION IN TALL BUILDING
High rise building exceeding 80 meter height shall be termed as Tall Building. The quantity, sources and mode of
water supply in tall building shall be in accordance with Sec 4.2. In high rise buildings fittings and equipment for
firefighting may be subject to excessive pressure.
Pressure on firefighting equipment in Tall building shall be reduced by dividing the building into different zones.
In this process the building shall be divided into different water supply zones so that the firefighting equipment
will serve within their maximum allowable limit of pressure. Separate automatic fire pump or combination of
tank and automatic pump shall be installed for supplying water to the fire-fighting equipment in each zone,
Figures 4.4.7 and 4.4.8.
4.6 FIRE DETECTION AND ALARM SYSTEM
4.6.1 Fire Detection Shall be Done by the Following Ways
(a) Human surveillance:
Human surveillance shall be acceptable where the user and occupant are capable of maintaining surveillance for
detecting fire and smoke when a person appointed and assigned to detect fire shall be termed as Fire watch.
(b) Automatic smoke or/and heat detection :
The installation of automatic fire and smoke detection system shall be a necessity when the size, arrangement
and occupancy of a building become such that a fire itself cannot provide adequate warning to its occupants.
The automatic fire and smoke detection system shall include, spot or line type heat sensitive detectors and
optical, ionized or chemical sensitive type of smoke detectors.
(c) Video surveillance :
Cameras capable of registering and transmitting real time images in to a monitoring device having display
commonly termed as CCTV shall be installed systematically to cover an area for detecting any incision of smoke
and fire. This CCTV will remain under either human surveillance or monitored by compatible software to
transmit signal automatically to the fire alarm system and also to the authorized persons.
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4.6.2 Fire Alarm System
Water efficient fittings, including faucets, showerheads and flushes, that use less water for the same function as
effectively as standard models, shall be used in buildings of all occupancies. The low flow fixtures shown in Table
3.4.7 shall be used.
4.6.2.1 In a fire incident, panic management shall be the prime concern for a successful relocation, delayed
egress or evacuation of occupants from a building structure. Activation of alarm shall be sequential and
compatible with all design scenarios. Means of egress system is so designed that all alarms of a building shall not
be activated at a time. A general announcement of fire shall be done for the occupant or the word “Fire” shall
be avoided but authorized persons responsible for evacuation shall be alerted through Password or Pass Phrase.
As per design scenarios a systemic execution protocol shall be developed where a building shall be sub-divided
into zones for installation alarms and for fight in place, relocation of occupants, delayed egress or immediate
evacuation.
Alarm system can be of different types, such as audible alarm, visual alarm, vibration alarm, and display alarm.
(a) Audible alarm: Ringer, bell, horn, chime and voice command via public address system (PA system) are the
examples of audible alarm system.
(b) Visual Alarm: A bright white light emitting device with specific intensity and cycle of emission is capable to
draw attention of a person having limited hearing shall be termed as visual alarm. A visual alarm shall be
installed where a person working alone in a room or a space having hearing limitations. In a public place or
in any place more than two persons are present and one having normal hearing ability shall not require to
install visual alarm.
(c) Vibration Alarm: Alarm activated through vibration can be used for alarm.
(d) Display Alarm: Textual, graphical or pictorial display on screens or monitors can be used as alarm.
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Figure 4.4.7 Typical diagram for fire protection in different water supply zones of a tall building Vol. 1
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Figure 4.4.8 Typical diagram for fire protection in different water supply zones of a tall building
4.6.2.2 Each floor shall be separated as zone for the purpose of alarm annunciation.
4.6.2.3 A floor is subdivided by fire or smoke barriers and allows relocation of occupants from area of incident
to another area on the same floor each area shall be considered as a zone and annunciated separately for the
purpose of alarm location.
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4.6.2.4 Notification zones shall be consistent with emergency response or evacuation plan for the protected
premises. The boundaries of notification zones shall be coincident with building peripheral walls, fire or smoke
compartment boundaries, floor separations or other fire safety subdivisions.
4.6.2.5 If required by the authorities having jurisdiction, the alarm system be allowed the application of alarm
signal to one or more zones at the same time, shall allow voice paging to the other zones or in any combination.
4.6.2.6 Alarm annunciation at the fire command center shall be by means of audible and visible indicators.
4.6.2.7 Activation of fire extinguishment system shall have a supervisory alarm. An automatic extinguishment
system capable of discharging other than water extinguishing agents shall have dedicated and distinct alarm
system and shall be actuated before discharging such agents.
4.7 RELATED APPENDIX
Appendix C Detail Guidelines for Selection and Sitting of Fire Detection System
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Chapter 5
REQUIREMENTS FOR FIRE DETECTION AND
EXTINGUISHING SYSTEM
5.1 SCOPE
Installation of fire detection and firefighting equipment fixed centrally or localized or portable and theirBNBC 2015 FINAL DRAFT
arrangement in the buildings shall be performance based. Construction type and occupancy classification of
Buildings shall be as per provisions of this Code. Part 3 of this Code shall be determinant of construction type and
the A-Z list for occupancy classification. Installation of fire detection and firefighting equipment shall comply with
the Chapter 4 of Part 4 of this Code.
Intent of this Chapter is to reduce the probability of fire incident by confinement, extinguishment to reduce
probability of injury or death from fire, structural failure due to fire and safety of building use.
Provisions of this Chapter shall be considered as minimum requirement and shall not be intended to prevent
additional installation of higher standard of equipment.
5.1.1 Performance based fire protection system which includes “Passive” that is arrangement of building
components and “Active” means detection, alarm, extinguishment devices and equipment which shall be
incorporated in all buildings unless otherwise specified in this Code. Performance based design considerations
shall be as follows:
(a) The starting of a fire incident shall be a single source to evaluate the fire protection system.
(b) The prime objective of a fire protection system to safe life and minimization of property damage shall be
achieved by using required design scenarios and the performance criteria to be fulfilled. Each design scenario
shall be challenging as realistic and the probability of occurrence is present in the building shall be reduced
and protected.
(c) Design scenario shall include but not limited to those specified in Sections 5.1.2 to 5.1.4 and shall be
documented and demonstrated to the satisfaction of the authorities having jurisdiction.
(d) Each design scenario used in the performance-based design shall be translated into input data specification
as appropriate for calculation method or model.
(e) Input data of any design scenario did not analyzed and explicitly addressed or incorporated shall be omitted
from input data specifications shall be identified by a sensitivity analysis of the consequences of the
modification for such omissions shall be performed.
5.1.2 Design Scenario I
Fire Class and Fire resistance rating shall be determined as per provision of this Code for the followings:
(a) All surface finish materials.
(b) Structural Members.
(c) Joints of Structural Members.
(d) All slabs.
(e) Roof Slab.
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(f) Joints between Slabs.
(g) All Exterior Walls.
(h) All Interior Walls.
(i) Partitions.
(j) Suspended Ceiling.
Construction classification and the structural stability shall be concluded and documented.
5.1.3 Design Scenario II
Occupancy specific design scenario representative of a typical fire shall explicitly specify the following:
(a) Occupant activities.
(b) Number and location of occupants.
(c) Room size.
(d) Number of Control Area.
(e) Furnishings and contents.
(f) Fuel Properties represented by Fire Class and ignition sources.
(g) Ventilation conditions.
(h) First item ignited and its location.
5.1.4 Design Scenario III
(a) The largest possible fuel load characteristic of the normal operation of the building shall be considered
regarding a rapid developing fire in presence of occupants.
(b) A slow-developing fire shielded from protection in the close proximity to a high occupancy area shall be
considered a concern regarding a relatively small ignition source causing a significant fire.
(c) A concealed space or suspended ceiling space adjacent to a large occupied room shall be considered a concern
regarding a fire originating in a concealed space that does not have either detection system or suppression
system and then spreading into the room within holding the greatest number of occupants.
(d) An Ultrafast developing fire in the main exit access portion in a condition when interior doors are open but
reduction in number of available of means of egress shall be considered.
(e) A room normally unoccupied from where a fire starts that can potentially endanger a large number of
occupants in a room or other area shall be considered.
(f) The concern regarding exposure of fire outside of an area of incident started at a remote location either
spreading from the area or bypassing barriers spread into another area and developed untenable condition
thereof.
(g) The reliability and the design performance shall be considered for fire detection and protection system in
such a way that a fire originating in ordinary combustibles in a room with each passive or active fire protection
system or fire protection feature independently rendered ineffective shall be considered individually being
unreliable or becoming unavailable. This scenario shall not be considered for a room or a space or a building
where fire detection and protection systems or any independent features are absent.
5.1.5 Fire class shall be determined for all movables in each room and all control areas in the building.
5.1.6 Fire Protection Plan
A building or part thereof must have a fire protection plan for the following cases.
(a) High rise building or building sections 33 m and above in heights.
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(b) Building or building sections classified in the occupancy groups J, G, H, K and M which are two or more storeyBNBC 2015 FINAL DRAFT
in height with over 1858 m2 per gross floor area or are two or more in height with total area exceeding 4717
m2 gross floor area.
(c) Building classified as A3 containing 30 or more dwelling units.
(d) Part of building used as mercantile, assembly or institutional for care having gross floor area over 930 m2.
(e) Alteration to a building or a portion thereof listed in Sections 5.1.6(a) to 5.1.6(d) above, if cost of alteration
equivalent to one third cost of new construction of the same or more or involves changes in occupancy
classification.
(f) The plan shall include information where applicable building address, height in meter, occupancy
classification, detail occupant load,
(g) Key Plan shows all floors, exits, corridors, partitions serving as fire separations or compartments, locations
and ratings of required enclosures, windowless stair with pressurization, exit discharge, locations of frontage
space including street width of abutting plot.
(h) Descriptions in narrative forms of safety systems and features where applicable, including:
·Communications systems
·Alarm system
·Detection systems
·Location of fire commend station
·Elevator recall
·Emergency Lighting and power.
·Extinguishing equipment.
·Compartmentation.
·Horizontal Exits.
·Mechanical ventilation and air conditioning.
·Smoke control systems and equipment
·Furnishing type and materials
·Places of assembly
·Fire department access.
·Other system, required or voluntary to be installed.
(i) A Fire protection plan shall be signed by the same architect who is singing on the proposed drawings for
building approval and any person responsible for the Fire protection design.
5.2 SPECIFIC RECOMMENDATIONS
Specific recommendations applicable for buildings complied with the followings:
5.2.1 All building constructed monolithically as per provisions of this Code as an inherent full fire resistive
construction type shall be termed as Type I-A.
5.2.2 All surface finishes shall be Class-I within the range of zero to twenty five flame spread index.
5.2.3 Any offsite construction, pre-stressed, pre-fabricated or steel structure encased with fire resistive
assembly shall be termed as Modified Type I-A.
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5.2.4 The following recommendations for fire protection system specified in Sections 5.3 to 5.14 are made
based on construction type and surface finishes specified in Sections 5.2.1 and 5.2.2 respectively.
5.2.5 All buildings of any occupancy type and construction type as per provisions of this Code other than
Sec 5.2.1 with all surface finish as per Sec 5.2.2 shall provide a performance based fire protection.
5.3 OCCUPANCY A: RESIDENTIAL
The residential buildings complied with Sections 5.2.1 and 5.2.2 shall provide the following active fire protection:
5.3.1 Occupancy A1 and A2: Single Family Dwelling and Two Families Dwelling
(a) For low rise building fire detection and fixed firefighting arrangements shall not be required.
(b) High rise buildings exceeding each floor area 500 m2 shall have manual alarm system and portable
extinguishers provided in the escape stairs route or in fire lift lobby and as per provision of this Code.
(c) High rise buildings exceeding each floor area 500 m2 shall have manual alarm system and dry or wet riser
hydrant system per provision of this Code.
5.3.2 Occupancy A3: Flats and Apartments
(a) Up to 20 m height fire detection and fixed firefighting arrangement shall not be required.
(b) No protection required within the dwelling units of flats and apartments high rise buildings manual alarm
system and fixed hydrant system shall be provided in the landings of fire stairs or in the left lobby as per
provision of this Code shall be required.
5.3.3 Occupancy A4: Mess, Boarding House and Hostels
(a) For buildings up to 2 storey height, fire detection, fire alarm and fixed firefighting arrangements shall not be
required.
(b) Buildings having 3 stories and having floor area less than 300 m2 shall not require fire detection and fixed
firefighting arrangements.
(c) The floor area of 3 stories building having more than 300 m2 per floor and less than 33 m height having central
corridor with rooms on both sides, manual fire alarm system shall be provided along with portable fire
extinguishers. Instead of double loaded corridor a single loaded corridor having 3 m width shall not require
any detection and fixed firefighting arrangements.
(d) High rise boarding house, mess and hostels manually operated electric fire alarm system shall be provided
along with hydrant system.
5.3.4 Occupancy A5: Hotels and Lodging Houses
(a) For buildings up to 2 storey height, fire detection, fire alarm and fixed firefighting arrangements shall not be
required.
(b) Buildings having 3 floors or above and having floor area less than 300 m2 shall not require fire detection and
fixed firefighting arrangements.
(c) The floor area of such building is more than 300 m2 per floor and low rise building having central corridor with
rooms on both sides, manually operated fire alarm system shall be provided along with portable fire
extinguishers.
(d) High rise hotels and lodging houses manually operated electric fire alarm system shall be provided along with
hydrant system.
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5.4 OCCUPANCY B: EDUCATIONAL
The educational buildings complied with Sections 5.2.1 and 5.2.2 shall be provided with the following active fire
protection:
5.4.1 Low rise buildings with open corridor of 3m width fire detection and fixed firefighting arrangements shall
not be required.
5.4.2 High rise building or building having central corridor with classrooms on both sides, manual fire alarm
and fixed firefighting comprised of dry or wet riser arrangements shall be required as per provisions of this Code.
Single loaded open corridor having 3 m width shall have manual detection and manual alarm system along with
hydrants.
5.4.3 Where hydrants cannot be used to extinguish fire in those areas appropriate portable firefighting
appliances shall be installed as per standard.
5.5 OCCUPANCY C: INSTITUTION FOR CARE
The Institution for care buildings complied with Sections 5.2.1 and 5.2.2 shall be provided with the following active
fire protection:
5.5.1 Occupancy C1: Institution for Care of Children:
Fire detection and fixed firefighting arrangements shall not be required. Portable firefighting appliances shall be
installed as per the provisions of this Code.
5.5.2 Occupancy C2: Custodial Institution for the Physically Capable adults:
Fire detection and fixed firefighting arrangements shall not be required. Portable firefighting appliances shall be
installed as per the provisions of this Code.
5.5.3 Occupancy C3, C4, C5: Custodial Institution for the Physically Incapable, Penal and mental institutions
for children and Penal and mental institutions for adults:
Manually operated electric fire alarm system shall be installed. Portable firefighting appliances shall be installed
as per the provisions of this Code.
BNBC 2015 FINAL DRAFT
5.6 OCCUPANCY D: HEALTH CARE FACILITIES
The Health care facilities buildings complied with Sections 5.2.1 and 5.2.2 shall be provided with the following
active fire protection:
5.6.1 Occupancy D1: Normal Medical Facilities:
Manually operated electric fire alarm system or automatic fire alarm system shall be installed in the duty room,
so that the duty personnel receive the fire warning well in advance. Portable fire fighting appliances shall be
installed as per the provisions of this Code.
5.6.2 Occupancy D2: Emergency Medical Facilities:
The requirements shall include the installation of manually operated electric fire alarm system or automatic fire
alarm system so that the duty personnel receive the fire warning well in advance. Portable fire fighting appliances
shall be installed as per the provisions of this Code.
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5.7 OCCUPANCY E: BUSINESS
The Business buildings complied with Sections 5.2.1 and 5.2.2 shall be provided with the following active fire
protection:
Buildings Active Fire Protection
(i) Office buildings up to 2 storey high and
Portable fire extinguishers or hydrants.
500 m2 single effective undivided space in a floor.
(ii) Office buildings more than 2 storey high or more Manually operated electric fire alarm system shall be provided
along with portable fire extinguishers or hydrants.
than 500 m2 single effective undivided space in a
floor. Automatic fire alarm system and performance based extinguishing
(iii) Laboratories with precession instruments. system.
(iv) Control areas of office buildings dealing with Automatic foam or gaseous or dry chemical fire extinguishing
flammable liquids. system required along with portable fire extinguishers.
(v) Solvent storage in a control area of an office Automatic fire alarm and performance based foam or gaseous or
dry chemical fire extinguishers or portable fire extinguishers.
(vii) Telecommunication, Internet gateway equipment
or computer installation in an unattended server Automatic fire alarm system and performance based fixed
room. gaseous or fixed vaporizing liquid extinguishers or portable fire
extinguishers.
(viii) Electrical low tension distribution panel room in a
sub-station. Automatic fire alarm and performance based localized fixed
gaseous or vaporizing liquid extinguisher or portable fire
(ix) Space under one false ceiling more than 500 m2 extinguishers.
(x) Essential Services (Occupancy E3) Automatic fire alarm system shall be installed for above and under
the false ceiling.
Due to importance of services and the functionality of the building
of this occupancy classification during any national or local
emergency situation thus the fire protection system design shall
be performance based.
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5.8 OCCUPANCY F: MERCANTILE
The Mercantile buildings complied with Sections 5.2.1 and 5.2.2 shall be provided with the following active fire
protections:
5.8.1 Occupancy F1: Small Shops and Markets
Mercantile Active Fire Protection
(i) Whole sale establishments, transport booking Manual fire alarm system shall be provided along with portable fire
establishments. extinguishers or hydrant.
(ii) Other premises (other than shops, stores, markets Manual fire alarm system shall be provided along with portable fire
etc.) extinguishers or hydrant.
5.8.2 Occupancy F2: Large Shops and Markets Active Fire Protection
Mercantile Manual fire alarm system and portable fire extinguishers shall be
(i) Shopping arcade with central corridors open to sky provided or hydrant.
Manual fire alarm and dry or wet riser with performance based
(ii) Mercantile building under covered roof with single portable fire extinguisher shall be installed.
effective undivided space more than 500 m2 on
each floor Automatic fire alarm, sprinklers and standpipe with performance
based portable fire extinguisher shall be installed.
(iii) Underground mercantile structure
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5.8.3 Occupancy F3: Petrol and CNG Stations Active Fire Protection
Mercantile
Fixed automatic foam or gaseous or dry chemical fire extinguishing
(i) Petrol pump and CNG station, automobile garages system shall be provided along with portable extinguisher.
(ii) Aircraft hangars Automatic foam or gaseous or dry chemical fire extinguishing
system shall be provided along with portable extinguisher.
BNBC 2015 FINAL DRAFT5.9 OCCUPANCY G: INDUSTRIAL
The Industrial buildings complied with Sections 5.2.1 and 5.2.2 shall be provided with the following active fire
protection:
5.9.1 Occupancy G1: Low Hazard Industries
Manually operated electric fire alarm system shall be installed with portable fire extinguishers or hydrants when
occupant loads are not more than 150.
Where occupant loads are more than 150 active fire protections shall be performance based.
5.9.2 Occupancy G2: Moderate Hazard Industries
Among the moderate hazard industries where large number of occupants are densely populated in a building, the
active fire protections shall be performance based. Fire safety requirement for such type industry is elaborated
as follows:
(a) Where occupancy load is more than 150 per production area shall have minimum 9.5 m3 air volume per
occupant.
(b) There shall have direct exits from the ground floor. This exit doors shall be used by only the occupant of
the ground floor.
(c) Buildings less than 33 m height shall have open stair and the interior stairs shall be protected by fire rated
enclosures. Occupants located 33 m or above, all stair shall have smoke proof enclosures constructed as
per provision of the Code.
(d) All windows or openings on exterior walls passable by occupant located above 3 m in height shall be
protected by grills and all these grills shall be designed as such that a part or a portion having minimum
o.6 m height and minimum 0.75 m width framed and the grill within the frame shall be side hinged or
pivoted so that it can swing. This swing type operable portion must be always locked and in case of
emergency the firefighters can open by breaking the lock for rescue operation.
(e) The floor shall be constructed such that the travel path of the occupant shall not be exceeded as per
Table 4.3.7 of this Code.
(f) As per general requirements, all exit access doors shall be of a side-swinging type. Fulfilling the conditions
laid down by NFPA 101, edition 2015, article 7.2.1.4 horizontal sliding or vertical-rolling security grills or
door assemblies that are part of the required means of egress shall be permitted.
(g) All raw materials, finished good and accessories shall be stored in control areas as per provision of part 3.
(h) Density of storage materials per control area shall not be exceeded the provision of this Code.
(i) During production that is feeding, checking for quality control rejects, waiting area for finishing, packing,
cartooning etc. in every case dedicated area shall be defined as on process storages. The total volume of
materials on process shall be such that in every four hour the material shall be used up and the finished
goods shall be transferred to controlled area as finished goods store.
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(j) From each end every work station shall be connected with a passage. The width of the passage shall
comply with the provision of this Code Chapter 3 Part 4.
(k) Cargo lift and passenger lift shall have smoke proof lift lobby.
(l) Occupant load in a single effective undivided space shall not exceed 600. In case of existing building if the
occupant load of a single effective undivided space exceeds 600, the space shall be compartmented
complying with the horizontal exit provision of the Code.
(m) Where control areas and in process stores having materials may cause a fire classified as fire class A shall
have hydrant system as per provision of this Code. In the utility occupancy areas fire extinguishing system
shall be installed as per provision as specified for utilities of this Code.
(n) If there any change of fire classification due to the working condition or raw materials than appropriate
extinguishing system shall be installed as per provision of this Code.
(o) Up to 750 m2 single effective undivided space in a floor shall be installed with manual fire alarm system
with portable fire extinguishers or as an alternate hydrants system shall be installed as per provisions of
this Code.
(p) Above 750 m2 single effective undivided space in a floor shall be fitted with manual fire alarms system
with hydrants shall be installed.
5.10 OCCUPANCY H: STORAGE
The Storage buildings complied with Sections 5.2.1 and 5.2.2 shall be provided with the following Active fire
protection:
5.10.1 Occupancy H1: Low Fire Risk Storage
Manually operated electric fire alarm system shall be installed. Depending on the type of materials to be stored
performance based fire protection shall be installed as per provision of this Code.
5.10.2 Occupancy H2: Moderate Fire Risk Storage
Performance based fire protection system shall be installed as per provision of this Code.
5.11 OCCUPANCY I: ASSEMBLY
The Assembly buildings complied with Sections 5.2.1 and 5.2.2 shall be provided with the following Active fire
protection:
5.11.1 Occupancy I1: Large Assembly with Fixed Seats
All auditorium, corridor, green rooms and canteen attached to assembly buildings shall be fitted with manual fire
alarm system and the performing stage should preferably be covered by an automatic sprinkler system. Portable
firefighting appliances shall be installed as per specification of the manufacturer and provision of this Code.
5.11.2 Occupancy I2: Small Assembly with Fixed Seats
Requirements specified in Sec 5.6.1 shall be complied.
5.11.3 Occupancy I3: Large Assembly without Fixed Seats
Automatic fire alarm system shall be provided. Portable firefighting appliances shall be installed as per
specification of the manufacturer and provision of this Code.
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5.11.4 Occupancy I4: Small Assembly without Fixed SeatsBNBC 2015 FINAL DRAFT
Requirements specified in Sec 5.6.3 shall be complied.
5.11.5 Occupancy I5: Sports Facilities
Manually operated electric fire alarm system shall be provided. Portable firefighting appliances shall be installed
as per specification of the manufacturer and provision of this Code.
5.12 OCCUPANCY J: HAZARDOUS
The Hazardous buildings complied with Sections 5.2.1 and 5.2.2 shall be provided with the following Active fire
protection:
All hazardous occupancies shall be installed with automatic fire alarm and automatic fixed firefighting gaseous or
foam or dry chemical extinguishing system as compatible with class of fire shall be installed as per provision of
this Code.
5.13 OCCUPANCY K: GARAGES
The parking buildings (garages) complied with Sections 5.2.1 and 5.2.2 shall provide the following fire protections:
(a) Where both parking and repair operations are conducted in the same building, the entire building shall
comply with the requirement stated in this Code for Occupancy G1.
(b) Where the parking and repair sections are separated by not less than 1-hour fire-rated construction, the
parking and repair sections shall be permitted to be treated separately.
(c) In areas where repair operations are conducted, the requirement of Occupancy G1 shall be fulfilled.
(d) The area used only for parking shall fulfill the requirement as laid down in chapter 42 of NFPA 101 edition
2015.
5.14 OCCUPANCY L: UTILITIES
Fire protection system shall be as stated in Sec 2.12 of this Code
5.15 OCCUPANCY M: MISCELLANEOUS
Performance based fire protection system shall be installed.
Bangladesh National Building Code 2015 4-53
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4-54 Vol. 1
Appendix A
Guidelines for Fire Drill and
Evacuation Procedure
A.1 INTRODUCTION
The following provisions shall be applicable for emergency reporting, fire safety and evacuation plan of the
occupants of different occupancies.
A.2 FIRE REPORTING
Any occupant within the occupancy discovering a fire or smoke shall immediately report the incident to the fire
brigade directly or through the ground command station, if there is any. Reporting of this situation shall not be
delayed by any person by way of making, issuing, posting or maintaining any regulation or order written or
verbal to that effect.
BNBC 2015 FINAL DRAFT
A.3 SUPERVISION OF FIRE SAFETY AND EMERGENCY ACTION AND PLANS
The owner shall designate competent persons to act as fire safety and evacuation plan staff, train the staff and
conduct fire drill. Such persons shall possess such qualifications and/or hold such certificate of fitness as are
required by the provisions of this Chapter. The owner shall ensure that adequate fire safety and evacuation plan
staff is present on the premises during regular business hours and other time when the building is occupied, to
perform the duties and responsibilities set forth in the fire safety and evacuation plan.
A.4 FIRE SAFETY STAFF
A.4.1 The fire safety and evacuation plan shall designate a fire safety director, a number of deputy fire safety
directors and fire safety brigade members having following duties, authority and qualifications.
A.4.2 Fire Safety Director
(a) The fire safety plan shall contain the name of fire safety director, whether employed by a fire security firm
or directly employed by the management.
(b) Depending on the size and complexity of the building, the Fire Safety director shall be a person of proven
capability, having good training and schooling with adequate experience in dealing with fire.
(c) The fire safety director shall be present in the building during regular business hours. Duties of Fire Safety
director shall primarily include but not be limited to the following.
(i) Shall be well conversant with the written fire safety plan for the fire drill and evacuation procedures.
(ii) Shall be in charge of selecting qualified building service employees for the fire command and engage in
organizing, training and supervising the works of command crew.
(iii) Shall be responsible to conduct fire and evacuation drill.
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Fire Protection
(iv) Shall be responsible for the availability and state of preparedness of fire command crew during
emergencies.
(v) Shall be responsible for the assignment and training of Fire fighters on floor supported by adequate
number of deputies as detailed out in the fire safety plan.
(vi) Shall be responsible for the day to day supervision of the fire fighters and his deputies and the state of
alertness of the fire fighters. When the number of fire fighters and deputies become such that it
becomes impractical for the chief fire safety officer to check them directly during the working hours,
he may provide substitute. Nonetheless the fire safety director shall spot check any number of floors
as he wishes or time permits. An up to date organization chart shall be displayed at appropriate
locations.
(vii) Cases of negligence to duties on the part of members of his crew shall be taken up by him and he shall
rectify the situation by appropriate measures as far as he has been empowered under the fire safety
plan, failing which he shall notify the matter to the owner or the management of the building. The
owner or the management on their part shall take up the matter with the fire security firm or if
employed directly shall deal with the matter directly. If the person/persons is/are employed by a firm,
and the firm fails to correct the situation, the owner/management shall notify the matter to the
Department of Fire Service and Civil Defence to take disciplinary action against the firm.
(viii) In the event of fire/emergency he/she shall be in charge of fire command station and shall supervise,
guide and coordinate activities such as ensuring that the Department of Fire Service and Civil Defence
has been notified of fire or fire alarm, direct the evacuation procedure as detailed in the fire safety
plan, manning the fire command station, appraise the Department of Fire Service and Civil Defence
about the spot of fire on their arrival, advise the Department of Fire Service and Civil Defence officer in
charge of the operation.
A.4.3 Fire Safety Deputy Director
The fire safety plan shall contain the details of Deputy Fire Safety Director similar to the details mentioned
under the fire safety director. Qualification and experience of Deputy Fire Safety Director shall also be similar to
those of the Fire Safety director excepting that he shall be less experience than the Director.
Tenant or tenants of each floor upon request by the owner or in-charge of the building shall assign and make
available dependable and trustworthy person/persons under their employee at the disposal of the Director to
act as fire safety coordinator and fire fighter. They shall undergo basic firefighting and evacuation training by the
Director or his deputy.
Duties of the Deputy Fire safety Director shall be similar to those mentioned under Sec A.4.2 except that he shall
receive command from the Fire Safety director for execution and shall assume the role of Fire Safety director in
his absence.
Each floor of a building shall be under the command of a deputy fire director for the safe evacuation of inmates
in the case of fire. When the floor area of a tenant exceeds 700 m2 a deputy fire director shall be assigned for
each 700 m2 or part thereof.
The deputy fire safety director shall be present in the building at all times. Duties of deputy Fire Safety director
shall primarily include but not be limited to the following
(a) Each Deputy Fire Safety director shall be conversant with the fire safety plan. They must be well acquainted
with fire exits and location and operation of fire alarms.
(b) In case of fire or fire alarm, the deputy Fire Safety director shall ascertain location of fire and unfold
evacuation procedure as directed from the command station and to the following general guides.
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(i) The most critical area for immediate evacuation would be the fire floor and the floors above.BNBC 2015 FINAL DRAFT
Evacuation from other floors shall be initiated if so commanded by the ground command station or the
situation indicates to be so. Evacuation should be carried out via stairs not influenced by fire and fire
fighter shall try to carry out the operation using stair other than the ones used by the Department of
Fire Service and Civil Defence personnel. If it becomes impossible, the fighters before opening door to
the fire floor shall sought advice from the Department of Fire Service and Civil Defence personnel.
(ii) Evacuation from two or more floors below the fire floor should be adequate. He shall continuously keep
the ground command station informed of his location.
(iii) Ensure that fire alarm has been transmitted.
(iv) Fire fighters shall ensure that all the inmates are intimated of the emergency and shall immediately
proceed with the evacuation exercise detailed under Fire Safety Plan.
(v) Fire fighter shall keep the ground station informed of the step being taken by him/her.
(vi) Similarly fire fighter above fire floor shall notify the command station of the means being taken by
him/her or any other special feature after unfolding Fire Safety Plan.
(vii) If and when stairways serving fire floor/floors above become useless by the presence of fire, smoke,
fumes, in several floors above and when fire engulfs a considerable number of inmates then use of
elevators shall be considered in accordance with the followings:
·If the elevator serving the floor to be evacuated also serves the fire floor, the lifts shall not be used
if it is not fire lift. If there are more than one lift bank, however, the lift/lifts in the other bank may
be used if notified by the ground command station that one may use such lift/lifts.
·If the lifts do not serve the fire floor or lift shaft has no opening on the fire floor, they may be used
if not otherwise instructed by the command station.
·Elevators taken over by trained in-house person or Department of Fire Service and Civil Defence
personnel may be used.
·In absence of unaffected available lift/lifts, Fire fighter shall decide to use the fire stair for
evacuation based on considerations/information available on the floor and any other instruction
received from ground command. Before entering the fire stairway with the evacuees, the Fire
fighter shall be sure about the environment within the fire stairway by personal inspection and in
case of adverse environment consider using an alternate stairway and shall notify the ground
command accordingly.
·The Fire fighter shall keep the ground command informed of the means adopted by him during the
evacuation process.
A fire safety coordinator and fire fighter shall be available at all times other than normal working hours when
the Fire Safety Director or his Deputy is not available within the building.
Fire safety coordinator shall be a person capable of directing the evacuation procedure of occupants within the
buildings as detailed in the Fire Safety Plan.
During fire/emergencies, primary function of fire safety coordinator shall be to take over command of the
ground station and to direct and execute the evacuation process as laid down in the plan.
Fire safety coordinator shall be trained by the Director and shall be under his command for all evacuation
purposes. His activities shall be controlled and governed by the clauses in Fire Safety Plan and shall be subject to
scrutiny of the Department of Fire Service and Civil Defence.
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Fire Protection
Fire Party: If, in the opinion of the Fire Safety Director and endorsed by the Department of Fire Service and Civil
Defence that the number of fighter, coordinator and Deputy are inadequate, a Fire Party shall be raised from
among the employees of the tenants and the management who shall be acting as help to regular in-house fire
fighting force in the event of fire and follow the same work schedule and function in the same manner as
fighter, coordinator and Deputy fire safety director do.
A.5 SIGNS AND FLOOR PLANS
A.5.1 The lettering, arrows and other symbols of exit signs shall be written with vernacular alphabets high
contrast background as per NFPA 170. Words on the signs shall be at least 150 mm high with a stroke of not less
than 20 mm. For vernacular alphabets and numerics at least 150 mm high with stroke of not less than 20 mm.
The sign/signs may be posted directly above the call button of the lift or any other conspicuous location securely
attached to the surface of the wall. The top of the sign shall not be more than 2 m above floor level.
Sign shall be posted and maintained in front of the landing area of lifts on all floors that occupants may not miss,
which shall direct the occupants to use stairs and not lifts during emergencies/fires, if not directed otherwise
and shall also contain a floor plan with exact location of the stair and the relative position between the sign and
the stair. Such posting in front of the landing area of lifts shall be omitted only if such signs are posted on all
floors and some other area conspicuously located with the same message inscribed on it.
A.5.2 Sign Depicting Floor Number
A sign shall be posted and maintained on each stair enclosure preferably on the wall of the intermediate landing
which in actual fact shall be half storey more or less than the actual indicating the floor number. The number
shall be at least 75 mm square and in vernacular alphabets with contrast background as per NFPA 170.
A.5.3 Stairs and Elevators Identification
Each stair and Elevator shall be identified by a vernacular alphabet and posted with a sign, securely placed
preferably on the wall of the stair side of the lift door from which egress is to be made.
A.5.4 Stair re-entry Provision
A sign shall be posted and maintained on each floor within stairway and on the occupancy side of the stairway
where required, indicating whether re-entry is provided into the building and the floor where such re-entry is
provided.
A.5.5 Command Station
Command station on the ground floor shall be provided with a detailed floor plan of the entire building including
detailed locations of all first aid, firefighting equipment and other pertinent information. Command stations
shall be adequately illuminated.
A.5.6 Two Way Communications and Fire Alarm
A two way communication system between each floor and the command station on the lobby of the entrance
floor shall be provided and maintained by the owner of the building. Similarly fire alarm on each floor and the
command station shall be fitted and maintained.
A.6 FIRE SAFETY PLAN
A.6.1 A fire safety plan shall be developed in line with the details elaborated as below and must have the
approval of the local Department of Fire Service and Civil Defence regarding its adequacy.
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A.6.2 Fire safety plan elaborates the purpose and objective of the plan with details of personnel and their
duties and fire drilling and evacuation plan. In developing fire safety plan, evaluation of all individual floor
layout, total occupancy load on each floor, number and kinds of exits available, zoning of the floor by area and
occupancy shall be taken into consideration, careful evaluation of occupant movements and the most
expeditions routes to exit and alternate routes shall be identified and taken into consideration.
A.6.3 Fire safety plan starts with the location, address of the building with telephone number and details of
any other communication facilities available within the building.
A.6.4 Purpose of the plan is to delineate details of systematic safe and orderly evacuation of a part or whole
of the building by its occupants in case of fire/emergency in the shortest possible time to a safe area through
the safe means of egress. It also details out the use of in-built facilities of fire warning and firefighting like fire
alarm, first aid hose etc. to safeguard the lives of the inmates of the building.
A.6.5 Objective of the plan is to provide continued education to the inmates and the fire command personnel
and keep the people oriented to the in-built equipment in readiness to act in the event of fire. The plan shall be
rehearsed through fire drill and the written plans containing instruction shall be updated if needed and use of
the in-built equipment along with initiating fire safety procedure to safeguard life in case of fire until the fire
brigade arrives.
A.6.6 Once the plan is accorded after approval by the Department of Fire Service and Civil Defence, the plan
shall be distributed to all the tenants of the building by the building management, including the employees of
the tenants and employees of the management.
A.6.7 If the building is owned by an individual or a single corporate body and the owner or right holding
member/members of the corporate body are residing in the building shall be equally subject to fire safety plan
applicable to other tenants.
A.6.8 All major changes in the safety plan shall be promptly reported to Department of Fire Service and Civil
Defence for their approval.
BNBC 2015 FINAL DRAFT
A.7 FIRE DRILLS
A.7.1 Fire drill shall be conducted as detailed under the fire safety plan. The frequency of fire drill shall be as
per table shown below. All occupants of the buildings, building service employees including fire safety and
evacuation plan staff shall participate in the fire drill. However, the very old, convalescent patients or otherwise
incapacitated inmates are not obliged to actively take part in the exercise, except the fire man and his staff and
family members of such person shall chalk out a clear plan as to how to evacuate in a real emergent situation
with such incapacitated persons.
