Code for

Environmental Sustainability

Of Buildings

Project Type

Total New GFA Residential (m2)

Total New GFA Non-Residential (m2)

GM Score Residential Applicable

GM Score Non-Residential

Applicable

Mixed-Use Building

≥ 2000

≥ 2000

Yes

Yes

≥ 2000

< 2000

Yes

No

< 2000

≥ 2000

No

Yes

< 2000

< GFA for Residential

Yes

No

< GFA for Non-Residential

< 2000

No

Yes

Category

Point Allocations

(I) Energy Related Requirements

Maximum Cap of 50 points

Minimum 30 points

Part 1 : Energy Efficiency

RB 1-1 Building Envelope – RETV RB 1-2 Dwelling Unit Indoor Comfort

RB 1-3 Natural Ventilation in Common Areas RB 1-4 Lighting

RB 1-5 Ventilation in Carparks RB 1-6 Lifts

RB 1-7 Energy Efficient Features

15

16

2

15

8

2

7

Category Score for Part 1 – Energy Efficiency (Exclude Bonus Points)

65

Bonus

20 points

RB 1-8  Renewable Energy (Bonus Points)

20

(II)   Other Green Requirements

Maximum Cap of 50 points

Minimum 20 points

Part 2 : Water Efficiency

RB 2-1 Water Efficient Fittings RB 2-2 Water Usage

RB 2-3 Irrigation System

10

1

2

Category Score for Part 2 – Water Efficiency

13

Part 3 : Environmental Protection

RB 3-1 Sustainable Construction RB 3-2 Greenery

RB 3-3 Environmental Management Practice

RB 3-4 Public Transport Accessibility

12

6

9

2

Category Score for Part 3 – Environmental Protection

29

Part 4 : Indoor Environmental Quality

RB 4-1 Noise Level

RB 4-2 Indoor Air Pollutants RB 4-3 Waste Disposal

RB 4-4 Indoor Air Quality in Wet Areas

1

3

1

1

Category Score for Part 4 – Indoor Environmental Quality

6

Part 5 : Other Green Features

RB 5-1 Green Features & Innovations

7

Category Score for Part 5 – Other Green Features

7

Total Points Allocated : Total Point Allocated (Include BONUS points):

120

140

Green Mark Score (Max) :

100 + Bonus 20 points

Category

Point Allocations

(I) Energy Related Requirements

Maximum Cap of 50 points

Minimum 30 points

Part 1 : Energy Efficiency

NRB 1-1 Building Envelope – ETTV NRB 1-2 Air-Conditioning System

Section (A) Applicable to air-con areas

15

27

Sub-Total (A) - NRB 1-1 to 1-2

42

NRB 1-3 Building Envelope – Design/Thermal Parameters NRB 1-4 Natural Ventilation (exclude carparks)

Section (B) Applicable to non air-con areas

29

13

Sub-Total (B) - NRB 1-3 to 1-4

42

NRB 1-5 Artificial Lighting

NRB 1-6 Ventilation in Carparks

NRB 1-7 Ventilation in Common Areas NRB 1-8 Lifts and Escalators

NRB 1-9 Energy Efficient Practices & Features

Section (C) Generally applicable to all areas

12

5

5

3

12

Sub-Total (C) - NRB 1-5 to 1-9

37

Category Score for Part 1 – Energy Efficiency (Exclude Bonus Points) Prorate Subtotal (A) + Prorate Subtotal (B) + Subtotal (C)

79

Bonus

20 points

NRB 1-10 Renewable Energy (Bonus Points)

20

(III) Other Green Requirements

Maximum Cap of 50 points

Minimum 20 points

Part 2 : Water Efficiency

NRB 2-1 Water Efficient Fittings

NRB 2-2 Water Usage and Leak Detection NRB 2-3 Irrigation System

NRB 2-4 Water Consumption of Cooling Tower

8

2

2

2

Category Score for Part 2 – Water Efficiency

14

Part 3 : Environmental Protection

NRB 3-1 Sustainable Construction NRB 3-2 Greenery

NRB 3-3 Environmental Management Practice NRB 3-4 Public Transport Accessibility

NRB 3-5 Refrigerants

14

6

8

2

2

Category Score for Part 3 – Environmental Protection

32

Part 4 : Indoor Environmental Quality

NRB 4-1 Thermal Comfort NRB 4-2 Noise Level

NRB 4-3 Indoor Air Pollutants

NRB 4-4 High Frequency Ballasts

2

2

2

2

Category Score for Part 4 – Indoor Environmental Quality

8

Part 5 : Other Green Features

NRB 5-1 Green Features & Innovations

7

Category Score for Part 5 – Other Green Features

7

Total Points Allocated : Total Point Allocated (Include BONUS points):

140

160

Green Mark Score (Max) :

100 + Bonus 20 points

Part 1 - Energy Efficiency

Green Mark Points

RB 1-1 Building Envelope – RETV

Enhance the overall thermal performance of building envelope to minimise heat gain thus reducing the overall cooling load when required.

Baseline : Maximum Permissible RETV = 25 W/m2

3 points for every reduction of 1 W/m2  in RETV from the baseline

Points scored = 75 – [3 x (RETV)] where RETV ≤ 25 W/m2

(Up to 15 points)

RB 1-2 Dwelling Unit Indoor Comfort

Enhance dwelling unit indoor comfort either through the provision of better efficient air- conditioners or good natural ventilation design.

(a)(i) Use of energy efficient air-conditioners that are certified under the Singapore Energy Labelling Scheme.

OR

(a)(ii)Design for natural ventilation (applicable to development where air-conditioners are not provided).

• Building layout design : Proper design of building layout that utilises prevailing wind conditions to achieve adequate cross ventilation.

• Dwelling unit design : Good ventilation in indoor units through sufficient openings.

(b) Use of ventilation simulation software to identify the most effective building design and layout to achieve good natural ventilation.

Extent of Coverage : At least 90% of the air-conditioners used in all dwelling units

Air-conditioners labelled with : Two Ticks  – 2 points Three Ticks – 6 points Four Ticks  – 12 points

OR

0.6 point for every 10% of units with window openings facing north and south directions

Points scored = 0.6 x (% of units/10) (Up to 6 points)

0.6 point for every 10 % of living rooms and bedrooms designed with true cross ventilation

Points scored = 0.6 x (% rooms /10) ( Up to 6 points)

Points can only be scored if the recommendations from ventilation simulations are implemented

4 points

RB 1-3 Natural Ventilation in Common Areas

Design for natural ventilation in following common areas :

1. Lift lobbies and corridors

2. Staircases

Extent of Coverage : All applicable areas 1 point

1 point

Part 1 - Energy Efficiency

Green Mark Points

RB 1-4 Lighting

Encourage the use of better efficient lighting and daylighting in common areas to minimise energy consumption from lighting usage while maintaining proper lighting level.

1. Artificial lighting in common areas.

Baseline = Maximum lighting power budget stated in SS 530

2. Daylighting in the following areas :

1. Lift lobbies and corridors

2. Staircases

3. Carparks

0.3 point for every percentage improvement in the lighting power budget

Points scored = 0.3 x (% improvement)

(Up to 12 points)

1 point

1 point

1 point

RB 1-5 Ventilation in Carparks

Encourage the use of energy efficient design and control of ventilation systems in carparks.

1. Carparks designed with natural ventilation.

2. CO sensors are used to regulate the demand for mechanical ventilation (MV).

Note (1) : Where there is a combination of different ventilation modes adopted for carpark design, the points obtained will be prorated accordingly.

Naturally ventilated carparks - 8 points

Points scored based on the mode of mechanical

ventilation provided Fume extract – 6 points

MV with or without supply - 4 points

RB 1-6 Lifts

Encourage the use of lifts with the following energy efficient features :

1. AC variable voltage and variable frequency (VVVF) motor drive or equivalent.

2. Sleep mode features or equivalent.

Extent of Coverage : All lifts

1 point

1 point

RB 1-7 Energy Efficient Features

Encourage the use of energy efficient features which are innovative and have positive environmental impact.

Examples :

• Heat recovery devices

• Cool paints

• Motion sensors at staircase half landing

• Heat elevators

• Gas heaters

• Sun pipes

• etc

2 points for high impact item 1 point for medium impact item

0.5 point for low impact item (Up to 7 points)

Sub-Total (A) :

Sum of Green Mark Points obtained from RB 1-1 to 1-7

Part 1 - Energy Efficiency

Green Mark Points

RB 1-8 Renewable Energy

Encourage the application of renewable energy sources in buildings.

1. Solar energy

2. Other renewable energy

(Bonus points)

1 point for every 3 kWp of solar energy

1 point for every 1% replacement of electricity (exclude household’s usage) by renewable energy

(Up to 20 points)

PART 1 – ENERGY EFFICIENCY

CATEGORY SCORE :

Sub-total (A)

+

Bonus points (RB 1-8)

where Sub-Total (A) = Sum of Green Mark Points obtained

from RB 1-1 to 1-7

Part 2 – Water Efficiency

Green Mark Points

RB 2-1 Water Efficient Fittings

Encourage the use of water efficient fittings that are certified under the Water Efficiency Labelling Scheme (WELS).

1. Basin taps and mixers

2. Flushing cisterns

3. Showerheads, taps and mixers

4. Sink/Bib taps and mixers

5. All other water fittings

Rating based on Water Efficiency Labelling Scheme (WELS)

Extent of coverage :

At least 90% of the fitting type used

(Up to 10 points)

Good

V Good

Excellent

0.5

point

1

point

2

points

RB 2-2 Water Usage

Provision of sub-meters to monitor the major water usage such as irrigation, swimming pools and other water features.

1 point

RB 2-3 Irrigation System

Provision of suitable systems that utilise rainwater or recycled water for landscape irrigation to reduce potable water consumption.

1. Use of non potable water including rainwater for landscape irrigation.

2. Use of water efficient irrigation system.

1 point

Extent of Coverage : At least 50% of the landscape areas are served by the system

1 point

PART 2 – WATER EFFICIENCY

CATEGORY SCORE :

Sum of Green Mark Points obtained from RB 2-1 to 2-3

Part 3 – Environmental Protection

Green Mark Points

RB 3-1 Sustainable Construction

Encourage the adoption of building designs, construction practices and materials that are environmentally friendly and sustainable.

1. More efficient concrete usage for building components.

2. Conservation of existing building structure. Applicable to existing structural elements or building envelope.

3. Use of sustainable materials and products in building construction such as :

1. Environmental friendly products that are certified under the Singapore Green Labelling Scheme (SGLS).

2. Products with at least 30% recycled content by weight or volume (applicable only to non-structural elements).

Note (2) : For products that are certified under SGLS and with at least 30% recycled contents, points can only be scored either from RB 3-1(c)(i) or (c)(ii).

0.1 point for every percentage reduction in the prescribed Concrete Usage Index (CUI) limit for

residential buildings (refer to page 60 for CUI limit)

(Up to 4 points)

Extent of Coverage : Conserve at least 50 % of the existing structural elements or building envelope (by area)

2 points

1 point for high impact item

0.5 point for low impact item (Cap at 3 points)

1 point for high impact item

0.5 point for low impact item (Cap at 3 points)

(Up to 6 points)

RB 3-2 Greenery

Encourage greater use of greenery, restoration of trees to reduce heat island effect.

1. Greenery Provision (GnP) is calculated by considering the 3D volume covered by plants using the following Green Area Index (GAI) : Grass GAI = 1 ; Shrubs GAI = 3; Palms Trees GAI = 4; Trees GAI = 6

2. Restoration of trees on site, conserving or relocating of existing trees on site.

3. Use of compost recycled from horticulture waste.

GnP = 2.0 to < 3.0 –  1 point

GnP = 3.0 to < 3.5 –  2 points

GnP = 3.5 to < 4.0 –  3 points

GnP ≥ 4.0 –  4 points

1 point

1 point

Part 3 – Environmental Protection

Green Mark Points

RB 3-3 Environmental Management Practice

Encourage the adoption of environmental friendly practices during construction and building operation.