A.7.2 A record of such drills shall be kept in writing for at least 3 years for the inspection Department of Fire
Service and Civil Defence whenever called for. The frequency of such fire drill shall be as mentioned in
Table 4.A.1.
Table 4.A.1: Fire Drill Frequency
Occupancy Frequency
Industry Having occupancy more than 150 Monthly
Industry Having occupancy less than 150 Quarterly
Mercantile occupancy more than 150 Quarter
Mercantile occupancy less than 150 Half yearly
School, College, Universities Half yearly
High rise building Half yearly
Tall building Quarterly
Bangladesh National Building Code 2015 4-59
BNBC 2015 FINAL DRAFTPart 4
Fire Protection
A.8 ORGANIZATION CHART FOR FIRE DRILL AND EVACUATION ASSIGNMENT
(a) An organization chart clearly delineating assignment attributed to designated employees shall be prepared
as per fire safety plan and posted to all tenants and in very conspicuous location/locations on each floor. A
copy of the chart shall be in possession of the fire safety director.
(b) An updated list shall be continuously made available with the director, his deputy and coordinators and Fire
fighter for all the disabled occupants unable to move without aid in the stairs. Arrangement shall be made
in detail in the fire safety plan to have these inmates assigned in moving down the stairs two or more floors
below fire floor. If it becomes necessary to move them still further down the stair, help may be sought of
the elevator bank unaffected by fire and evacuated safely to ground floor. In case any extra assistance is
needed, the director shall be notified.
(c) During fire or fire drill exercise, fire fighter shall be using arm band or such other identification.
(d) During fire on the fire floor it is to be ensured that all inmates are notified and are evacuated to safe area. A
rush search shall be carried out including lavatories that all the inmates have been covered and the person
in charge of this operation shall be trained in accomplishing this task fast and flawless.
(e) Persons not available on duty as per organization chart shall be promptly replaced as per contingency plan
detailed in the fire safety plan.
(f) On completion of evacuation operation, a head count shall be carried out of all the regular occupants
known to have occupied the floor evacuated.
(g) Immediately on receipt of the alarm, the fire fighter shall take position near the two way communication
station on the floor, so that he/she can maintain continuous contact with the ground command and receive
instructions.
A.9 INSTRUCTION TO INMATES OF THE BUILDING
Once the fire safety plan has been approved by the Department of Fire Service and Civil Defence, the applicable
portion of the plan shall be distributed to all the tenants and the management of the building who in turn shall
pass it on the their respective employees. All the occupants shall actively participate and cooperate in carrying
out the provisions of fire safety plan.
A.9.1 Fire Prevention and Protection Program
A Plan for periodic formal inspection of each floor shall be developed in respect of exit facilities, fire
extinguishers and good housekeeping. Reports of such inspection shall be carefully maintained for inspection of
Department of Fire Service and Civil Defence. The Plan shall have provision for monthly testing of two way
communication and fire alarm system.
A.9.2 Personal Fire Instruction Card
All the occupants of the building shall be supplied with a personal Fire Instruction Card containing details of the
floor plan and exit routes as well as instruction to be followed during fire. Instructions may contain the following
either in Bangla or both in Bangla and English.
A.9.3 Detailed Building Information
A form shall be maintained for the benefit of all concerned with fire hazard of the building and shall contain the
following basic information.
(a) Building address in adequate details about its location.
(b) Name, Address and telephone number of the owner (corporate body or individual) and the person in
charge of the building.
4-60 Vol. 1
Guidelines for Fire Drill and Evacuation Procedure Appendix A
(c) Name address and telephone number if any, of the Fire Safety Director and his Deputy.BNBC 2015 FINAL DRAFT
(d) Certificate of occupancy.
(e) Height, area, construction class (details of various load and non-load bearing elements).
(f) Number, type and location of fire stairs and/or fire towers.
(g) Number, type and location of horizontal exits or other refuge areas.
(h) Number, type location and operation of elevators and escalators (if any).
(i) Locations of fire alarm-floor wise and central.
(j) Communication System (telephone, mobile, walkie-talkie).
(k) Size and location of stand pipe system, gravity or pressure tank, fire pump and the name and
qualifications of the person or persons in charge of the facilities.
(l) Automatic fire sprinkler system, primary and secondary water supply system and the area or areas
being protected along with the name and qualification of the person or persons in charge.
(m) Any other fire extinguishing system, their location, efficacy and other pertinent details.
(n) Average number of employed persons by day and night.
(o) Average number of disabled persons visiting the building by day and night.
(p) Average number of outsiders visiting the building by day and night.
(q) Locations, types and capacities of other service facilities like primary and standby electric power,
normal and emergency lighting arrangement, heating with fuel (if any), ventilation with fixed windows,
other means of emergency exhaust facilities of smoke and heat, air-conditioning system including floor
coverage and ducting, refuse disposal facilities, any other firefighting equipment, any other service
facilities available.
(r) Measures taken or to be taken for addition, alteration and repair of any aspect within the buildings.
(s) Information on flammable solids, liquids and gases if used and stored within the building premises.
(t) In mixed occupancy, complete details of such occupancies and their special needs to be covered during
fire or emergencies.
A.10 ENGLISH TEXT OF INSTRUCTIONS
(a) Safety First
·Push button fire alarm boxes (number is mentioned here) are provided on your floor. Please read the
operating instruction posted on them.
·Please read the operating instructions on the body of the fire extinguisher provided in your floor.
·Nearest exit from your flat is shown in this plan (plan to be provided here).
·Assemble on the ground floor at the location indicated on the following plan. For clarification, contact
the fire fighter or Deputy Safety Director. (plan of assembly point in ground floor to be provided here)
(b) For personal and collective safety, notify the fire fighter/Deputy Safety Director in case.
·Exit route and/or door are obstructed by dumping of boxes or such other loose materials.
·Staircase door, lift lobby doors do not close automatically or completely.
·Push button fire alarm or fire extinguisher are obstructed or damaged or seem to be out of order.
(c) If you discover a Fire
·Break the glass and push the button of the nearest fire alarm and call the fire service.
·With assistance from the floor fire fighter if needed, fight fire with the in-built facilities on your floor.
·Evacuate, if so instructed by the fire fighter
Bangladesh National Building Code 2015 4-61
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(d) When you hear Evacuation Instructions
·Immediately leave the floor taking the nearest staircase.
·Report to your fire fighter on reaching the predetermined assembly point outside the building.
·Try not to use lifts.
·Avoid going to cloak room.
·Refrain from running or shouting, do not get panicked.
·Do not waste a moment collecting personal belongings.
·Keep the lift lobby and staircase doors shut.
A.11 BANGLA TEXT OF INSTRUCTIONS (evsjvq wb‡`©kvejx)
(K) wbivcËvB me©v‡MÖ
·fe‡bi cÖwZ Zjvq Pvc †evZvg wewkó AwMœ wec` ms‡KZ hš¿ †`qv Av‡Q| e¨env‡ii c~‡e© h‡š¿i Mv‡q gyw`Zª
wb‡`©kvejx cob– |
·AwMœwbev© cb hš¿ e¨env‡ii c‡~ e© AbyMÖn K‡i h‡ši¿ Mv‡q gyw`Zª wb‡`©kvejx cob– |
·fe‡bi ‡h ¯v’ ‡b Avcwb Ae¯v’ b Ki‡Qb †mLvb †_‡K wbMg© ‡bi wbKUZg/mnRZg c_ L‡yu R †c‡Z wbM©gb bKkv
Abymib Kiæb|
·wbM©g‡bi mwy eav‡_© fe‡bi wbPZjvq wbMg© b bKkv wb‡`w© kZ ¯v’ ‡b mg‡eZ nDb I AwMœwbev© cb Kgx© i wb‡`©kbv
Abmy ib Kiæb|
(L) Avcbvi e¨w³MZ I mvgwMÖK wbivcËvi ¯v^ ‡_© wb‡¤œ D‡jøwLZ wel‡q AwMwœ bev© cK Kg©x‡K AewnZ Kiæb
·Riæix wbM©gb c‡_ †Kvb cÖKvi evav _vK‡j|
·wmwoN‡ii `iRv, wjdU& jwei `iRv m¤úb~ f© v‡e ev mswµqfv‡e eÜ bv n‡j|
·AwMœwbev© cb wec` ms‡KZ hš¿ I AwMwœ be©vcb hš¿ A‡K‡Rv ev e¨envi Dc‡hvMx bv _vK‡j|
(M) Av¸‡bi Drm Lu‡y R †c‡j
·wec` ms‡KZ h‡š¿i Kv‡Pi Aveib †f‡½ †djyb, †evZv‡g Pvc w`b Ges dvqvi mvwf©‡m Lei w`b|
·fe‡b iwÿZ AwMœ wbev© cK h‡ši¿ mvnv‡h¨ AwMœ wbev© c‡b mnvqZv Kiæb|
·AwMœ wbev© cb Kg©xi wb‡`©kbv ‡g‡b feb Z¨vM Kiæb|
(N) feb Z¨v‡Mi wb‡`©kbv †c‡j
·wbKUZg wmwo w`‡q `æª Z feb Z¨vM Kiæb|
·fe‡bi evB‡i Aew¯’Z wba©vwiZ mgv‡ek¯’‡j AwMœ wbe©vcb Kgx© ‡K Avcbvi Dcw¯’wZ AewnZ Kiæb|
·AwMœKv‡Ûi mgq wjdU& e¨envi Ki‡eb bv|
·AwMœKv‡Ûi mgq fxZmš¿¯Í n‡q A‡nZKz †`Šov‡`Šwo ev wPrKvi Ki‡eb bv|
·e¨w³MZ wRwbm msM‡Ö ni Rb¨ mgq bó Ki‡eb bv|
·wmwoN‡ii `iRv, wjd&U jwei `iRv eÜ ivLyb|
·cmÖ vab Kÿ e¨envi Kiv †_‡K weiZ _vKbz |
·¸R‡e Kvb †`‡eb bv, ¸Re Qov‡eb bv|
4-62 Vol. 1
Appendix B
Fire Protection Considerations for Venting in
Industrial and Storage Buildings
B.1 SCOPE BNBC 2015 FINAL DRAFT
B.1.1 This Appendix covers venting requirements in industrial buildings. Provisions contained herein shall be
applicable to factory and storage facilities requiring large floor areas without dividing walls and enclosures.
B.1.2 This Appendix shall not apply to ventilation designed for personnel comfort, commercial cooking
operation, regulating odor or humidity in toilet and bathing facilities, to regulate cooling equipment.
B.1.3 This Appendix shall apply to fire and smoke of two criteria: (a) Fire or smoke layer that does not
enhance the burning rate and (b) Deflagration.
B.2 VENTING OF FIRE AND SMOKE THAT DOES NOT ENHANCE THE BURNING RATE
B.2.1 Determination of precise venting requirements is difficult, as variables like rate of combustion,
composition of the combustion product, shape, size and packaging of the combustible materials as well the size,
height and disposition of the stacks of materials are involved with it.
B.2.2 Vent system designs shall be computed by calculating the vent area required to achieve a mass rate of
flow through the vent that equals the mass rate of smoke production.
B.2.3 Venting devices are to be so designed and installed that they operate automatically at the earliest sign
of fire or smoke.
B.2.4 The smoke and fire venting system shall be so designed and installed as to keep the temperature of the
combustion product as low as possible, preferably below 150oC.
B.2.5 To achieve full efficiency in vents total area of all vents must be more than the inlet area for cold air.
Ideally the inlets should be as close to the ground as possible.
B.2.6 The area of unit vent shall not exceed 2d2, where d is the design depth of the smoke layer. For vents
with length to width ratio more than two, the width shall not exceed the design depth of the smoke layer.
B.2.7 The center-to-center spacing of vents within a curtained area shall not exceed 2.8 H, where H is the
ceiling height. For different shape of the roof the ceiling height can be calculated as per provision of NFPA 204.
B.2.8 The spacing of vents shall be such that the horizontal distance from any point on a wall or draft curtain
to the center of the nearest vent, within a curtained area does not exceed 1.4 H.
B.2.9 The total vent area per curtained area shall be sized to meet the design objectives and the performance
objectives relative to the design fire or smoke, determined in accordance with NFPA 204.
B.2.10 The design of venting for sprinkled building shall be based on performance analysis acceptable to the
authority having jurisdiction, demonstrating that the established objectives are met.
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B.2.11 Smoke and heat venting systems and mechanical exhaust systems shall be inspected and maintained in
accordance with NFPA 204.
B.2.12 Venting systems are complement to fire extinguishing system. Where automatic sprinklers are installed
as fire extinguishing system, the sprinklers shall operate before the vent system comes into operation.
B.2.13 In industrial buildings exterior wall windows alone shall not be accepted as satisfactory means of
venting, but may be reckoned as additional means of venting when located close to the eaves and are provided
with ordinary glass or movable section arranged for both manual and automatic operation.
B.2.14 Vents shall be automatic in operation unless where designed specifically for both manual and automatic
operation.
B.2.15 Release mechanism of vent closure shall be simple in operation and shall not be dependent on electric
power.
B.2.16 The automatic operation of vents can be achieved by actuation of fusible links or other heat or smoke
detectors or by interlacing with the operation of sprinkler system or any other automatic fire extinguishing
system covering the area. The vents can be so designed as to open by counterweights utilizing the force of
gravity or spring loaded level following its release.
B.2.17 When vents and automatic sprinklers where installed together, sprinkler shall go into operation first
before vents open, in order to avoid delay in sprinkler operation.
B.2.18 Materials used in hinges, hatches and other related parts in vents shall be noncorrosive in nature for
long trouble free operation.
B.2.19 Vents shall be properly sited, at the highest point in each area to be covered.
B.2.20 If possible, vents shall be sited right on top of the probable risk area to be protected to ensure free and
speedy removal of smoke and other combustion product.
B.2.21 Minimum vent opening shall not be less than 1250 mm in any direction.
B.2.22 Vent spacing shall be designed considering the fact that higher number of smaller vents is better than
smaller number of large vents.
B.3 DEFLAGRATION VENTING
B.3.1 Deflagration is the propagation of a fire or smoke at a velocity less than the sound wave. When this
velocity of combustion increased beyond sound velocity then the combustion is said to be detonated and
explosion occurred with the rupture of an enclosure or a container due to the increase of internal pressure from
a deflagration.
B.3.2 The design of deflagration vents and vents closures necessitates consideration of many variables, only
some of which have been investigated in depth. No Venting recommendations are currently available for fast-
burning gases with fundamental burning velocities greater than 1.3 times that of propane, such as hydrogen.
Recommendations are unavailable and no venting data have been generated that addresses condition that fast-
burning gas deflagrations. The user is cautioned that fast-burning gas deflagrations can readily undergo
transition to detonation.
B.3.3 Deflagration venting is provided for enclosures to minimize structural damage to the enclosure itself
and to reduce the probability of damage to the other structures.
B.3.4 Venting shall be sufficient to prevent the maximum pressure that develops within the enclosure from
exceeding enclosure strength.
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Fire Protection Considerations for Venting in Industrial and Storage Buildings Appendix B
B.3.5 The vent area shall be distributed as symmetrically and as evenly as possible.BNBC 2015 FINAL DRAFT
B.3.6 The need for deflagration vents can be eliminated by the application of explosion prevention
techniques described in NFPA 69.
B.3.7 The vent closure shall be designed to function as rapid as is practical. The mass of the closure shall be as
low as possible to reduce the effects of inertia. The total mass of the moveable part of the vent closure
assembly shall not be exceeded 12.2 kg/m2.
B.3.8 When an enclosure is subdivided into compartments by walls, partitions, floors, or ceilings, then each
compartment that contains a deflagration hazard should be provided with its own vent closure(s).
B.3.9 It is possible to isolate hazardous operations and equipment outside of buildings with a pressure
resisting wall which will reduce risk of structural damage. Such operations and equipment may be housed in a
single storey building having appropriate venting facilities and a device to absorb explosion shock from blowing
through the duct back to the building.
B.3.10 Sometimes it may not be possible to house hazardous operations and equipment outside of the
building, in which case the separation from other parts and equipment shall be achieved by pressure resisting
walls and such units shall be ventilated outdoors. If suitable vents are integrated, external walls may be of heavy
construction or of heavy panel which may be blown off easily.
B.3.11 Unobstructed vent opening is the most effective pressure release vent structures.
B.3.12 Explosion relief vents may be provided with open or unobstructed vents, louvers, roof vents, hanger
type doors, building doors, windows, roof or wall panels or marble/fixed sash. Any or more than one of these
may be adopted depending on individual situations and requirements.
B.3.13 Roof vents covered with weather hoods shall be as light as possible and attached lightly, so that it is
easily blown off as and when an explosion occurs.
B.3.14 Doors and windows used as explosion vents shall be so fixed as to open outward. Doors shall be fitted
with friction, spring or magnetic, latches that function automatically at the slight increase in internal pressure.
B.3.15 Placed at the top or bottom, the hinged or projected movable sash shall be equipped with latch or
friction device to prevent accidental opening due to wind action or intrusion. Such latches or locks shall be well
maintained.
B.3.16 Venting shall be so planned as to prevent injury to inmates and damage to enclosure. In populated
locations, substantial ducts or diverts shall be provided to channelize the blast towards a pre-determined
direction.
B.3.17 If explosion are probable within the duct, they shall be equipped with diaphragm to rupture at
predetermined locations. The duct system shall not be physically connected to more than one collector.
B.3.18 Skylight with moveable sash that opens outward or fixed sash having panes of glass or plastic that blow
out readily under pressure from within can be used to supplement wall vents or windows, provided their
resistance to opening or displacement may be kept as low as possible consistent with structural requirement of
the building.
B.3.19 For equivalent explosion pressure release, larger closed vents will be required compared to open vents.
B.3.20 As far as possible hazardous areas shall be segregated be means of fire walls or party walls to prevent
spread of fire.
Bangladesh National Building Code 2015 4-65
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4-66 Vol. 1
Appendix C
Selection and Sitting of Fire Detection System
C.1 GENERAL BNBC 2015 FINAL DRAFT
This Appendix provides information for selection and sitting of equipment for fire detection in buildings.
C.2 CHOICE OF FIRE DETECTORS
Fire detectors may respond to any one manifestation of combustions such as heat generation, smoke and
flames.
Smoke detectors are not naturally suitable in places where the production process produces smokes.
Application of flame detectors are restricted due to the fact that all combustions do not necessarily accompany
flame and that clear line of sight is desirable as radiation from flames travel in straight lines for actuation of
sensitive element.
No single detector is able to meet the need of all types of fires and all types of occupancies. As such, based on
needs arising out of various situations and occupancies, judicious selection is extremely important for the
reduction of fire hazards.
C.2.1 Heat Detectors
"Point" or "Spot" type detectors are actuated by heat at layer adjacent to it over a limited area. "Line" type
detectors are sensitive to the effect produced by heated gas along any portion of the detector line. Both the
types operate on two broad principles: one, the heat sensitive elements is actuated by temperature rising
beyond a predetermined level; while the second system is actuated by predetermined rate of rise of
temperature.
C.2.2 Flame Detectors
Flame detectors are sensitive to radiation emitted by flames. Since heat, smoke and flame are produced during
a fire, detectors responding to all these are accepted as general purpose detectors.
Fixed temperature heat detectors are suitable for use where ambient temperatures are high and or may rise
and fall rapidly over a short period.
C.2.3 Rate of Rise Heat Detectors
These are suitable for use where ambient temperatures are low and/or may rise over a wide range slowly.
Abnormally sharp rise in temperature during a fire actuates this alarm. As such it cannot be used with
confidence where ambient temperatures reaches in the neighborhood of 40oC, but are best used where
ambient temperatures are in the range of about 40oC.
C.2.4 Smoke Detectors
Three types of smoke detectors are commonly used. First type is actuated by absorption or scattering of visible
or near-visible light by combustion product and known as "optical detector". The second type is actuated by the
Part 4 4-67
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BNBC 2015 FINAL DRAFTPart 4
Fire Protection
production on ionization current within the detector and referred to as "ionization detector". The third type is
sensitive to carbon monoxide or other products of combustion and is known as "chemically sensitive detector".
In general, these should be used at places where ambient temperature varies between 0o to 35oC.
C.2.4.1 Optical smoke detectors
Invisible smoke from a clear burning shall not actuate such detectors. But they respond quickly where smoke is
optically dense and as such suitable for use in dust free clean atmosphere. Over a period of time, due to dust
and dirt, the sensitive surface of photo sensitive element and/or executor lamp of optical detectors may loss its
efficiency and as such optical detectors should be cleaned and maintained regularly.
C.2.4.2 Ionization chamber smoke detectors
These responds quickly to invisible smoke of clear burning, but may not respond to fire producing dense smoke.
These can be used in dust free, humidity controlled area. Smoke and other fumes, dust including slow
accumulated and disturbed aerial dust, fiber, steam and condensation produced by normal processes and
vehicle engines may cause false alarm. Warehouses exposed to fast air flows can also cause false alarm. Burning
of polyvinyl chloride will not sensitize the detector in time and may provide late warning or no warning at all.
C.2.4.3 Chemically sensitive smoke detectors
Chemically coated sensitive elements react to carbon monoxide or other products of combustion present in
smoke. Dust or moisture adversely affects the sensitive elements and are not very suitable for residential use.
C.3 SITING OF DETECTORS
Considering the prevailing weather condition of the occupancies and the problem of false alarm, the type of
detectors and the area of coverage shall be decided. Area of coverage of detectors is dependent on many
factors. The following aspects shall be taken into considerations in the design of detectors.
·Various forms of overhead heating
·Exhaust air from air cooling equipment blowing out into the room or factory area
·Deep beams
·Roofs and ceiling of unusual shape
·Building with ground areas above 10 m and up to 30 m in height
·Staircases
·Canteen and Restaurants
·Plant Rooms
·Ambulant air currents
4-68 Vol. 1
PART 5 BNBC 2015 FINAL DRAFT
BUILDING
MATERIALS
PART 5
Chapter 1 SCOPE AND DEFINITIONSBNBC 2015 FINAL DRAFTPages
Chapter 2 BUILDING MATERIALS
5-1
5-3
TABLE OF CONTENTS
PART 5 BUILDING MATERIALS
Chapter 1 SCOPE AND DEFINITIONS BNBC 2015 FINAL DRAFT 5-1
1.1 SCOPE 5-1
1.2 TERMINOLOGY 5-3
5-3
Chapter 2 BUILDING MATERIALS 5-3
5-3
2.1 GENERAL 5-3
2.1.1 New or Alternative Materials 5-4
2.1.2 Used Materials 5-4
2.1.3 Storage of Materials 5-4
2.1.4 Methods of Test 5-4
5-4
2.2 MASONRY 5-5
2.2.1 Aggregates 5-5
2.2.2 Cement 5-6
2.2.3 Lime 5-6
2.2.4 Masonry Units 5-7
2.2.5 Mortar 5-7
2.2.6 Grout 5-7
2.2.7 Mortar for Ceramic Wall and Floor Tile 5-9
2.2.8 Metal Ties and Anchors 5-9
2.2.9 Reinforcement 5-9
2.2.10 Water 5-10
2.2.11 Applicable Standards for Masonry 5-10
5-10
2.3 CEMENT AND CONCRETE 5-11
2.3.1 General 5-12
2.3.2 Aggregates 5-13
2.3.3 Cement 5-13
2.3.4 Water 5-13
2.3.5 Admixtures 5-13
2.3.6 Metal Reinforcement 5-14
2.3.7 Applicable Standards 5-14
2.3.8 Concrete Pipe and Precast Sections 5-14
5-15
2.4 PRE-STRESSED CONCRETE 5-15
2.4.1 Concrete for Pre-stressed Concrete 5-15
2.4.2 Steel for Pre-stressed Concrete 5-15
5-15
2.5 BUILDING LIMES 5-16
2.5.1 Types of Lime 5-16
2.5.2 Properties of Lime 5-16
5-16
2.6 GYPSUM BASED MATERIALS AND PLASTER 5-16
2.6.1 Gypsum Board
2.6.2 Gypsum Plaster Vol. 1
2.6.3 Gypsum Veneer Plaster
2.6.4 Cement Plaster
2.7 FLOORING MATERIALS
2.7.1 General
2.7.2 Concrete/Terrazzo Tiles
2.7.3 Asphalt Tiles/Flooring
2.7.4 Mosaic Tiles
5-i
Part 5 BNBC 2015 FINAL DRAFT 5-16
Building Materials 5-16
5-17
2.7.5 Clay Tile 5-17
2.7.6 Vinyl Tiles 5-17
2.7.7 Rubber Tiles 5-19
2.7.8 Cast In-situ Floor Coverings 5-19
2.7.9 Other Flooring Materials 5-19
2.8 STEEL 5-21
2.8.1 Reinforcing Steel 5-23
2.8.2 Structural Steel 5-25
2.8.3 Steel Plate, Sheet and Strips 5-26
2.8.4 Steel Pipe, Tube and Fittings 5-27
2.8.5 Steel Bars, Wire and Wire Rods 5-28
2.8.6 Steel Fasteners 5-28
2.8.7 Welding Electrodes and Wires 5-29
2.9 TIMBER & WOOD PRODUCTS 5-29
2.9.1 Timber Types and Properties 5-31
2.9.2 Plywood 5-31
2.9.3 Particle Boards and Fibre Boards 5-31
2.9.4 Adhesives and Glues 5-32
2.10 DOORS, WINDOWS AND VENTILATORS 5-32
2.10.1 Plastic Doors and Windows
2.10.2 Metal Doors, Windows Frames and Ventilators 5-33
2.10.3 Wooden Doors, Windows and Ventilators
5-34
2.11 ALUMINIUM AND ALUMINIUM ALLOYS 5-35
5-35
2.12 BUILDERS HARDWARE 5-35
2.13 ROOF COVERINGS 5-36
5-36
2.13.1 Scope 5-36
2.13.2 Compatibility of Materials 5-36
2.13.3 Material Specifications and Physical Characteristics 5-36
2.13.4 Weather Protection 5-36
2.13.5 Wind Resistance 5-36
2.13.6 Structural and Construction Loads 5-36
2.13.7 Impact Resistance 5-36
2.13.8 Metal-Sheet Roof Coverings 5-37
2.13.9 Interlocking Clay or Cement Tile 5-37
2.13.10 Non-interlocking Clay or Cement Tile 5-37
2.13.11 Roof Insulation 5-39
2.13.12 Recovering and Replacement of Roof Coverings 5-39
2.13.13 Reuse of Materials 5-39
2.13.14 Applicable Standards 5-42
2.14 PAINTS AND VARNISHES 5-42
2.14.1 Water Based Paints and Pigments 5-42
2.14.2 Ready Mixed Paints, Enamels and Powder Coatings 5-42
2.14.3 Thinners and Solvents 5-43
2.14.4 Varnishes and Lacquers 5-48
2.15 SANITARY APPLIANCES AND WATER FITTINGS 5-49
2.15.1 Sanitary Appliances 5-49
2.15.2 Pipes and Pipe Fittings for Water Supply and Sanitation 5-49
2.15.3 Joints and Connections Between Pipes and Fittings 5-49
2.15.4 Taps and Valves 5-51
2.16 MISCELLANEOUS MATERIALS 5-51
2.16.1 Ferrocement
2.16.2 Plastics Vol. 1
2.16.3 Ballies and Wood Poles
2.16.4 Bamboos
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Building Materials 5-52
5-52
2.16.5 Fillers, Stoppers and Putties 5-53
2.16.6 Wire Ropes and Wire Products 5-55
2.16.7 Waterproofing and Damp-proofing Materials 5-56
2.16.8 Glazed Tiles and Tile-setting Mortars 5-58
2.16.9 Refractories 5-58
2.16.10 Thermal Insulating Materials 5-59
2.16.11 Screw Threads and Rivets 5-60
2.16.12 Sealants
2.16.13 Joints and Jointing Products 5-60
2.16.14 Glass and Glazing
2.17 CGI SHEET ROOFING AND WALLING
BNBC 2015 FINAL DRAFT
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5-iv Vol. 1
Chapter 1
SCOPE AND DEFINITIONS
1.1 SCOPE
This Part specifies the minimum requirements of materials to be complied with in buildings and works under the
provisions of the Code.
For each of the building materials the applicable standard specifications and test methods are listed. All materials
shall conform to these Standards.
The list of standards given in this Part of the Code would be augmented from time to time by amendments,
revisions and additions of which the Authority shall take cognizance. The latest version of a specification shall, as
far as practicable, be applied in order to fulfil the requirements of this Part.
In view of the limited number of Bangladesh Standards (BDS) for building materials available at the present time,
a number of standards of other countries have been referenced in this Code as applicable standards. As more
standards of BDS regarding building materials become available and adopted by amendment of this Code, they
shall supplement and/or replace the relevant standards listed in this Part.
BNBC 2015 FINAL DRAFT
1.2 TERMINOLOGY
This Section provides an alphabetical list of the terms used in and applicable to this Part of the Code. In case of
any conflict or contradiction between a definition given in this Section and that in Part 1, the meaning provided
in this Part shall govern for interpretation of the provisions of this Part.
ACTUAL DIMENSIONS Measured dimensions of a designated item.
ADMIXTURE
Material other than water, aggregate, or hydraulic cement used as an ingredient of
AGGREGATE concrete and added to concrete before or during its mixing to modify its properties.
AGGREGATE, LIGHT Granular material, such as sand, gravel, crushed stone, crushed brick and iron blast-
WEIGHT furnace slag, when used with a cementing medium that forms hydraulic cement
CONCRETE concrete or mortar.
Aggregate with a dry, loose weight of 11.25 kN/m3 or less.
CONCRETE, PLAIN
CONCRETE, PRECAST A mixture of Portland cement or any other hydraulic cement, fine aggregate, coarse
aggregate and water, with or without admixtures.
CONCRETE,
PRESTRESSED Concrete that does not conform to the definition of reinforced concrete.
CONCRETE,
REINFORCED Plain or reinforced concrete element cast separately before they are fixed in
position.
Reinforced concrete in which internal stresses have been introduced to reduce
potential tensile stresses in concrete resulting from loads.
Concrete containing adequate reinforcement, prestressed or non-prestressed, and
designed on the assumption that the two materials act together in resisting forces.
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FIBRE BOARD A fibre-felted, homogenous panel made from lignocellulosic fibres (usually wood or
cane) and having a unit weight between 1.6 kN/m3 and 5 kN/m3.
HARD BOARD A fibre-felted homogenous panel made of lignocellulosic fibres consolidated under
heat and pressure in a hot press to a density of 4.9 kN/m3 or above.
MASONRY UNIT Brick, tile, stone, glass-block or concrete-block used in masonry constructions.
MASONRY UNIT, Form of grouted masonry construction in which certain designated cells of hollow
GROUTED HOLLOW units are continuously filled with grout.
MASONRY UNIT, A masonry unit whose net cross-sectional area in every plane parallel to the bearing
HOLLOW surface is less than 75 percent of the gross cross-sectional area in the same plane.
MASONRY UNIT, SOLID A masonry unit whose net cross-sectional area in every plane parallel to the bearing
surface is 75 percent or more of the gross cross-sectional area in the same plane.
NOMINAL DIMENSIONS Nominal dimensions of masonry units are equal to their specified dimensions plus
the thickness of the joint with which the unit is laid.
PARTICLE BOARD A manufactured panel product consisting of particles of wood or combinations of
wood particles and wood fibres cemented together with synthetic resins or other
suitable bonding system by an appropriate bonding process.
BNBC 2015 FINAL DRAFT
PLYWOOD A built-up panel of laminated veneers.
REINFORCED MASONRY Form of masonry construction in which reinforcement acting in conjunction with
the masonry is used to resist designed forces.
REINFORCEMENT Reinforcing bars, plain or deformed, excluding prestressing tendons, bar and rod
mats, welded smooth wire fabric and welded deformed wire fabric used in
concrete.
REINFORCEMENT, Deformed reinforcing bars, bar and rod mats, deformed wire, welded smooth wire
DEFORMED fabric and welded deformed wire fabric.
REINFORCEMENT, PLAIN Reinforcement that does not conform to definition of deformed reinforcement.
REINFORCEMENT, Continuously wound reinforcement in the form of a cylindrical helix.
SPIRAL
STIRRUP Reinforcement used to resist shear and torsion stresses in structural member;
typically bars, wires, or welded wire fabric (smooth or deformed) bent into L, U or
rectangular shapes and located perpendicular to or at an angle to longitudinal
reinforcement. (The term "Stirrup" is usually applied to lateral reinforcement in
flexural members and the term "ties" to those in compression members).
STRUCTURAL GLUED Any member comprising an assembly of laminations of lumber in which the grain of
LAMINATED TIMBER all laminations is approximately parallel longitudinally in which the laminations are
bonded with adhesives.
TENDON Steel element such as wire, cable, bar, rod or strand, or a bundle of such elements,
used to impart prestress to concrete.
TIE A loop of reinforcing bar or wire enclosing longitudinal reinforcement.
YIELD STRENGTH The stress at which plastic deformation takes place under constant or reduced load.
5-2 Vol. 1
Chapter 2BNBC 2015 FINAL DRAFT
BUILDING MATERIALS
2.1 GENERAL
Materials used for the construction of buildings shall conform to standard specifications listed in this Part of the
Code. Any deviation from the type design or architectural detail from those specified in these standards may be
accepted by the Building Official as long as the materials standards specified therein are conformed with.
2.1.1 New or Alternative Materials
The provisions of this Part are not intended to prevent the use of any new and alternative materials. Any such
material may be approved provided it is shown to be satisfactory for the purpose intended and at least the
equivalent of that required in this Part in quality, strength, effectiveness, fire resistivity, durability, safety,
maintenance and compatibility.
Approval in writing shall be obtained by the owner or his agent before any new, alternative or equivalent
materials are used. The Building Official shall base such approval on the principle set forth above and shall
require that specified tests be made as per Sec 2.1.4 or sufficient evidence or proof be submitted, at the
expense of the owner or his agent, to substantiate any claim for the proposed material.
2.1.2 Used Materials
The provisions of this Part do not preclude the use of used or reclaimed materials provided such materials meet
the applicable requirements as for new materials for their intended use.
2.1.3 Storage of Materials
All building materials shall be stored at the building site(s) in such a way as to prevent deterioration or the loss
or impairment of their structural and other essential properties (Part 7 of this Code).
2.1.4 Methods of Test
Every test of material required in this Part, or by the Building Official, for the control of quality and for the
fulfillment of design and specification requirements, shall be carried out in accordance with a standard method
of test issued by the Bangladesh Standards and Testing Institution (BSTI). In the absence of Bangladesh
Standards, the Building Official shall determine the test procedures. Laboratory tests shall be conducted by
recognized laboratories acceptable to the Building Official.
If, in the opinion of the Building Official, there is insufficient evidence of compliance with any of the provisions
of the Code or there is evidence that any material or construction does not conform to the requirements of this
Code, the Building Official may require tests to be performed as proof of compliance. The cost of any such test
shall be borne by the owner.
The manufacturer or supplier shall satisfy himself that the materials conform to the relevant standards and if
requested shall furnish a certificate or guarantee to this effect.
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2.2 MASONRY
2.2.1 Aggregates
Aggregates for masonry shall conform to the standards listed as follows: ASTM C144 Aggregates for Masonry
Mortar; ASTM C404 Aggregates for Masonry Grout; ASTM C331 Lightweight Aggregates for Concrete Masonry
Units (the applicable Standards for masonry are listed at the end of this Section).
2.2.2 Cement
Cement for masonry shall conform to the standards listed as follows: BDS EN 197-1: 2003 Cement Part-1
Composition, specifications and conformity criteria for common cements; or ASTM C150/C150M Portland
Cement; ASTM C91 Masonry Cement; ASTM C595/C595M Blended Hydraulic Cements.
2.2.3 Lime
Limes for masonry shall conform to the standards listed as follows: ASTM C5, Quicklime for Structural Purposes;
ASTM C207, Hydrated Lime for Masonry Purposes.
2.2.4 Masonry Units BNBC 2015 FINAL DRAFT
(a) Clay: Masonry units of clay (or shale) shall conform to the standards listed as follows: BDS 208: 2009,
Common building clay bricks; BDS 1249:1989, Acid resistant bricks; BDS 1250: 1990, Burnt clay facing bricks;
BDS 1263: 1990, Burnt clay hollow bricks for walls and partitions; BDS 1264 : 1990, Glossary of terms
relating to structural clay products; BDS 1432: 1993, Burnt clay perforated building bricks; BDS 1803: 2008,
Specification for hollow clay bricks and blocks; ASTM C34 Structural Clay Load-Bearing Wall Tile; ASTM C212
Structural Clay Facing Tile; ASTM C56 Structural Clay Non-Load-Bearing Tile; and IS 7556 Burnt clay jallies.
(b) Concrete: Concrete masonry units shall conform to the standards listed as follows:
BDS EN 771-3: 2009 Specification for masonry units - Part: 3 Aggregate concrete masonry units
BDS EN 772-1: 2009 (dense and lightweight aggregates).