1. Implement effective environmental management programmes including monitoring and setting of targets to minimise energy use, water use and construction waste.

2. Building quality assessed under the Construction Quality Assessment System (CONQUAS) and Quality Mark Scheme.

3. Developer, main builder, M & E consultant and architect that are ISO 14000 certified.

4. Project team comprises one Certified Green Mark Manager (GMM) and/or one Certified Green Mark Professional (GMP).

5. Provision of building users’ guide including details of the environmental friendly facilities and features within the building and their uses in achieving the intended environmental performance during building operation.

6. Provision of facilities or recycling bins for collection and storage of different recyclable waste such as paper, glass, plastic etc.

1 point

1 point each (Up to 2 points)

0.25 point for each firm (Up to 1 point)

1 point for GMM / 2 points for GMP (Up to 3 points)

1 point

1 point

RB 3-4 Public Transport Accessibility

Promote the use of public transport or bicycles to reduce pollution from individual car use with the following provision :

1. Good access to nearest MRT/LRT stations or bus stops.

2. Adequate bicycle parking lots.

1 point

1 point

PART 3 – ENVIRONMENTAL PROTECTION

CATEGORY SCORE :

Sum of Green Mark Points obtained from RB 3-1 to 3-4

Part 4 – Indoor Environmental Quality

Green Mark Points

RB 4-1 Noise Level

Building design to achieve ambient internal noise level as specified :

55 dB ( 6am-10pm) LeqA 45 dB (10pm-6 am) LeqA

1 point

RB 4-2 Indoor Air Pollutants

Minimise airborne contaminants, mainly from inside sources to promote a healthy indoor environment.

1. Use of low volatile organic compounds (VOC) paints certified under the Singapore Green Labelling Scheme (SGLS).

2. Use of adhesives certified under the Singapore Green Labelling Scheme (SGLS) for composite wood products.

Extent of Coverage : At least 90% of the total internal wall areas

2 points

1 point

RB 4-3 Waste Disposal

Minimise airborne contaminants from waste by locating refuse chutes at open ventilation areas such as service balconies or common corridors.

1 point

RB 4-4 Indoor Air Quality in Wet Areas

Provision of adequate natural ventilation and daylighting in wet areas such as kitchens, bathrooms and toilets.

Extent of Coverage : At least 90% of all applicable areas

1 point

PART 4 – INDOOR ENVIRONMENTAL QUALITY

CATEGORY SCORE :

Sum of Green Mark Points obtained from RB 4-1 to 4-4

Part 5 – Other Green Features

Green Mark Points

RB 5-1 Green Features and Innovations

Encourage the use of other green features which are innovative and have positive environmental impact.

Examples :

• Pneumatic waste collection system

• Dual chute system

• Self cleaning façade system

• Infiltration trenches

• Integrated storm water retention/treatment into landscaping

• etc

2 points for high impact item 1 point for medium impact item

0.5 point for low impact item (Up to 7 points)

PART 5 – OTHER GREEN FEATURES

CATEGORY SCORE :

Sum of Green Mark Points obtained from RB 5-1

Green Mark Score (Residential)

Green Mark Score (Res) = ∑Category Score [(Part 1 – Energy Efficiency) +

(Part 2 – Water Efficiency) +

(Part 3 – Environmental Protection) + (Part 4 – Indoor Environmental Quality) + (Part 5 – Other Green Features)]

where Category Score for Part 1 ≥ 30 points and

∑Category Score for Part 2, 3, 4 & 5 ≥ 20 points

Part 1 – Energy Efficiency

Green Mark Points

(A) Applicable to Air-Conditioned Building Areas (with an aggregate air-conditioned areas > 500 m2)

NRB 1-1 Building Envelope – ETTV

Enhance the overall thermal performance of building envelope to minimise heat gain thus reducing the overall cooling load requirement.

Baseline : Maximum Permissible ETTV = 50 W/m2

2 points for every reduction of 1 W/m2 in ETTV from the baseline

Points scored = 100 – [2 x (ETTV)] where ETTV ≤ 50 W/m2

(Up to 15 points)

NRB 1-2 Air-Conditioning System

Encourage the use of better efficient air-conditioned equipment to minimise energy consumption.

Baseline : Minimum efficiency requirement of the air-conditioning system stated in SS 530 & SS CP 13.

The systems to be considered are as follows - (a)(i) Air-Conditioned Plant :

• Chiller

• Chilled-water pump

• Condenser water pump

• Cooling tower

(a)(ii) Air Distribution System :

• Air Handling Units (AHUs)

• Fan Coil Units (FCUs)

Note (1) : For buildings using district cooling system, there is no need to compute the plant efficiency under NRB 1-2 (a)(i). The points obtained will be pro-rated based on the air distribution system efficiency under NRB 1-2(a)(ii).

OR

2. Unitary Air-Conditioners/Condensing Units :

• Single-Spilt Unit

• Multi-Spilt Unit

• Variable Refrigerant Volume (VRV) System

Note (2) : Where there is a combination of centralised air-con system with unitary air-conditioned system, the computation for the points scored will only be based on the air-conditioning system with a larger aggregate capacity.

3. Sensors or similar automatic control devices are used to regulate outdoor air flow rate to maintain the concentration of carbon dioxide below 1000ppm

(a)(i) Air-Conditioned Plant

1.45 points for every percentage improvement in the efficiency of chiller, chilled-water pump and condenser water pump.

Points scored = 1.45 x (% improvement)

0.05 point for every percentage improvement in the performance required for cooling tower. Points scored = 0.05 x (% improvement)

(Up to 20 points) (a)(ii) Air Distribution System

0.5 points for every percentage improvement in the air distribution system efficiency.