BDS EN 772-2: 2009
BDS EN 772-6: 2009 Methods of test for masonry units - Part 1: Determination of compressive
BDS EN 772-11: 2009 strength.
BDS EN 772-13: 2009 Methods of test for masonry units - Part 2: Determination of percentage
BDS EN 772-14: 2009 area of voids in masonry units (by paper indentation).
BDS EN 772-16: 2009
BDS EN 772-20: 2009 Methods of test for masonry units - Part 6: Determination of bending
BDS EN 1052-3: 2009 tensile strength of aggregate concrete masonry units.
Methods of test for masonry units - Part 11: Determination of water
absorption of aggregate concrete, autoclaved aerated concrete,
manufactured stone and natural stone masonry units due to capillary
action and the initial rate of water absorption of clay masonry units.
Methods of test for masonry units - Part 13: Determination of net and
gross dry density of masonry units (except for natural stone).
Methods of test for masonry units - Part 14: Determination of moisture
movement of aggregate concrete and manufactured stone masonry units.
Methods of test for masonry units - Part 16: Determination of dimensions.
Methods of test for masonry units - Part 20: Determination of flatness of
faces of masonry units.
Methods of test for masonry - Part 3: Determination of initial shear strength
BDS EN 1745: 2009 Masonry and masonry products - Methods for
determining design thermal values.
5-4 Vol. 1
Building Materials Chapter 2
ASTM C55 Concrete Building Bricks.
ASTM C90 Specification for Load-Bearing Concrete Masonry Units.
ASTM C129 Non-Load Bearing Units.
(c) Others BNBC 2015 FINAL DRAFTCalcium Silicate Face Brick (Sand-Lime Brick) shall conform to ASTM C73
Calcium Silicate Standard Specification.
Glazed Masonry Units
Glazed Masonry building units shall conform to the standards listed as
Glass Block follows: ASTM C126, Ceramic-Glazed Structural Clay Facing Tile, Facing Brick,
Un-burnt Clay Masonry and Solid Masonry Units; or ASTM C744 Prefaced Concrete and Calcium
Units Silicate Masonry Units.
Architectural Terra Cotta
Glass block may be solid or hollow and contain inserts; all mortar contact
Natural Stone surfaces shall be treated to ensure adhesion between mortar and glass.
Cast Stone Masonry of un-burnt clay units including cement stabilized and lime stabilized
blocks shall not be used, in any building more than one storey in height.
AAC Masonry
Ceramic tile All architectural terra cotta units shall be formed with a strong homogeneous
Second Hand Units body of hard-burnt weather-resistant clay which gives off a sharp metallic ring
when struck. All units shall be formed to engage securely with and anchor to
the structural frame or masonry wall.
Natural stone for masonry shall be sound and free from loose friable
inclusions. Natural stone shall have the strength and fire resistance required
for the intended use.
All cast stone shall be fabricated of concrete or other approved materials of
required strength, durability and fire resistance for the intended use and shall
be reinforced where necessary.
AAC (Autoclaved Aerated Concrete) masonry units shall conform to ASTM
C1386 for the strength class specified.
Ceramic tile shall be as defined in, and shall conform to the requirements of
ANSI A137.1.
Second hand masonry units shall not be used unless the units conform to the
requirements for new units. The units shall be of whole, sound material and
be free from cracks and other defects that would interfere with proper laying
or use. All old mortar shall be cleaned from the units before reuse.
2.2.5 Mortar
Mortar shall consist of a mixture of cementitious material and aggregates to which sufficient water and
approved additives, if any, have been added to achieve a workable, plastic consistency. Cementitious materials
for mortar shall be one or more of the following: lime, masonry cement, Portland cement and mortar cement.
Mortar for masonry construction other than the installation of ceramic tile shall conform to the requirements of
BDS 1303: 1990 Chemical resistant mortars; BDS 1304:1990 Methods of test for chemical resistant mortars;
ASTM C270, Mortar for Unit Masonry.
2.2.6 Grout
Grout shall consist of a mixture of cementitious materials and aggregates to which water has been added such
that the mixture will flow without segregation of the constituents. Cementitious materials for grout shall be one
or both of the following: Lime and Portland cement. Grout shall have a minimum compressive strength of 13
MPa. Grout used in reinforced and nonreinforced masonry construction shall conform to the requirements of
ASTM C476 Grout for Masonry.
Bangladesh National Building Code 2015 5-5
BNBC 2015 FINAL DRAFTPart 5
Building Materials
2.2.7 Mortar for Ceramic Wall and Floor Tile
Portland cement mortars for installing ceramic wall and floor tile shall comply with ANSI A 108.1-2005 listed in
Sec 2.2.11 and be of the composition specified in Table 5.2.1.
2.2.7.1 Dry-set leveling cement mortars
Premixed prepared leveling cement mortars, which require only the addition of water and are used in the
installation of ceramic tile, shall comply with ANSI A118.1. The shear bond strength for tile set in such mortar
shall be as required in accordance with ANSI A118.1. Tile set in dry-set Portland cement mortar shall be installed
in accordance with ANSI A108.5.
2.2.7.2 Latex-modified leveling cement mortar
Latex-modified leveling cement thin-set mortars in which latex is added to dry-set mortar as a replacement for
all or Part of the gauging water that are used for the installation of ceramic tile shall comply with ANSI A118.4.
Tile set in latex-modified leveling cement shall be installed in accordance with ANSI A108.5.
2.2.7.3 Epoxy mortar
Ceramic tile set and grouted with chemical-resistant epoxy shall comply with ANSI A118.3. Tile set and grouted
with epoxy shall be installed in accordance with ANSI A108.6.
2.2.7.4 Furan mortar and grout
Chemical-resistant furan mortar and grout that are used to install ceramic tile shall comply with ANSI A118.5.
Tile set and grouted with furan shall be installed in accordance with ANSI A108.8.
2.2.7.5 Modified epoxy-emulsion mortar and grout
Modified epoxy-emulsion mortar and grout that are used to install ceramic tile shall comply with ANSI A118.8.
Tile set and grouted with modified epoxy-emulsion mortar and grout shall be installed in accordance with ANSI
A108.9.
2.2.7.6 Organic adhesives
Water-resistant organic adhesives used for the installation of ceramic tile shall comply with ANSI A136.1. The
shear bond strength after water immersion shall not be less than 275 kPa (40 psi) for Type I adhesive and not
less than 138 kPa (20 psi) for Type II adhesive when tested in accordance with ANSI A136.1. Tile set in organic
adhesives shall be installed in accordance with ANSI A108.4.
2.2.7.7 Portland cement grouts
Portland cement grouts used for the installation of ceramic tile shall comply with ANSI A118.6. Portland cement
grouts for tile work shall be installed in accordance with ANSI A108.10.
2.2.7.8 Mortar for Autoclaved Aerated Concrete (AAC) masonry
Thin-bed mortar for AAC masonry shall comply with Article 2.1 C.1 of TMS 602/ACI 530.1/ASCE 6. Mortar used
for the leveling courses of AAC masonry shall comply with Article 2.1 C.2 of TMS 602/ACI 530.1/ASCE 6.
2.2.8 Metal Ties and Anchors
Metal ties and anchors shall conform to the standards listed as follows: ASTM A82/A82M, Wire Anchor and Ties;
and ASTM A1008/A1008M, Sheet Metal Anchors and Ties.
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Building Materials Chapter 2
Table 5.2.1: Ceramic Tile Mortar Compositions
Walls Scratch coat 1 cement, 0.20 hydrated lime*,
4 dry or 5 damp sand
Setting bed and leveling coat 1 cement, 0.50 hydrated lime,
5 damp sand to 1 cement,
1 hydrated lime; 7 damp sand
Floors Setting bed 1 cement; 0.10 hydrated lime;
5 dry or 6 damp sand; or 1
cement; 5 dry or 6 damp sand
Ceilings Scratch coat and sand bed 1 cement; 0.50 hydrated lime;
2.50 dry sand or 3 damp sand
* Lime may be excluded from the mortar if trial mixes indicate that the desired workability
and performance are achieved without lime.
2.2.9 Reinforcement
Reinforcement in masonry shall conform to the standards listed as follows: ASTM A82/A82M, Cold Drawn Steel
Wire for Concrete Reinforcement; ASTM A615/A615M, Deformed and Plain Billet Steel Bars; ASTM
A996/A996M, Rail-Steel Deformed and Plain Bars; ASTM A996/A996M, Axle-Steel Deformed and Plain Bars;
ASTM A706/A706M, Low-Alloy Steel Deformed Bars; ASTM A767/A767M, Zinc-Coated (Galvanized) Steel Bars;
and ASTM A775/A775M, Epoxy - Coated Reinforcing Steel Bars.
BNBC 2015 FINAL DRAFT
2.2.10 Water
Water used in mortar or grout shall be clean and free of deleterious amounts of acid, alkalis or organic material
or other harmful substances.
2.2.11 Applicable Standards for Masonry
The applicable standards for Masonry are listed below:
BDS EN 197-1: 2003 Cement Part-1 Composition, Specifications and Conformity Criteria for Common
(Reaffirmed 2010) Cements.
BDS 208 : 2009
BDS 238 Specification for Common Building Clay Bricks .:Specifies the dimensions, quality and
strength of common burnt clay bricks, methods of sampling, testing etc.
BDS 1249 : 1989
BDS 1250 : 1990 Fire Clay Refractory Bricks and Shapes for General Purposes: This Standard specifies
BDS 1263 : 1990 the requirements for fireclay refractory bricks and shapes meant for general purpose;
the products are classified in four grades according to the duty for which they are
BDS 1264 : 1990 suitable.
BDS 1432 : 1993 Acid Resistant Bricks: It specifies the requirements for acid-resistant bricks,
dimensions, tolerances, test etc.
Burnt Clay Facing Bricks: It specifies the dimensions, quality and strength of burnt clay
facing bricks used in building and other structure, physical requirements etc.
Burnt Clay Hollow Bricks for Walls and Partitions: It covers the dimensions, quality
and strength for hollow bricks made from burnt clay and having perforations through
and at right angle to the bearing surface tests.
Glossary of Terms Relating to Structural Clay Products: It covers the definition of
common terms applicable to structural clay products, used in building and civil
engineering works.
Burnt Clay Perforated Building Bricks: Specifies the requirements in regard to
dimensions, perforations, quality, strength and also for quality of surface in case of
special grade for facing bricks of perforated burnt clay building bricks for use in walls
and partitions.
Bangladesh National Building Code 2015 5-7
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BDS 1433 : 1993 BNBC 2015 FINAL DRAFTDimensions quantities in general construction work: Specifies the various dimensional
values in SI units used in general construction work.
BDS 1803 : 2008
BDS EN 1338: 2009 Specification for hollow clay bricks and blocks.
BDS EN 1339:2009
BDS EN 1340:2009 Concrete paving blocks - Requirements and test methods.
BDS EN 13369: 2009
BDS EN 771-3: 2009 Concrete paving flags - Requirements and test methods.
BDS EN 772-1: 2009 Concrete kerb units - Requirements and test methods.
BDS EN 772-2: 2009
Common rules for precast concrete products.
BDS EN 772-6: 2009
Specification for masonry units Part 3: Aggregate concrete masonry units (dense and
BDS EN 772-11: 2009 lightweight aggregates).
BDS EN 772-13: 2009 Methods of test for masonry units Part 1: Determination of compressive strength.
BDS EN 772-14: 2009 Methods of test for masonry units Part 2: Determination of percentage area of voids
in masonry units (by paper indentation).
BDS EN 772-16: 2009
BDS EN 772-20: 2009 Methods of test for masonry units Part 6: Determination of bending tensile strength
of aggregate concrete masonry units.
BDS EN 1052-3: 2009
BDS EN 1745: 2009 Methods of test for masonry units Part 11: Determination of water absorption of
ANSI A108.1A aggregate concrete, autoclaved aerated concrete, manufactured stone and natural
ANSI A108.1B stone masonry units due to capillary action and the initial rate of water absorption of
clay masonry units.
ANSI A108.1
ASTM A82/A82M Methods of test for masonry units Part 13: Determination of net and gross dry
ASTM A1008/A1008M density of masonry units (except for natural stone).
ASTM A615/A615M Methods of test for masonry units Part 14: Determination of moisture movement of
aggregate concrete and manufactured stone masonry units.
ASTM A996/A996M
Methods of test for masonry units Part 16: Determination of dimensions.
ASTM A706/A706M
Methods of test for masonry units Part 20: Determination of flatness of faces of
ASTM A183 masonry units.
ASTM A775/A775M
Methods of test for masonry Part 3: Determination of initial shear strength.
Masonry and masonry products: Methods for determining design thermal values.
Installation of Ceramic Tile in the Wet-Set Method, with Portland Cement Mortar.
Installation of Ceramic Tile, Quarry Tile on a Cured Portland Cement Mortar Setting
Bed with Dry-set or Latex-Portland Mortar.
Specifications for the Installation of Ceramic Tile with Portland Cement Mortar.
Specification for Steel Wire, Plain, for Concrete Reinforcement.
Standard Specification for Steel, Sheet, Cold-Rolled, Carbon, Structural, High-Strength
Low-Alloy, High-Strength Low-Alloy with Improved Formability, Solution Hardened,
and Bake Hardenable.
Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete
Reinforcement.
Standard Specification for Rail-Steel and Axle-Steel Deformed Bars for Concrete
Reinforcement.
Standard Specification for Low-Alloy Steel Deformed and Plain Bars for Concrete
Reinforcement.
Standard Specification for Carbon Steel Track Bolts and Nuts.
Standard Specification for Epoxy-Coated Steel Reinforcing Bars.
5-8 Vol. 1
Building Materials Chapter 2
ASTM C5 Standard Specification for Quicklime for Structural Purposes.
ASTM C34 Standard Specification for Structural Clay Load-Bearing Wall Tile.
ASTM C55 Standard Specification for Concrete Building Brick.
ASTM C56 Standard Specification for Structural Clay Non load bearing Tile.
ASTM C73 Standard Specification for Calcium Silicate Brick (Sand-Lime Brick).
ASTM C90 Standard Specification for Load bearing Concrete Masonry Units.
ASTM C91 Standard Specification for Masonry Cement.
ASTM C126 Standard Specification for Ceramic Glazed Structural Clay Facing Tile, Facing Brick,
and Solid Masonry Units.
ASTM C129 Standard Specification for Non-load bearing Concrete Masonry Units.
ASTM C144 Standard Specification for Aggregate for Masonry Mortar.
ASTM C90 Standard Specification for Load bearing Concrete Masonry Units.
ASTM C150/C150M Standard Specification for Portland Cement.
ASTM C207 Standard Specification for Hydrated Lime for Masonry Purposes.
ASTM C212 Standard Specification for Structural Clay Facing Tile.
ASTM C270 Standard Specification for Mortar for Unit Masonry.
ASTM C331 Standard Specification for Lightweight Aggregates for Concrete Masonry Units.
ASTM C404 Standard Specification for Aggregates for Masonry Grout.
ASTM C476 Standard Specification for Grout for Masonry.
ASTM C595/C595M Standard Specification for Blended Hydraulic Cements.
ASTM C744 Standard Specification for Prefaced Concrete and Calcium Silicate Masonry Units.
BNBC 2015 FINAL DRAFT
2.3 CEMENT AND CONCRETE
2.3.1 General
Materials used to produce concrete, and admixtures used for concrete shall comply with the requirements of
this Section and those of Chapter 5 Part 6 of this Code.
2.3.2 Aggregates
Concrete aggregates shall conform to the following standards:
BDS 243: 1963, Coarse and Fine Aggregates from Natural Sources for Concrete; ASTM C33/C33M Concrete
Aggregates; ASTM C330/C330M Lightweight Aggregates for Structural Concrete; ASTM C637 Aggregates for
Radiation-Shielding Concrete; ASTM C332 Lightweight Aggregate for Insulating Concrete; IS: 9142 Artificial
lightweight aggregates for concrete masonry units.
2.3.2.1 Special tests
Aggregates failing to meet the specifications listed in Sec 2.4.2 shall not be used unless it is shown by special test
or actual service experience to produce concrete of adequate strength and durability and approved by the
Building Official.
2.3.2.2 Nominal size
Nominal maximum size of coarse aggregate shall not be larger than:
(a) One-fifth of the narrowest dimension between sides of forms; or
Bangladesh National Building Code 2015 5-9
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Building Materials
(b) One-third the depth of slabs; or
(c) Three fourths the minimum clear spacing between individual reinforcing bars or wires, bundles of bars,
or pre-stressing tendons or ducts.
Exception:
The above limitations regarding size of coarse aggregate may be waived if, in the judgment of the Engineer,
workability and methods of consolidation are such that concrete can be placed without honeycomb or voids.
2.3.3 Cement
Cement shall conform to the following standards: BDS EN 197-1:2003 Cement Part-1 Composition, specifications
and conformity criteria for common cements; BDS 612 Sulphate resisting Portland cement-type A; ASTM
C150/C150M, BDS 232 Portland cement; ASTM C595/C595M Blended Hydraulic Cements; and to other such
cements listed in ACI 318.
2.3.4 Water
Water used in mixing concrete shall be clean and free from injurious amounts of oils, alkalies salts, organic
materials or other substances that may be deleterious to concrete or reinforcement. Water shall conform to the
following standards: BDS ISO 12439:2011 Mixing water for concrete.
BNBC 2015 FINAL DRAFT
2.3.4.1 Chloride ions
Mixing water for pre-stressed concrete or for concrete that will contain aluminium embedment, including the
portion of mixing water contributed in the form of free moisture on aggregates shall not contain deleterious
amounts of chloride ion. The maximum water-soluble chloride ion concentration in concrete shall not exceed
the limitations specified in Sec 5.5.3 Part 6.
2.3.4.2 Potability
Nonpotable water shall not be used in concrete unless the following are satisfied:
(a) Selection of concrete proportions shall be based on concrete mixes using water from such source.
(b) Mortar test cubes made with nonpotable mixing water shall have 7 days and 28 days strengths equal to
at least 90 percent of strengths of similar specimens made with potable water.
2.3.5 Admixtures
Admixtures to be used in concrete shall be subject to prior approval by the Building Official and shall comply
with Sections 2.4.5.1 to 2.4.5.5.Admixtures shall conform following standards:
BDS EN 934-1:2008 Admixtures for Concrete, Mortar and Grout - Part 1: Common Requirements
BDS EN 934-2:2008
Admixtures for Concrete, Mortar and Grout - Part 2: Concrete Admixtures
Definitions, Requirements, Conformity, Marking and Labelling
2.3.5.1 Chloride
Calcium chloride or admixtures containing chloride from admixture ingredients shall not be used inprestressed
concrete, concrete containing embedded aluminium in concrete cast against permanent galvanized metal
forms, or in concrete exposed to severe or very severe sulphate-containing solutions (Sec 5.5.2.1 Part 6).
2.3.5.2 Standards
Air-entraining admixtures shall conform to ASTM C260 Standard Specification for Air-entraining Admixtures for
Concrete. Water-reducing admixtures, retarding admixtures, accelerating admixtures, water-reducing and
retarding admixtures, and water-reducing and accelerating admixtures shall conform to ASTM C494/C494M
Chemical Admixtures for Concrete, or ASTM C1017/C1017M Chemical Admixtures for Use in Producing Flowing
Concrete.
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2.3.5.3 Pozzolanas BNBC 2015 FINAL DRAFT
Fly ash (Pulverized Fuel Ash) or other Pozzolanas used as admixtures shall conform to ASTM C618.
2.3.5.4 Blast furnace slag
Ground granulated blast-furnace slag used as an admixture shall conform to ASTM C989.
2.3.5.5 Pigment for coloured concrete
Pigment for integrally coloured concrete shall conform to ASTM C979.
2.3.6 Metal Reinforcement
Reinforcement and welding of reinforcement to be placed in concrete shall conform to the requirements of this
Section.
(a) Deformed Reinforcement: Deformed reinforcing bars shall conform to the following Standards; BDS ISO
6935-2:2010, Steel for the reinforcement of concrete - Part-2: Ribbed bars; Reinforcement conforming to
the ASTM, Standards: A615/A615M Deformed and Plain Billet-Steel Bars; A616M, Rail-Steel Deformed and
Plain Bars; A617M Axle-Steel Deformed and Plain Bars; A706M Low-Alloy Steel Deformed Bars; A767M Zinc
Coated (Galvanized) Steel Bars; and A775M Epoxy-Coated Reinforcing Steel.
Deformed reinforcing bars with a specified yield strength exceeding 410 MPa may be used, provided
shall be the stress corresponding to a strain of 0.35 percent and the bars otherwise conform to ASTM
standards noted above. Fabricated deformed steel bar mats conforming to ASTM A184/A184M and
deformed steel wire complying with ASTM A496/A496M may be used. Deformed wire for concrete
reinforcement shall not be smaller than size D4 (nominal diameter: 5.72 mm), and for wire with a specified
yield strength, exceeding 410 MPa, shall be the stress corresponding to a strain of 0.35 percent.
Welded deformed steel wire fabric conforming to ASTM A497/A497M may be used; for a wire with
specified yield strength exceeding 410 MPa, shall be the stress corresponding to a strain of 0.35
percent. Welded intersections shall not be spaced farther apart than 400 mm in direction of calculated
stress, except for wire fabric used as stirrups.
(b) Plain Reinforcement: Plain reinforcement shall conform to the following BDS and ASTM Standards. BDS ISO
6935-1:2010; ASTM A615/A615M; ASTM A996/A996M and ASTM A996/A996M. Steel welded wire, fabric
plain reinforcement conforming to ASTM A185/A185M may be used, except that for wire with specified
yield strength exceeding 410 MPa, shall be the stress corresponding to a strain of 0.35 percent.
Welded intersections shall not be spaced farther apart than 300 mm in direction of calculated stress, except
for wire fabric used as stirrups.
Smooth steel wire conforming to ASTM A182/A182M may be used in concrete; except that for a wire with
specified yield strength exceeding 410 MPa, shall be the stress corresponding to a strain of 0.35
percent.
(c) Cold-worked Steel Reinforcement: Cold-worked steel high strength bars shall conform to IS 1786 or BS
4461: 1978.
(d) Pre-stressing Tendons: Wire, strands and bars for tendons in pre-stressed concrete shall conform to BDS:
240 Plain cold drawn steel wire; ASTM A416/A416M Steel Strand Uncoated Seven-Wire Stress Relieved;
ASTM A421/A421M: Uncoated Stress Relieved Steel Wire; and ASTM A722/A722M: Uncoated High-Strength
Steel Bar.
Wires, strands and bars not specifically listed in the above standards may be used, provided they conform
to minimum requirements of these specifications and do not have properties that make them less
satisfactory than those listed.
Bangladesh National Building Code 2015 5-11
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Building Materials
(e) Structural Steel, Steel Pipe or Tubing: Structural steel used with reinforcing bars in composite compression
members meeting the requirements of the Code shall conform to ASTM A36/A36M Structural Steel; ASTM
A242/A242M High Strength Low-Alloy Structural Steel; ASTM A572/A572M High-Strength Low-Alloy
Columbium-Vanadium Steel; and ASTM A588/A588M High-Strength Low-Alloy Structural Steel.
Steel pipe or tubing for composite compression members composed of a steel-encased concrete core
meeting the requirements of this Code shall conform to ASTM A53/A53M Pipe, Steel, Black and Hot Dipped
Zinc Coated Welded and Seamless; ASTM A500/A500M Cold-Formed Welded and Seamless Carbon Steel
Structural Tubing in Rounds and Shapes; and ASTM A501 Hot-Formed Welded and Seamless Carbon Steel
Structural Tubing.
2.3.7 Applicable Standards
Materials used in concrete shall comply with the applicable standards listed below.
BDS 279:1963 BNBC 2015 FINAL DRAFTSpecification for Abrasion of Coarse Aggregates by Use of Los Angeles Machine
(under revision).
BDS 281:1963
BDS 921:1980 Specification for Organic Impurities in Sands for Concrete (under revision).
BDS 240:1963
BDS 243:1963 Specification for Standard Sand for Testing of Cement.
BDS ISO 1920-8: 2010
Specification for Plain Cold Drawn Steel Wire for Pre-stressed Concrete.
BDS ISO 1920-9: 2010
Specification for Coarse and Fine Aggregates from Natural Sources for Concrete.
BDS ISO 1920-10: 2011
Testing of Concrete - Part 8: Determination of Drying Shrinkage of Concrete
BDS ISO 22965-1: 2008 for Samples Prepared in the Field or in the Laboratory.
BDS ISO 22965-2: 2008
Testing of Concrete - Part 9: Determination of Creep of Concrete Cylinders in
ASTM C31/C31M Compression.
ASTM C39/C39M
Testing of Concrete - Part 10: Determination of Static Modulus of Elasticity in
ASTM C42/C42M Compression.
ASTM C78 Concrete - Part 1: Methods of Specifying and Guidance for the Specifier.
ASTM C94/C94M Concrete - Part 2: Specification of Constituent Materials, Production of
ASTM C172 Concrete and Compliance of Concrete.
ASTM C192/C192M
Standard Practice for Making and Curing Concrete Test Specimens in the Field.
ASTM C317/C317M
ASTM C496/C496M Standard Test Method for Compressive Strength of Cylindrical Concrete
Specimens.
ASTM C617
ASTM C685/C685M Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams
of Concrete.
ASTM C989
Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with
Third-Point Loading)
Standard Specification for Ready-Mixed Concrete.
Standard Practice for Sampling Freshly Mixed Concrete.
Standard Practice for Making and Curing Concrete Test Specimens in the
Laboratory.
Standard Specification for Gypsum Concrete.
Standard Test Method for Splitting Tensile Strength of Cylindrical Concrete
Specimens.
Standard Practice for Capping Cylindrical Concrete Specimens.
Standard Specification for Concrete Made by Volumetric Batching and Continuous
Mixing.
Standard Specification for Slag Cement for Use in Concrete and Mortars.
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2.3.8 Concrete Pipe and Precast Sections
Concrete pipes and precast sections shall conform to the Standards listed below:
BDS 1626:1999 BNBC 2015 FINAL DRAFTConcrete pipes (with and without) reinforcement.
ASTM C14M
Standard Specification for Non-reinforced Concrete Sewer, Storm Drain, and
ASTM C76M Culvert Pipe (Metric).
ASTM C361M Standard Specification for Reinforced Concrete Culvert, Storm Drain, and Sewer
ASTM C444M Pipe (Metric).
ASTM C478M
ASTM C507M Standard Specification for Reinforced Concrete Low-Head Pressure Pipe (Metric).
ASTM C654M Standard Specification for Perforated Concrete Pipe (Metric).
ASTM C655M
Standard Specification for Precast Reinforced Concrete Manhole Sections (Metric).
ASTM C1433M
Standard Specification for Reinforced Concrete Elliptical Culvert, Storm Drain, and
ASTM C858 Sewer Pipe (Metric).
ASTM C891
Standard Specification for Porous Concrete Pipe (Metric).
ASTM C913
ASTM C924M Standard Specification for Reinforced Concrete D-Load Culvert, Storm Drain, and
Sewer Pipe (Metric).
IS 458
IS 784 Standard Specification for Precast Reinforced Concrete Monolithic Box Sections
IS 1916 for Culverts, Storm Drains, and Sewers (Metric).
IS 3597
IS 4350 Standard Specification for Underground Precast Concrete Utility Structures.
IS 7319
IS 7322 Standard Practice for Installation of Underground Precast Concrete Utility
Structures.
Standard Specification for Precast Concrete Water and Wastewater Structures.
Standard Practice for Testing Concrete Pipe Sewer Lines by Low-Pressure Air Test
Method (Metric).
Specification for precast concrete pipes with and without reinforcement.
Specification for pre-stressed concrete pipes.
Specification for steel cylinder pipe with concrete lining and coating.
Methods of test for concrete pipes.
Specification for concrete porous pipes for under drainage.
Specification for perforated concrete pipes.
Specification for specials for steel cylinder reinforced concrete pipes.
2.4 PRE-STRESSED CONCRETE
2.4.1 Concrete for Pre-stressed Concrete
Cement and concrete required for pre-stressed concrete are elaborately described in Sec 2.3 of this Part. BDS
and other standards for concrete as a material are also contained in the same section.
2.4.2 Steel for Pre-stressed Concrete
Steel and tendons for pre-stressed concrete along with the BDS and other standard requirements are included
in Sec 2.8 of this Part.
Steel material for pre-stressed concrete shall also conform following Standards.
Bangladesh National Building Code 2015 5-13
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Building Materials
BDS ISO 6934 - 1 : 2008 Steel for the prestressing of concrete - Part 1: General requirements.
BDS ISO 6934 - 2 : 2008
BDS ISO 6934 - 3 : 2008 Steel for the prestressing of concrete - Part 2: Cold-drawn wire.
BDS ISO 6934 - 4 : 2008
BDS ISO 6934- 5: 2008 Steel for the prestressing of concrete - Part 3: Quenched and tempered wire.
BDS ISO 6935 (Part-1): 2010
BDS ISO 6935 (Part-2): 2010 Steel for the prestressing of concrete - Part 4: Strand.
BDS ISO 6935 (Part-3): 2006
Steel for the Prestressing of concrete - Part 5: Hot-rolled steel bars with or
BDS ISO 10065: 2006 without subsequent processing.
BDS ISO 15835-1:2010
BDS ISO 15835-2:2010 Steel for the reinforcement of concrete - Part-1: Plain bars.
BDS ISO 10144:2006
BDS ISO 15630-1: 2008 Steel for the reinforcement of concrete - Part-2: Ribbed bars.
BDS ISO 15630-2: 2008
BDS ISO 15630-3: 2008 Steel for the reinforcement of concrete - Part-3: Welded fabric. Specifies
BDS ISO 16020: 2008 technical requirements for factory made sheets or rolls welded fabric
manufacture from steel wires or bars with diameters from 4 mm to 16 mm
and designed for reinforcement in ordinary concrete structured and for non-
prestressed reinforcement in prestressed concrete structures.
Steel bars reinforcement of concrete bend and re-bend tests.
Steel for the reinforcement of concrete - Reinforcement couplers for
mechanical splices of bars - Part 1: Requirements.
Steel for the reinforcement of concrete - Reinforcement couplers for
mechanical splices of bars - Part 2: Test methods.
Certification scheme for steel bars and wires for the reinforcement of
concrete structures.
Steel for the reinforcement and Prestressing of concrete - Test methods - Part
1: Reinforcing bars, wire rod and wire.
Steel for the reinforcement and prestressing of concrete - Test methods - Part
2: Welded fabric.
Steel for the Reinforcement and prestressing of concrete - Test methods - Part
3: Prestressing steel.
Steel for the reinforcement and prestressing of concrete - Vocabulary.
BNBC 2015 FINAL DRAFT
2.5 BUILDING LIMES
2.5.1 Types of Lime
According to the degree of calcinations, slaking and setting actions and depending upon the nature and amount
of foreign matters associated with, the limes are classified as: (i) High calcium, fat, rich, common or pure lime;
(ii) Lean, meager or poor lime; and (iii) Hydraulic or water lime
2.5.2 Properties of Lime
A good lime should slake readily in water, dissolve in soft water, free from fuel ashes and unburnt particles and
have good setting power under water.
Building limes shall comply with the following ASTM standard specifications: ASTM C206 Finishing Hydrated
Lime; ASTM C207 Hydrated Lime for Masonry Purposes; ASTM C141/C141M Hydraulic Hydrated Lime for
Structural Purposes; ASTM C977 Quicklime and Hydrated Lime for Soil Stabilization; and ASTM C5 Quicklime for
Structural Purposes.
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The following Indian Standards may also be accepted for lime concrete and testing of building limes:
IS712 Specification for building limes.
IS1624 Method of field testing of building lime.
IS 2686 Specification for cinder aggregates for use in lime concrete.
IS 3068 Specification for broken brick (burnt clay) coarse aggregates for use in lime concrete.
IS 3115 Specification for lime-based blocks.
IS 3182 Specification for broken brick (burnt clay) fine aggregates for use in lime mortar.
IS 4098 Specification for lime-pozzolana mixture.
IS 4139 Specification for sand-lime bricks.
IS 6932(Parts I to XI) Method of tests for building limes.
IS 10360 Specification for lime-pozzolana concrete blocks for paving.
IS 10772 Specification for quick setting lime pozzolana mixture.
IS12894 Specification for pulverized fuel ash lime bricks.
BNBC 2015 FINAL DRAFT
2.6 GYPSUM BASED MATERIALS AND PLASTER
2.6.1 Gypsum Board
Gypsum wallboard, gypsum sheathing, gypsum base for gypsum veneer plaster, exterior gypsum soffit board,
pre-decorated gypsum board or water resistant gypsum backing board complying with the standards listed
below.
2.6.2 Gypsum Plaster
A mixture of calcined gypsum or calcined gypsum and lime and aggregate and other approved materials as
specified in this Code.
2.6.3 Gypsum Veneer Plaster
Gypsum plaster applied to an approved base in one or more coats normally not exceeding 1/4 inch (6.4 mm) in
total thickness.
2.6.4 Cement Plaster
A mixture of Portland or blended cement, Portland cement or blended cement and hydrated lime, masonry
cement or plastic cement and aggregate and other approved materials as specified in this Code.
Gypsum building materials shall conform to the Standards listed below.
ASTM C22/C22M Standard Specification for Gypsum.
ASTM C28/C28M Standard Specification for Gypsum Plasters.
ASTM C35 Standard Specification for Inorganic Aggregates for Use in Gypsum Plaster.
ASTM C59/C59M Standard Specification for Gypsum Casting Plaster and Gypsum Molding Plaster.
ASTM C317/C317M Standard Specification for Gypsum Concrete.
ASTM C471M Standard Test Methods for Chemical Analysis of Gypsum and Gypsum Products.
ASTM C472 Standard Test Methods for Physical Testing of Gypsum, Gypsum Plasters and Gypsum
Concrete.
ASTM C473 Standard Test Methods for Physical Testing of Gypsum Panel Products.
Bangladesh National Building Code 2015 5-15
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Building Materials
ASTM C474 Standard Test Methods for Joint Treatment Materials for Gypsum Board
Construction.
ASTM C587
ASTM C1396/C1396M Standard Specification for Gypsum Veneer Plaster.
IS 2849-1983
Standard Specification for Gypsum Board.
Specification for non-load bearing gypsum partition blocks (solid and hollow types).
2.7 FLOORING MATERIALSBNBC 2015 FINAL DRAFT
2.7.1 General
Flooring materials are generally of two types; precast systems like tiles, bricks and cast in-situ.
2.7.2 Concrete/Terrazzo Tiles
Concrete/Terrazzo tiles shall have good abrasion and impact resistance properties. Factors such as the type of
cement and the type and grading of aggregate used, influence the resistance of such tiles to chemicals including
cleaning agents. Terrazzo tiles shall have a wear layer after grinding at least 6 mm composed of graded marble
chipping in white, tinted or grey Portland cement on a layer of fine concrete. They may be ground after
manufacture to expose the marble aggregate and subsequently grouted. Slip resisting grits may be
incorporated. These tiles shall conform to BDS EN 13748-1:2008 Terrazzo tiles - Part 1: Terrazzo tiles for internal
use; BDS EN 13748-2:2008 Terrazzo tiles - Part 2: Terrazzo tiles for external use; BDS 1262: 1990 Clay flooring
tiles; BDS 1248: 1989 Ceramic unglazed vitreous acid resistant tiles or IS: 1237, Specification for cement
concrete flooring tile.
2.7.3 Asphalt Tiles/Flooring
Asphalt tiles/floorings are suitable for industrial flooring in areas where they will not be exposed to solvents,
grease, oil, corrosive chemicals and excessive heat. Bitumen mastic for flooring shall conform to IS: 1195; IS:
8374 Bitumen Mastic, Anti-static and Electrically Conducting Grade and IS: 9510 Bitumen Mastic Acid Resisting
Grade.
2.7.4 Mosaic Tiles
Mosaic tiles of a variety of shapes and sizes may be used. Thickness of the wear layer is dependent on the sizes
of marble chips but shall not be less than 6 mm thick. The tiles shall be wet cured for sufficient time before
laying so that their surfaces are not damaged during grinding and polishing.
2.7.5 Clay Tile
Clay floor tiles shall have sufficient strength and abrasion resistant characteristics to withstand the impact and
abrasion they are likely to be subject to. When glazed earthenware tiles are used in flooring they shall conform
to IS: 777 Glazed Earthenware Tiles.
2.7.6 Vinyl Tiles
The vinyl tiles shall consist of a thoroughly blended composition of thermoplastic binder, asbestos fibre, fillers
and pigments. The thermoplastic binder shall consist substantially of either or both of the following:
(a) Vinyl chloride polymer
(b) Vinyl chloride copolymers.
The polymeric material shall be compounded with suitable plasticizers and stabilizers. The tiles may be plain,
patterned or mottled. The thickness shall not be less than 1.5 mm.
5-16 Vol. 1
Building Materials Chapter 2
2.7.7 Rubber Tiles
These tiles are composed of natural, synthetic or reclaimed rubber, or a combination of these, with reinforcing
fibres, pigments, and fillers, vulcanized and molded under pressure. The tiles shall have excellent resilience and
resistance to indentation, and good resistance to grease, alkali and abrasion. The thickness shall not be less than
2 mm.