Points scored = 0.5 x (% improvement)

(Up to 5 points)

OR

(b) Unitary Air-Conditioners/Condensing Units

1.5 points for every percentage (average) improvement in the efficiency of all unitary air- conditioners/ condensing units.

Points scored = 1.5 x (% improvement)

(Up to 25 points)

2 points

Sub-Total (A) :

Sum of Green Mark Points obtained from NRB 1-1 to 1-2

Weight Group

Weight range (kg/m2)

Maximum Thermal Transmittance (W/m2K)

Light

Under 50

0.8

Medium

50 to 230

1.1

Heavy

Over 230

1.5

Part 1 – Energy Efficiency

Green Mark Points

(B) Applicable to Non Air-Conditioned Building Areas (with an aggregate non air-conditioned areas > 10 % of total floor area excluding carparks)

NRB 1-3 Building Envelope – Design / Thermal Parameters

Enhance the overall thermal performance of building envelope to minimise heat gain which would improve indoor thermal comfort and encourage natural ventilation.

(a) Minimum direct west facing façade through building design orientation.

Note (3) : Orientation of façade that falls within the range of 22.5° N of W and 22.5° S of W will be defined as west facing facade. Core walls for lifts or staircases and toilets that are located within this range are exempted in computation.

(b)(i) Minimum west facing window openings.

(b)(ii) Effective sunshading provision for windows on the west façade with minimum shading of 30%.

3. Better thermal transmittance (U-value) of external west facing walls.

The U-value of external west facing walls should be equal or less than 2 W/m2K.

4. Better thermal transmittance (U-value) of roof.

Baseline: U-value for roof stated below depending on the weight range of roof structure:

Points scored = 10 – [0.2 x (% of west facing

facade areas over total façade areas)]

(Up to 10 points)

Where there is no west facing façade, the total points scored for this item will be 24 points; the NRB 1-3 b(i), b(ii) and (c) as listed below will not be applicable.

Points scored = 10 – [0.1 x (% of west

facing window areas over total west facing façade areas)]

Points scored =  0.1 x (% of west facing

window areas with sunshading devices over total west facing façade areas)

(Up to 10 points for NRB 1-3b(i) & b(ii))

Points scored =  0.04 x (% of the external

west facing walls areas with U value of 2 W/m2K or less over total west

facing facades areas) (Up to 4 points)

2 points for every 0.1 W/m2K reduction ( Up to 5 points)

Part 1 – Energy Efficiency

Green Mark Points

(B) Applicable to Non Air-Conditioned Building Areas (with an aggregate non air-conditioned areas > 10 % of total floor area excluding carparks)

NRB 1-4 Natural Ventilation (exclude carparks)

Enhance building design to achieve good natural ventilation.

1. Proper design of building layout that utilizes prevailing wind conditions to achieve adequate cross ventilation.

2. Use of ventilation simulation software or wind tunnel testing to identify the most effective building design and layout to achieve good natural ventilation.

0.8 point for every 10% of units/rooms with window openings facing north and south directions

Points scored = 0.8 x (% of units/10) (Up to 8 points)

Points can only be scored if the recommendations from ventilation simulations are implemented

(5 points)

Exception : For existing buildings, NRB 1-3(a) may be excluded in computation, the total Green Mark Points for Sub-Total (B) under Part 1 will be prorated accordingly.

Sub-Total (B) :

Sum of Green Mark Points obtained from NRB 1-3 to 1-4

Part 1 - Energy Efficiency

Green Mark Points

(C) General

NRB 1-5 Artificial Lighting

Encourage the use of better efficient lighting to minimise energy consumption from lighting usage while maintaining proper lighting level.

Baseline = Maximum lighting power budget stated in SS 530

0.5 point for every percentage improvement in lighting power budget

Points scored = 0.5 x (% improvement) (Including tenant lighting provision)

(Up to 12 points)

(Excluding tenant lighting provision) (Up to 5 points)

NRB 1-6 Ventilation in Carparks

Encourage the use of energy efficient design and control of ventilation systems in carparks.

1. Carparks designed with natural ventilation.

2. CO sensors are used to regulate the demand for mechanical ventilation (MV).

Note (4) : Where there is a combination of different ventilation modes adopted for carpark design, the points obtained will be prorated accordingly.

Naturally ventilated carparks – 5 points Points scored based on the mode of

mechanical ventilation provided Fume extract – 4 points

MV with or without supply - 3 points (Up to 5 points)

Part 1 – Energy Efficiency

Green Mark Points

(C) General

NRB 1-7 Ventilation in Common Areas

Encourage the use of energy efficient design and control of ventilation systems in the following common areas :

1. Toilets

2. Staircases

3. Corridors

4. Lift lobbies

5. Atriums

Extent of Coverage : At least 90 % of each applicable area

Points scored based on the mode of ventilation provided in the applicable areas

Natural ventilation – 1.5 points for each area Mechanical ventilation – 0.5 point for each area

(Up to 5 points)

NRB 1-8 Lifts and Escalators

Encourage the use of efficient lifts and escalators.

1. Lifts with the following energy efficient features :

1. AC variable voltage and variable frequency (VVVF) motor drive or equivalent.

2. Sleep mode features or equivalent.

2. Escalators with energy efficient features such as motion sensors.

Extent of Coverage : All lifts and/or escalators

1 point

1 point

1 point

NRB 1-9 Energy Efficient Practices & Features

Encourage the use of energy efficient practices and features which are innovative and have positive environmental impact.

1. Computation of energy consumption based on design load in the form of energy efficiency index (EEI).

2. Use of energy efficient features : Examples:

• Heat recovery system

• Motion sensors for staircase half landing

• Ductless fan for basement ventilation

• Sun pipes

• etc

1 point

3 points for every 1% energy saving over the total building energy consumption

(Up to 11 points)

Sub-Total (C) :

Sum of Green Mark Points obtained from NRB 1-5 to 1-9

Part 1 – Energy Efficiency

Green Mark Points

(C) General

NRB 1-10 Renewable Energy

Encourage the application of renewable energy sources in buildings.