2.7.8 Cast In-situ Floor Coverings
(a) Terrazzo: Terrazzo is a marble mosaic with Portland cement matrix and is generally composed of two parts
marble chips to one part Portland cement. Color pigments may be added. The thickness of terrazzo topping
may vary from 13 mm to 19 mm and may be applied to green concrete of the floor or bonded with neat
Portland cement, or over a sand cushion placed on the concrete floor.
(b) Concrete: A concrete topping may be applied to a concrete structural slab before or after the base slab has
hardened. Integral toppings may generally be 25 mm to 40 mm thick; independent toppings about 25 mm
to 50 mm thick. Aggregate sizes shall not exceed 6 mm.
2.7.9 Other Flooring Materials
BNBC 2015 FINAL DRAFT
Other flooring materials i.e. bricks, natural stone, etc. showing satisfactory performance in similar situations
may be allowed. Plastic flooring tile and ceramic unglazed vitreous acid resistant tiles, if used, shall conform to
IS: 3464 and IS: 4357 respectively.
Flooring compositions complying with IS: 657, Materials for use in the manufacture of magnesium oxychloride
flooring composition; and IS: 9197, Epoxy resin composition for floor topping may be allowed. Linoleum sheets
and tiles shall conform to IS: 653.
Flooring materials shall also conform to the standards listed below.
BDS 1248: 1989 Ceramic unglazed vitreous acid resistant tiles seat covers the requirements for
BDS 1262: 1990 ceramic unglazed vitreous acid resistant tiles used in lying of floors & lining of
BDS ISO 10545 ‐ 1: 2006 tanks subjected to corrosive conditions. Manufacture, Finish, Tests etc.
BDS ISO 10545 ‐ 2: 2006
Clay flooring tiles.
BDS ISO 10545 ‐ 3: 2006 Specifies the requirements for dimensions, quality & strength for clay flooring
tiles & different types of tests.
Ceramic tiles, Sampling and basis for acceptance.
Specifies rules for batching, sampling, inspection and acceptance/rejection of
ceramic tiles.
Ceramic tiles, Determination of dimensions and surface quality.
Specifies methods for determining the dimensional characteristics (length,
width, thickness, straightness of sides, rectangularity, and surface flatness) and
the surface of ceramic tiles.
Ceramic tiles, Determination of water absorption, apparent porosity, apparent
relative density and bulk density.
BDS ISO 10545 ‐ 4: 2006 Specifies methods for determining water absorption, apparent porosity,
BDS ISO 10545 ‐ 5: 2005 apparent relative density and bulk density of ceramic tiles.
Ceramic tiles, Determination of modulus of rupture and breaking strength
Defines a test method for determining the modulus of rupture and breaking
strength of all ceramic tiles.
Ceramic tiles, Determination of impact resistance by measurement of coefficient
of restitution
Bangladesh National Building Code 2015 5-17
Part 5
Building Materials
BDS ISO 10545 ‐ 6: 2006 BNBC 2015 FINAL DRAFTSpecifies methods for determining the impact resistance of ceramic tiles by
BDS ISO 10545 ‐ 7: 2006 measuring the coefficient of restitution.
BDS ISO 10545 ‐ 8: 2006
BDS ISO 10545 ‐ 9: 2006 Ceramic tiles, Determination of resistance to deep abrasion for unglazed tiles.
BDS ISO 10545 ‐ 10: 2006
BDS ISO 10545 ‐ 11: 2006 Ceramic tiles, Determination of resistance to surface abrasion for glazed tiles.
BDS ISO 10545 ‐ 12: 2006 Specifies a method for determining the resistance to surface abrasion of all
BDS ISO 10545 ‐ 13: 2006 glazed ceramic tiles used for floor covering.
BDS ISO 10545 ‐ 14: 2006
BDS ISO 10545 ‐ 15: 2006 Ceramic tiles, Determination of linear thermal expansion
BDS ISO 10545 ‐ 16: 2006
Defines a test method for determining the coefficient of linear thermal
BDS EN 490: 2008 expansion of ceramic tiles.
BDS ISO 13006: 2006
Ceramic tiles, Determination of resistance to thermal shock.
BDS EN 491: 2008
Defines a test method for determining the resistance to thermal shock of all
ceramic tiles under normal conditions of use.
Ceramic tiles, Determination of moisture expansion.
Specifies a method for determining the moisture expansion of all ceramic tiles.
Ceramic tiles, Determination of crazing resistance for glazed tiles.
Defines a test method for determining the crazing resistance of all glazed
ceramic tiles except when the crazing is an inherent decorative feature of the
product.
Ceramic tiles, Determination of frost resistance.
Specifies a method for determining the frost resistance of all ceramic tiles
intended for use in freezing conditions in the presence of water.
Ceramic tiles, Determination of chemical resistance.
Specifies a test method for determining the chemical resistance of all ceramic
tiles at room temperature. The method is applicable to all types of ceramic tiles.
Ceramic tiles, Determination of resistance to stains.
Specifies a method for determining the resistance to stains of the proper surface
of ceramic tiles.
Ceramic tiles, Determination of lead and cadmium given off by glazed tiles.
Specifies a method for the determination of lead and cadmium given off by the
glaze of ceramic tiles.
Ceramic tiles, Determination of small color differences.
Describes a method for utilizing color measuring instruments for quantifying the
small color differences between plain colored glazed ceramic tiles, which are
designed to be uniform and consistent color It permits the specification of a
maximum acceptable value which depends only on the closeness of match and
not on the nature of the color difference.
Concrete roofing tiles and fittings for roof covering and all cladding - Product
specifications.
Ceramic tiles ‐ Definitions, classification, characteristics and marking.
This Standard defines terms and establishes classifications characteristics and
marking requirements for ceramic tiles of the best commercial quality (first
quality).
Concrete roofing tiles and fittings for roof covering and wall cladding - Test
methods.
5-18 Vol. 1
Building Materials Chapter 2
BDS EN 538: 2008 Clay roofing tiles for discontinuous laying - Flexural strength test.
BDS EN 539 ‐ 1: 2008
Clay roofing tiles for discontinuous laying. Determination of physical
BDS EN 1024: 2008 characteristics - Part 1: Impermeability test.
BDS EN 1304: 2008 Clay roofing tiles for discontinuous laying - Determination of geometric
BDS EN 13748 ‐ 1: 2008 characteristics.
BDS EN 13748 ‐ 2: 2008
Clay roofing tiles and fittings - Product definitions and specifications.
Terrazzo tiles - Part 1: Terrazzo tiles for internal use.
Terrazzo tiles - Part 2: Terrazzo tiles for external use.
2.8 STEEL
2.8.1 Reinforcing Steel
Reinforcing steel shall comply with the requirements specified in Sec 2.3.6 in this Part.
2.8.2 Structural Steel
BNBC 2015 FINAL DRAFT
Structural steel shall conform to Bangladesh Standards BDS 878: 1978, Specification for weld able structural
steels; BDS 1355: 1992, Dimensions and properties of hot rolled steel beam, column, channel and angle
sections. Where Bangladesh standards are not available, the relevant standards listed below shall be applicable.
BDS 1429:1993 Light gauge steel sections.
BDS ISO 2566 - 1
BDS ISO 2566 - 2 Steel - Conversion of elongation values - Part 1: Carbon and low alloy steels.
BDS ISO 657 - 1
BDS ISO 657 - 2 Steel - Conversion of elongation values - Part 2: Austenitic steels.
BDS ISO 657 - 5
Hot-rolled steel sections - Part 1: Equal-leg angles - Dimensions.
BDS ISO 657 - 11
Hot-rolled steel sections - Part 2: Unequal-leg angles - Dimensions.
BDS ISO 657 - 15
Hot-rolled steel sections - Part V Equal-leg angles and unequal leg angles -
BDS ISO 657 - 16 Tolerances for metric and inch series.
BDS ISO 657 - 18 Hot-rolled steel sections - Part 11: Sloping flange channel sections (Metric series) -
Dimensions and sectional properties.
BDS ISO 657 - 19
Hot-rolled steel sections - Part 15 Sloping flange beam sections (Metric series) -
BDS ISO 657 - 21 Dimensions and sectional properties.
BDS ISO 10474 Hot-rolled steel sections - Part 16: Sloping flange column sections (metric series) -
BDS ISO 14284 Dimensions and sectional properties.
BDS ISO 9769 Hot-rolled steel sections - Part 18: L sections for shipbuilding (metric series) 104 -
BDS ISO 6929 Dimensions, sectional properties and tolerances.
BDS ISO 20723
Hot-rolled steel sections - Part 19: Bulb flats (metric series) - Dimensions, sectional
properties and tolerances.
Hot-rolled steel sections - Part 21 T-sections with equal depth and flange width -
Dimensions.
Steel and steel products - Inspection documents.
Steel and iron - Sampling and preparation of samples for the determination of
chemical composition.
Steel and iron - Review of available methods of analysis.
Steel products - Definition and classification.
Structural steels - Surface condition of hot-rolled sections - Delivery requirements.
Bangladesh National Building Code 2015 5-19
Part 5
Building Materials
BDS ISO 24314 BNBC 2015 FINAL DRAFTStructural steels - Structural steels for building with improved seismic resistance -
Technical delivery conditions.
BDS ISO 404
BDS ISO 1127 Steel and steel products - General technical delivery requirements.
BDS ISO 4200 Stainless steel tubes - Dimensions, tolerances and conventional masses per unit
length.
BDS ISO 6761
ASTM A27/A27M Plain end steel tubes, welded and seamless - General tables of dimensions and
ASTM A36/A36M masses per unit length.
ASTM A48/A48M
ASTM A53/A53M Steel tubes - Preparation of ends of tubes and fittings for welding.
ASTM A148/A148M Standard Specification for Steel Castings, Carbon, for General Application.
ASTM A242/A242M
ASTM A252 Standard Specification for Carbon Structural Steel.
ASTM A283/A283M
Standard Specification for Gray Iron Castings.
ASTM A307
ASTM A325 Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded
and Seamless.
ASTM A325M
Standard Specification for Steel Castings, High Strength, for Structural Purposes.
ASTM A336/A336M
Standard Specification for High-Strength Low-Alloy Structural Steel.
ASTM A653/A653M
Standard Specification for Welded and Seamless Steel Pipe Piles.
ASTM A449
Standard Specification for Low and Intermediate Tensile Strength Carbon Steel
ASTM A490 Plates.
ASTM A500/A500M Standard Specification for Carbon Steel Bolts and Studs, 60 000 PSI Tensile Strength.
ASTM A501 Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi
Minimum Tensile Strength.
ASTM A514/A514M
Standard Specification for Structural Bolts, Steel, Heat Treated 830 MPa Minimum
ASTM A529/A529M Tensile Strength [Metric].
ASTM A563 Standard Specification for Alloy Steel Forgings for Pressure and High-Temperature
ASTM A563M Parts.
ASTM A1011/A1011M
Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-
Coated (Galvannealed) by the Hot-Dip Process.
Standard Specification for Hex Cap Screws, Bolts and Studs, Steel, Heat Treated,
120/105/90 ksi Minimum Tensile Strength, General Use.
Standard Specification for Structural Bolts, Alloy Steel, Heat Treated, 150 ksi
Minimum Tensile Strength.
Standard Specification for Cold-Formed Welded and Seamless Carbon Steel
Structural Tubing in Rounds and Shapes.
Standard Specification for Hot-Formed Welded and Seamless Carbon Steel Structural
Tubing.
Standard Specification for High-Yield-Strength, Quenched and Tempered Alloy Steel
Plate, Suitable for Welding.
Standard Specification for High-Strength Carbon-Manganese Steel of Structural
Quality.
Standard Specification for Carbons and Alloy Steel Nuts.
Standard Specification for Carbon and Alloy Steel Nuts [Metric].
Standard Specification for Steel, Sheet and Strip, Hot-Rolled, Carbon, Structural,
High-Strength Low-Alloy, High-Strength Low-Alloy with Improved Formability, and
Ultra-High Strength.
5-20 Vol. 1
Building Materials Chapter 2
ASTM A572/A572M Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural
ASTM A588/A588M Steel.
ASTM A606/A606M
ASTM A1008/A1008M Standard Specification for High-Strength Low-Alloy Structural Steel, up to 50 ksi [345
MPa] Minimum Yield Point, with Atmospheric Corrosion Resistance.
ASTM A618/A618M
ASTM A666 Standard Specification for Steel, Sheet and Strip, High-Strength, Low-Alloy, Hot-
ASTM A668/A668M Rolled and Cold-Rolled, with Improved Atmospheric Corrosion Resistance.
ASTM A690/A690M
Standard Specification for Steel, Sheet, Cold-Rolled, Carbon, Structural, High-
ASTM A852/A852M Strength Low-Alloy, High-Strength Low-Alloy with Improved Formability, Solution
Hardened, and Bake Harden able.
Standard Specification for Hot-Formed Welded and Seamless High-Strength Low-
Alloy Structural Tubing.
Standard Specification for Annealed or Cold-Worked Austenitic Stainless Steel Sheet,
Strip, Plate, and Flat Bar.
Standard Specification for Steel Forgings, Carbon and Alloy, for General Industrial
Use.
Standard Specification for High-Strength Low-Alloy Nickel, Copper, Phosphorus Steel
H-Piles and Sheet Piling with Atmospheric Corrosion Resistance for Use in Marine
Environments.
Standard Specification for Quenched and Tempered Low-Alloy Structural Steel Plate
with 70 ksi [485 MPa] Minimum Yield Strength to 4 in. [100 mm] Thick.
BNBC 2015 FINAL DRAFT
2.8.3 Steel Plate, Sheet and Strips
These shall conform to the following standards.
BDS 868 : 1978 Code of practice for galvanized corrugated sheet roof and wall coverings.
BDS 1122: 1985
BDS ISO 9328 - 1:2009 Specification for hot-dip galvanized steel sheet and coil.
BDS ISO 9328 - 2:2009 Steel flat products for pressure purposes - Technical delivery conditions - Part 1:
general requirements.
BDS ISO 9328 - 3:2009
Steel flat products for pressure purposes - Technical delivery conditions - Part 2:
BDS ISO 9328 - 4:2009 Non-alloy and alloy steels with specified elevated temperature properties.
BDS ISO 9328 - 5:2009 Steel flat products for pressure purposes - Technical delivery conditions -Part 3:
Weldable fine grain steels, normalized.
BDS ISO 9328 - 6:2009
Steel flat products for pressure purposes - Technical delivery conditions - Part 4:
BDS ISO 9328 - 7:2009 Nickel-alloy steels with specified low temperature properties.
BDS ISO 4995:2006 Steel flat products for pressure purposes - Technical delivery conditions - Part 5:
BDS ISO 7452:2008 Weldable fine grain steels, thermo mechanically rolled.
BDS ISO 7778:2008
BDS ISO 7788:2008 Steel flat products for pressure purposes - Technical delivery conditions - Part 6:
BDS ISO 9034:2008 Weldable fine grain steels, quenched and tempered.
Steel flat products for pressure purposes - Technical delivery conditions - Part 7:
Stainless steels.
Hot-rolled steel sheet of structural quality.
Hot-rolled structural steel plates - Tolerances on dimensions and shape.
Steel plate with specified through - Thickness characteristics.
Steel - Surface finish of hot-rolled plates and wide flats - Delivery requirements.
Hot-rolled structural steel wide flats - Tolerances on dimensions and shape.
Bangladesh National Building Code 2015 5-21
Part 5
Building Materials
BDS ISO 9364:2011 Continuous hot-dip aluminum/zinc coated steel sheet of commercial, drawing and
structural qualities.
BDS ISO 16160:2011
BDS ISO16162:2011 Continuously hot-rolled steel sheet products - Dimensional and shape tolerances.
BDS ISO 16163:2011
Continuously cold-rolled steel sheet products - Dimensional and shape tolerances.
IS 412
IS 1079 Continuously hot-dipped coated steel sheet products - Dimensional and shape
IS 4030 tolerances.
IS 7226
Specification for expanded metal steel sheets for general purposes.
IS 3502
ASTM A109/A109M Specification for hot rolled carbon steel sheet and strip.
ASTM A123/A123M
Specification for cold-rolled carbon steel strip for general engineering purposes.
ASTM A167
Specification for cold-rolled medium, high carbon and low-alloy steel strip for
ASTM A176 general engineering purposes.
ASTM A240/A240M Specification for steel chequered plates.
Standard Specification for Steel, Strip, Carbon (0.25 Maximum Percent), Cold-Rolled.
Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel
Products.
Standard Specification for Stainless and Heat-Resisting Chromium-Nickel Steel Plate,
Sheet, and Strip.
Standard Specification for Stainless and Heat-Resisting Chromium Steel Plate, Sheet,
and Strip.
Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate,
Sheet, and Strip for Pressure Vessels and for General Applications.
BNBC 2015 FINAL DRAFT
ASTM A263 Standard Specification for Stainless Chromium Steel-Clad Plate.
ASTM A264
ASTM A285/A285M Specification for Stainless Chromium-Nickel Steel-Clad Plate.
ASTM A328/A328M Standard Specification for Pressure Vessel Plates, Carbon Steel, Low- and
ASTM A1008/A1008M Intermediate-Tensile Strength.
ASTM A414/A414M Standard Specification for Steel Sheet Piling.
ASTM A424/A424M Standard Specification for Steel, Sheet, Cold-Rolled, Carbon, Structural, High-
ASTM A929/A929M Strength Low-Alloy, High-Strength Low-Alloy with Improved Formability, Solution
Hardened, and Bake Harden able.
ASTM A463/A463M
ASTM A480/A480M Standard Specification for Steel, Sheet, Carbon, and High-Strength, Low-Alloy for
Pressure Vessels.
ASTM A505
Standard Specification for Steel, Sheet, for Porcelain Enameling.
ASTM A506
Standard Specification for Steel Sheet, Metallic-Coated by the Hot-Dip Process for
ASTM A507 Corrugated Steel Pipe.
Standard Specification for Steel Sheet, Aluminum-Coated, by the Hot-Dip Process.
Standard Specification for General Requirements for Flat-Rolled Stainless and Heat-
Resisting Steel Plate, Sheet, and Strip.
Standard Specification for Steel, Sheet and Strip, Alloy, Hot-Rolled and Cold-Rolled,
General Requirements for.
Standard Specification for Alloy and Structural Alloy Steel, Sheet and Strip, Hot-
Rolled and Cold-Rolled.
Standard Specification for Drawing Alloy Steel, Sheet and Strip, Hot-Rolled and Cold-
Rolled.
5-22 Vol. 1
Building Materials Chapter 2
ASTM A568/A568M Standard Specification for Steel, Sheet, Carbon, Structural, and High-Strength, Low-
ASTM A577/A577M Alloy, Hot-Rolled and Cold-Rolled, General Requirements for.
ASTM A578/A578M
ASTM A879/A879M Standard Specification for Ultrasonic Angle-Beam Examination of Steel Plates.
ASTM A599/A599M
ASTM A606/A606M Standard Specification for Straight-Beam Ultrasonic Examination of Rolled Steel
ASTM A635/A635M Plates for Special Applications.
ASTM A653/A653M Standard Specification for Steel Sheet, Zinc Coated by the Electrolytic Process for
ASTM A666 Applications Requiring Designation of the Coating Mass on Each Surface.
ASTM A690/A690M
Standard Specification for Tin Mill Products, Electrolytic Tin-Coated, Cold-Rolled
ASTM A775/A775M Sheet.
ASTM A792/A792M
ASTM A857/A857M Standard Specification for Steel, Sheet and Strip, High-Strength, Low-Alloy, Hot-
ASTM A875/A875M Rolled and Cold-Rolled, with Improved Atmospheric Corrosion Resistance.
Standard Specification for Steel, Sheet and Strip, Heavy-Thickness Coils, Hot-Rolled,
Alloy, Carbon, Structural, High-Strength Low-Alloy, and High-Strength Low-Alloy with
Improved Formability, General Requirements for.
Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-
Coated (Galvannealed) by the Hot-Dip Process.
Standard Specification for Annealed or Cold-Worked Austenitic Stainless Steel Sheet,
Strip, Plate, and Flat Bar.
Standard Specification for High-Strength Low-Alloy Nickel, Copper, Phosphorus Steel
H-Piles and Sheet Piling with Atmospheric Corrosion Resistance for Use in Marine
Environments.
Standard Specification for Epoxy-Coated Steel Reinforcing Bars.
Standard Specification for Steel Sheet, 55 % Aluminum-Zinc Alloy-Coated by the Hot-
Dip Process.
Standard Specification for Steel Sheet Piling, Cold Formed, Light Gage.
Standard Specification for Steel Sheet, Zinc-5 % Aluminum Alloy-Coated by the Hot-
Dip Process.
BNBC 2015 FINAL DRAFT
2.8.4 Steel Pipe, Tube and Fittings
These items shall conform to the following Standards:
BDS ISO 49:2008 Malleable cast iron fittings threaded to ISO 7-1.
BDS ISO 3419: 2008
BDS ISO 3545 - 3: 2008 Non - alloy and alloy steel butt-welding fittings.
BDS ISO 4144: 2008 Steel tubes and fittings - Symbols for use in specifications - Part 3: Tubular fittings
BDS ISO 4145: 2008 with circular cross-section.
BDS ISO 5251: 2008
ASTM A53/A53M Pipe work - Stainless steel fittings threaded in accordance with ISO 7-1.
ASTM A105/A105M Non-alloy steel fittings threaded to ISO 7-1.
ASTM A106/A106M
Stainless steel butt-welding fittings.
ASTM A134
Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded
and Seamless.
Standard Specification for Carbon Steel Forgings for Piping Applications.
Standard Specification for Seamless Carbon Steel Pipe for High-Temperature
Service.
Standard Specification for Pipe, Steel, Electric-Fusion (Arc)-Welded (Sizes NPS 16
and Over).
Bangladesh National Building Code 2015 5-23
Part 5 BNBC 2015 FINAL DRAFTStandard Specification for Electric-Fusion (Arc)-Welded Steel Pipe (NPS 4 and Over).
Building Materials
Standard Specification for Carbon Steel Forgings, for General-Purpose Piping.
ASTM A139/A139M
ASTM A181/A181M Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges,
ASTM A182/A182M Forged Fittings, and Valves and Parts for High-Temperature Service.
ASTM A234/A234M Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel
for Moderate and High Temperature Service.
ASTM A252
ASTM A254 Standard Specification for Welded and Seamless Steel Pipe Piles.
ASTM A268/A268M
Standard Specification for Copper-Brazed Steel Tubing.
ASTM A269
Standard Specification for Seamless and Welded Ferritic and Martensitic Stainless
ASTM A270 Steel Tubing for General Service.
ASTM A312/A312M Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing
for General Service.
ASTM A333/A333M
Standard Specification for Seamless and Welded Austenitic Stainless Steel Sanitary
ASTM A334/A334M Tubing.
ASTM A403/A403M Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic
ASTM A420/A420M Stainless Steel Pipes.
ASTM A423/A423M Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature
ASTM A450/A450M Service.
ASTM A500/A500M Standard Specification for Seamless and Welded Carbon and Alloy-Steel Tubes for
Low-Temperature Service.
ASTM A50
Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings.
ASTM A522/A522M
Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel
ASTM A524 for Low-Temperature Service.
ASTM A530/A530M Standard Specification for Seamless and Electric-Welded Low-Alloy Steel Tubes.
ASTM A589/A589M Standard Specification for General Requirements for Carbon and Low Alloy Steel
ASTM A618/A618M Tubes.
ASTM A632 Standard Specification for Cold-Formed Welded and Seamless Carbon Steel
Structural Tubing in Rounds and Shapes.
ASTM A707/A707M
Standard Specification for Hot-Formed Welded and Seamless Carbon Steel
Structural Tubing.
Standard Specification for Forged or Rolled 8 and 9% Nickel Alloy Steel Flanges,
Fittings, Valves, and Parts for Low-Temperature Service.
Standard Specification for Seamless Carbon Steel Pipe for Atmospheric and Lower
Temperatures.
Standard Specification for General Requirements for Specialized Carbon and Alloy
Steel Pipe.
Standard Specification for Seamless and Welded Carbon Steel Water-Well Pipe.
Standard Specification for Hot-Formed Welded and Seamless High-Strength Low-
Alloy Structural Tubing.
Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing
(Small-Diameter) for General Service.
Standard Specification for Forged Carbon and Alloy Steel Flanges for Low-
Temperature Service.
5-24 Vol. 1
Building Materials Chapter 2
ASTM A733 Standard Specification for Welded and Seamless Carbon Steel and Austenitic
ASTM A778 Stainless Steel Pipe Nipples.
ASTM A807/A807M
ASTM A865/A865M Standard Specification for Welded, Un-annealed Austenitic Stainless Steel Tubular
Products.
Standard Practice for Installing Corrugated Steel Structural Plate Pipe for Sewers
and Other Applications.
Standard Specification for Threaded Couplings, Steel, Black or Zinc-Coated
(Galvanized) Welded or Seamless, for Use in Steel Pipe Joints.
2.8.5 Steel Bars, Wire and Wire Rods
These shall conform to the following Standards.
BDS ISO 1035 - 1: 2006BNBC 2015 FINAL DRAFTHot-rolled steel bars-Part 1: Dimensions of round bars.
BDS ISO 1035 - 2: 2006
BDS ISO 1035 - 3: 2006 Hot-rolled steel bars-Part 2: Dimensions of square bars.
BDS ISO 1035 - 4: 2006
BDS ISO 4951 - 1: 2008 Hot-rolled steel bars-Part 3: Dimensions of flat bars.
BDS ISO 4951 - 2: 2008
Hot-rolled steel bars-Part 4: Tolerances.
BDS ISO 4951 - 3: 2008
High yield strength steel bars and sections - Part 1: General delivery requirements.
ASTM A29/A29M
High yield strength steel bars and sections - Part 2: Delivery conditions for
ASTM A49 normalized, normalized rolled and as-rolled steels.
ASTM A108 High yield strength steel bars and sections - Part 3: Delivery conditions for thermo
ASTM A116 mechanically-rolled steels.
ASTM A185/A185M
ASTM A227/A227M Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought, General
ASTM A228/A228M Requirements for.
ASTM A229/A229M
ASTM A276 Standard Specification for Heat-Treated Carbon Steel Joint Bars, Micro alloyed Joint
ASTM A311/A311M Bars, and Forged Carbon Steel Compromise Joint Bars.
ASTM A322 Standard Specification for Steel Bar, Carbon and Alloy, Cold-Finished.
ASTM A108
ASTM A368 Standard Specification for Metallic-Coated, Steel Woven Wire Fence Fabric.
ASTM A434
Standard Specification for Steel Welded Wire Reinforcement, Plain, for Concrete.
ASTM A475
ASTM A478 Standard Specification for Steel Wire, Cold-Drawn for Mechanical Springs.
ASTM A479/A479M Standard Specification for Steel Wire, Music Spring Quality.
Standard Specification for Steel Wire, Oil-Tempered for Mechanical Springs.
Standard Specification for Stainless Steel Bars and Shapes.
Standard Specification for Cold-Drawn, Stress-Relieved Carbon Steel Bars Subject to
Mechanical Property Requirements.
Standard Specification for Steel Bars, Alloy, Standard Grades.
Standard Specification for Steel Bar, Carbon and Alloy, Cold-Finished.
Standard Specification for Stainless Steel Wire Strand.
Standard Specification for Steel Bars, Alloy, Hot-Wrought or Cold-Finished,
Quenched and Tempered.
Standard Specification for Zinc-Coated Steel Wire Strand.
Standard Specification for Chromium-Nickel Stainless Steel Weaving and Knitting
Wire.
Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and
Other Pressure Vessels.
Bangladesh National Building Code 2015 5-25
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Building Materials
ASTM A492 Standard Specification for Stainless Steel Rope Wire.
ASTM A499
ASTM A510 Standard Specification for Steel Bars and Shapes, Carbon Rolled from “T” Rails.
ASTM A575 Standard Specification for General Requirements for Wire Rods and Coarse Round
ASTM A576 Wire, Carbon Steel.
ASTM A580/A580M
ASTM A586 Standard Specification for Steel Bars, Carbon, Merchant Quality, M-Grades.
ASTM A603 Standard Specification for Steel Bars, Carbon, Hot-Wrought, Special Quality.
ASTM A627
Standard Specification for Stainless Steel Wire.
ASTM A663/A663M
Standard Specification for Zinc-Coated Parallel and Helical Steel Wire Structural
ASTM A666 Strand.
ASTM A706/A706M Standard Specification for Zinc-Coated Steel Structural Wire Rope.
ASTM A764 Standard Test Methods for Tool-Resisting Steel Bars, Flats, and Shapes for
Detention and Correctional Facilities.
ASTM C933
Standard Specification for Steel Bars, Carbon, Merchant Quality, Mechanical
Properties.
Standard Specification for Annealed or Cold-Worked Austenitic Stainless Steel
Sheet, Strip, Plate, and Flat Bar.
Standard Specification for Low-Alloy Steel Deformed and Plain Bars for Concrete
Reinforcement.
Standard Specification for Metallic Coated Carbon Steel Wire, Coated at Size and
Drawn to Size for Mechanical Springs.
Standard Specification for Welded Wire Lath.
BNBC 2015 FINAL DRAFT
2.8.6 Steel Fasteners
Steel fasteners shall conform to the following Standards:
BDS 1373 : 1992 Slotted countersunk flat head tapping screws.
BDS 1374 : 1992 Slotted raised counter.
BDS 1375 : 1992 Fasteners hexagon products widths across flats.
BDS 1405: 1993 Bolts, screws, nuts and accessories terminology and nomenclature.
BDS 1406: 1993 Hexagon nuts style 2 products grades A and B.
BDS 1407: 1993 Hexagon nuts style 3 products grades A and B.
BDS 1408: 1993 General purpose screw threads general plan.
BDS 1409: 1993 General purpose screw threads selected sizes for screws, bolts and nuts.
BDS 1410: 1993 Thread run-outs for fasteners thread of BDS 1408: 1995 and BDS 1409: 1993.
BDS 1411: 1993 Tapping screws thread.
BDS 1412: 1993 Thread undercuts of external metric thread fasteners.
BDS 1413: 1993 Head configuration and gauging of countersunk head screws.
BDS 1428: 1993 Fasteners-bolts, screws, studs and nuts-symbols and designations of dimensions.
ASTM A31 Standard Specification for Steel Rivets and Bars for Rivets, Pressure Vessels.
ASTM A183 Standard Specification for Carbon Steel Track Bolts and Nuts.
ASTM A193/A193M Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High
Temperature or High Pressure Service and Other Special Purpose Applications.
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ASTM A194/A194M BNBC 2015 FINAL DRAFTStandard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or
High Temperature Service, or Both.
ASTM A307
ASTM A320/A320M Standard Specification for Carbon Steel Bolts and Studs, 60000 psi Tensile Strength.
ASTM A325 Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for Low-
Temperature Service.
ASTM A354
Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi
ASTM A437/A437M Minimum Tensile Strength.
ASTM A449 Standard Specification for Quenched and Tempered Alloy Steel Bolts, Studs, and
Other Externally Threaded Fasteners.
ASTM A489
ASTM A490 Standard Specification for Stainless and Alloy-Steel Turbine-Type Bolting Specially
Heat Treated for High-Temperature Service.
ASTM A502
ASTM A540/A540M Standard Specification for Hex Cap Screws, Bolts and Studs, Steel, Heat Treated,
ASTM A563 120/105/90 ksi Minimum Tensile Strength, General Use.
ASTM A574
ASTM C514 Standard Specification for Carbon Steel Lifting Eyes.
ASTM C954
Standard Specification for Structural Bolts, Alloy Steel, Heat Treated, 150 ksi
ASTM C955 Minimum Tensile Strength.
ASTM C1002 Standard Specification for Rivets, Steel, Structural.
ASTM F436 Standard Specification for Alloy-Steel Bolting for Special Applications.
ASTM F593
ASTM F594 Standard Specification for Carbons and Alloy Steel Nuts.
ASTM F844
ASTM F959 Standard Specification for Alloy Steel Socket-Head Cap Screws.
Standard Specification for Nails for the Application of Gypsum Board.
Standard Specification for Steel Drill Screws for the Application of Gypsum Panel
Products or Metal Plaster Bases to Steel Studs from 0.033 in. (0.84 mm) to 0.112 in.
(2.84 mm) in Thickness.
Standard Specification for Load-Bearing (Transverse and Axial) Steel Studs, Runners
(Tracks), and Bracing or Bridging for Screw Application of Gypsum Panel Products
and Metal Plaster Bases.
Standard Specification for Steel Self-Piercing Tapping Screws for the Application of
Gypsum Panel Products or Metal Plaster Bases to Wood Studs or Steel Studs.
Standard Specification for Hardened Steel Washers.
Standard Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs.
Standard Specification for Stainless Steel Nuts.
Standard Specification for Washers, Steel, Plain (Flat), Unhardened for General Use.
Standard Specification for Compressible-Washer-Type Direct Tension Indicators for
Use with Structural Fasteners.
2.8.7 Welding Electrodes and Wires
Welding electrodes and wires shall conform to the following Standards:
BDS 239: 1963 Specification for soft solder.
BDS 1442 - 1: 1994 Filler rods and wire for gas shielded arc-welding-ferric steel.
BDS 1442 - 2: 1994 Filler rods and wire for gas shielded arc-welding-austenitic stainless steel.
BDS 1442 - 3: 1994 Filler rods and wires for gas shielded arc welding-copper and copper alloy.
Bangladesh National Building Code 2015 5-27
Part 5 BNBC 2015 FINAL DRAFTFiller rods and wires for gas shielded arc welding-aluminum and aluminum alloy and
Building Materials magnesium alloys.
BDS 1442 - 4: 1994 Filler rods and wires for gas shielded arc welding-nickel and nickel alloys.
BDS 1442 - 5: 1994
IS 814 Specification for covered electrodes for manual metal arc welding of carbon and
IS 815 carbon manganese steel.
IS 1278
IS 1395 Classification and coding of covered electrodes for metal arc welding of structural
IS 3613 steels.
IS 4972
IS 6419 Specification for filler rods and wires for gas welding.
IS 6560
IS 7280 Specification for low and medium alloy steel covered electrodes for manual metal
IS 8363 arc welding.
ISO 9453
ISO 9454 Acceptance tests for wire flux combinations for submerged-arc welding of
structural steel.
ISO 9455-1
Specification for resistance spot-welding electrodes.
ISO 9455-8
Specification for welding rods and bare electrodes for gas shielded arc welding of
ISO 9455-11 structural steel.
ISO 9455-14 Specification for molybdenum and chromium-molybdenum low alloy steel welding
rods and bare electrodes for gas shielded arc welding.
Specification for base wire electrodes for submerged-arc welding of structural
steels.
Specification for bare wire electrodes for electro slag welding of steels.
Soft solder alloys-chemical compositions and forms.
Soft soldering fluxes-classification and requirements.
Part 1: Classification, labeling and packaging.
Soft soldering fluxes- test methods.
Part 1: Determination of non-volatile matter, gravimetric method.
Soft soldering fluxes-test methods.
Part 8: Determination of zinc content.
Soft soldering fluxes-test methods.
Part 11: Solubility of flux residues.
Soft soldering fluxes-test methods.
Part 14: Assessment of tackiness of flux residues.
2.9 TIMBER & WOOD PRODUCTS
2.9.1 Timber Types and Properties
Timber types for the structural purpose with their engineering characteristics are contained in Table 6.11.1 Part
6 of this Code. Details of the uses of timber in structures or elements of structures including terminology,
material requirements, and moisture content preferred cut sizes of sawn timbers, grading, permissible defects,
suitability in respect of durability and treatability, design criteria, and details of joints are also given in Chapter
11 Part 6. Timber and timber constructions shall satisfy the requirements of that Chapter and conform to the
following Standards:
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BDS 142: 1961 Specification for wood doors.
BDS 173: 1962 Specification for wood windows.
BDS 230: 1962 Glossary of terms applicable to timber, plywood and joinery.
BDS 803:1973 Trade names and abbreviated symbols for timber species.
BDS 819:1975 Code of practice for preservation of timber.
BDS 820:1978 Recommendation for maximum permissible moisture content of timber used for
different purposes in Bangladesh.
BDS 857:1977 Specification for grading rules for logs and sawn timbers.
BDS 1090:1984 Methods of test for plywood.
BDS 1256:1990 Classification of commercial timber.
BDS 1311:1990 Key for identification of commercial timber.
2.9.2 Plywood
A wood structural panel comprised of plies of wood veneer arranged in cross-aligned layers. The plies are
bonded with waterproof adhesive that cures on application of heat and pressure.
BNBC 2015 FINAL DRAFT
Plywood shall conform to the following Standards:
BDS 799: 1983 Specification for plywood for general purposes.
BDS 1158: 1986 Specification for veneered decorative plywood.
For sampling and testing of plywood, the following Standards are applicable:
BDS 1087: 1984 Specification for method of sampling of plywood.