(Bonus Points)

5 points for every 1% replacement of electricity (based on the total electricity consumption including tenant’s usage) by renewable energy

OR

3 points for every 1% replacement of electricity (based on the total electricity consumption excluding tenant’s usage) by renewable energy

(Up to 20 points)

PART 1 – ENERGY EFFICIENCY

CATEGORY SCORE :

Sub-Total (A) X Air-Conditioned Building Floor Area

Total Floor Area

+

Sub-Total ( B) X Non Air-Conditioned Building Floor Area

Total Floor Area

+

Sub-Total (C)

+

Bonus points (NRB 1-10)

where Sub-Total (A) = Sum of Green Mark Points obtained

under Section (A) that is NRB 1-1 to 1-2

Sub-Total (B)  = Sum of Green Mark Points obtained

under Section (B) that is NRB 1-3 to 1-4

Sub-Total (C)  = Sum of Green Mark Points obtained

under Section (C) that is NRB 1-5 to 1-9

If either Section (A) or Section (B) is not applicable, no prorating of areas is required for the score computation.

Part 2 – Water Efficiency

Green Mark Points

NRB 2-1 Water Efficient Fittings

Encourage the use of water efficient fittings that are certified under the Water Efficiency Labelling Scheme (WELS).

Rating based on Water Efficiency Labelling Scheme (WELS)

Points scored based on the number and water efficiency rating of the fitting type used

(Up to 8 points)

Good

V Good

Excellent

Weightage

4

6

8

NRB 2-2 Water Usage and Leak Detection

Promote the use of sub-metering and leak detection system for better control and monitoring.

1. Provision of sub-meters for major water uses which includes irrigation, cooling tower and tenants’ usage.

2. Linking all sub-meters to the Building Management System (BMS) for leak detection.

1 point

1 point

NRB 2-3 Irrigation System

Provision of suitable systems that utilise rainwater or recycled water for landscape irrigation to reduce potable water consumption.

1. Use of non potable water including rainwater for landscape irrigation.

2. Use of water efficient irrigation system.

1 point

Extent of Coverage : At least 50% of the landscape areas are served by the system

1 point

NRB 2-4 Water Consumption of Cooling Tower

Reduce potable water use for cooling purpose.

1. Use of cooling tower water treatment system which can achieve 6 or better cycles of concentration at acceptable water quality.

2. Use of NEWater or on-site and recycled water from approved sources.

1 point

1 point

PART 2 – WATER EFFICIENCY

CATEGORY SCORE :

Sum of Green Mark Points obtained from NRB 2-1 to 2-4

Part 3 – Environmental Protection

Green Mark Points

NRB 3-1 Sustainable Construction

Encourage the adoption of building designs, construction practices and materials that are environmentally friendly and sustainable.

1. More efficient concrete usage for building components.

2. Conservation of existing building structure Applicable to existing structural elements or building envelope.

3. Use of sustainable materials and products in building construction such as :

1. Environmental friendly products that are certified under the Singapore Green Labelling Scheme (SGLS).

2. Products with at least 30% by weight or volume (applicable only to non-structural elements).

Note (5) : For products that are certified under SGLS and with at least 30% recycled contents, points can only be scored either from NRB 3-1(c)(i) or (c)(ii).

0.1 point for every percentage reduction in the prescribed Concrete Usage Index (CUI) limit for non-residential buildings (refer to page 115 for CUI limit)

(Up to 4 points)

Extent of Coverage : Conserve at least 50 % of the existing structural elements or building envelope (by area)

2 points

1 point for high impact item

0.5 point for low impact item (Cap at 4 points)

1 point for high impact item

0.5 point for low impact item (Cap at 4 points)

(Up to 8 points)

NRB 3-2 Greenery

Encourage greater use of greenery, restoration of trees to reduce heat island effect.

1. Greenery Provision (GnP) is calculated by considering the 3D volume covered by plants using the following Green Area Index (GAI) : Grass GAI = 1 ; Shrubs GAI = 3; Palms Trees GAI = 4; Trees GAI = 6

2. Restoration of trees on site, conserving or relocating of existing trees on site.

3. Use of compost recycled from horticulture waste.

GnP = 0.5 to < 1.0 –  1 point

GnP = 1.0 to < 1.5 –  2 points

GnP = 1.5 to < 3.0 –  3 points

GnP ≥ 3.0 –  4 points

1 point

1 point

Part 3 – Environmental Protection

Green Mark Points

NRB 3-3 Environmental Management Practice

Encourage the adoption of environmental friendly practices during construction and building operation.

1. Implement effective environmental friendly programmes including monitoring and setting targets to minimise energy use, water use and construction waste.

2. Building quality assessed under the Construction Quality Assessment System (CONQUAS).

3. Developer, main builder, M & E consultant and architect that are ISO 14000 certified.

4. Project team comprises one Certified Green Mark Manager (GMM) and/or one Certified Green Mark Professional (GMP).

5. Provision of building users’ guide including details of the environmental friendly facilities and features within the building and their uses in achieving the intended environmental performance during building operation.

6. Provision of facilities or recycling bins for collection and storage of different recyclable waste such as paper, glass, plastic etc.

1 point

1 point

0.25 point for each firm (Up to 1 point)

1 point for GMM / 2 points for GMP (Up to 3 points)

1 point

1 point

NRB 3-4 Public Transport Accessibility

Promote the use of public transport or bicycles to reduce pollution from individual car use with the following provision :

1. Good access to nearest MRT/LRT stations or bus stops.

2. Adequate bicycle parking lots.

1 point

1 point

NRB 3-5 Refrigerants

Reduce the potential damage to the ozone layer and the increase in global warming through the release of ozone depleting substances and greenhouse gases.