BDS 1090: 1984 Methods of test of plywood.
IS 4990 Specification for plywood for concrete shattering work.
IS 5509 Specification for fire retardant plywood.
IS 5539 Specification for Preservative Treated Plywood.
2.9.3 Particle Boards and Fibre Boards
A panel primarily composed of cellulosic materials (usually wood), generally in the form of discrete pieces or
particles, as distinguished from fibers. The cellulosic material is combined with synthetic resin or other suitable
bonding system by a process in which the inter-particle bond is created by the bonding system under heat and
pressure.
Fiber boards are fibrous, homogeneous panel made from lingo-cellulosic fibers (usually wood or cane) and
having a density of less than 497 kg per cubic meter but more than 160 kg per cubic meter.
These materials shall conform to the following standards:
BDS 619:1967 Specification for particle board (medium density).
BDS 620:1967 Specification for hardboard.
BDS EN 316:2008 Wood fiberboards - Definition, classification and symbols.
ISO 820 Particle boards - Definition and classification.
ISO 821 Particle boards - Determination of dimensions of test pieces.
ISO 822 Particle boards - Determination of density.
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ISO 823 Particle boards - Determination of moisture content.
ISO 766 Fibre building boards - Determination of dimensions of test pieces.
ISO 767 Fibre building boards - Determination of moisture content.
ISO 768 Fibre building boards - Determination of bending strength.
ISO 769 Fibre building boards - Hard and medium boards-determination of.
Water Absorption and of Swelling in Thickness after Immersion in Water;
ISO 818 Fibre building boards - Definition - Classification.
ISO 819 Fibre building boards - Determination of density.
ISO 2695 Fibre building boards - Hard and medium boards for general.
Purposes-Quality Specifications-Appearance, Shape and Dimensional Tolerances;
ISO 2696 Fibre building boards - Hard and medium boards - Quality.
Specifications- Water Absorption and Swelling in Thickness;BNBC 2015 FINAL DRAFT
ISO 3340 Fibre building boards - Determination of sand content.
ISO 3346 Fibre building boards - Determination of surface finish (roughness).
ISO 3729 Fibre building boards - Determination of surface stability.
ISO/TR 7469 Dimensional stability of hardboards.
Wood based Laminates
Laminated boards having a core of strips, each not exceeding 7 mm in thickness, glued together face to face to
form a slab which in turn is glued between two or more veneers, with the direction of the grain of the core
strips running at right angles to that of the adjacent outer veneers.
Wood based laminates shall conform to the following Standards:
IS 3513 Specification for resin treated compressed wood laminates (compregs).
IS 3513 Part 3 For general purposes.
IS 9307 (Parts I to VIII) Specification for resin treated compressed wood laminates (compregs).
Part 4 Sampling and Tests.
Methods of tests for wood-based structural sandwich construction.
Part I Flexure test.
Part II Edgewise compression test.
Part III Flatwise compression test.
Part IV Shear test.
Part V Flatwise tension test.
Part VI Flexure creep test.
Part VII Cantilever vibration test.
Part VIII Weathering test.
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2.9.4 Adhesives and Glues
Adhesives and glues are used to join two or more parts so as to form a single unit. Adhesives shall conform to
the following Standards:
IS 848 Specification for synthetic resign adhesives for plywood (phenolic and
aminoplastic).
IS 849
IS 851 Specification for cold setting case in glue for wood.
IS 852 Specification for synthetic resin adhesives for construction work (nonstructural)
IS 4835 in wood.
IS 9188
Specification for animal glue for general wood-working purposes.
Specification for polyvinyl acetate dispersion-based adhesives for wood.
Specification for adhesive for structural laminated wood products for use under
exterior exposure condition.
2.10 DOORS, WINDOWS AND VENTILATORS
BNBC 2015 FINAL DRAFT
2.10.1 Wooden Doors, Windows and Ventilators
These shall conform to the following Standards:
BDS 142: 1961 Specification for wood door.
BDS 173: 1962 Specification for wood windows.
BDS 820: 1978 Recommendation for maximum permissible moisture content of timber used
BDS 1504: 1996 for different purposes in Bangladesh.
IS 1003 Timber door window and ventilator frames
Specification for timber panelled and glazed shutters.
IS 1826 Part 1- 2003 Door shutters.
IS 2191 Part 2- 1994 Window and ventilator shutters.
Specification for venetian blinds for windows.
IS 2202 Specification for wooden flush door shutters (cellular and hollow core type).
Part 1 Plywood face panels.
IS 4020 Part 2 Particle board face panels and hardboard face panels.
Specification for wooden flush door shutters (solid core type).
Part 1 Plywood face panels.
Part 2 Particle board face panels and hardboard face panels.
Method of tests for door shutters.
(Part 1): 1998 General.
(Part 2): 1998 Measurement of dimensions and squareness.
(Part 3): 1998 Measurement of general flatness.
(Part 4): 1998 Local planeness test.
(Part 5): 1998 Impact indentation test.
(Part 6): 1998 Flexure test.
(Part 7): 1998 Edge loading test.
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Building Materials
IS 4021 (Part 8): 1998 Shock resistance test.
IS 4962 (Part 9): 1998 Buckling resistance test.
IS 6198 (Part 10):1998 Slamming test.
(Part 11):1998 Misuse test.
(Part 12):1998 Varying humidity test.
(Part 13):1998 End immersion test.
(Part 14):1998 Knife test.
(Part 15):1998 Glue adhesion test.
(Part 16):1998 Screw withdrawal resistance test.
Specification for timber door, window and ventilator frames.
Specification for wooden side sliding doors.
Specification for ledged, braced and battened timber shutters.
2.10.2 Metal Doors, Windows Frames and VentilatorsBNBC 2015 FINAL DRAFT
These shall conform to the following Standards:
BDS 1270: 1990 Specification for strong room door
BDS 1273: 1990 Specification for vault doors.
IS 1038 Specification for steel doors, windows and ventilators.
IS 1361 Specification for steel windows for industrial buildings.
IS 1948 Specification for aluminum doors, windows and ventilators.
IS 1949 Specification for aluminum windows for industrial buildings.
IS 4351 Specification for steel door frames.
IS 6248 Specification for metal rolling shutters and rolling grills.
IS 7452 Specification for hot rolled steel sections for doors, windows and ventilators.
IS 10451 Specification for steel sliding shutters (top hung type).
IS 10521 Specification for collapsible gates.
2.10.3 Plastic Doors and Windows
These shall conform to the following Standards:
BDS EN 477: 2008 Unplasticized polyvinylchloride (PVC - U) profiles for the fabrication of windows and
BDS EN 478: 2008 doors - Determination of the resistance to impact of main profiles by falling mass.
BDS EN 479: 2008
BDS EN 513: 2008 Unplasticized polyvinylchloride (PVC - U) profiles for the fabrication of windows and
BDS EN 514: 2008 doors - Determination of appearance after exposure at 150oC.
Unplasticized polyvinylchloride (PVC - U) profiles for the fabrication of windows and
doors - Determination of heat reversion.
Unplasticized polyvinylchloride (PVC - U) profiles for the fabrication of windows and
doors - Determination of the resistance to artificial weathering.
Unplasticized polyvinylchloride (PVC - U) profiles for the fabrication of windows and
doors - Determination of the strength of welded corners and T-joints.
BDS EN 12608: 2008 Unplasticized polyvinylchloride (PVC - U) profiles for the fabrication of windows and
doors - Classification, requirements and test methods.
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BDS ISO 1163 - 1: 2008 Plastics - Unplasticized polyvinylchloride (PVC - U) molding and extrusion materials -
BDS ISO 1163 - 2: 2008 Part 1: Designation system and basis for specifications.
IS 14856
IS 15380 Plastics - Unplasticized polyvinylchloride (PVC - U) molding and extrusion materials -
Part 2: Preparation of test specimens and determination of properties.
Specification for glass fibre reinforced (GRP) panel type door shutters for internal
use.
Specification for molded raised high density fibre (HDF) panel doors.
2.11 ALUMINIUM AND ALUMINIUM ALLOYS
Aluminum used for structural purposes in buildings and structures shall comply with AA ASM 35 and AA ADM 1.
Aluminium and Aluminium Alloys shall also conform to the following Standards:
BDS EN 755 - 9: 2010 Aluminum and aluminum alloys - Extruded rod/bar, tube and profiles - Part 9:
Profiles, tolerances on dimensions and form.
BDS EN 755 - 2: 2010BNBC 2015 FINAL DRAFTAluminum and aluminum alloys - Extruded rod/bar, tube and profiles - Part 2:
Mechanical properties.
BDS EN 755 - 1: 2010 Aluminum and aluminum alloys - Extruded rod/bar, tube and profiles - Part 1:
Technical conditions for inspection and delivery.
BDS EN 755 - 3: 2010 Aluminum and aluminum alloys - Extruded rod/bar, tube and profiles - Part 3:
Round bars, tolerances on dimensions and form.
BDS EN 755 - 4: 2010 Aluminum and aluminum alloys - Extruded rod/bar, tube and profiles - Part 4:
Square bars, tolerances on dimensions and form.
BDS EN 755 - 5: 2010 Aluminum and aluminum alloys - Extruded rod/bar, tube and profiles - Part 5:
Rectangular bars, tolerances on dimensions and form.
BDS EN 755 - 6: 2010 Aluminum and aluminum alloys - Extruded rod/bar, tube and profiles - Part 6:
Hexagonal bars, tolerances on dimensions and form.
BDS EN 755 - 7: 2010 Aluminum and aluminum alloys - Extruded rod/bar, tube and profiles - Part 7:
Seamless tubes, tolerances on dimensions and form.
BDS EN 755 - 8: 2010 Aluminum and aluminum alloys - Extruded rod/bar, tube and profiles - Part 8:
Porthole tubes, tolerances on dimensions and form.
BDS EN 12020 - 1: 2010 Aluminum and aluminum alloys- Extruded precision profiles in alloys EN AW-6060
and EN AW-6063- Part 1: Technical conditions for inspection and delivery.
BDS EN 12020 - 2: 2010 Aluminum and aluminum alloys - Extruded precision profiles in alloys EN AW-6060
and EN AW-6063 - Part 2: Tolerances on dimensions and form.
BDS EN 515: 2010 Aluminum and aluminum alloys - Wrought products - Temper designations.
ASTM B26/B26M Standard Specification for Aluminum-Alloy Sand Castings.
ASTM B85/B85M Standard Specification for Aluminum-Alloy Die Castings.
ASTM B108/B108M Standard Specification for Aluminum-Alloy Permanent Mold Castings.
ASTM B209 Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate.
ASTM B210 Standard Specification for Aluminum and Aluminum-Alloy Drawn Seamless Tubes.
ASTM B211 Standard Specification for Aluminum and Aluminum-Alloy Bar, Rod, and Wire.
ASTM B221 Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods,
Wire, Profiles, and Tubes.
Bangladesh National Building Code 2015 5-33
Part 5 Standard Specification for Aluminum and Aluminum-Alloy Seamless Pipe and
Building Materials Seamless Extruded Tube.
ASTM B241/B241M Standard Specification for Aluminum-Alloy 6061-T6 Standard Structural Profiles.
ASTM B308/B308M Standard Specification for Aluminum and Aluminum-Alloy Round Welded Tubes.
ASTM B313/B313M
ASTM B316/B316M Standard Specification for Aluminum and Aluminum-Alloy Rivet and Cold-Heading
Wire and Rods.
ASTM B429/B429M
ASTM B483/B483M Standard Specification for Aluminum-Alloy Extruded Structural Pipe and Tube.
ASTM B547/B547M Standard Specification for Aluminum and Aluminum-Alloy Drawn Tube and Pipe for
General Purpose Applications.
ASTM B632/B632M
ASTM B745/B745M Standard Specification for Aluminum and Aluminum-Alloy Formed and Arc-Welded
ASTM E34 Round Tube.
Standard Specification for Aluminum-Alloy Rolled Tread Plate.
Standard Specification for Corrugated Aluminum Pipe for Sewers and Drains.
Standard Test Methods for Chemical Analysis of Aluminum and Aluminum-Base
Alloys.
BNBC 2015 FINAL DRAFT
2.12 BUILDERS HARDWARE
The applicable Standards are listed below:
BDS 113: 1986 Specification for latches and locks for doors in buildings.
IS 204 Specification for tower bolts.
Part 1 Ferrous metals.
Part 2 Nonferrous metals.
IS 205 Specification for nonferrous metal butt hinges.
IS 206 Specification for tee and strap hinges.
IS 208 Specification for door handles.
IS 281 Specification for mild steel sliding door bolts for use with padlock.
IS 362 Specification for parliament hinges.
IS 363 Specification for hasps and staples.
IS 364 Specification for fanlight catch.
IS 452 Specification for door springs, rat-tail type.
IS 453 Specification for double acting spring hinges.
IS 729 Specification for drawer locks, cupboard locks and box locks.
IS 1019 Specification for rim latches.
IS 1341 Specification for steel butt hinges.
IS 1823 Specification for floor door stoppers.
IS 1837 Specification for fanlight pivots.
IS 2209 Specification for mortise locks (vertical type).
IS 2681 Specification for nonferrous metal sliding door bolts for use with padlocks.
IS 3564 Specification for door closers (hydraulically regulated).
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IS 3818 BNBC 2015 FINAL DRAFTSpecification for continuous (piano) hinges.
IS 3828 Specification for ventilator chains.
IS 3843 Specification for steel back-flap hinges.
IS 3847 Specification for mortise night latches.
IS 4621 Specification for indicating bolts for use in public baths and lavatories.
IS 4948 Specification for welded steel wire fabric for general use.
IS 4992 Specification for door handles for mortise locks (vertical type).
IS 5187 Specification for flush bolts.
IS 5899 Specification for bathroom latches.
IS 5930 Specification for mortise latch (vertical type).
IS 6315 Specification for floor springs (hydraulically regulated) for heavy doors.
IS 6318 Specification for plastic window stays and fasteners.
IS 6343 Specification for door closers (pneumatically regulated) for light doors weighing up
to 40 kg.
IS 6602 Specification for ventilator poles.
IS 6607 Specification for rebated mortise locks (vertical type).
IS 7196 Specification for hold fast.
IS 7197 Specification for double action floor springs (without oil check) for heavy doors.
IS 7534 Specification for sliding locking bolts for use with padlocks.
IS 7540 Specification for mortise dead locks.
IS 8756 Specification for ball catches for use in wooden almirah.
IS 8760 Specification for mortise sliding door locks, with lever mechanism.
IS 9106 Specification for rising butt hinges.
IS 9131 Specification for rim locks.
IS 9460 Specification flush drop handle for drawer.
IS 9899 Specification for hat, coat and wardrobe hooks.
IS 10019 Specification for steel window stays and fasteners.
IS 10090 Specification for numerical.
IS 10342 Specification for curtain rail system.
IS 12817 Specification for stainless steel butt hinges.
IS 12867 Specification for PVC hand rails covers.
IS 14912 Specification for door closers concealed type (hydraulically regulated)
2.13 ROOF COVERINGS
2.13.1 Scope
The provisions of this Section shall govern the materials used for roof coverings.
2.13.2 Compatibility of Materials
All roofs and roof coverings shall be of materials that are compatible with each other and with the building or
structure to which the materials are applied.
Bangladesh National Building Code 2015 5-35
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Building Materials
2.13.3 Material Specifications and Physical Characteristics
All materials to be used in the construction of roofs and roof coverings shall conform to the applicable standards
listed in this Section. In the absence of applicable standards or when materials are of questionable suitability,
testing by an approved testing agency may be required by the building official to determine the character,
quality and limitations of use of the materials.
2.13.4 Weather Protection
All roofs shall be covered with approved roof coverings properly secured to the building or structure to resist
wind and rain. Roof coverings shall be designed, installed and maintained in accordance with approved
manufacturer's recommendations such that the roof covering shall serve to protect the building or structure.
2.13.5 Wind Resistance
All roofs and roof coverings shall be secured in place to the building or structure to withstand the wind loads.
2.13.6 Structural and Construction Loads
The structural roof components shall be capable of supporting the roof covering system and the material and
equipment loads that will be encountered during installation of the roof covering system.
2.13.7 Impact Resistance
Roof coverings shall resist impact damage based on the results of tests conducted in accordance with ASTM
D4272 or ASTM D3746.
2.13.8 Metal-Sheet Roof Coverings
Metal-sheet roof coverings installed over structural framing and decking shall comply with BDS 868, Galvanized
corrugated sheet roof and wall coverings; BDS 1122, Hot-dip galvanized steel sheet and coil; ASTM A755/A755M
or ASTM B101. Metal-sheet roof coverings shall be installed in accordance with approved manufacturer's
installation instructions.
2.13.9 Interlocking Clay or Cement Tile
Interlocking clay or cement tile shall be installed only over solid sheathing or spaced structural sheathing boards.
Interlocking clay or cement tile shall not be installed on roof slopes below one unit vertical in three units
horizontal (1:3). Horizontal battens shall be required on roof slopes over one unit vertical in two units horizontal
(1:2). Single layer underlayment is required over solid sheathing on all roof slopes. Reinforced underlayment
shall be required when spaced sheathing is used. Regardless of roof slope, the first three tile courses and all
tiles within 900 mm of roof edges, tiles at changes in roof slope or changes in slope direction, shall be fastened
to the roof. For the field of the roof, fastening is not required on roof slopes below one unit vertical in two units
horizontal (1:2). Every other tile course shall be fastened on roof slopes 1:2 to less than 1:1; and every tile shall
be fastened on roof slopes 1:1 and over. Tile overlap shall be in accordance with approved manufacturer's
installation instructions.
2.13.10 Non-interlocking Clay or Cement Tile
Non-interlocking clay or cement tile shall not be installed on roof slopes below one unit vertical in five units
horizontal (1:5). Double layer underlayment is required on roof slopes below one unit vertical in four units
horizontal (1:4). Single layer underlayment is required on all other roof slopes. Non-interlocking clay or cement
tile shall be secured to the roof with two fasteners per tile. The minimum tile overlap shall be 75 mm.
2.13.11 Roof Insulation
Rigid combustible roof insulation shall be permitted, provided the insulation is covered with approved roof
coverings directly applied thereto. In-situ lime concrete may be used on flat roofs of buildings. Minimum
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Building Materials Chapter 2
compacted thickness of such a layer shall be 75 mm and have adequate slope for drainage. The materials used
in lime concrete shall conform to the standards specified in Sec 2.5 of this Part.
2.13.12 Recovering and Replacement of Roof Coverings
New roof coverings shall not be installed without first removing existing roof coverings when the existing roof or
roof covering is water soaked or has deteriorated to the point that the existing roof or roof covering is not
acceptable as a base for additional roofing.
2.13.13 Reuse of Materials
Existing slate, clay or cement tile shall be permitted for reuse, except that damaged, cracked or broken slate or
tile shall not be reused. Existing vent flashings, metal edgings, drain outlets, collars and metal counter flashings
shall not be reused where rusted, damaged or deteriorated. Aggregate surfacing materials shall not be reused.
2.13.14 Applicable Standards
The applicable Standards for materials used in roofs and roof coverings are listed below:
BDS 868: 1978 BNBC 2015 FINAL DRAFTCode of practice for galvanized corrugated sheet roof and wall coverings.
BDS 1122: 1985
BDS EN 490: 2008 Specification for hot-dip galvanized steel and coil.
BDS EN 49l: 2008 Concrete roofing tiles and fittings for roof covering and all cladding - Product
specifications.
BDS EN 538: 2008
BDS EN 539-l: 2008 Concrete roofing tiles and fittings for roof covering and wall cladding - Test
methods.
BDS EN 1024: 2008
Clay roofing tiles for discontinuous laying - Flexural strength test.
BDS EN 1304: 2008
ASTM A755/A755M Clay roofing tiles for discontinuous laying Determination of physical characteristics -
Part 1: Impermeability test.
ASTM B101
Clay roofing tiles for discontinuous laying - Determination of geometric
ASTM C406 characteristics.
ASTM C836/C836M
Clay roofing tiles and fittings - Product definitions and specifications.
ASTM C1029
Standard Specification for Steel Sheet, Metallic Coated by the Hot-Dip Process and
ASTM D225 Pre-painted by the Coil-Coating Process for Exterior Exposed Building Products.
ASTM D226/D226M Standard Specification for Lead-Coated Copper Sheet and Strip for Building
Construction.
ASTM D227
Standard Specification for Roofing Slate.
ASTM D312
ASTM D450 Standard Specification for High Solids Content, Cold Liquid-Applied Elastomeric
Waterproofing Membrane for Use with Separate Wearing Course.
Standard Specification for Spray-Applied Rigid Cellular Polyurethane Thermal
Insulation.
Standard Specification for Asphalt Shingles (Organic Felt) Surfaced With Mineral
Granules.
Standard Specification for Asphalt-Saturated Organic Felt Used in Roofing and
Waterproofing.
Standard Specification for Coal-Tar-Saturated Organic Felt Used in Roofing and
Waterproofing.
Standard Specification for Asphalt Used in Roofing.
Standard Specification for Coal-Tar Pitch Used in Roofing, Damp proofing, and
Waterproofing.
Bangladesh National Building Code 2015 5-37
Part 5
Building Materials
ASTM D1227 BNBC 2015 FINAL DRAFTStandard Specification for Emulsified Asphalt Used as a Protective Coating for
Roofing.
ASTM D1863 Standard Specification for Mineral Aggregate Used on Built-Up Roofs.
ASTM D2178 Standard Specification for Asphalt Glass Felt Used in Roofing and Waterproofing.
ASTM D2626 Standard Specification for Asphalt-Saturated and Coated Organic Felt Base Sheet
Used in Roofing.
ASTM D2898 Standard Practice for Accelerated Weathering of Fire-Retardant-Treated Wood for
Fire Testing.
ASTM D3161 Standard Test Method for Wind-Resistance of Asphalt Shingles (Fan-Induced
Method).
ASTM D3747 Standard Specification for Emulsified Asphalt Adhesive for Adhering Roof
Insulation.
ASTM D3909 Standard Specification for Asphalt Roll Roofing (Glass Felt) Surfaced With Mineral
Granules.
ASTM D4272 Standard Test Method for Total Energy Impact of Plastic Films By Dart Drop.
ASTM D4434/D4434M Standard Specification for Poly (Vinyl Chloride) Sheet Roofing.
ASTM D4601 Standard Specification for Asphalt-Coated Glass Fiber Base Sheet Used in Roofing.
ASTM D4637 Standard Specification for EPDM Sheet Used In Single-Ply Roof Membrane.
ASTM D4897/D4897M Standard Specification for Asphalt-Coated Glass-Fiber Venting Base Sheet Used in
Roofing.
ASTM D6380 Standard Specification for Asphalt Roll Roofing (Organic Felt).
ASTM E108 Standard Test Methods for Fire Tests of Roof Coverings.
ASTM G90 Standard Practice for Performing Accelerated Outdoor Weathering of Nonmetallic
Materials Using Concentrated Natural Sunlight.
ASTM G154 Standard Practice for Operating Fluorescent Light Apparatus for UV Exposure of
Nonmetallic Materials.
ASTM G155 Standard Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-
Metallic Materials.
CGSB (Canadian Membrane, modified bituminous, prefabricated, and reinforced for roofing.
General Standards
Board) Approval standard for class I roof coverings.
37 - GP - 56M - 80 Standard laboratories department approved standard for class I insulated steel
FM 447 - 86 deck roofs.
FM ( Factory Manual) Wind design guide for ballasted single-ply roofing systems.
4450 - 89
RMA (Rubber Wind design guide for ballasted single-ply roofing systems.
Manufacturer
Association, USA)
RP - 4 - 88
SPRI (Single Ply Roofing
Institute, USA) - 86
5-38 Vol. 1
Building Materials Chapter 2
2.14 PAINTS AND VARNISHES
2.14.1 Water Based Paints and Pigments
Water based paints shall conform to the following Standards:
BDS 500: 1965 Specification for distemper dry.
BDS 1097: 1984 Specification for plastic emulsion paint.
Part 1 for Interior use.
IS 427:1965 Part 2 for Exterior use.
IS 428:2000 Specification for distemper, dry, color as required.
IS 5410:1992 Specification for distemper, washable.
IS 5411 Specification for cement paint, color as required.
Specification for plastic emulsion paint.
Part 1: For interior use.
Part 2: For exterior use
2.14.2 Ready Mixed Paints, Enamels and Powder CoatingsBNBC 2015 FINAL DRAFT
Ready mixed paints and enamels shall conform to the following Standards:
BDS 13: 1960 Specification for ready mixed paints, varnish, lacquers and related products.
BDS 14: 1960
BDS 397: 1964 Specification for black bituminous paint, brushing for general purposes.
BDS 398: 1964
BDS 399: 1964 Specification for ready mixed paint, brushing, red oxide zinc chrome, priming.
BDS 400: 1964
BDS 401: 1964 Specification for ready mixed paint, spraying, red oxide zinc chrome, priming.
BDS 402: 1989
Specification for aluminum paint, spraying for general purposes, in dual container.
BDS 499: 1965
Specification for aluminum paint, brushing, for general purposes in dual container.
BDS 616: 1966
Specification for varnish, finishing, exterior, type-I, (synthetic).
BDS 617: 1966
Specification for ready mixed paint, brushing, finishing, semi-gloss, for general
BDS 926: 1980 purposes.
BDS 927: 1980 Specification for ready mixed paints, brushing, for road marking (white, yellow and
black).
Specification for enamel, brushing, exterior (i) undercoating, (ii) finishing, color as
required.
Specification for enamel, brushing, interior (i) undercoating, (ii) finishing, color as
required.
Specification for ready mixed paint, brushing, petrol resisting, air drying, for exterior
painting of containers, color as required.
Specification for ready mixed paint, brushing, petrol resisting, air drying, for interior
painting of tanks and containers, red oxide (color unspecified).
BDS 928: 1980 Specification for ready mixed paint, brushing, acid resisting, for protection against
acid fumes, color as required.
BDS 973: 1981
Specification for specification and methods of test for linseed stand oil for paints and
BDS 974: 1981 varnishes.
BDS 1005: 1981
Specification and methods of test for raw tung oils for paints and varnishes.
Specification for ready mixed paint, brushing, finishing, stoving, enamel, color as
required.
Bangladesh National Building Code 2015 5-39
Part 5 Specification for ready mixed aluminum priming paints for woodwork.
Building Materials Specification for pavement marking paints.
Methods of sampling and test for paints, varnishes and related products:
BDS 1141: 1986 (Part l/Sec 1): Test on liquid paints (general and physical), Section 1 Sampling.
BDS 1151: 1986 (Part l/Sec 2): Test on liquid paints (general and physical), Section 2 Preliminary
IS 101 examination and preparation of samples for testing.
(Part l/Sec 3): Test on liquid paints (general and physical), Section 3 Preparation of
BNBC 2015 FINAL DRAFTpanels.
(Part l/Sec 4): Test on liquid paints (general and physical), Section 4 Brushing test.
(Part l/Sec 5): Test on liquid paints (general and physical), Section 5 Consistency.
(Part l/Sec 6): Test on liquid paints (general and physical), Section 6 Flash point.
(Part l/Sec 7): Test on liquid paints (general and physical), Section 7 Mass per 10
Iitres.
(Part 2/Sec 1): Test on liquid paints (chemical examination), Section 1 Water
content.
(Part 2/Sec 2): Test on liquid paints (chemical examination), Section 2 Volatile
matter.
(Part 3/Sec 1): Tests on paint film formation, Section 1 Drying time.
(Part 3/Sec 2): Tests on paint film formation, Section 2 Film thickness.
(Part 3/Sec 4): Tests on paint film formation, Section 4 Finish.
(Part 3/Sec 5): Tests on paint film formation, Section 5 Fineness of grind
(Part 4/Sec 1): Optical test, Section 1 Opacity.
(Part 4/Sec 2): Optical test, Section 2 Color.
(Part 4/Sec 3): Optical test, Section 3 Light fastness test.
(Part 4/Sec 4): Optical test, Section 4 Gloss.
(Part 5/Sec 1): Mechanical test on paint films, Section 1 Hardness tests.
(Part 5/Sec 2): Mechanical test on paint films, Section 2 Flexibility and adhesion.
(Part 5/Sec 3): Mechanical test on paint films, Section 3 Impact resistance.
(Part 5/Sec 4): Mechanical test on paint films, Section”4 Print free test.
(Part 6/Sec 1): Durability tests, Section 1 Resistance to humidity under conditions of
condensation.
(Part 6/Sec 2): Durability tests, Section 2 Keeping properties.
(Part 6/Sec 3): Durability tests, Section 3 Moisture vapour permeability.
(Part 6/Sec 4): Durability tests, Section 4 Degradation of coatings (pictorial aids for
evaluation).
(Part 6/Sec 5): Durability tests, Section 5 Accelerated weathering test.
(Part 7/Sec 1): Environmental tests on paint films, Section 1 Resistance to water.
(Part 7/Sec 2): Environmental tests on paint films, Section 2 Resistance to liquids.
(Part 7/Sec 3): Environmental tests on paint films, Section 3 Resistance to heat.
(Part 7/Sec 4): Environmental tests on paint films, Section 4 Resistance to bleeding
of pigments.
5-40 Vol. 1
Building Materials BNBC 2015 FINAL DRAFT Chapter 2
IS 104 (Part 8/Sec 1): Tests for pigments and other solids, Section 1 Residue on sieve.
IS 109 (Part 8/Sec 2): Tests for pigments and other solids, Section 2 Pigments and
IS 123 nonvolatile matter.
(Part 8/Sec 3): Tests for pigments and other solids, Section 3 Ash content.
IS 133 (Part 8/Sec 4): Tests for pigments and other solids, Section 4 Phthalic anhydride.
IS 137 (Part 8/Sec 5): Tests for pigments and other solids, Section 5 Lead restriction test.
IS 158 (Part 8/Sec 6): Tests for pigments and other solids, Section 6 Volume solids.
IS 168 (Part 9/Sec 1): Tests for lacquers and varnish, Section 1 Acid value.
IS 341 (Part 9/Sec 2): Tests for lacquers and varnish, Section 2 Rosin test.
IS 2074 Specification for ready mixed paint, brushing, zinc chrome, priming.
IS 2075
IS 2339 Specification for ready mixed paint, brushing, priming, plaster to Indian Standard
IS 2932 colors No. 361 and 631.
IS 2933 Specification for ready mixed paint, brushing, finishing, semi-gloss, for general
IS 3536 purposes, to Indian Standard colors No. 445, 446, 448, 449, 451 and 473; and red
IS 3537 oxide (color unspecified).
Specification for enamel, interior (a) undercoating, (b) finishing.
IS 3539 Specification for ready mixed paint, brushing, matt or egg-shell flat, finishing,
IS 3585 interior, to Indian Standard color, as required.
IS 3678 Specification for ready mixed paint, brushing, bituminous, black, lead-free, acid,
IS 8662 alkali, and heat resisting.
IS 9862 Specification for ready mixed paint, air-drying semi-glossy/matt, for general
IS 11883 purposes.
Specification for black Japan, Types A, B and C.
Specification for ready mixed paint, air drying red oxide-zinc chrome, priming.
Specification for ready mixed paint, stoving, red oxide-zinc chrome, priming.
Specification for aluminum paint for general purposes, in dual container.
Specification for enamel, synthetic, exterior, (a) undercoating, (b) finishing.
Specification for enamel, exterior, (a) undercoating, (b) finishing.
Specification for ready mixed ‘paint, brushing, wood primer.
Specification for ready mixed paint, finishing, interior for general purposes, to Indian
Standard colors No. 101, 216, 217, 219, 275, 281, 352, 353, 358 to 361, 363, 364,
388, 410, 442, 444, 628, 631, 632, 634, 693, 697, white and black.
Specification for ready mixed paint, undercoating, for use under oil finishes, to
Indian Standard colors, as required.
Specification for ready mixed paint, aluminum, brushing, priming, water resistant,
for wood work.
Specification for ready mixed paint, thick white, for lettering.
Specification for enamel, synthetic, exterior, (a) undercoating, (b) finishing, for
railway coaches.
Specification for ready mixed paint, brushing, bituminous black lead free, acid, alkali,
water and chlorine resisting.
Specification for ready mixed paint, brushing, red oxide, priming for metals.
Bangladesh National Building Code 2015 5-41
Part 5
Building Materials
IS 13183 Specification for aluminum paints, heat resistant.
IS 13213 Specification for polyurethane full gloss enamel (two pack).
IS 13607 Specification for ready mixed paint, finishing, general purposes, synthetic.
IS 13871 Specification for powder coatings.
2.14.3 Thinners and Solvents
These shall conform to the following Standards:
IS 324 Specification for ordinary denatured spirit.
IS 82 Methods of sampling and test for thinners and solvents for paints.
IS 324 Specification for ordinary denatured spirit.
IS 533 Specification for gum spirit of turpentine (oil of turpentine).
IS 14314 Specification for thinner general purposes for synthetic paints and varnishes.
2.14.4 Varnishes and Lacquers
BNBC 2015 FINAL DRAFT
These materials shall conform to the following Standards:
BDS 401: 1964 Specification for varnish, finishing, exterior, type-I, (synthetic).
BDS 1064: 1983 Specification for varnish, stoving.
BDS 1065: 1983 Specification for varnish, acid resisting.
BDS 1066: 1983 Specification for varnish, finishing, interior.
IS 337 Specification for varnish, finishing, interior.
IS 347 Specification for varnish, shellac for general purposes.
IS 348 Specification for french polish.
IS 524 Specification for varnish, finishing, exterior, synthetic.
IS 525 Specification for varnish, finishing, exterior and general purposes.
IS 642 Specification for varnish medium for aluminum paint.
2.15 SANITARY APPLIANCES AND WATER FITTINGS
2.15.1 Sanitary Appliances
Sanitary appliances shall conform to the following Standards:
ASHRAE 90A Energy conservation in new building design.
ASHRAE 90B Energy Conservation in New Building Design.
AWWA C700 Cold-Water Meters - Displacement type, bronze main case.
AWWA C701 Cold-Water Meters - Turbine type, for customer service.
AWWA C702 Cold-Water Meters - Compound type.
BDS 1162: 2006 Ceramic wash basin and pedestal, ceramic wash basin and pedestals dimension,
design & construction, type, permissible deviation
BDS 1163: 1987 Specification for Vitreous Sanitary Appliances,
Part-1, General requirements.
Part-2, Specific requirements for water closets;
5-42 Vol. 1
Building Materials Chapter 2
BDS 1361: 1992 Part-3, Specification requirements for urinal (bowl type).
BDS 1593: 1998 Part-4, Specific requirements for foot rest.
BS 1125 Part-5, Specific requirements for integrated squatting pans.
BS 1244 Faucets.
BS 1254 Plastic sanitary squatting pan.
BS 1329 Specification for WC flushing cisterns (including dual flash cisterns and flush pipes).
BS 1876 Metal Sink for domestic purposes.
Specification for C seats (plastics).
Specification for metal hand rinse basins.
Specification for automatic flushing cistern for urinals.
2.15.2 Pipes and Pipe Fittings for Water Supply and Sanitation
Pipes and pipe fittings for water supply and sanitation shall comply with the following Standards.
BNBC 2015 FINAL DRAFT
BDS 1111:1984 Centrifugally cast (spun) iron pressure pipes for water, gas and sewage.
BDS 1356:1992
BDS 1357: 1992 Specification for ferrules for water services.
BDS 1361 : 1992
Specification for washers with fittings for water service.
BDS 1562:1997
BDS 1593 : 1998 Faucets.
BDS EN 1254 ‐ 2: 2009 This standard specifies the technical requirements of various types of Faucets.
BDS EN 1717: 2009 Solvent cements for polyvinylchloride (PVC) plastic pipe and fitting.
BDS EN 14506: 2009 Plastic sanitary squatting pan.
BDS ISO 3419: 2008 Pan lays down the requirement for material, dimension physical requirements and
BDS ISO 5251: 2008 testing for power flush type injection molded high density polyethylene (HDPE) or
BDS ISO 6761: 2008 polypropylene (PP) squatting pan.
BDS ISO 3822 - 1: 2009
Copper and copper alloys ‐ Plumbing fittings - Part 2: Fittings with compression
BDS ISO 3822 ‐ 2: 2009 ends for use with copper tubes.
Protection against pollution of potable water in water installations and general
requirements of devices to prevent pollution by backflow.
Devices to prevent pollution by backflow of potable water - Automatic diverter -
Family H, type C.
Non - alloy and alloy steel butt-welding fittings.
Stainless steel butt-welding fittings.
Steel tubes - Preparation of ends of tubes and fittings for welding.
Acoustics: Laboratory tests on noise emission from appliances and equipment
used in water supply installations - Part 1: Method of measurement.
Acoustics: Laboratory tests on noise emission from appliances and equipment
used in water supply installations - Part 2: Mounting and operating conditions for
draw‐off taps and mixing valves.
BDS ISO 3822 ‐ 4: 2009 Acoustics: Laboratory tests on noise emission from appliances and equipment
BDS ISO 161 - 1: 2008 used in water supply installations - Part 4: Mounting and operating conditions for
special appliances.