1. Refrigerants with ozone depletion potential (ODP) of zero or with global warming potential (GWP) of less than 100.

2. Use of refrigerant leak detection system at critical areas of plant rooms containing chillers and other equipments with refrigerants.

1 point

1 point

PART 3 – ENVIRONMENTAL PROTECTION

CATEGORY SCORE :

Sum of Green Mark Points obtained from NRB 3-1 to 3-5

Part 4 – Indoor Environmental Quality

Green Mark Points

NRB 4-1 Thermal Comfort

Air-conditioning system is designed to allow for cooling load variations due to fluctuations in ambient air temperature to ensure consistent indoor conditions for thermal comfort.

Indoor temp between 22.5 to 25.5 °C Relative Humidity < 70%

2 points

NRB 4-2 Noise Level

Occupied spaces in buildings are designed with good ambient sound levels as recommended in SS CP 13.

2 points

NRB 4-3 Indoor Air Pollutants

Minimise airborne contaminants, mainly from inside sources to promote a healthy indoor environment.

1. Use of low volatile organic compounds (VOC) paints certified under the Singapore Green Labelling Scheme (SGLS).

2. Use of adhesives certified under the Singapore Green Labelling Scheme (SGLS) for composite wood products.

Extent of Coverage : At least 90% of the total internal wall areas

1 point

1 point

NRB 4-4 High Frequency Ballasts

Applicable to offices, classrooms and the like

Improve workplace lighting quality by avoiding low frequency flicker associated with fluorescent lighting with the use of high frequency ballasts in the fluorescent luminaries.

Extent of Coverage : At least 90% of

all applicable areas that are served by fluorescent luminaries

2 points

PART 4 – INDOOR ENVIRONMENTAL QUALITY

CATEGORY SCORE :

Sum of Green Mark Points obtained from NRB 4-1 to 4-4

Part 5 – Other Green Features

Green Mark Points

NRB 5-1 Green Features and Innovations

Encourage the use of other green features which are innovative and have positive environmental impact.

Examples :

• Pneumatic waste collection system

• Rainwater harvesting

• Dual chute system

• Self cleaning façade system

• Infiltration trenches

• Integrated storm water retention/treatment into landscaping

• etc

2 points for high impact item 1 point for medium impact item

0.5 point for low impact item (Up to 7 points)

PART 5 – OTHER GREEN FEATURES

CATEGORY SCORE :

Sum of Green Mark Points obtained from NRB 5-1

Green Mark Score (Non-Residential)

Green Mark Score (Non-Res) = ∑Category Score [(Part 1 – Energy Efficiency) +

(Part 2 – Water Efficiency) +

(Part 3 – Environmental Protection) + (Part 4 – Indoor Environmental Quality) + (Part 5 – Other Green Features)]

where Category Score for Part 1 ≥ 30 points and

∑Category Score for Part 2, 3, 4 & 5 ≥ 20 points

Residential Building Criteria

Responsibility

Part 1 - Energy Efficiency

RB 1-1 Building Envelope - RETV

QP (BP)1

RB 1-2 Dwelling Unit Indoor Comfort

• Use of energy efficient conditioners

• Design for Natural Ventilation

PE (Mechanical)2 QP (BP)

RB 1-3 Natural Ventilation in Common Areas

QP(BP)

RB 1-4 Lighting

• Artificial Lighting in common areas

• Daylighting

PE (Electrical) QP(BP)

RB 1-5 Ventilation in Carparks

PE (Mechanical)

RB 1-6 Lifts

PE (Electrical)

RB 1-7 Energy Efficient Features

• Heat Recovery Devices

• Motion Sensors /Photo Sensors

• Others

PE (Mechanical) PE (Electrical)

Appropriate Practitioners3

RB 1-8 Renewable Energy

PE (Electrical)

Part 2 – Water Efficiency

RB 2-1 Water Efficient Fittings

QP(BP)

RB 2-2 Water Usage

PE (Mechanical)

RB 2-3 Irrigation System

QP(BP)

Part 3 – Environmental Protection

RB 3-1 Sustainable Construction

Appropriate Practitioners

RB 3-2 Greenery

QP(BP)

RB 3-3 Environmental Management Practice

QP(BP)

RB 3-4 Public Transport Accessibility

QP(BP)

Part 4 – Indoor Environmental Quality

RB 4-1 Noise Level

QP(BP)

RB 4-2 Indoor Air Pollutants

QP(BP)

RB 4-3 Waste Disposal

QP(BP)

RB 4-4 Indoor Air Quality in Wet Areas

QP(BP)

Part 5 – Other Green Features

RB 5-1 Green Features and Innovations

Appropriate Practitioners

Non-Residential Building Criteria

Responsibility

Part 1 - Energy Efficiency

NRB 1-1 Building Envelope - ETTV

QP (BP)

NRB 1-2 Air-Conditioning System

PE (Mechanical)

NRB 1-3 Building Envelope – Design/ Thermal Parameters

QP (BP)

NRB 1-4 Natural Ventilation (exclude carparks)

QP (BP)

NRB 1-5 Artificial Lighting

PE (Electrical)

NRB 1-6 Ventilation in Carparks

PE (Mechanical)

NRB 1.7 Ventilation in Common Areas

PE (Mechanical)

NRB 1-8 Lift and Escalator

PE (Electrical)

NRB 1-9 Energy Efficient Practices / Features

PE (Mechanical)

• Heat Recovery System

• Auto Condenser Tube Cleaning System

PE (Mechanical)

• Energy Efficiency Index Computation

PE (Electrical)

• Motion Sensors /Photo Sensors

PE (Electrical)

• Others

Appropriate Practitioners

NRB 1-10 Renewable Energy

PE (Electrical)

Part 2 – Water Efficiency

NRB 2-1 Water Efficient Fittings

QP (BP)

NRB 2-2 Water Usage and Leak Detection

PE (Mechanical)

NRB 2-3 Irrigation System

QP (BP)

NRB 2-4 Water Consumption of Cooling Tower

PE (Mechanical)