Thermoplastics pipes for the conveyance of fluids Nominal outside diameters and
Nominal Pressures- Part 1: Metric series.
Bangladesh National Building Code 2015 5-43
Part 5
Building Materials
BDS ISO 161 - 2: 2008 BNBC 2015 FINAL DRAFTThermoplastics pipes for the conveyance of fluids- Nominal outside diameters and
BDS ISO 265 - 1: 2008 Nominal Pressures- Part 2: Inch - based series.
BDS ISO 1167 - 1: 2008 Pipes and fittings of plastics materials- fittings for domestic and industrial waste
BDS ISO 1167 - 2: 2008 pipes- Basic dimensions: Metric series- Part 1: Un-plasticized Poly (Vinyl chloride)
(PVC-U).
BDS ISO 1746 : 2008
BDS ISO 2505 : 2008 Thermoplastics pipes fittings and assemblies for the conveyance of fluids -
BDS ISO 2507-2 : 2008 Determination of the resistance to internal pressure- Part 1: General method.
BDS ISO 3114: 2008 Thermoplastics pipes fittings and assemblies for the conveyance of fluids-
BDS ISO 3126 : 2008 Determination of the resistance to internal pressure- Part 2: Preparation of pipe
BDS ISO 3127: 2008 test pieces.
BDS ISO 3501: 2010
BDS ISO 3503: 2010 Rubber or Plastics hoses and tubing-bending tests.
BDS ISO 3633: 2008
BDS ISO 6964: 2010 Thermoplastics pipes- Longitudinal reversion - Test method and parameters.
BDS ISO 4065: 2008
BDS ISO /TR 4191: 2008 Thermoplastics pipes and fittings - Vista softening temperature- Part 2: Test
BDS ISO 4422 - 1: 2008 conditions for Un-plasticized polyvinylchloride (PVC-U) or chlorinated
BDS ISO 4422 - 2: 2008 polyvinylchloride (PVC-C) pipes and fittings and for high impact resistance
BDS ISO 4422 - 3: 2008 polyvinylchloride (PVC-HI) pipes.
BDS ISO 4422 - 4: 2008
BDS ISO 4422 - 5: 2008 Unplasticized polyvinylchloride (PVC) pipes for potable water supply-Extractability
BDS ISO 4433 - 3: 2008 of lead and tin- Test method.
Plastics piping systems - Plastics components- Determination of dimensions.
Thermoplastics pipes - Determination of resistance to external blows-round-the-
clock method.
Assembled joints between fittings and polyethylene (PE) pressure pipes - Test of
resistance to pull-out.
Assembled joints between fittings and polyethylene (PE) pressure pipes - Test of
leak proofness under internal pressure when subjected to bending.
Plastics piping systems for soil and waste discharge (low and high temperature)
inside buildings - Specifications.
Polyolefin pipes and fittings - Determination of carbon black content by
calcinations and pyrolysis - Test method and basic specification.
Thermoplastics pipes- Universal wall thickness table.
Unplasticized polyvinylchloride (PVC-U) pipes for water supply-Recommended
practice for laying.
Pipes and fittings made of unplasticized polyvinylchloride (PVC-U) for water supply
- Specifications - Part 1: General.
Pipes and fittings made of unplasticized polyvinylchloride (PVC-U) for water supply
- Specifications - Part 2: Pipes (with or without integral sockets).
Pipes and fittings made of unplasticized polyvinylchloride (PVC-U) for water
supply- Specifications - Part 3: Fittings and joints.
Pipes and fittings made of unplasticized polyvinylchloride (PVC-U) for water
supply- Specifications- Part 4: Valves and ancillary equipment.
Pipes and fittings made of unplasticized polyvinylchloride (PVC- U) for water
supply- Specifications- Part 5: Fitness for purpose of the system.
Thermoplastics pipes- Resistance to liquid chemicals- Classification-Part 3:
Unplasticized polyvinylchloride (PVC-U), high- impact polyvinylchloride (PVC-HI)
and chlorinated polyvinylchloride (PVC -C) pipes.
5-44 Vol. 1
Building Materials Chapter 2
BDS ISO 4435: 2008 Plastic piping systems for non- pressure underground drainage and sewerage-
BDS ISO 4439: 2008 Unplasticized polyvinylchloride (PVC-U).
BDS ISO 6259 - 1: 2008
BDS ISO 6259 - 2: 2008 Unplasticized polyvinylchloride (PVC) pipes and fittings - Determination and
specification of density.
BDS ISO 6992: 2008
BDS ISO 9624: 2010 Thermoplastics pipes - Determination of tensile properties - Part 1: General test
BDS ISO 11413: 2010 method.
BDS ISO 12176 - 2: 2010 Thermoplastics pipes - Determination of tensile properties- Part 2: Pipes made of
BDS ISO 12176-3: 2010 unplasticized polyvinylchloride (PVC-U), Chlorinated polyvinylchloride (PVC-C), and
BDS ISO 12176 - 4: 2010 high - impact polyvinylchloride (PVC-HI).
BDS ISO 13479: 2010
BDS ISO 13761: 2010 Unplasticized polyvinylchloride (PVC-U) pipes for drinking water supply -
BDS ISO 13951: 2010 Extractability of cadmium and mercury occurring as impurities.
BDS ISO 13953: 2010
Thermoplastics pipes for fluids under pressure - Mating dimensions of flange
adapters and loose backing flanges.
Plastics pipes and fittings - Preparation of test piece assemblies between a
polyethylene (PE) pipe and an electro fusion fitting BDS ISO 11414, Plastics pipes
and fittings - Preparation of polyethylene (PE) pipe/pipe or pipe/fitting test piece
assemblies by butt fusion.
Plastics pipes and fittings - Equipment for fusion jointing polyethylene systems -
Part 2: Electro fusion
Plastics pipes and fittings - Equipment for fusion jointing polyethylene systems -
Part 3: Operator’s badge.
Plastics pipes and fittings - Equipment for fusion jointing polyethylene systems -
Part 4: Traceability coding.
Polyolefin pipes for the conveyance of fluids - Determination of resistance to crack
propagation - Test method for slow crack growth on notched pipes (notch test).
Plastics pipes and fittings - Pressure reduction factors for polyethylene pipeline
systems for use at temperatures above 20°C.
Plastics piping systems - Test method for the resistance of polyolefin pipe/pipe or
pipe/fitting assemblies to tensile loading.
Polyethylene (PE) pipes and fittings - Determination of the tensile strength and
failure mode of test pieces from a butt-fused joint.
BNBC 2015 FINAL DRAFT
BDS ISO 13954: 2010 Plastics pipes and fittings - Peel de-cohesion test for polyethylene (PE) electro
BDS ISO 13955: 2010 fusion assemblies of nominal outside diameter greater than or equal to 90 mm.
BDS ISO 13957: 2010
BDS ISO 14236: 2010 Plastics pipes and fittings - Crushing de-cohesion test for polyethylene (PE) electro
BDS ISO 18553: 2010 fusion assemblies.
BDS ISO 18553: 2010
BDS ISO 4427 - 1: 2010 Plastics pipes and fittings - Polyethylene (PE) tapping tees - Test method for impact
resistance.
Plastics pipes and fittings - Mechanical-joint compression fittings for use with
polyethylene pressure pipes in water supply systems.
Method for the assessment of the degree of pigment or carbon black dispersion in
polyolefin pipes, fittings and compounds.
Method for the assessment of the degree of pigment or carbon black dispersion in
polyolefin pipes, fittings and compounds Amendment 1:2010.
Plastics piping systems - Polyethylene (PE) pipes and fittings for water supply - Part
1: General.
Bangladesh National Building Code 2015 5-45
Part 5
Building Materials
BDS ISO 4427 - 2: 2010BNBC 2015 FINAL DRAFTPlastics piping systems - Polyethylene (PE) pipes and fittings for water supply - Part
2: Pipes.
BDS ISO 4427 - 3: 2010
Plastics piping systems - Polyethylene (PE) pipes and fittings for water supply - Part
BDS ISO 4427 - 5: 2010 3: Fittings.
BDS ISO 4427 - 1: 2010 Plastics piping systems - Polyethylene (PE) pipes and fittings for water supply - Part
5: Fitness for purpose of the system.
BDS ISO 3458: 2010
Plastics piping systems - Polyethylene (PE) pipes and fittings for water supply - Part
BDS ISO 3459: 2010 1: General Technical corrigendum 1: 2010.
ASTM A53/A53M Assembled joints between fittings and polyethylene (PE) pressure pipes - Test of
leak proofness under internal pressure.
ASTM A74
ASTM A377 Polyethylene (PE) pressure pipes - Joints assembled with mechanical fittings -
ASTM B42 Internal under pressure test method and requirement.
ASTM B43
ASTM B75 Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded
ASTM B88 and Seamless.
ASTM B251
Standard Specification for Cast Iron Soil Pipe and Fittings.
ASTM B302
ASTM B306 Standard Index of Specifications for Ductile-Iron Pressure Pipe.
ASTM B429/B429M
ASTM B447 Standard Specification for Seamless Copper Pipe, Standard Sizes.
ASTM B745/B745M
ASTM C14 Standard Specification for Seamless Red Brass Pipe, Standard Sizes.
ASTM C76 Standard Specification for Seamless Copper Tube.
ASTM C654 Standard Specification for Seamless Copper Water Tube.
ASTM C700
Standard Specification for General Requirements for Wrought Seamless Copper
ASTM D1527 and Copper-Alloy Tube.
ASTM D1785 Standard Specification for Thread-less Copper Pipe, Standard Sizes.
ASTM D2239 Standard Specification for Copper Drainage Tube (DWV).
ASTM D2241 Standard Specification for Aluminum-Alloy Extruded Structural Pipe and Tube.
Standard Specification for Welded Copper Tube.
Standard Specification for Corrugated Aluminum Pipe for Sewers and Drains.
Standard Specification for Non-reinforced Concrete Sewer, Storm Drain, and
Culvert Pipe.
Standard Specification for Reinforced Concrete Culvert, Storm Drain, and Sewer
Pipe.
Standard Specification for Porous Concrete Pipe.
Standard Specification for Vitrified Clay Pipe, Extra Strength, Standard Strength,
and Perforated.
Standard Specification for Acrylonitrile-Butadiene-Styrene (ABS) Plastic Pipe,
Schedules 40 and 80.
Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80,
and 120.
Standard Specification for Polyethylene (PE) Plastic Pipe (SIDR-PR) Based on
Controlled Inside Diameter.
Standard Specification for Poly(Vinyl Chloride) (PVC) Pressure-Rated Pipe (SDR
Series).
5-46 Vol. 1
Building Materials Chapter 2
ASTM D2321 BNBC 2015 FINAL DRAFTStandard Practice for Underground Installation of Thermoplastic Pipe for Sewers
and Other Gravity-Flow Applications ASTM D2464 Standard Specification for
ASTM D2466 Threaded Polyvinyl Chloride (PVC) Plastic Pipe Fittings, Schedule 80.
ASTM D2609 Standard Specification for Polyvinyl Chloride (PVC) Plastic Pipe Fittings, Schedule
ASTM D2661 40ASTM D2467 Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Pipe
Fittings, Schedule 80.
ASTM D2665
ASTM D2672 Standard Specification for Plastic Insert Fittings for Polyethylene (PE) Plastic Pipe.
ASTM D2729
ASTM D2737 Standard Specification for Acrylonitrile-Butadiene-Styrene (ABS) Schedule 40
ASTM D2751 Plastic Drain, Waste, and Vent Pipe and Fittings.
ASTM D2846/D2846M Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Drain, Waste, and Vent
Pipe and Fittings.
ASTM D2949
Standard Specification for Joints for IPS PVC Pipe Using Solvent Cement.
ASTM D3034
Standard Specification for Poly(Vinyl Chloride) (PVC) Sewer Pipe and Fittings.
ASTM F405
ASTM F409 Standard Specification for Polyethylene (PE) Plastic Tubing.
ASTM F437 Standard Specification for Acrylonitrile-Butadiene-Styrene (ABS) Sewer Pipe and
Fittings.
ASTM F438
Standard Specification for Chlorinated Poly(Vinyl Chloride) (CPVC) Plastic Hot- and
ASTM B209 Cold-Water Distribution Systems.
ASTM F441/F441M
Standard Specification for 3.25-in. Outside Diameter Poly(Vinyl Chloride) (PVC)
ASTM F442/F442M Plastic Drain, Waste, and Vent Pipe and Fittings.
ASTM F628 Standard Specification for Type PSM Poly(Vinyl Chloride) (PVC) Sewer Pipe and
Fittings.
ASTM F891
Standard Specification for Corrugated Polyethylene (PE) Pipe and Fittings.
IS 404 (Part-I)
ISO 2531 Standard Specification for Thermoplastic Accessible and Replaceable Plastic Tube
ASME/ANSI B16.3 and Tubular Fittings.
ASME/ANSI B16.485
ASME/ANSI B16.9 Standard Specification for Threaded Chlorinated Poly(Vinyl Chloride) (CPVC) Plastic
Pipe Fittings, Schedule 80.
Standard Specification for Socket-Type Chlorinated Poly(Vinyl Chloride) (CPVC)
Plastic Pipe Fittings, Schedule 40.
Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate.
Standard Specification for Chlorinated Poly(Vinyl Chloride) (CPVC) Plastic Pipe,
Schedules 40 and 80.
Standard Specification for Chlorinated Poly(Vinyl Chloride) (CPVC) Plastic Pipe
(SDR-PR).
Standard Specification for Acrylonitrile-Butadiene-Styrene (ABS) Schedule 40
Plastic Drain, Waste, and Vent Pipe With a Cellular Core.
Standard Specification for Coextruded Poly(Vinyl Chloride) (PVC) Plastic Pipe With
a Cellular Core.
Specification for lead pipes Part I for other than chemical purpose.
Ductile Iron pipes, fittings and accessories for pressure pipelines.
Malleable iron threaded fittings: Classes 150 and 300.
Cast Iron threaded fittings.
Factory made wrought steel butt welding fittings.
Bangladesh National Building Code 2015 5-47
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Building Materials
ASME/ANSI B16.11 Forged Steel Fittings, Socket-Welding and Threaded.
ASME/ABSI B16.12 Cast-Iron Threaded Drainage Fittings;
ASME/ANSI B16.15
ASME/ANSI B16.18 Cast Copper Alloy Threaded Fittings: Classes 125 and 250.
ASME/ANSI B16.22 Cast Copper Alloy Solder Joint Pressure Fittings.
ASME/ANSI B16.23 Wrought Copper and Copper Alloy Solder Joint Pressure Fittings.
ASME/ANSI B16.28 Cast Copper Alloy Solder Joint Drainage Fittings (DWV).
ASME/ANSI B16.29 Wrought Steel Butt welding Short radius Elbows and Returns.
Wrought Copper and Wrought Copper Alloy Solder Joint Fittings for solvent
ASME/ANSI B16.32 Drainage Systems.
AWWA C110 Cast Copper Alloy Solder Joint Fittings for Solvent Drainage Systems.
Standard for Grey Iron and Ductile Iron Fittings, 76 mm to 1220 mm (3 in. through
48 inches), for Water and Other Liquids.
2.15.3 Joints and Connections Between Pipes and Fittings
BNBC 2015 FINAL DRAFT
Applicable standards for joints and connections between pipes and fittings are listed below:
BDS EN 681-1 Elastomeric seals - Materials requirements for pipe joint seals used in water and
drainage applications - Part 1: Vulcanized rubber.
BDS EN 681-2
Elastomeric seals - Materials requirements for pipe joint seals used in water and
ASTM B42 drainage applications - Part 2: Thermoplastic elastomers.
ASTM C425
ASTM C443 Standard Specification for Seamless Copper Pipe, Standard Sizes.
ASTM C564 Standard Specification for Compression Joints for Vitrified Clay Pipe and Fittings.
ASTM D2235
Standard Specification for Joints for Concrete Pipe and Manholes, Using Rubber
ASTM D2564 Gaskets.
ASTM D2657 Standard Specification for Rubber Gaskets for Cast Iron Soil Pipe and Fittings.
ASTM D2661
Standard Specification for Solvent Cement for Acrylonitrile-Butadiene-Styrene
ASTM D2846/D2846M (ABS) Plastic Pipe and Fittings.
ASTM D2855 Standard Specification for Solvent Cements for Poly(Vinyl Chloride) (PVC) Plastic
Piping Systems.
Standard Practice for Heat Fusion Joining of Polyolefin Pipe and Fittings.
Standard Specification for Acrylonitrile-Butadiene-Styrene (ABS) Schedule 40
Plastic Drain, Waste, and Vent Pipe and Fittings.
Standard Specification for Chlorinated Poly(Vinyl Chloride) (CPVC) Plastic Hot- and
Cold-Water Distribution Systems.
Standard Practice for Making Solvent-Cemented Joints with Poly(Vinyl Chloride)
(PVC) Pipe and Fittings.
ASTM D3139 Standard Specification for Joints for Plastic Pressure Pipes Using Flexible
ASTM D3212 Elastomeric Seals.
ASTM F402
ASTM F493 Standard Specification for Joints for Drain and Sewer Plastic Pipes Using Flexible
Elastomeric Seals.
Standard Practice for Safe Handling of Solvent Cements, Primers, and Cleaners
Used for Joining Thermoplastic Pipe and Fittings.
Standard Specification for Solvent Cements for Chlorinated Poly(Vinyl Chloride)
(CPVC) Plastic Pipe and Fittings.
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ASTM F628 Standard Specification for Acrylonitrile-Butadiene-Styrene (ABS) Schedule 40
ASTM F656 Plastic Drain, Waste, and Vent Pipe With a Cellular Core.
ASME/ANSI B1.20.1
Standard Specification for Primers for Use in Solvent Cement Joints of Poly(Vinyl
Chloride) (PVC) Plastic Pipe and Fittings.
Pillar taps used in water supply.
2.15.4 Taps and Valves
Taps and valves shall conform to the following Standards:
BDS 987 BNBC 2015 FINAL DRAFTSand cast brass screw‐down bib taps and stop taps for water services.
BDS 1507 It covers the requirements regarding materials, dimensions, constructions,
BDS 1508 workmanship, finish and testing of tapes for water services.
BDS 1509 Bib taps used in water supply.
BDS EN 200
Stop taps used in water supply specifies the requirements, dimensions
BDS EN 246 construction, materials and test methods of stop taps used in water supply.
BDS EN 248
BDS EN 1112 Pillar taps used in water supply.
BDS EN 1113 Sanitary tapware - Single taps and combination taps for water supply systems of
type 1 and type 2 - General technical specification.
BS 1212 (3 Parts)
BS 1010 Sanitary tapware - General specifications for flow rate regulators.
BS 1968
BS 5433 Sanitary tapware - General specification for electrodeposited coatings of Ni‐Cr.
BS 2456
BS 1415 ( 2 parts) Sanitary tapware ‐ Shower outlets for sanitary tapware for water supply systems
BS 5163 of type 1 and type 2 - General technical specification.
Sanitary tapware - Shower hoses for sanitary tapware for water supply systems of
BS 3377 type 1 and type 2 - General technical specification.
BS 843 Specification for Float Operated Valves (excluding floats).
BS 855 Specification for draw-off taps and stop valves for water services.
Specification for floats for ball valves (copper).
Specification for underground stop valves for water services (copper).
Specification for floats for ball valves (plastic) for cold and hot water.
Mixing valves (manually operated).
Specification for predominantly key-operated cast iron wedge gate valve for water
works.
Specification for boilers for use with domestic solid mineral fuel appliances.
Specification for thermal storage electric water heaters.
Specification for welded steel boilers for central heating and indirect hot water
supply.
2.16 MISCELLANEOUS MATERIALS
2.16.1 Ferrocement
Details including material requirements are given in Chapter 12 Part 6.
2.16.2 Plastics
Plastics may be used in buildings or structures as light transmitting materials such as glazing, skylights, lighting
lenses, luminous ceilings, roof panels, signs and similar purposes. Foam plastics are also used in buildings.
Bangladesh National Building Code 2015 5-49
Part 5
Building Materials
Applicants for approval of a plastic material shall furnish all necessary technical data required by the Building
Official. The data shall include chemical composition; applicable physical, mechanical and thermal properties
such as fire resistance, flammability and flame spread; weather resistance; electrical properties; products of
combustion; and coefficient of expansion.
The requirements for light transmitting plastics, including roof panels and foam plastics are given below.
2.16.2.1 Light Transmitting Plastics
An approved light transmitting plastic shall be any thermoplastic, thermosetting or reinforced thermosetting
plastic material which has a self-ignition temperature of 343oC or greater when tested in accordance with , Test
Method for Ignition Properties of Plastics; a smoke density rating not greater than 450 when tested in the
manner intended for use in accordance with ASTM E84 Test Method for Surface Burning Characteristics of
Building Materials; or not greater than 75 when tested in the thickness intended for use in accordance with
ASTM D2843 Test Method for Density of Smoke from the Burning or Decomposition of Plastics; and which
conforms to one of the following combustibility classifications:
Class C1 : Plastic materials which have a burning extent of 25 mm or less when tested at a nominal thickness of
1.5 mm, or in the thickness intended for use, in accordance with ASTM D635 Test Method for Rate of Burning
and/or Extent and Time of Burning of Self-Supporting Plastics in Horizontal Position; or
BNBC 2015 FINAL DRAFT
Class C2: Plastic materials which have a burning rate of 63 mm/min or less when tested at a nominal thickness
of 1.5 mm, or in the thickness intended for use, in accordance with ASTM D635.
2.16.2.2 Foam Plastics
All foam plastics and foam plastic cores of manufactured assemblies shall have a flame spread rating of not
more than 75 and shall have a smoke developed rating of not more than 450 when tested in the maximum
thickness intended for use in accordance with ASTM E84.
All foam plastics, unless otherwise indicated in this Section, shall be separated from the interior of a building by
an approved thermal barrier of 13 mm gypsum wall board or equivalent thermal barrier material which will limit
the average temperature rise of the unexposed surface to not more than 121oC after 15 minutes of fire
exposure complying with the standard time-temperature curve of ASTM E119 Test Methods for Fire Tests of
Building Construction and Materials. The thermal barrier shall be installed in such a manner that it will stay in
place for a minimum of 15 minutes under the same testing conditions. The thermal barrier is not required when
the foam plastic is protected by a 25 mm minimum thickness of masonry or concrete.
2.16.2.3 Applicable Standards
A list of applicable Standards for plastics is given below:
BDS 885:1979 Method for measuring viscosity number and K-value of PVC resins.
BDS 886:1978 Method for direct measuring the specific gravity of plastics.
BDS 887:1978 Method for measuring deformation under heat of flexible rigid PVC compounds.
BDS 888:1978 Method for measuring temperature of deflection under load.
BDS 889:1978 Method for measuring the Vicat Softening Temperature (VST) of thermoplastics.
BDS 890:1978 Method for measuring the water absorption at room temperature and boiling water
absorption of plastics.
BDS 891:1978 Method for measuring the flexural modulus of plastics.
BDS 892:1978 Method for measuring the resistance to tear propagation of flexible plastics, film or
sheeting.
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ASTM D543 Standard Practices for Evaluating the Resistance of Plastics to Chemical Reagents.
ASTM D635 Standard Test Method for Rate of Burning and/or Extent and Time of Burning of Plastics in
a Horizontal Position.
ASTM D638 Standard Test Method for Tensile Properties of Plastics.
ASTM D695 Standard Test Method for Compressive Properties of Rigid Plastics.
ASTM D882 Standard Test Method for Tensile Properties of Thin Plastic Sheeting.
ASTM D1003 Standard Test Method for Haze and Luminous Transmittance of Transparent Plastics.
ASTM D1044 Standard Test Method for Resistance of Transparent Plastics to Surface Abrasion.
ASTM D1204 Standard Test Method for Linear Dimensional Changes of Non-rigid Thermoplastic
Sheeting or Film at Elevated Temperature.
ASTM D1593 Standard Specification for Non-rigid Vinyl Chloride Plastic Film and Sheeting.
ASTM D2103 Standard Specification for Polyethylene Film and Sheeting.
ASTM D2126 Standard Test Method for Response of Rigid Cellular Plastics to Thermal and Humid Aging.
ASTM D2842 Standard Test Method for Water Absorption of Rigid Cellular Plastics.
ASTM D2843 Standard Test Method for Density of Smoke from the Burning or Decomposition of
Plastics.
ASTM D3294 Standard Specification for PTFE Resin Molded Sheet and Molded Basic Shapes.
ASTM D3678 Standard Specification for Rigid Poly(Vinyl Chloride) (PVC) Interior-Profile Extrusions.
ASTM D3679 Standard Specification for Rigid Poly(Vinyl Chloride) (PVC) Siding.
ASTM D3841 Standard Specification for Glass-Fiber-Reinforced Polyester Plastic Panels.
ASTM D4802 Standard Specification for Poly(Methyl Methacrylate) Acrylic Plastic Sheet.
ASTM E84 Standard Test Method for Surface Burning Characteristics of Building Materials.
ASTM E119 Standard Test Methods for Fire Tests of Building Construction and Materials.
BNBC 2015 FINAL DRAFT
2.16.3 Ballies and Wood Poles
Ballies of Sal/Gazari, Sundari and Garjan are used in building construction. These shall be free from rots, knots
and sap, and straight and uniform in size. These should conform to the following Standards:
BDS 809:1973 Specification for wood poles for overhead power and telecommunication lines.
ASTM D25 Standard Specification for Round Timber Piles.
IS 3337
IS 1900 Specification for Ballies for general purposes.
IS 6711
Method of testing wood poles.
Code of practice for maintenance of wood poles for overhead power and
telecommunications lines.
2.16.4 Bamboos
The following standards shall be applicable for bamboos used for structural and nonstructural purposes:
IS 1902 Code of Practice for Preservation of Bamboo and Cane for Non-structural Purposes;
IS 6874 Method of Tests for Round Bamboos.
IS 8242 Methods of Tests for Split Bamboo.
IS 8295 Specification for Bamboo Chicks, Part I Fine.
IS 9096 Code of Practice for Preservation of Bamboos for Structural Purposes.
Bangladesh National Building Code 2015 5-51
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2.16.5 Fillers, Stoppers and Putties
These shall conform to the following standards:
IS 110 Specification for ready mixed paint, brushing, grey filler, for enamels, for use over
primers.
IS 345 Specification for wood filler, transparent, liquid.
IS 419 Specification for putty for use on window frames.
IS 421 Specification for jointing paste, for bedding moldings on coaching stock.
IS 423 Specification for plastic wood, for joiners' filler.
IS 424 Specification for plastic asphalt.
IS 3709 Specification for mastic cement for bedding of metal windows.
IS 7164 Specification for Stopper.
2.16.6 Wire Ropes and Wire Products
These materials shall conform to the following standards:BNBC 2015 FINAL DRAFT
ASTM A116 Standard Specification for Zinc-Coated (Galvanized) Steel Woven Wire Fence Fabric.
ASTM A121 Standard Specification for Metallic-Coated Carbon Steel Barbed Wire.
ASTM A368 Standard Specification for Stainless Steel Wire Strand.
ASTM A392 Standard Specification for Zinc-Coated Steel Chain-Link Fence Fabric.
ASTM A475 Standard Specification for Zinc-Coated Steel Wire Strand.
ASTM A492 Standard Specification for Stainless Steel Rope Wire.
ASTM A510 Standard Specification for General Requirements for Wire Rods and Coarse Round Wire,
Carbon Steel.
ASTM A586 Standard Specification for Zinc-Coated Parallel and Helical Steel Wire Structural Strand.
ASTM A603 Standard Specification for Zinc-Coated Steel Structural Wire Rope.
ASTM A817 Standard Specification for Metallic-Coated Steel Wire for Chain-Link Fence Fabric. and
Marcelled Tension Wire.
ASTM A824 Standard Specification for Metallic-Coated Steel Marcelled Tension Wire for Use With
Chain Link Fence.
ASTM F1183 Standard Specification for Aluminum Alloy Chain Link Fence Fabric.
IS 2365 Specification for Steel Wire Suspension Ropes for Lifts, Elevators and Hoists.
2.16.7 Waterproofing and Damp-proofing Materials
Waterproofing and damp-proofing materials shall conform to the following standards:
ASTM D41 Standard Specification for Asphalt Primer Used in Roofing, Damp proofing, and
ASTM D43 Waterproofing.
ASTM D146
ASTM D173 Standard Specification for Coal Tar Primer Used in Roofing, Damp proofing, and
Waterproofing.
Standard Test Methods for Sampling and Testing Bitumen-Saturated Felts and Woven
Fabrics for Roofing and Waterproofing.
Standard Specification for Bitumen-Saturated Cotton Fabrics Used in Roofing and
Waterproofing.
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ASTM D6380 Standard Specification for Asphalt Roll Roofing (Organic Felt).
ASTM
D226/D226M Standard Specification for Asphalt-Saturated Organic Felt Used in Roofing and
ASTM D227 Waterproofing.
ASTM D449 Standard Specification for Coal-Tar-Saturated Organic Felt Used in Roofing and
ASTM D450 Waterproofing.
ASTM D1327 Standard Specification for Asphalt Used in Damp proofing and Waterproofing.
ASTM D1668 Standard Specification for Coal-Tar Pitch Used in Roofing, Damp proofing, and
Waterproofing.
ASTM D2178
ASTM D2626 Standard Specification for Bitumen-Saturated Woven Burlap Fabrics Used in Roofing and
Waterproofing.
ASTM D3468
Standard Specification for Glass Fabrics (Woven and Treated) for Roofing and
Waterproofing.
Standard Specification for Asphalt Glass Felt Used in Roofing and Waterproofing.
Standard Specification for Asphalt-Saturated and Coated Organic Felt Base Sheet Used in
Roofing..
Standard Specification for Liquid-Applied Neoprene and Chloro-sulfonated Polyethylene
Used in Roofing and Waterproofing.
BNBC 2015 FINAL DRAFT
2.16.8 Glazed Tiles and Tile-setting Mortars
Glazed tiles shall conform to the following standards:
BDS 1301:1990 Specification for glazed earthenware wall tiles.
ASTM C126
Standard Specification for Ceramic Glazed Structural Clay Facing Tile, Facing Brick, and
ANSI A137.1 Solid Masonry Units.
BS 6431
Specification for Ceramic Tile.
Ceramic floor and wall tiles (Part 1 to 23).
2.16.8.1 Mortars for Ceramic Wall and Floor Tile
(a) Portland Cement Mortars: Portland cement mortars for installing ceramic wall and floor tile shall comply
with ANSI A108.1 and be of the compositions indicated in Table 5.2.1.
(b) Dry-set Portland Cement Mortars: Premixed prepared Portland cement mortars, which require only the
addition of water and which are used in the installation of ceramic tile, shall comply with ANSI A 118.1. The
shear bond strength for tile set in such mortar shall be as required in accordance with that standard. Tile set
in dry-set Portland cement mortar shall be installed in accordance with ANSI A 108.5.
(c) Electrically Conductive Dry-Set Mortars: Premixed prepared Portland cement mortars, which require only
the addition of water and which comply with ANSI A118.2, shall be used in the installation of electrically
conductive ceramic tile. Tile set in electrically conductive dry-set mortar shall be installed in accordance
with ANSI A 108.7.
(d) Latex-modified Portland Cement Mortars: Latex-modified Portland cement thin set mortars in which Lalex is
added to dry-set mortar as a replacement for all or part of the gauging water which are used for the
installation of ceramic tile shall comply with ANSI A 118.4. Tile set in latex-modified Portland cement mortar
shall be installed in accordance with ANSI A 108.5.
(e) Epoxy Mortar: Chemical-resistant epoxy for setting and grouting ceramic tile shall comply with ANSI A
118.3-2009. Tile set and grouted with epoxy shall be installed in accordance with ANSI A 108.6.
Bangladesh National Building Code 2015 5-53
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(f) Furan Mortar and Grout: Chemical resistant furan mortar and grout which are used to install ceramic tile
shall comply with ANSI A 118.5. Tile set and grouted with furan shall be installed in accordance with ANSI A
108.8.
(g) Modified Epoxy-Emulsion Mortar and Grout: Modified epoxy-emulsion mortar and grout which are used to
install ceramic tile shall comply with ANSI A 118.8. Tile set and grouted with modified epoxy-emulsion
mortar and grout shall be installed in accordance with ANSI A 108.9.
(h) Organic Adhesives: Water-resistant organic adhesives used for the installation of ceramic tile shall comply
with ANSI A 136.1. The shear bond strength after water immersion shall not be less than 0.25 kN/mm2 for
Type I adhesive, and not less than 0.13 kN/mm2 for Type II adhesive when tested in accordance with ANSI A
136.1. Tile set in organic adhesive shall be installed in accordance with ANSI A 108.4.
(i) Portland Cement Grouts: Portland cement grouts used for the installation of ceramic tile shall comply with
ANSI A 118.6. Portland cement grouts for tile work shall be installed in accordance with ANSI A 108.10.
2.16.8.2 Applicable Standards
A list of applicable Standards for tiles, mortars and adhesives is given below:
BNBC 2015 FINAL DRAFT
BDS 1301 : 1990 Specification for Glazed Earthenware Wall Tiles.
ASTM C126
Standard Specification for Ceramic Glazed Structural Clay Facing Tile, Facing Brick,
ANSI A108.1 and Solid Masonry Units.
ANSI A108.4
Specification for the Installation of Ceramic Tile with Portland Cement Mortar.
ANSI A108.5 Installation of Ceramic Tile with Organic Adhesives or Water Cleanable Tile Setting
Epoxy Adhesive.
ANSI A108.6
Installation of Ceramic Tile with Dry-Set Portland Cement Mortar or Latex-Portland
ANSI A108.7 Cement Mortar.
ANSI A108.8 Installation of Ceramic Tile with Chemical Resistant, Water Cleanable Tile Setting and
ANSI A108.9 Grouting Epoxy.
ANSI A108.10
ANSI A118.1 Specification for Electrically Conductive Ceramic Tile Installed with Conductive Dry-
ANSI A118.2 Set Portland Cement Mortar.
ANSI A118.3
Installation of Ceramic Tile with Chemical Resistant Furan Mortar and Grout.
ANSI A118.4
ANSI A118.5 Installation of Ceramic Tile with Modified Epoxy Emulsion Mortar/Grout.
ANSI A118.6
ANSI A118.8 Installation of Grout in Tile work.
ANSI A136.1 Specification for Dry-Set Portland Cement Mortar.
ANSI A137.1
BS 6431 Specifications for Conductive Dry-set Portland Cement Mortar.
BS 6431 Part 1
Specifications for Chemical Resistant Water Cleanable Tile Setting and Grouting
Epoxy and Water Cleanable Tile Setting Epoxy Adhesive.
Specifications Furan Latex - Portland Cement Mortar.
Specifications for Chemical Resistant Furan.
Specifications for Ceramic Tile Grouts.
Specifications for Modified Epoxy Emulsion Mortar/Grout.
Organic Adhesives for Installation of Ceramic Tile.
Specifications for Ceramic Tile.
Floor and wall tiles.
Specification for classification and making, including definitions and characteristics.
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BS 6431 Part 2 Specification for struded ceramic tiles with low water absorption (E< 3%) Group A1.
BS 6431 Part 3
BS 6431 Part 3 Sec 3.1 Extruded ceramic tiles with a water absorption of 3% < 6%. Group A 11a.
BS 6431 Part 3 Sec 3.2
BS 6431 Part 4 Specification for general products.
BS 6431 Part 4
BS 6431 Part 4 Sec 4.2 Specification for products Terre Cuite, Cotto, Baldosion Catalan.
BS 6431 Part 5
Extruded Ceramic Tiles with a Water Absorption of 6% <E< 10%. Group A11b.
BS 6431 Part 6
Specification for General Products.
BS 6431 Part 7
Specification for Specific Products (Terre Cuite, Cotto, Baldosion Catalan).
BS 6431 Part 8
Specification for extruded ceramic tiles with a water absorption of E>10%, Group
A111.
Specification for dust-pre-stressed ceramic tiles with a low-water absorption (E<3%)
Group B1.
Specification for dust-pre-stressed ceramic tiles with a water absorption of 3% <E
≤ 6%. Group B11a;
Specification for dust-pre-stressed ceramic tiles with water absorption of 6% < E
≤10%. Group B11b;
BNBC 2015 FINAL DRAFT
BS 6431 Part 9 Specification for dust-pre-stressed ceramic tiles with a water absorption of E >10%.
Group B111.
BS 6431 Part 10 Method for determination of dimensions and surface quality.
BS 6431 Part 11 Method for determination of water absorption.
BS 6431 Part 12 Method for determination of modulus of.
BS 6431 Part 13 Method for determination of scratch hardness of surface according to Mhos.
BS 6431 Part 14 Method for determination of resistance to abrasion of unglazed tiles.
BS 6431 Part 15 Method for determination of linear thermal expansion.
BS 6431 Part 16 Method for determination of resistance to thermal shock.
BS 6431 Part 17 Method for determination of crazing resistance-glazed tiles.
BS 6431 Part 18 Method for determination of chemical resistance-unglazed tiles.
BS 6431 Part 19 Method for determination of chemical resistance-unglazed tiles.
BS 6431 Part 20 Method for determination of resistance to surface abrasion-glazed tiles.
BS 6431 Part 23 Specification for sampling and basis for acceptance.
2.16.9 Refractories
Refractories shall conform to the following Standards:
BDS 1493: 1994 Glossary of terms used in refractory.
BDS 1494: 1994 Dimension of refractory bricks.
BDS 1495: 1994 High aluminum refractory bricks.
ISO 528 Refractory products-determination of pyrometric cone equivalent (refractoriness).
ISO 1109 Refractory products-classification of dense shaped refractory products.
ISO 1146 Pyrometric reference cones for laboratory use-specification.
ISO 1893 Refractory products-determination of refractoriness-under-load (differential with
rising temperature).
Bangladesh National Building Code 2015 5-55
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ISO 1927 BNBC 2015 FINAL DRAFTPrepared unshaped refractory materials (dense and insulating) classification.
ISO 2245
ISO 2477 Shaped insulating refractory products-classification.
ISO 2478 Shaped insulating refractory products-determination of permanent change in
dimensions on heating.
ISO 3187
ISO 5013 Dense shaped refractory products-determination of permanent change in
ISO 5014 dimensions on heating.
ISO 5016
Refractory products-determination of creep in compression.
ISO 5017
Refractory products-determination of modulus of rupture at elevated temperatures.
ISO 5018
ISO 5019 - 1 Refractory products-determination of modulus of rupture at ambient temperature.
ISO 5019 - 2
ISO 5019 - 3 Shaped insulating refractory products-determination of bulk density and true
porosity.
ISO 5419 - 4
ISO 5015 - 6 Dense shaped refractory products-determination of bulk density, apparent porosity
ISO 5022 and true porosity.
ISO 5417
ISO 8656 Refractory materials-determination of true density.
ISO 8840 Refractory bricks-dimensions-Part 1: Rectangular bricks.
ISO 8890 Refractory bricks-dimensions-Part 2: Arch bricks;
ISO 8894 - 1
Refractory bricks-dimensions-Part 3: Rectangular checker bricks for regenerative
ISO 8894 - 2 furnace.
ISO 8895 Refractory bricks-dimensions-Part 4: Dome bricks for electric arc furnace roofs.
ISO 9205
ISO 10080 Refractory bricks-dimensions-Part 6: Basic bricks for oxygen steel making converters.
ISO 10081
Shaped refractory products-sampling and acceptance testing.
Refractory bricks for use in rotary kilns-dimensions.
Refractory products-sampling of raw materials and unshaped products- Part 1:
Sampling scheme.
Refractory materials-determination of bulk density of granular materials (grain
density).
Dense shaped refractory products-determination of resistance to sulfuric acid.
Refractory materials-determination of thermal conductivity- Part 1: Hot-wire
method (cross-array).
Refractory materials-determination of thermal conductivity- Part 2: Hot-wire
method (parallel).
Shaped Insulating refractory products-determination of cold crushing strength.
Refractory bricks for use in rotary kilns-hot-face identification marking.
Refractory products-classification of dense, shaped acid-resisting products.
Basic refractory products-classification- Part I: Products containing less than 7%
residual carbon.
2.16.10 Thermal Insulating Materials
Thermal insulation may be in the following physical forms:
·Loose fill dry granules or nodules poured or below in place;
·Flexible or semi rigid blankets and bolts of wool like material;
·Rigid boards and blocks;
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·Membrane reflective insulation;
·Spray applied mineral fibre or insulating concrete;
·Poured in plain-insulating concrete;
·Foamed in place-polyurethane;
·Gypsum plaster.
Thermal insulating materials shall conform to the Standards listed below:
ASTM C167 Standard Test Methods for Thickness and Density of Blanket or Batt Thermal Insulations.
ASTM C177
Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission
ASTM C195 Properties by Means of the Guarded-Hot-Plate Apparatus.
ASTM C196
ASTM C208 Standard Specification for Mineral Fiber Thermal Insulating Cement.
ASTM C209
ASTM C1363 Standard Specification for Expanded or Exfoliated Vermiculite Thermal Insulating Cement
ASTM C240 Standard Specification for Cellulosic Fiber Insulating Board.
ASTM C335
ASTM C411 Standard Test Methods for Cellulosic Fiber Insulating Board.
ASTM C449 Standard Test Method for Thermal Performance of Building Materials and Envelope
Assemblies by Means of a Hot Box Apparatus.
ASTM C516
ASTM C518 Standard Test Methods of Testing Cellular Glass Insulation Block.
Standard Test Method for Steady-State Heat Transfer Properties of Pipe Insulation.
Standard Test Method for Hot-Surface Performance of High-Temperature Thermal
Insulation.
Standard Specification for Mineral Fiber Hydraulic-Setting Thermal Insulating and Finishing
Cement.
Standard Specification for Vermiculite Loose Fill Thermal Insulation.
Standard Test Method for Steady-State Thermal Transmission Properties by Means of the
Heat Flow Meter Apparatus.
BNBC 2015 FINAL DRAFT
ASTM C520 Standard Test Methods for Density of Granular Loose Fill Insulations.
ASTM C533
ASTM Standard Specification for Calcium Silicate Block and Pipe Thermal Insulation.
C534/C534M
ASTM C547 Standard Specification for Preformed Flexible Elastomeric Cellular Thermal Insulation in
ASTM C549 Sheet and Tubular Form.
ASTM C552
ASTM C553 Standard Specification for Mineral Fiber Pipe Insulation.
ASTM C578 Standard Specification for Perlite Loose Fill Insulation.
ASTM C591
Standard Specification for Cellular Glass Thermal Insulation.
ASTM C592
Standard Specification for Mineral Fiber Blanket Thermal Insulation for Commercial and
ASTM C610 Industrial Applications.
ASTM C612
ASTM C665 Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation.
Standard Specification for Un-faced Preformed Rigid Cellular Polyisocyanurate Thermal
Insulation.
Standard Specification for Mineral Fiber Blanket Insulation and Blanket-Type Pipe Insulation
(Metal-Mesh Covered) (Industrial Type).
Standard Specification for Molded Expanded Perlite Block and Pipe Thermal Insulation.
Standard Specification for Mineral Fiber Block and Board Thermal Insulation.
Standard Specification for Mineral-Fiber Blanket Thermal Insulation for Light Frame
Construction and Manufactured Housing.
Bangladesh National Building Code 2015 5-57
Part 5
Building Materials
ASTM C726 Standard Specification for Mineral Fiber Roof Insulation Board.
ASTM C728 Standard Specification for Perlite Thermal Insulation Board.
ASTM C739 Standard Specification for Cellulosic Fiber Loose-Fill Thermal Insulation.
ASTM C764 Standard Specification for Mineral Fiber Loose-Fill Thermal Insulation.
ASTM C916 Standard Specification for Adhesives for Duct Thermal Insulation.
ASTM C991 Standard Specification for Flexible Fibrous Glass Insulation for Metal Buildings.
ASTM C1014 Standard Specification for Spray-Applied Mineral Fiber Thermal and Sound Absorbing
Insulation.
ASTM C1029 Standard Specification for Spray-Applied Rigid Cellular Polyurethane Thermal Insulation.
ASTM C1071 Standard Specification for Fibrous Glass Duct Lining Insulation (Thermal and Sound
Absorbing Material).
2.16.11 Screw Threads and Rivets
These shall conform to the following standards:
BNBC 2015 FINAL DRAFT
IS 554 Dimensions for pipe threads where pressure tight joints are required on the threads.
IS 1929 Specification for hot forged steel rivets for hot closing (12 to 36 mm diameter).
IS 2155 Specification for cold-forged solid steel rivets for hot closing (6 to 16 mm diameter).
IS 2643 Dimensions for pipe threads for fastening purposes.
Part I - Basic profile and dimensions.
IS 2907 Part II - Tolerances.
IS 2998 Part III - Limits of sizes.
IS 10102 Specification for non-ferrous rivets (1.6 mm to 10 mm).
Specification for cold forged steel rivets for cold closing (1 to 16 mm diameter).
Technical supply conditions for rivets.
2.16.12 Sealants
Sealants shall conform to the following Standards:
ASTM C509 Standard Specification for Elastomeric Cellular Preformed Gasket and Sealing Material.
ASTM C542 Standard Specification for Lock-Strip Gaskets.
ASTM C564 Standard Specification for Rubber Gaskets for Cast Iron Soil Pipe and Fittings.
ASTM C716 Standard Specification for Installing Lock-Strip Gaskets and Infill Glazing Materials.
ASTM C719 Standard Test Method for Adhesion and Cohesion of Elastomeric Joint Sealants Under Cyclic
Movement (Hockman Cycle).
ASTM C1193 Standard Guide for Use of Joint Sealants.
ASTM C794 Standard Test Method for Adhesion-in-Peel of Elastomeric Joint Sealants.
ASTM C834 Standard Specification for Latex Sealants.
ASTM C864 Standard Specification for Dense Elastomeric Compression Seal Gaskets, Setting Blocks, and
Spacers.
ASTM C919 Standard Practice for Use of Sealants in Acoustical Applications.
ASTM C920 Standard Specification for Elastomeric Joint Sealants.
5-58 Vol. 1
Building Materials Chapter 2
ASTM C1193 Standard Guide for Use of Joint Sealants.
ASTM D2628
Standard Specification for Preformed Polychloroprene Elastomeric Joint Seals for Concrete
ASTM D6690 Pavements.
ASTM D3406 Standard Specification for Joint and Crack Sealants, Hot Applied, for Concrete and Asphalt
Pavements.
ASTM D3667
ASTM D3771 Standard Specification for Joint Sealant, Hot-Applied, Elastomeric-Type, for Portland
ASTM D3832 Cement Concrete Pavements.
ISO 3934
Standard Specification for Rubber Seals Used in Flat-Plate Solar Collectors.
ISO 4633
Standard Specification for Rubber Seals Used in Concentrating Solar Collectors.
ISO 4635
Standard Specification for Rubber Seals Contacting Liquids in Solar Energy Systems.
ISO 5892
Rubber building gaskets-materials in preformed solid vulcanizates used for sealing glazing
ISO 6447 and panels-specification.
ISO 9331
Rubber seals-joint rings for water supply, drainage and sewerage pipelines-specifications for
materials
Rubber, vulcanized-preformed compression seals for use between concrete motorway
paving sections-specifications for material.
Rubber Building Gaskets-Materials for Preformed Solid Vulcanized Structural Gaskets-
Specification;
Rubber seals-joint rings used for gas supply pipes and fittings- specification for material.
Rubber seals joint rings for hot water supply pipelines up to 110o C specifications for the
material.
BNBC 2015 FINAL DRAFT
2.16.13 Joints and Jointing Products
Joints and jointing products shall conform to the following Standards:
ISO 2444 Joints in buildings-vocabulary.
ISO 3867
ISO 3869 Agglomerated cork-material of expansion joints for construction and building test-methods.
ISO 3934 Agglomerated cork-filler material of expansion joints for construction and buildings -
characteristics, sampling and packing.
ISO 4633
Rubber building gaskets-materials in preformed solid vulcanizates used for sealing glazing
ISO 4635 and panels-specification.
ISO 5892 Rubber seals-joint rings for water supply, drainage and sewerage pipelines-specification for
materials.
ISO 6447
ISO 6589 Rubber, vulcanized-preformed compression seals for use between concrete motor way
ISO 7389 paving sections-specification for material.
ISO 7390
ISO 7727 Rubber building gaskets-materials for preformed solid vulcanized structural gaskets-
specification.
ISO 8339
Rubber seals-joint rings used for gas supply pipes and fittings-specification for material.
Joints in building-laboratory method of test for air permeability of joints.
Building construction-jointing products-determination of elastic recovery.
Building construction-jointing products-determination of resistance to flow.
Joints in building-principles for jointing of building components-accommodation of
dimensional deviations during construction.
Building construction-jointing products-sealants-determination of tensile properties.
Bangladesh National Building Code 2015 5-59
Part 5
Building Materials
ISO 8340 Building construction-jointing products-sealants-determination of tensile properties at
ISO 8394 maintained extension.
ISO 9046
ISO 9047 Building construction-jointing products-determination of extrudability of one-component
ISO 9631 sealants.
ISO 10563
ISO 10590 Building construction-sealants-determination of adhesion/ cohesion properties at constant
ISO 10591 temperature.
Building construction-sealants-determination of adhesion/ cohesion properties at variable
temperatures.
Rubber seals-joint rings for hot water supply pipelines up to 110oC specifications for the
material.
Building construction-sealants for joints-determination of change in mass and volume.
Building construction-sealants-determination of adhesion/cohesion properties at
maintained extension after immersion in water.
Building construction-sealants-determination of adhesion/cohesion properties after
immersion in water.
BNBC 2015 FINAL DRAFT
2.16.14 Glass and Glazing
The applicable Standards for glass and glazing are listed below:
ASTM C1036 Standard Specification for Flat Glass.
ASTM C1048
Standard Specification for Heat-Treated Flat Glass-Kind HS, Kind FT Coated and Uncoated
ANSI Z 97.1 Glass.
CPSC 16 CFR Safety Performance Specifications and Methods of Tests for Transport Safety Glazing
Materials Used in Building.
Safety Standard for Architectural Glazing Materials. Part 1201A.
2.17 CGI SHEET ROOFING AND WALLING
Galvanized corrugated steel sheets conforming to BDS 868, Galvanized Corrugated Sheet Roof and Wall
Coverings, may be used over structural framing for construction of roofs and walls. Requirements for various
roofing materials including CGI sheet have been specified in Sec 2.13 above.
5-60 Vol. 1
INDEX
ABSORPTION BNBC 2015 FINAL DRAFT8-76 ANCHORAGE BLISTER 6-439
ABSORPTION REFRIGERATING ANCHORAGE ZONE 6-439
SYSTEM 8-76 ANGULAR DISTORTION 6-144
ACCESSIBILITY 3-1 ANNUNCIATOR 4-1
ACCESSIBILITY ROUTE 3-1 APPARATUS 8-2
ACCESSIBLE 3-1, 8-195 APPLIANCE 8-2, 8-275
ACCESSORY 8-2 APPLIANCE VALVE 8-275
ACCESSORY USE 1-3 APPLICABLE BUILDING CODE 6-493
ACTION 6-439 APPLICANT 2-1
ACTIVE FIRE PROTECTION 6-493 1-3, 6-25,
ACTUAL DIMENSIONS 6-349 APPROVED 8-275
ADAPTABLE 3-1 2-1
ADJUSTED BRACE STRENGTH 6-493 APPROVED PLAN 10-1
ADSORPTION 8-76 APPROVED PLASTIC 1-3
ADVERTISING SIGN 10-1, 10-16 ARCHITECT 3-1
AIR CHANGE 8-76 AREA PLANNING AUTHORITY 6-703
AIR TERMINALS 8-76 ARMATURE
AIR, OUTSIDE 8-76 ASD (ALLOWABLE STRENGTH 6-493
AIR, RECIRCULATED 8-76 DESIGN)
AIR, RETURN 8-76 ASD LOAD COMBINATION 6-493
AIR-CONDITIONING 8-76 ASSEMBLY 3-1
AIRGAP 8-195 AT JACKING 6-439
AIR-HANDLING UNIT 8-77 AT LOADING 6-439
ALARM CONTROL UNIT 4-1 AT TRANSFER 6-440
ALARM INITIATING DEVICE 4-1 ATRIUM 3-1
ALARM SIGNAL 4-1 AUGUR PILE 6-144
ALARM SIGNAL DEVICE 4-1 AUTHORITY 1-3, 7-1
ALARM SYSTEM 4-1 AUTHORITY HAVING
ALARM ZONE 4-1 JURISDICTION 6-493, 7-31
ALIVE 8-2 AUTHORITY HAVING
ALLEY 10-1 JURISDICTION (AHJ) 6-493, 8-275
ALLOWABLE BEARING CAPACITY 6-144 AUTHORIZED OFFICER
ALLOWABLE LOAD 6-144 AUTOGENEOUS SHRINKAGE 1-3, 2-1, 7-1
ALLOWABLE STRENGTH 6-493 AUTOMATIC FIRE DETECTING 6-440
ALLOWABLE STRESS 6-493 AND ALARM SYSTEM
ALLOWABLE STRESS DESIGN AUTOMATIC HIGH VELOCITY 4-1
METHOD (ASD) 6-25 WATER SPRAY SYSTEM
ALTERATION 1-3, 2-1 AUTOMATIC RESCUE DEVICE 4-1
AMPLIFICATION FACTOR 6-493 AUTOMATIC SPRINKLER 8-157
AMPLIFIED SEISMIC LOAD 6-493 SYSTEM
ANALYSIS 6-439 AVAILABLE HEAD 4-1
AVAILABLE STRENGTH 8-195
ANCHORAGE 6-439 AVAILABLE STRESS 6-493
AVERAGE RIB WIDTH 6-493
6-493
Index i
Index
BACK SIPHONAGE BNBC 2015 FINAL DRAFT8-195 BOILER 8-77
BACKFLOW 8-195 BOND 6-349
BACKFLOW CONNECTION OR BOND BEAM 6-349
CONDITION 8-195 BONDED MEMBER 6-440
BACKFLOW PREVENTER 8-195 BONDED POST-TENSIONING 6-440
BALANCED NOISE CRITERIA BONDED TENDON 6-440
(NCB) CURVES 8-129 BORED PILE 6-144
BALCONY 3-1 BOTTOM CAR CLEARANCE 8-157
BALCONY SIGN 10-2 BOTTOM CAR RUNBY 8-157
BALL COCK 8-195 BOTTOM COUNTER WEIGHT
BALUSTER 3-1, 8-157 RUNBY 8-158
BALUSTRADE 3-1, 8-157 BOULDER 6-144
BAMBOO 6-223 BOUNDARY MEMBERS 6-395
BAMBOO BORE/GHOON HOLE 6-225 BRACED FRAME 6-1,6-25,6-494
BAMBOO CLUMP 6-223 8-196,8-225
BAMBOO CULM 6-223 BRANCH 8-263
BAMBOO MAT BOARD 6-223 8-2
BARRIER 3-2 BRANCH CIRCUIT, APPLIANCE
BASE 6-25 BRANCH CIRCUIT, GENERAL 8-2
BASE OF STRUCTURE 6-395 PURPOSE 8-2
BASE SHEAR 6-1, 6-25 BRANCH CIRCUIT, INDIVIDUAL 8-196
BASEMENT 1-3, 3-2 BRANCH CONNECTOR 6-494
BASEMENT STOREY 8-157 BRANCH FACE 8-225
BASIC WIND SPEED 6-1, 6-25 BRANCH INTERVAL 8-275
BATTEN PLATE 6-494 BRANCH LINE 6-494
BATTER PILE 6-144 BRANCH MEMBER 8-225
BDB 8-2 BRANCH VENT 6-223
BEAM 6-223, 6-494 BREAKING STRENGTH 8-77
BEARING (LOCAL COMPRESSIVE BRINE 6-494
YIELDING) 6-494 BUCKLING 6-494
BEARING CAPACITY BUCKLING STRENGTH
BEARING SURFACE 6-144 BUCKLING-RESTRAINED 6-494
BEARING WALL SYSTEM 6-144 BRACED FRAME (BRBF)
BEARING WALL SYSTEM 6-25 BUCKLING-RESTRAINING 6-494
BEARING-TYPE CONNECTION 6-1 SYSTEM
BED BLOCK 6-494 BUFFER 8-158
BED JOINT 6-349 BUFFER, OIL 8-158
BEDDING FACTOR 6-349 BUFFER, SPRING 8-158
BEDPAN WASHER AND 8-225, 8-263 BUILDER 2-1
STERILIZER BUILDING 1-3, 4-1
BEL 8-195 BUILDING SUPPLY 8-196
BIOLOGICAL DEGRADATION 8-129 BUILDING DRAIN 8-225, 8-263
BLAST AREA 6-440 BUILDING ENVELOPE 6-25
BLASTING 7-1 BUILDING FABRIC 7-71
BLOCK SHEAR RUPTURE 7-1 BUILDING FRAME SYSTEM 6-26, 6-1
BLOWER 6-494 BUILDING LINE 1-4, 3-2
8-77 BUILDING MAINTENANCE 7-71
ii Vol. 1
Index
BUILDING OFFICIAL BNBC 2015 FINAL DRAFT1-4, 2-1 CHARACTERISTIC LOAD 6-224
BUILDING OR OTHER CHARACTERISTIC STRENGTH 6-224, 6-440
STRUCTURE, FLEXIBLE 6-26 CHARPY V-NOTCH IMPACT TEST 6-494
BUILDING OR OTHER CHECK 6-662
STRUCTURE, REGULAR SHAPED 6-26 CHEMICAL ADMIXTURES 6-440
BUILDING OR OTHER CHIMNEY 8-77
STRUCTURES, RIGID 6-26 CHORD MEMBER 6-494
BUILDING SEWER 8-225, 8-263 CIRCUIT 8-2
BUILDING STORM DRAIN 8-263 CIRCUIT BREAKER 8-3
BUILDING, ENCLOSED 6-25 CIRCUIT VENT 8-225
BUILDING, EXISTING 4-2 CLADDING 6-494
BUILDING, LOW-RISE 6-25 CLAY 6-144
BUILDING, OPEN 6-26 CLAY MINERAL 6-144
BUILDING, PARTIALLY CLAY SOIL 6-144
ENCLOSED 6-26 CLEAVABILITY 6-224
BUILDING, SIMPLE DIAPHRAGM 6-26 CLOSELY SPACED ANCHORAGES 6-440
BUILT-UP MEMBER, CROSS- CLOSURE 6-440
SECTION, SECTION, SHAPE 6-494 COBBLE 6-144
BUILT-UP-LAMINATED BEAM COIL 8-77
BUNCHED 6-661 COLD-FORMED STEEL
BUNDLE-COLUMN 8-2 STRUCTURAL MEMBER 6-494
BURNER/COOKERS 6-224 COLLAPSE
BURSTING FORCE 8-275 COLLAPSIBLE SOIL 6-225
BUTTRESS 6-440 COLLAR JOINT 6-144
CABLE 6-349 COLLECTOR 6-349
CAISSON 8-2 COLLECTOR ELEMENTS 6-2
CALL INDICATOR 6-144 6-395
CAMBER 8-158 COLUMN 6-224, 6-261,
CAPACITY CURVE 6-494 6-349, 6-494
CAR BODY WORK 6-26 COLUMN BASE 6-495
CAR DOOR ELECTRIC CONTACT 8-158 COMB PLATE 8-158
CAR FRAME 8-158 COMBINATION SIGN 10-2
CAR PLATFORM 8-158 COMBINED SYSTEM 6-495
CAR SPEED 8-158 COMBUSTIBLE MATERIAL 4-2
CARBON DIOXIDE 8-158 COMMITTEE 1-4
EXTINGUISHING SYSTEM COMMON RAFTER 6-224
CARRIAGEWAY 4-2 COMMON SPACE CONDITION 3-2
CARTRIDGE 3-2 COMPACT SECTION 6-495
CASING 7-1 COMPARTMENTATION 6-495
CAST IN-SITU PILE 6-494 COMPLETE-JOINT-
CAST-IN-PLACE CONCRETE 6-144 PENETRATION GROOVE WELD 6-495
CAVITY WALL 6-440 (CJP)
CEILING HEIGHT 6-349 COMPONENTS AND CLADDING 6-26
CELING ROSE 3-2 COMPOSITE 6-495
CELL 8-2 COMPOSITE CONSTRUCTION 6-440
CELLULOSE 6-223, 6-349 COMPRESSION CONTROLLED
CENTRE INTERNODE 6-223 SECTIONS 6-261, 6-440
6-224
Bangladesh National Building Code 2015 iii
Index
COMPRESSION CONTROLLED BNBC 2015 FINAL DRAFT6-261, 6-440 CONTROL, SOLID-STATE D.C. 8-159
STRAIN LIMIT 6-662 VARIABLE VOLTAGE
COMPRESSION WOOD 8-276 CONTROL, TWO-SPEED 8-158
ALTERNATING CURRENT
CONCEALED GAS PIPING 6-1 CONTROL,VARIABLE VOLTAGE 8-158
CONCENTRIC BRACED FRAME 6-261 MOTOR (GENERATOR FIELD 6-495
(CBF) 6-440 CONTROL) 1-4
CONCRETE 6-495 CONVECTIVE HEAT TRANSFER 8-77
CONCRETE COVER 6-495 CONVERSION 6-495
CONCRETE CRUSHING 6-261 COOLING TOWER 8-3
CONCRETE HAUNCH 6-261 COPE 8-159
CONCRETE, LIGHTWEIGHT CORD, FLEXIBLE CABLE 6-495
CONCRETE, NORMALWEIGHT 6-261 COUNTER WEIGHT 6-261
CONCRETE, SPECIFIED 6-495 COVER PLATE 1-4
COMPRESSIVE STRENGTH OF 8-77 COVER, SPECIFIED CONCRETE 6-440
CONCRETE-ENCASED BEAM 8-77 COVERED AREA 6-440
CONDENSER (REFRIGERANT) 7-71 CREEP 6-440
CONDENSING UNIT 6-440 CREEP COEFFICIENT 6-26
CONFINED SPACE 6-440 CREEP IN CONCRETE 8-196
CONFINEMENT 6-261, 6-495 CRITICAL DAMPING 6-225
CONFINEMENT ANCHORAGE 6-144 CRITICAL LEVEL 6-495
CONNECTION 1-4, 2-1 CROOKEDNESS 6-349
CONSOLIDATION SETTLEMENT 7-2, 7-31 CROSS CONNECTION 6-395
CONSTRUCT, TO 7-2 CROSS JOINT 6-223
CROSS TIE 8-196
CONSTRUCTION EQUIPMENT 8-276 CROSS WALL
8-196 CROSS-CONNECTION 6-349
CONSULTANT 6-495 CROSS-SECTIONAL AREA OF 6-349
CONSUMER’S/CUSTOMER’S 6-261 MASONRY UNIT 6-224
CONNECTION 6-495 CURTAIN WALL 6-441
CONTAMINATION 7-2 CURVATURE 8-3
CONTINUITY PLATES 8-77 CURVATURE FRICTION 8-129
CONTRACTION JOINT 3-2 CUTOUT 6-26
CONTRACTOR 6-26 CYCLE 8-276, 8-196
CONTRACTORS 8-158 CYCLONE PRONE REGIONS 6-441
CONTROL CYLINDER 8-77
CONTROL AREA 8-158 DAMAGE CONTROL 6-26
CONTROL POINT DAMPER 3-95
CONTROL SYSTEM 8-159 DAMPING 8-3
CONTROL, ALTERNATING 8-158 DAYLIGHT ZONE 8-129
CURRENT VARIABLE VOLTAGE 8-158 DB 6-662
(ACW) DBA 6-2
CONTROL, ALTERNATING 8-158 DEAD KNOT 6-662
CURRENT VARIABLE VOLTAGE DEAD LOAD 8-129
VARIABLE FREQUENCY DECAYED KNOT
(ACVVVF) DECIBEL (DB)
CONTROL, ELECTRONIC DEVICES
CONTROL, RHEOSTATIC
CONTROL, SINGLE-SPEED
ALTERNATING CURRENT
iv Vol. 1
Index
DECOMPRESSION BNBC 2015 FINAL DRAFT6-441 DIFFERENTIAL SETTEMENT 6-145
DEEP FOUNDATION 6-145 DIPLOMA ARCHITECT 1-4
DEFLECTOR SHEAVE 8-159 DIPLOMA ENGINEER 1-4
DEFORMABILITY 6-441 DIRECT ANALYSIS METHOD 6-496
DEGREE OF DETERIORATION 6-441 DIRECT BOND INTERACTION 6-496
DEHUMIDIFICATION 8-77 DIRECT SOUND 8-129
DELAMINATION 6-224 DIRECTION SIGN 10-1
DEMAND CRITICAL WELD 6-495 DIRECTIONAL SIGN 10-16
DEMAND FACTOR 8-3 DISCOLORATION 6-225, 6-663
DESIGN ACCELERATION DISPERSIVE SOIL 6-145
RESPONSE SPECTRUM 6-26 DISPLACEMENT PILE 6-145
DESIGN BEARING CAPACITY 6-145 DISPLAY SURFACE 10-1
DESIGN DISPLACEMENT 6-261 DISTORTION SETTLEMENT 6-145
DESIGN EARTHQUAKE 6-27, 6-495 DISTORTIONAL FAILURE 6-496
DESIGN FORCE 6-27 DISTORTIONAL STIFFNESS 6-496
DESIGN LIFE 6-441 DISTRIBUTION PIPE 8-196
DESIGN LOAD 6-145, 6-495 DIVERSITY FACTOR 8-276
DESIGN LOAD COMBINATION 6-261 DOOR CLOSE 8-159
DESIGN PRESSURE 6-27 DOOR OPERATOR 8-159
DESIGN STORY DRIFT 6-495 DOOR, CENTRE OPENING
DESIGN STORY DRIFT RATIO 6-261 SLIDING 8-159
DESIGN STRENGTH 6-495, 6-27 DOOR, HINGED 8-159
DESIGN STRESS 6-495 DOOR, MID BAR COLLAPSIBLE 8-159
DESIGN STRESS RANGE 6-495 DOOR, MULTI-PANEL 8-159
DESIGN WALL THICKNESS 6-496 DOOR, SINGLE SLIDE 8-159
DESIGN-BASIS FIRE 6-495 DOOR, SWING 8-159
DETACHED OCCUPANCY 3-2 DOOR, TWO SPEED 8-159
DETERIORATION INDEX 6-441 DOOR, VERTICAL BI-PARTING 8-159
DETERIORATION PREDICTION 6-441 DOOR, VERTICAL LIFTING 8-159
DETERMINING ENTRANCE DOUBLE CURVATURE 6-496
LEVEL 8-159 DOUBLE-CONCENTRATED
DETONATOR 7-2 FORCES 6-496
DEVELOPED LENGTH 8-196 DOUBLER
DEVELOPMENT 1-4, 2-1 DOWNDRAG 6-496
DEVELOPMENT AUTHORITY 3-2 6-145
DEVELOPMENT LENGTH 6-261 DRAIN 1-4,8-226,8-
DEVELOPMENT LENGTH OF A 263
STANDARD HOOK 6-395 DRAINAGE 1-4
DEVIATION SADDLE 6-441 DRAINAGE SYSTEM 8-226, 8-263
DEW POINT TEMPERATURE 8-77 DRIFT 6-496
DIAGONAL BRACING 6-496 DRILLED PIER 6-145
DIAGONAL STIFFENER 6-496 DRILLED SHAFT 6-145
DIAMETER OF KNOT 6-662 DRINKING FOUNTAIN 8-226, 8-264
6-2, 6-27, 6- DRIP 8-276
DIAPHRAGM 496 DRIVEN PILE 6-145
6-496 DRIVING MACHINERY 8-159
DIAPHRAGM PLATE DROP PANEL 6-262
Bangladesh National Building Code 2015 v
Index
DRY BULB TEMPERATURE BNBC 2015 FINAL DRAFT8-77 EFFECTIVE WIND AREA, A 6-27
DRY RISER 4-2 ELASTIC ANALYSIS 6-497
DRY-CHEMICAL EXTINGUISHING ELASTIC SETTLEMENT 6-145
SYSTEM 4-2 ELECTRIC SIGN 10-2
DRYING SHRINKAGE 6-441 ELECTRICAL AND MECHANICAL
6-2, 6-27, 6- INTERLOCK 8-159
DUAL SYSTEM 496 ELECTRO-MECHANICAL LOCK 8-159
8-3 ELEVATED TEMPERATURES 6-497
DUCT 8-77 ELEVATOR EVACUATION
DUCT SYSTEM 6-496 SYSTEM 4-2