Part 3 – Environmental Protection

NRB 3-1 Sustainable Construction

Appropriate Practitioners

NRB 3-2 Greenery

QP (BP)

NRB 3-3 Environmental Management Practice

QP (BP)

NRB 3-4 Public Transport Accessibility

QP (BP)

NRB 3-5 Refrigerants

PE (Mechanical)

Part 4 – Indoor Environmental Quality

NRB 4-1 Thermal Comfort

PE (Mechanical)

NRB 4-2 Noise Level

QP (BP)

NRB 4-3 Indoor Air Pollutants

QP (BP)

NRB 4-4 High Frequency Ballast

PE (Electrical)

Part 5 – Other Green Features

NRB 5-1 Green Features and Innovations

Appropriate Practitioners

Weight Group

Weight range (kg/m2)

Maximum Thermal Transmittance (W/m2K)

Light

Under 50

0.8

Medium

50 to 230

1.1

Heavy

Over 230

1.5

M1 Building Envelope – RETV

The residential envelope thermal transmittance value (RETV) of the building, as determined in accordance with the formula set out in the “Code on Envelope Thermal Performance for Buildings” issued by the Commissioner of Building Control, shall not exceed 25 W/m2.

M2 Roof – U Value

In respect of roofs without skylight, the average thermal transmittance (U-value) for the gross area of the roof shall not exceed the limit prescribed in the following Table 2-1 for the corresponding weight group.

Table 2-1 – Maximum Thermal Transmittance for Roof of Non Air-Conditioned Building

This requirement does not apply to building with an aggregate floor area not exceeding 500 m2, open sided sheds, covered walkways and linkways, store rooms and utility rooms or plants and equipment rooms.

M3 Air-Conditioning System

1. Where the cooling capacity of any air-conditioning system exceeds 30 kW, the equipment shall comply with the relevant provisions of SS 530 – Code of Practice for Energy Efficiency Standard for Building Services and Equipment.

2. Air-conditioning system shall be equipped with manual switches, timers or automatic controllers for shutting off part of the air-conditioning system to reduce energy use whenever conditions permit.

M4 Air Tightness and Leakage

All windows on the building envelope shall not exceed the air leakage rates specified in SS 212 – Specification for Aluminium Alloy Windows.

M5 Artificial Lighting

1. The maximum lighting power budget in a building shall comply with SS 530 – Code of Practice for Energy Efficiency Standard for Building Services and Equipment.

2. Lighting control for artificial lighting shall be provided in accordance with SS 530.

M6 Ventilation

Ventilation shall be adequately provided in a building for its intended occupancy.

1. Where natural ventilation is applicable, it shall be provided by means of openable windows or other openings with an aggregate area of not less than –

1. 5% of the floor area of the room or space required to be ventilated; and

2. 15% of the floor area of the aboveground car parking area required to be ventilated.

2. Where mechanical ventilation or air-conditioning systems are used, the ventilation rates of these systems shall comply with SS CP 13 – Code of Practice for Mechanical Ventilation and Air-Conditioning in Buildings.

M7 Electrical Sub-Metering

Provision of sub-metering to monitor energy consumption of key building services and energy usage of end users or tenants.

M8 Luminance Level

Building lighting is maintained at luminance level as stated in SS CP 38 – Code of Practice for Artificial Lighting in Buildings for various types of occupancy.

Weight Group

Weight range (kg/m2)

Maximum Thermal Transmittance (W/m2K)

Light

Under 50

0.5

Medium

50 to 230

0.8

Heavy

Over 230

1.2

Weight Group

Weight range (kg/m2)

Maximum Thermal Transmittance (W/m2K)

Light

Under 50

0.8

Medium

50 to 230

1.1

Heavy

Over 230

1.5

M1 Building Envelope – ETTV

The envelope thermal transfer value (ETTV) of the building, as determined in accordance with the formula set out in the “Code on Envelope Thermal Performance for Buildings” issued by the Commissioner of Building Control, shall not exceed 50 W/m2.

M2 Roof – RTTV

In respect of roofs with skylight, the roof thermal transfer value (RTTV) as determined in accordance with the formula set out in the “Code on Envelope Thermal Performance for Buildings” issued by the Commissioner of Building Control, shall not exceed 50 W/m2.

M3 Roof – U Value

In respect of roofs without skylight, the average thermal transmittance (U-value) for the gross area of the roof shall not exceed the limit prescribed in the following Table 3-1 and Table 3-2 for the corresponding weight group.

Table 3-1 – Maximum Thermal Transmittance for Roof of Air-Conditioned Building

Table 3-2 – Maximum Thermal Transmittance for Roof of Non Air-Conditioned Building

This requirement does not apply to building with an aggregate floor area not exceeding 500 m2, open sided sheds, covered walkways and linkways, store rooms and utility rooms or plants and equipment rooms.

M4 Air-Conditioning System

1. Where the cooling capacity of any air-conditioning system exceeds 30 kW, the equipment shall comply with the relevant provisions of SS 530 – Code of Practice for Energy Efficiency Standard for Building Services and Equipment.

2. Air-conditioning system shall be equipped with manual switches, timers or automatic controllers for shutting off part of the air-conditioning system to reduce energy use whenever conditions permit.

3. In any hotel building, control devices shall be installed in every guestroom such that the power to the air-conditioning required in a guestroom would automatically be turned off when the occupant is not in the room.

M5 Air Tightness and Leakage

1. All windows on the building envelope shall not exceed the air leakage rates specified in SS 212 – Specification for Aluminium Alloy Windows.

2. Where the door opening of any commercial unit is located along the perimeter of the building envelope or leading to an exterior open space, external corridor, passageway or pedestrian walkway, that unit shall –

1. be completely separated from the other parts of the building; and

2. has its air-conditioning system separated from and independent of the central system.

M6 Artificial Lighting

1. The maximum lighting power budget in a building shall comply with SS 530 – Code of Practice for Energy Efficiency Standard for Building Services and Equipment.