DUCTILE LIMIT STATE 6-27 ELEVATOR LOBBY 4-2
DUCTILITY 8-159 EMBEDMENT LENGTH 6-262
DUMBWAITER 6-441 EMERGENCY LIGHTING 3-95
DURABILITY DESIGN 6-441 EMERGENCY STOP PUSH OR
DURABILITY GRADE 6-661 SWITCH 8-159
DURATION OF LOAD 6-441 EMPLOYER 7-2
DYNAMIC APPROACH 6-441 ENCASED COMPOSITE COLUMN 6-497
DYNAMIC RESPONSE FACTOR 6-441 ENCLOSED WELL 8-160
EARLY AGE STATE 8-3 END BEARING 6-145
EARTH END DISTANCE 6-224, 6-661
EARTH CONTINUITY 8-3 END PANEL 6-497
CONDUCTOR (ECC) 8-3 END RETURN 6-497
EARTH ELECTRODE 8-3 END SPLITTING 6-225
EARTH LEAD WIRE 6-27 ENERGY EFFICIENCY RATIO 8-77
EAVE HEIGHT ENGINEER 1-4
ECCENTRIC BRACED FRAME 6-27 ENGINEER OF RECORD 6-497
(EBF) ENGINEER-IN-CHARGE 8-3
ECCENTRIC BRACED FRAME 6-2 ENGINEERING GEOLOGIST 1-4
(EBF) ENTHALPY 8-77
ECCENTRICALLY BRACED FRAME 6-496 ENVIRONMENTAL ACTIONS 6-441
(EBF) EPICENTRE 6-27
ECHO 8-129 EQUILIBRIUM DENSITY 6-262
EDB 8-3 EQUIVALENT 8-276
EDGE DISTANCE 6-661 ERECT, TO 1-4
EFDB 8-3 ERECT, TO 2-1
EFFECTIVE DEPTH OF SECTION 6-262 ESCALATOR 8-160
EFFECTIVE LENGTH 6-496 ESCALATOR LANDING 8-160
EFFECTIVE LENGTH FACTOR 6-496 ESCALATOR LANDING ZONE 8-160
EFFECTIVE MODULUS OF THE ESCALATOR MACHINE 8-160
REINFORCEMENT 6-703 ESCARPMENT 6-27
EFFECTIVE NET AREA 6-496 ESSENTIAL FACILITIES 6-27
EFFECTIVE OPENING 8-196 EVAPORATIVE AIR COOLING 8-77
EFFECTIVE PERCEIVED NOISE EVAPORATOR (REFRIGERANT) 8-77
LEVEL IN DECIBEL (EPN DB) 8-129 EXCAVATION 6-145
EFFECTIVE PRESTRESS 6-441 EXEMPTED COLUMN 6-497
EFFECTIVE SECTION MODULUS 6-496 EXFILTRATION 8-77
EFFECTIVE STRESS 6-145
EFFECTIVE WIDTH 6-496
vi Vol. 1
Index
EXISTING WORK BNBC 2015 FINAL DRAFT8-226, 8-264 FITTING 8-196
EXPANSION ROLLER 6-497 FIXTURE 8-196
EXPANSIVE SOIL 6-145 FIXTURE BRANCH 8-196
EXPECTED TENSILE STRENGTH 6-497 FIXTURE SUPPLY 8-196
EXPECTED YIELD STRENGTH 6-497 8-196, 8-226,
EXPECTED YIELD STRESS 6-497 FIXTURE UNIT 8-264
EXPLOSIVE 7-2 6-498
EXTERIOR STAIRWAY 4-2 FLARE BEVEL GROOVE WELD 6-498
EXTREME TENSION STEEL 6-262 FLARE V-GROOVE WELD 6-498
EYEBAR 6-497 FLASHOVER 6-498
FACED WALL 6-349 FLAT WIDTH 6-224
FACTOR OF SAFETY 6-145 FLATTEN BAMBOO 6-27
FACTORED LOAD 6-27, 6-497 FLEXIBLE DIAPHRAGM 6-27
FAN 8-77 FLEXIBLE ELEMENT OR SYSTEM 6-498
FAN, TUBEAXIAL 8-77 FLEXURAL BUCKLING
FAR (FLOOR AREA RATIO) 3-2 FLEXURAL-TORSIONAL 6-498
FATIGUE 6-497 BUCKLING
FATIGUE LOADS 6-441 FLOAT OPERATED VALVE 8-196
FAUCET 8-196 FLOOD 3-2
FAYING SURFACE 6-497 FLOOD LEVEL 3-2
FDB 8-3 FLOOD LEVEL RIM 8-196
FEED CISTERN 8-196 FLOOD PRONE AREA 3-2
FILL 6-145 FLOOR 8-160
FILLED COMPOSITE COLUMN 6-497 FLOOR AREA, GROSS 4-2
FILLER METAL 6-497 FLOOR AREA, NET 4-2
FILLET WELD 6-497 FLOOR HEIGHT 3-2
FILTER 8-77 FLOOR HOLE 7-2, 7-31
FIN SIGN 10-2 FLOOR LEVELING SWITCH 8-160
FINAL PRESTRESS 6-441 FLOOR OPENING 7-2, 7-31
FINAL TENSION 6-441 FLOOR SELECTOR 8-160
FINGER JOINT 6-661 FLOOR STOPPING SWITCH 8-160
FIRE 3-2, 6-497 FLUSH VALVE 8-196
FIRE BARRIER 4-2, 6-497 FLUSH TANK 8-196
FIRE COMPARTMENT 4-2 FLUSH VALVES 8-226, 8-264
FIRE DAMPER 4-2, 8-78 FLUSHING CISTERN 8-196
FIRE DOOR 4-2 FLUSHOMETER TANK 8-196
FIRE DOOR ASSEMBLY 4-2 FLUSHOMETER VALVE 8-197
FIRE ENDURANCE 6-497 FLUTTER ECHO 8-129
FIRE RESISTANCE 6-497 FOAM EXTINGUISHING SYSTEM 4-2
FIRE RESISTANCE RATING 4-2, 6-498 FOOTING 6-145
FIRE SEPARATION 4-2, 8-78 FORCE 6-498
FIRE SEPARATION DISTANCE 3-2 FORMATION LEVEL 1-4, 3-3
FIRE TOWER 4-2 FORMED SECTION 6-498
FIRST-ORDER ANALYSIS 6-498 FORMED STEEL DECK 6-498
FITTED BEARING STIFFENER 6-498 FORMWORK 6-441
FOUNDATION 6-145
FOUNDATION ENGINEER 6-145
Bangladesh National Building Code 2015 vii
Index
FREE ROOF BNBC 2015 FINAL DRAFT6-27 GRIP (OF BOLT) 6-498
FRENCH DRAIN 8-226, 8-264 GROOVE WELD 6-498
FREQUENCY 8-130 GROSS ALLOWABLE BEARING
FRONTAGE 3-2 PRESSURE 6-146
FUEL GAS 8-276 GROSS PRESSURE 6-146
FULL CULM 6-224 GROSS ULTIMATE BEARING
FULL FACILITIES 8-197 CAPACITY 6-146
FULLY RESTRAINED MOMENT GROUND SIGN 10-2
CONNECTION 6-498 GROUND WATER TABLE 6-146
FUNCTION GROUT 6-350, 6-442
FUNDAMENTAL OR ULTIMATE 6-441 GROUTED HOLLOW-UNIT
STRESS MASONRY 6-350
FUSE 6-224 GROUTED MULTI-WYTHE
FUSE SWITCH 8-3 MASONRY 6-350
GAGE 8-4 GUARD 3-3
GALLERY 6-498 GUARD RAILING 7-2, 7-31
GAP CONNECTION 3-3 GUIDE RAILS 8-160
GAS FITTER 6-498 GUIDE RAILS FIXING 8-160
GAS MANIFOLD 8-276 GUIDE RAILS SHOE 8-160
GASES 8-276 GUSSET PLATE 6-499
GEARED MACHINE 8-276 HANDLING CAPACITY 8-160
GEARLESS MACHINE 8-160 HANGERS 8-197
GENERAL COLLAPSE 8-160 HEAD JOINT 6-350
GENERAL ZONE 6-498 HEAD ROOM CLEARANCE 3-3
GEOMETRIC AXIS 6-441 HEAT FLUX 6-499
GEOTECHNICAL ENGINEER 6-498 HEAT RELEASE RATE 6-499
GEYSER 1-4, 6-145 HEIGHT OF BUILDING 1-5
GIRDER 8-197 HELISTOP 3-3
GIRDER FILLER 6-498 HEMI CELLULOSE 6-223
GIRT 6-498 HIGH RISE BUILDING 1-5, 3-3
GLAZING 6-498 HILL 6-27
GLAZING, IMPACT RESISTANT 6-27 HOISTING BEAM 8-160
GLOBAL WARMING POTENTIAL 6-27 HOISTS 7-2
(GWP) HOLLOW UNIT 6-350
GLUED-LAMINATED BEAM 8-78 HOOP 6-395
GOODS LIFT 6-661 HORIZONTAL BRACING SYSTEM 6-2, 6-28
GOUGE 8-160 HORIZONTAL BRANCH 8-226, 8-264
GOVERNMENT 6-498 HORIZONTAL EXIT 4-2
GOVERNOR 1-4 8-197, 8-226
8-160 HORIZONTAL PIPE 8-264
GRADE 1-4, 8-197, 6-499
8-226, 8-264 HORIZONTAL SHEAR 8-160
GRAVEL 6-146 HOSPITAL LIFT 8-197
GRAVITY AXIS 6-498 HOT WATER TANK 7-71
GRAVITY FRAME 6-498 HOUSEKEEPING 6-499
GRAVITY LOAD 6-498 HSS 8-78
GREY WATER 3-95 HUMIDITY
viii Vol. 1
Index
HUMIDITY, RELATIVE BNBC 2015 FINAL DRAFT8-78 JOIST 6-224
HYDRAULIC LIFT 8-160 K-AREA 6-499
HYDRONIC 8-78 K-BRACED FRAME 6-499
IDENTIFICATION SIGN 10-1, 10-17 K-CONNECTION 6-499
ILLUMINATED SIGN 10-2 KITCHEN SINK 8-226
IMHOFF TANK 8-226 KNOT 6-663
IMMEDIATE SETTLEMENT 6-146 KNOT HOLE 6-663
IMPACT ISOLATION CLASS (IIC) 8-130 KSI 6-499
IMPACT RESISTANT COVERING 6-28 LABELED 8-276
IMPORTANCE FACTOR, LACING 6-499
EARTHQUAKE LOAD 6-28 LAGGING 8-197
IMPORTANCE FACTOR, WIND LAMINATED VENEER LUMBER 6-661
LOAD 6-28 LANDING 8-161
INDIVIDUAL VENT 8-226 LANDING CALL PUSH BUTTON
INDIVIDUAL WATER SUPPLY 8-197 (LIFT) 8-161
INDOOR AIR QUALITY (IAQ) 8-78 LANDING DOOR (LIFT) 8-161
INELASTIC ANALYSIS 6-499 LANDING PLATE 8-161
INFILTRATION 8-78 LANDING ZONE 8-161
INFORMATIONAL SIGN 10-2, 10-17 LAP JOINT 6-499
INITIAL PRESTRESS 6-442 LATERAL BRACING 6-499
INITIAL TENSION 6-442 LATERAL BRACING MEMBER 6-500
INNER DIAMETER 6-224 LATERAL FORCE RESISTING
INORGANIC SOIL 6-146 SYSTEM 6-395
IN-PLANE INSTABILITY 6-499 LATERAL LOAD 6-500
INSIDE LOCATION 6-224, 6-661 LATERAL LOAD RESISTING
INSTABILITY 6-499 SYSTEM 6-500
INSULATION 8-4 LATERAL SUPPORT
INSULATION, THERMAL 8-78 LATERALLY LOADED PILE 6-350
INTEGRATED PART LOAD VALUE LATERAL-TORSIONAL BUCKLING 6-146
(IPLV) 8-78 LEADER 6-500
INTENSITY 8-130 LEANING COLUMN 8-226, 8-264
INTENSITY OF EARTHQUAKE 6-28 LENGTH EFFECTS 6-500
INTERCEPTOR 8-226, 8-264 LENGTH OF INTERNODE 6-500
INTERIOR STAIRWAY 4-3 LEVELING DEVICE, LIFT CAR 6-224
INTERMEDIATE MOMENT 6-2, 6-28, 6- LEVELING DEVICE, ONE WAY 8-161
FRAME (IMF) 499 AUTOMATIC
INTERSTORY DRIFT ANGLE 6-499 LEVELING DEVICE, TWO WAY 8-161
INTERVAL 8-161 AUTOMATIC NON-
INVERT 8-226, 8-264 MAINTAINING 8-161
INVERTED-V-BRACED FRAME 6-499 LEVELING DEVICE, TWO-WAY
ISOLATION JOINT 6-262 AUTOMATIC MAINTAINING 8-161
JACKING FORCE 6-442 LEVELING ZONE 8-161
JAMB 6-350 LICENSED DESIGN
6-224, 6-262, PROFESSIONAL 6-262
JOINT 6-499 LIFT 8-161
6-499 LIFT CAR 8-161
JOINT ECCENTRICITY LIFT LANDING 8-161
Bangladesh National Building Code 2015 ix
Index
LIFT MACHINE BNBC 2015 FINAL DRAFT8-161 LOCATION 6-662
LIFT PIT 8-161 LOFT 3-3
LIFT SYSTEM 8-161 LONGITUDINAL DIRECTION 6-703
LIFT WELL 8-161 LONG-TERM PERFORMANCE
LIFT WELL ENCLOSURE 8-161 INDEX 6-442
LIFTING BEAM 8-161 LOOP VENT 8-226
LIGHTING FITTING 8-4 LOOSE GRAIN 6-663
LIGHTING POWER DENSITY LOOSE KNOT 6-663
(LPD) 3-96 LOUDNESS 8-130
LIGHTING SHAFT 3-3 LOWEST ANTICIPATED SERVICE
LIGNIN 6-223 TEMPERATURE (LAST) 6-499
LIMB LRFD (LOAD AND RESISTANCE
6-350 FACTOR DESIGN) 6-499, 6-500
LIMIT STATE 6-28, 6-442 LRFD LOAD COMBINATION
6-500 LT / LV AND HT/ HV 6-499, 6-500
LIMITS OF DISPLACEMENT 6-442 LUMINAIRE 8-4
LINK 6-500 MACHINE ROOM 8-4
LINK INTERMEDIATE WEB MACHINERY SPACE 8-161
STIFFENERS 6-500 MAGAZINE 8-161
LINK ROTATION ANGLE MAGNITUDE OF EARTHQUAKE 7-2
LINK SHEAR DESIGN STRENGTH 6-500 6-28
LIQUEFACTION 6-500 MAIN 8-197, 8-226,
LIQUEFIED PETROLEUM GAS 6-28 8-264
(LPG) MAIN MEMBER 6-500
8-276 MAIN SEWER 8-226, 8-264
LIQUID WASTE 8-197, 8-226 MAIN VENT 8-226
8-264 MAIN WIND-FORCE RESISTING
LISTED 8-276 SYSTEM (MWFRS) 6-28
LIVE 8-4 MAINTENANCE 6-442, 7-71
LIVE KNOT 6-663 MAINTENANCE MANAGEMENT 7-71
LIVE LOAD 6-2 MANDATORY OPEN SPACE 3-3
LOAD 6-500 MANHOLE 8-226, 8-264
LOAD BEARING WALL 6-350 MANHOLE CHAMBER 8-227, 8-264
LOAD EFFECT 6-500 MARQUEE 10-2
LOAD EFFECTS 6-28 MARQUEE SIGN 10-2
6-28, 6-500 MASONRY 6-350
LOAD FACTOR 8-226, 8-264, MASONRY UNIT 6-350
6-262 MAT 6-224
LOAD, FACTORED 6-661 MAT FOUNDATION 6-146
LOADED EDGE DISTANCE
LOADED END OR COMPRESSION 6-224 MATCHET 6-224
END DISTANCE 6-28
LOADS 6-500 MATERIALS HANDLING HOISTS 7-32
LOCAL BENDING 6-500
LOCAL BUCKLING 6-500 MAXIMUM CONSIDERED 6-28
LOCAL CRIPPLING 8-226 EARTHQUAKE (MCE) 8-4
LOCAL VENT STACK 6-500 MDB 6-28
LOCAL YIELDING 6-442 MEAN ROOF HEIGHT, H
LOCAL ZONE MEASURED FLEXURAL 6-500
RESISTANCE
x Vol. 1
Index
MECHANICAL FORCES BNBC 2015 FINAL DRAFT6-442 NON SEPARATED SPACE 3-3
MECHANICAL JOINT 8-197 CONDITION 8-227
MECHANICAL REFRIGERATION NON SERVICE LATRINE 10-2
EQUIPMENT 8-79 NONCOMBUSTIBLE MATERIAL 6-501
MECHANISM 6-501 NONCOMPACT SECTION 6-501
METER 8-276 NONDESTRUCTIVE TESTING
MEZZANINE 8-162 NON-STANDARD PART LOAD 8-79
MEZZANINE FLOOR 3-3 VALUE (NPLV) 6-442
MILL SCALE 6-501 NORMAL CONCRETE 6-501
MILLED SURFACE 6-501 NOTCH TOUGHNESS 6-501
MIXED OCCUPANCY 3-3 NOTIONAL LOAD 6-29
MODAL MASS 6-28 NUMBER OF STOREYS (N) 1-5
MODAL PARTICIPATION OCCUPANCY OR USE GROUP 1-5
FACTOR 6-28 OCCUPANCY, MAJOR 1-5
MODAL SHAPE COEFFICIENT 6-29 OCCUPIER 8-197, 8-227,
MODEL 6-442 8-264
MODULUS OF ELASTICITY 6-262 OFFSET 3-3
MOMENT CONNECTION 6-501 8-162
MOMENT FRAME 6-501 OPEN SPACE 3-3
MOMENT RESISTING FRAME 6-2, 6-29 OPEN TYPE WELL 3-3, 6-29
MONITORING 6-442 OPENING, VERTICAL 8-163
MORTISE AND TENON 6-224 OPENINGS 8-162
MOULD 6-663 OPERATING DEVICE 8-162
MOVING WALK 8-162 OPERATION 8-162
NEGATIVE SKIN FRICTION 6-146 OPERATION, AUTOMATIC
NET AREA 6-501 OPERATION, CAR SWITCH 8-163
NET PRESSURE 6-146 OPERATION, DOUBLE BUTTON
NET SECTION 6-224 (CONTINUOUS PRESSURE) 8-162
NET ULTIMATE BEARING OPERATION, GROUP
CAPACITY 6-146 AUTOMATIC 8-162
NEWEL 8-162 OPERATION, NON-SELECTIVE
NODAL BRACE 6-501 COLLECTIVE AUTOMATIC 8-162
NODE 6-224 OPERATION, SELECTIVE 8-162
NOISE 8-130 COLLECTIVE AUTOMATIC
NOISE EXPOSURE FORECAST OPERATION, SIGNAL 8-162
(NEF) 8-130 OPERATION, SINGLE
NOISE MAP 8-130 AUTOMATIC 6-501
NOISE REDUCTION (NR) 8-130 ORDINARY CONCENTRICALLY
NOMINAL DIMENSION 6-501 BRACED FRAME (OCBF) 6-2, 6-29, 6-
NOMINAL DIMENSIONS 6-350 ORDINARY MOMENT FRAME 501
NOMINAL LOAD 6-501 (OMF) 6-146
NOMINAL LOADS 6-29 ORGANIC SOIL 6-224
NOMINAL RIB HEIGHT 6-501 OUTER DIAMETER 8-276
NOMINAL STRENGTH 6-29, 6-501 OUTLET 6-501
NOMINAL STRENGTH OF OUT-OF-PLANE BUCKLING 6-225, 6-662
MATERIAL 6-442 OUTSIDE LOCATION
OVERALL HEAT TRANSFER 8-79
COEFFICIENT (U) 6-442
OVERALL PERFORMANCE INDEX
Bangladesh National Building Code 2015 xi
Index
OVERCONSOLIDATION RATIO BNBC 2015 FINAL DRAFT6-146 PILE CAP 6-146
(OCR) 8-4 PILE HEAD 6-146
OVER-CURRENT 8-163 PILE RIG 7-2, 7-32
OVERHEAD BEAMS (LIFT) 8-163 PILE SHOE 6-146
OVERHEAD PULLEY 6-501 PILE TOE 6-146
OVERLAP CONNECTION 6-501 PILOT 8-276
OVERSTRENGTH FACTOR 7-71 PIPE 6-502, 8-276
OWNER 1-5, 2-1 PIPE SYSTEM 8-227
OWNER OF A BUILDING PIPING SYSTEM 8-276
OZONE DEPLETION POTENTIAL 8-79 PITCH 6-502
(ODP) 6-502 PITCH POCKET 6-663
P -dEFFECT 6-503 PLAIN CONCRETE 6-262
P-∆ EFFECT 8-79 PLANNER 1-5
PACKAGED AIR CONDITIONER 8-4 PLASTIC ANALYSIS 6-502
PANEL BOARD 6-350 PLASTIC HINGE 6-502
PANEL WALL 6-501 PLASTIC HINGE REGION 6-262
PANEL ZONE 6-442 PLASTIC MOMENT 6-502
PARTIAL PERFORMANCE INDEX PLASTIC SHRINKAGE 6-442
PARTIAL SAFETY FACTOR FOR 6-442 PLASTIC STRESS DISTRIBUTION
MATERIAL METHOD 6-502
PARTIAL-JOINT-PENETRATION 6-501 PLASTIFICATION
GROOVE WELD (PJP) PLATE GIRDER 6-502
PARTIALLY RESTRAINED 6-501 PLATFORM 6-502
MOMENT CONNECTION PLENUM 7-2, 7-32
PARTITION WALL 6-350 PLINTH 8-79
PARTY WALL 4-3 PLINTH AREA 3-3
PASSENGER LIFT 8-163 PLINTH LEVEL 1-5, 3-3
PASSIVE FIRE PROTECTION 6-501 PLOT 1-5, 3-3
P-DELTA EFFECT 6-29 PLSTIC STATE 1-5, 3-4
PEAT SOIL 6-146 PLUG 6-442
PEDESTAL 6-262 PLUG WELD 8-4
PERCENT ELONGATION 6-502 PLUMBING 6-502
PERCENTAGE SYLLABLE PLUMBING APPLIANCES 8-197, 8-227
ARTICULATION (PSA) 8-130 PLUMBING APPURTENANCE 8-197
PERFORMANCE 6-442 PLUMBING ENGINEER 8-197
PERFORMANCE INDEX 6-442 PLUMBING FIXTURE 1-5
PERFORMANCE-BASED DESIGN 6-502 PLUMBING FIXTURES 8-197
PERIOD OF BUILDING 6-29 PLUMBING SYSTEM 8-227
PERMANENT ACTIONS 6-442 POINT (IN WIRING) 8-197, 8-227
PERMANENT LOAD 6-502 PONDING 8-4
PERMANENT STRUCTURE 6-662 PORE WATER PRESSURE 6-502
PERMISSIBLE STRESS 6-662 POSITION AND/OR DIRECTION 6-146
PERMIT 1-5 INDICATOR
PERMIT 2-1 POSITIVE VENTILATION 8-163
PIER 6-350 POST-BUCKLING STRENGTH 8-79
PILASTER 6-350 POST-TENSIONING 6-502
PILE 6-146 6-442
xii Vol. 1
Index
POTABLE WATER BNBC 2015 FINAL DRAFT8-197 RATED SPEED (LIFT) 8-163
POWER OPERATED DOOR 8-163 RATED SPEED (MOVING WALK) 8-163
PRECAST CONCRETE 6-262 RATIONAL ANALYSIS 6-29
PREQUALIFIED CONNECTION 6-502 RATIONAL ENGINEERING
PRESCRIPTIVE DESIGN 6-502 ANALYSIS 6-503
PRESSURE REGULATOR 8-276 RECEPTOR
PRESSURE TEST 8-277 RECOGNIZED LITERATURE 8-198
PRESTRESSED CONCRETE 6-443 REDUCED BEAM SECTION 6-29
PRESUMPTIVE BEARING REENTRANT 6-503
CAPACITY 6-147 REFRIGERANT 6-503
PRETENSIONED JOINT 6-502 REGULARLY OCCUPIED SPACE 8-79
PRETENSIONING 6-443 REGULATORY SIGN 3-95
PRIMARY FRAMING SYSTEM 6-2 REHEATING 10-2, 10-17
PRIMER 7-2 REINFORCED CONCRETE 8-79
PRINCIPAL RAFTER 6-225 REINFORCED MASONRY 6-262
PRISM 6-350 RELATIVE BRACE 6-350
PRIVATE/PRIVATE USE 8-197 RELATIVE ROTATION 6-503
PROFESSIONALS 7-2 RELIABILITY 6-147
PROJECTING SIGN 10-2 RELIABLE LITERATURE 6-443
PROPERLY DEVELOPED 6-502 RELIABLE REFERENCE 1-5
PROTECTED ZONE 6-502 RELIEF VENT 1-5
PROTOTYPE 6-502 REMAINING SERVICE LIFE 8-227
PRYING ACTION 6-502 REMEDIAL ACTION 6-443
PSYCHROMETRIC CHART 8-79 REPAIR 6-443
PSYCHROMETRY 8-79 REPLACEMENT PILE 6-443
PUBLIC PASSAGE 10-2 REQUIRED STRENGTH 6-147
PUBLIC PROPERTY 10-2 RESIDUAL HEAD 6-503
PUBLIC SEWER 8-227, 8-264 RESISTANCE FACTOR 8-198
PUBLIC WAY 1-5, 4-3 RESISTANCE FACTOR, F 6-29
PUNCHING LOAD 6-502 RESPONSE REDUCTION FACTOR 6-503
PURGE 8-277 RESTORABILTY 6-29
PURLIN 6-502 RESTRAINED CONSTRUCTION 6-443
PURLINS 6-225 RESTRICTED FACILITIES 6-503
QUALIFIED AGENCY 8-277 RETIRING CAM 8-198
QUALITY ASSURANCE 6-503 RETURN AIR GRILLE 8-163
QUALITY ASSURANCE PLAN 6-503 REVERBERATION 8-79
QUALITY CONTROL 6-503 REVERBERATION TIME (RT) 8-130
QUICK CLOSING VALVE 8-198 REVERSE CURVATURE 8-130
RAFT 6-147 RIDGE 6-503
RAKER PILE 6-147 RIM 6-29
RAMP 3-4, 4-3 8-198
RAMP GRADIENT 3-4 RISER 8-198, 8-227
RAMP, ACCESSIBILITY 3-4 8-264
RAMPED DRIVEWAY 3-4 ROAD 1-5
RATED SPEED (ESCALATOR) 8-163 ROAD LEVEL 3-4
RATED LOAD 8-163 ROAD LINE 1-5
ROBUSTNESS 6-443
Bangladesh National Building Code 2015 xiii
Index
ROCK BNBC 2015 FINAL DRAFT6-147 SEPARATION WALL 3-4
ROOF 3-4 SEPTIC TANK 8-227
ROOF BATTENS 6-225 SERVICE 8-4
ROOF REFUGE AREA 4-3 SERVICE LATRINE 8-227
ROOF SIGN 10-2 SERVICE LIFE 6-443
ROOF SKELETON 6-225 SERVICE LIFT 8-163
ROOM AIR-CONDITIONER 8-80 SERVICE LOAD 6-147, 6-504
ROOM HEIGHT 1-5 SERVICE LOAD COMBINATION 6-504
ROOT OF JOINT 6-503 SERVICE METER ASSEMBLY 8-277
ROPING MULTIPLE 8-163 SERVICE PIPE 8-198
ROT 6-663 SERVICE REGULATOR 8-277
ROTATION 6-147 SERVICE ROAD 1-6
ROTATION CAPACITY 6-503 SERVICE SHUTOFF VALVE 8-277
ROUGHING-IN 8-198 SERVICEABILITY 6-443
RUPTURE STRENGTH 6-503 SERVICEABILITY LIMIT STATE 6-504
SAFE BEARING CAPACITY 6-147 SETBACK LINE 1-6
SAFE BEARING PRESSURE 6-147 SETTLEMENT 6-147
SAFETY 6-443 SETTLEMENT OF CONCRETE 6-443
SAFETY FACTOR, 6-503 SEWAGE 8-227, 8-264
SAFETY GEAR 8-163 SEWER 8-227, 8-265
SAFETY SHUTOFF DEVICE 8-277 SHADE FACTOR 8-80
SALVAGE 7-2 SHADING COEFFICIENT (SC) 3-96
SANCTIONED PLAN 1-5 SHAFT RESISTANCE 6-147
SAND 6-147 SHAKE 6-663
SANITARY SEWER 8-264 SHALL 8-277
SAP STAIN 6-663 SHALLOW FOUNDATION 6-147
SAPWOOD 6-663 SHEAR BUCKLING 6-504
SCAFFOLD 7-2, 7-32 SHEAR CONNECTOR 6-504
SCREW PILE 6-147 SHEAR CONNECTOR STRENGTH 6-504
SDB 8-4 SHEAR RUPTURE 6-504
SECONDARY CONSOLDATION 6-2, 6-29
SETTLEMENT 6-147 SHEAR WALL 6-350, 6-504
SECOND-ORDER ANALYSIS 6-503 6-504
SECOND-ORDER EFFECT 6-503 SHEAR YIELDING 6-504
SEEPAGE PIT 8-227, 8-264 SHEAR YIELDING (PUNCHING) 8-163
SEISMIC DESIGN CATEGORY 6-29, 6-503 SHEAVE 6-504
SEISMIC HOOK 6-262 SHEET STEEL 6-395
SEISMIC LOAD RESISTING SHELL CONCRETE 6-504
SYSTEM (SLRS) 6-503 SHIM 7-2
SEISMIC RESPONSE SHOTFIRER 6-443
MODIFICATION COEFFICIENT 6-504 SHRINKAGE LOSS 6-504
SEISMIC USE GROUP SIDESWAY BUCKLING 6-504
SEISMIC-FORCE-RESISTING 6-504 SIDEWALL CRIPPLING 6-504
SYSTEM SIDEWALL CRUSHING 8-130
SEPARATE SPACE CONDITION 6-29 SIGNAL-TO-NOISE RATIO (SNR) 6-147
SEPARATED OCCUPANCY 3-4 SILT 6-504
3-4 SIMPLE CONNECTION
xiv Vol. 1
Index
SINGLE CURVATURE BNBC 2015 FINAL DRAFT6-504 SPECIAL PLATE SHEAR WALL 6-505
SINGLE-CONCENTRATED FORCE 6-504 (SPSW)
SITE 1-6, 3-4 SPECIAL STRUCTURAL SYSTEM 6-2
SITE CLASS 6-29 SPECIALIST 1-6
SITE-SPECIFIC DATA 6-30 SPECIFIC SURFACE OF
SKELETAL REINFORCEMENT 6-703 REINFORCEMENT 6-703
SLACK ROPE SWITCH 8-163 SPECIFIED DIMENSIONS 6-350
SLENDER BUILDINGS AND SPECIFIED MINIMUM TENSILE
STRUCTURES 6-2 STRENGTH 6-505
SLENDER-ELEMENT SECTION 6-504 SPECIFIED MINIMUM YIELD
SLENDERNESS RATIO 6-225 STRESS 6-505
SLIP 6-504 SPEECH INTELLIGIBILITY
SLIP JOINT 8-198 SPIRAL REINFORCEMENT 8-131
SLIP-CRITICAL CONNECTION 6-504 SPLICE 6-262
SLIVER 6-223 SPLIT 6-505
SLOPE OF GRAIN 6-663 SPLIT AIR CONDITIONER 6-663
SLOT WELD 6-504 SPLITS 8-80
SLUDGE 8-228, 8-265 SPLITTING TENSILE STRENGTH 6-225
SMOKE DETECTOR 4-3 SPRITZING 6-262
SMOKE DRAFT BARRIER 3-4 STABILITY 6-703
SNUG-TIGHTENED JOINT 6-505 STACK 6-505
SOAK PIT 8-228, 8-265 STACK BOND 8-228, 8-265
SOAK WELL 8-228, 8-265 STACK VENT 6-350
SOFT STOREY 6-2, 6-30 STACK VENTING 8-228
SOIL 6-147 STAGE 8-228
SOIL PARTICLE SIZE 6-147 STAGE, INTERIOR 3-4
SOIL PIPE 8-228, 8-265 STAGE, LEGITIMATE 3-4
SOIL VENT 8-228 STATIC YIELD STRENGTH 3-4
SOLAR HEAT GAIN COEFFICIENT STEEL CORE. AXIAL-FORCE- 6-505
(SHGC) 3-96 RESISTING ELEMENT OF BRACES
SOLDERED JOINT 8-198 IN BRBF 6-506
SOLID UNIT 6-350 STERILIZER VENT
SOUND FOCUS AND DEAD SPOT 8-131 STIFF AND FLEXIBLE STRUCURES 8-228
SOUND KNOT 6-663 STIFFENED ELEMENT 6-443
SOUND PRESSURE LEVEL (SPL) 8-131 STIFFENER 6-505
SOUND TRANSMISSION CLASS STIFFNESS 6-505
(STC) 8-131 STIRRUPS 6-505
SPACE FRAME 6-2, 6-30 STOP VALVE 6-263
SPACED COLUMN 6-662 STORAGE CISTERN 8-198
SPECIAL CONCENTRICALLY STORAGE DENSITY 8-198
BRACED FRAME (SCBF) 6-505 STORAGE TANK 3-4
SPECIAL TRUSS MOMENT 8-198
FRAME (STMF) 6-505 STOREY 6-2, 1-6, 6-30
SPECIAL CONCRETE 8-163
6-443 STOREY DRIFT 6-30
SPECIAL MOMENT FRAME 6-2, 6-30, STOREY SHEAR 6-2, 6-30
(SMF) 6-505 STOREY, FIRST 1-6
STOREYS FOR SPECIFIC USE 8-163
Bangladesh National Building Code 2015 xv
Index
STORM DRAIN BNBC 2015 FINAL DRAFT8-265 SURFACE CRACKING 6-225
STORM SEWER 8-265 SURGE PRONE AREA 3-5
STRAIN COMPATIBILITY SUSPENSION ROPES (LIFT) 8-163
METHOD 6-505 SWITCH 8-4
STREET SWITCHBOARD 8-4
STREET FLOOR LEVEL 1-6 SWITCHGEAR 8-4
STREET LEVEL 3-5 TALL STRUCTURE 3-5
STREET LINE 1-6 TAPER 6-225
STREET OR ROAD 1-6 TARGET DISPLACEMENT 6-30
STREET OR ROAD WIDTH 3-4 T-CONNECTION 6-506
STRENGTH 3-5 TEMPERATURE CRACKING 6-443
STRENGTH 6-30 TEMPERATURE, DRY BULB 8-80
STRENGTH DESIGN 6-2 TEMPERATURE, WET BULB 8-80
STRENGTH DESIGN METHOD 6-263 TEMPERED WATER 8-198
STRENGTH LIMIT STATE 6-30 TEMPORARY SIGN 10-2
STRENGTH, NOMINAL 6-505 TEMPORARY STRUCTURE 6-662
STRENGTH, REQUIRED 6-263 TENDON 6-443
STRENGTHENING 6-263 TENSILE RUPTURE 6-506
STRESS 6-443 TENSILE STRENGTH (OF
STRESS AT TRANSFER 6-505 MATERIAL) 6-506
STRESS CONCENTRATION 6-443 TENSILE STRENGTH (OF
STRONG AXIS 6-505 MEMBER) 6-506
STRUCTURAL ANALYSIS 6-505 TENSILE YIELDING
STRUCTURAL COMPONENT 6-505 TENSION AND SHEAR RUPTURE 6-506
STRUCTURAL CONCRETE 6-505 TENSION CONTROLLED SECTION 6-506
STRUCTURAL DIAPHRAGM 6-263 TENSION FIELD ACTION 6-263
STRUCTURAL DIAPHRAGMS 6-662 TERMINAL SLOW DOWN 6-506
STRUCTURAL ELEMENT 6-395 SWITCH
STRUCTURAL FRAME 6-662 TERMINAL STOPPING DEVICE 8-164
STRUCTURAL GRADES 3-5 FINAL
STRUCTURAL SANDWICH 6-662 TERMINAL STOPPING SWITCH 8-164
STRUCTURAL STEEL 6-662 NORMAL
STRUCTURAL SYSTEM 6-505 TERMITE 8-164
STRUCTURAL TIMBER 6-505 TERRACE 6-662
STRUCTURAL WALLS 6-662 TERRAIN 3-5
STRUT 6-395 TESTED CONNECTION 6-2
SUB CIRCUIT, FINAL CIRCUIT 6-396 THERMAL ENERGY STORAGE 6-506
SUBSIDIARY STOREY 8-2 THERMAL TRANSMITTANCE 8-80
SUBSOIL DRAIN 8-163 THERMALLY CUT 8-80
SULLAGE 8-228, 8-265 THREE-SECOND GUST SPEED 6-506
SUMP 8-228, 8-265 THRESHOLD LEVEL OF 6-2
SUPERVISOR, CONSTRUCTION 8-228, 8-265 PERFORMANCE
SUPPLY AIR 1-6 TIE 6-443
SUPPLY AIR DIFFUSERS/GRILLES 8-80 TIE ELEMENTS 6-263
8-80 TIE PLATE 6-396
SUPPORTS 8-198, 8-228, TIGHT KNOT 6-506
8-265 TILT 6-663
6-147
xvi Vol. 1
Index
TISSUE BNBC 2015 FINAL DRAFT6-223 V-BRACED FRAME 6-507
TOE BOARD 7-3, 7-32 VENEERED WALL 6-351
TOE OF FILLET 6-506 VENT 8-164, 8-277
TOP CAR CLEARANCE 8-164 VENT PIPE 8-228
TOP COUNTERWEIGHT VENT STACK 8-228
CLEARANCE 8-164 VENT SYSTEM 8-228
TORSIONAL BRACING 6-506 VENT, FIRE 4-3
TORSIONAL BUCKLING 6-506 VENTILATION 4-3
TORSIONAL YIELDING 6-506 VENTILATION 8-80
TOTAL HEADROOM 8-164 VENTILATION SHAFT, NATURAL 3-5
TOTAL SETTLEMENT 6-147 VERANDAH 3-5
TOWER 6-2 VERTICAL BRACING SYSTEM 6-507
TRANSFER 6-443 VERTICAL LOAD-CARRYING
TRANSFER LENGTH 6-443 FRAME 6-2, 6-30
TRANSMISSION LOSS 8-131 8-198, 8-228
TRANSVERSE DIRECTION 6-703 VERTICAL PIPE 8-265
TRANSVERSE REINFORCEMENT 6-506 4-3
TRANSVERSE STIFFENER 6-506 VESTIBULE
TRAP 8-228, 8-265 VISIBLE LIGHT TRANSMITTANCE 3-96
TRAP SEAL 8-228, 8-265 (VLT)
TRAVEL (LIFT) 8-164 VOLUME FRACTION OF 6-703
TRAVEL DISTANCE 4-3 REINFORCEMENT 3-5
TRAVEL PATH 4-3 WALKUP BUILDING 7-3, 7-32
TUBING 8-277, 6-506 WALL HOLE 6-351
TURN-OF-NUT METHOD 6-506 WALL JOINT 7-3, 7-32
ULL OPEN VALVE 8-197 WALL OPENING 10-2
ULTIMATE LIMIT STATE 6-443 WALL SIGN 6-225
ULTIMATE STRESS 6-662 WALL THICKNESS 6-351
UNBRACED LENGTH 6-506 WALL TIE 6-663
UNEVEN LOAD DISTRIBUTION 6-506 WANE 8-198
UNFRAMED END 6-506 WARMING PIPE 6-663
UNIVERSAL ACCESSIBILITY 3-5 WARP 8-198
UNLOADED END DISTANCE 6-225 WASHOUT VALVE 8-228, 8-265
UNPROTECTED 3-5 WASTE PIPE 8-80
UNRESTRAINED WATER CONDITIONING
CONSTRUCTION 6-506 WATER CONDITIONING OR 8-198
UNSAFE BUILDING TREATING DEVICE 8-198
UNSTIFFENED ELEMENT 1-6, 2-1 WATER HAMMER ARRESTER 8-198, 8-277
U-VALUE (THERMAL 6-507 WATER HEATER 8-199
TRANSMITTANCE) WATER LINE 8-199
VACUUM BREAKER 3-96 WATER MAIN 8-199
VALVE 8-198 WATER OUTLET 8-199
VARIABLE ACTION 8-277 WATER SUPPLY SYSTEM 8-131
VARIABLE LOAD 6-444 WAVELENGTH 6-507
VARIABLE REFRIGERANT FLOW 6-507 WEAK AXIS 6-2, 6-30
(VRF) SYSTEM WEAK STOREY 6-507
8-80 WEATHERING STEEL
Bangladesh National Building Code 2015 xvii
Index
WEB BUCKLING 6-507 WORKMEN/ LABOURERS 7-3
WEB COMPRESSION BUCKLING 6-507 WORM HOLES 6-663
WEB SIDESWAY BUCKLING 6-507 WRINKLED AND DEFORMED
WELD METAL 6-507 SURFACE 6-225
WELD ROOT 6-507 WYTHE 6-351
WELDED JOINTS OR SEAM 8-199 X-BRACED FRAME 6-507
WET LOCATION 6-225, 6-662 Y-BRACED FRAME 6-507
WET RISER STAND PIPE SYSTEM 4-3 Y-CONNECTION 6-507
WET-CHEMICAL YIELD MOMENT 6-507
EXTINGUISHING SYSTEM 4-3 YIELD POINT 6-507
WIND-BORNE DEBRIS REGIONS 6-30 YIELD STRENGTH 6-263, 6-507
WINDOW TO WALL RATIO OF YIELD STRESS 6-507
BUILDING (WWRB) 3-96 YIELDING 6-507
WOBBLE FRICTION 6-444 YIELDING (PLASTIC MOMENT) 6-507
WORKABILITY 6-444 YIELDING (YIELD MOMENT) 6-507
WORKING STRESS DESIGN YOKE VENT 8-228
METHOD (WSD) 6-30
BNBC 2015 FINAL DRAFT
xviii Vol. 1