2. Lighting control for artificial lighting shall be provided in accordance with SS 530.

3. In any hotel building, control devices shall be installed in every guestroom such that the power to the lights in a guestroom would automatically be turned off when the occupant is not in the room.

M7 Ventilation

Ventilation shall be adequately provided in a building for its intended occupancy.

3. Where natural ventilation is applicable, it shall be provided by means of openable windows or other openings with an aggregate area of not less than –

1. 5% of the floor area of the room or space required to be ventilated; and

2. 15% of the floor area of the aboveground car parking area required to be ventilated.

4. Where mechanical ventilation or air-conditioning systems are used, the ventilation rates of these systems shall comply with SS CP 13 – Code of Practice for Mechanical Ventilation and Air- Conditioning in Buildings.

M8 Electrical Sub-Metering

Provision of sub-metering to monitor energy consumption of key building services and energy usage of end users or tenants.

M9 Luminance Level

Building lighting is maintained at luminance level as stated in SS CP 38 – Code of Practice for Artificial Lighting in Buildings for various types of occupancy and in SS 531:Part 1 : 2006 – Code of Practice for Lighting of Work Places where appropriate.

Part 1 – Energy Efficiency

RB1-1 RB1-2

Building Envelope-RETV Dwelling Unit Indoor Comfort

RB1-3

Natural Ventilation in Common Areas

RB1-4

Lighting

RB1-5

Ventilation in Carparks

RB1-6

Lifts

RB1-7 RB1-8

Energy Efficient Features Renewable Energy

Objectives

Enhance overall thermal performance of building envelope to minimise heat gain thus reducing the overall cooling load requirement.

Applicability

Applicable to residential buildings with GFA of 2000 m2.

Baseline Standard

Maximum permissible RETV = 25 W/m2

RETV stands for Residential Envelope Transmittance Value.

The computation of RETV shall be based on the methodology specified in the Code on Envelope Thermal Performance for Buildings issued by BCA.

Requirements

Up to 15 points can be scored for building envelope with better thermal performance than the baseline standard :

3 points for every reduction of 1 W/m2 in RETV from the baseline. Points scored = 75 – [3 x (RETV)] where RETV ≤ 25 W/m2

For developments consisting of more than one residential building, the weighted average of the RETVs based on the façade areas of these buildings shall be used as the basis for point allocation.

That is

RETV Weighted         = ∑ (RETVbldg xAbldg) / Adevt

average

where RETV       = RETV for a residential building (W/m2)

bldg

Abldg = Summation of all facade areas that enclose all living rooms, dining rooms, study rooms and bedrooms of a residential building (m2)

Adevt = Summation of total applicable facade areas of all residential buildings within the development (m2) (i.e. ∑ A )

bldg

Documentary Evidences

• Architectural elevation drawings showing the composition of the different façade or wall systems that are relevant for the computation of RETV;

• Architectural plan layouts and elevations showing the living rooms, dining rooms, study rooms and bedrooms;

• Extracts of the tender specification or material schedules showing the salient data of the material properties that are to be used for the façade or external wall system; and

• RETV calculation.

References

Code on Envelope Thermal Performance for Buildings issued by BCA.

Rating

Point Allocation

2

6

12

Objectives

Enhance building design to achieve good natural ventilation for better indoor comfort or through the use of better efficient air-conditioners if needed.

Applicability

Applicable to all dwelling units within the development.

Baseline Standard

As specified under the Singapore Energy Labelling Scheme for air-conditioners.

Requirements

For development with provision of air-conditioners

1-2 (a)(i) Up to 12 points can be scored for the use of the air-conditioners that are certified under the Singapore Energy Labelling Scheme based on the following rating.

Extent of coverage : At least 90% of air-conditioners used in all dwelling units are energy labelled

OR

For developments where air-conditioners are not provided

2. (a)(ii) Up to 12 points can be scored for the following design :

• Building layout design that utilises prevailing wind conditions to achieve adequate cross ventilation. (Up to 6 points).

0.6 point for every 10% of units with window openings facing north and south directions

Points scored = 0.6 x (% of units/10)

• Dwelling unit design that allows for true cross ventilation in the living rooms and bedrooms of the dwelling units (Up to 6 points).

0.6 point for every 10 % of living rooms and bedrooms designed with true cross ventilation

Points scored = 0.6 x (% rooms /10)

Note: In Singapore, the prevailing wind comes from two predominant directions; that is the north to north-east during the Northeast monsoon season and south to south- east during the South-west monsoon season.  Hence, buildings designed with window openings facing the north and south directions have the advantage of the prevailing wind conditions which would enhance indoor thermal comfort. Meteorological data on the more precise wind direction and velocity of the site location can also be used as the basis for the design.

It is not necessary for the window openings to be located perpendicularly to the prevailing wind direction.  An oblique angle is considered acceptable (see illustrations next page).

Illustrations on building layout design that facilitate cross ventilation

Prevailing wind directions from north to north-east

Prevailing wind directions from south to south-east

Illustration 1 – Building layout showing all dwelling units with window openings facing the north and south direction. In this instance, all units can be considered meeting the requirement 1-2(a)(ii)

Prevailing wind directions from north to north-east

A

A

1. A C C

2. B B

B

Prevailing wind directions from south to south-east

Illustration 2 – Building layout showing all dwelling unit Type A and B with window openings facing either the north or south direction. The dwelling unit Type C has no window openings in the north and south directions. In this instance, no unit can be considered meeting the requirement 1-2(a)(ii)

Prevailing wind directions from north to north-east

Illustration 3 – Building layout showing the window openings of all dwelling units facing the north and south direction except dwelling unit 02. Dwelling 02 has window openings facing only the south direction and hence it is

02 not considered meeting the

requirement 1-2(a)(ii)

Prevailing wind directions from

south to south-east Prevailing wind directions from north to north-east

Illustration 4 – Building layout showing the window openings of all dwelling units facing either the north or south direction and hence they are not considered meeting the requirement

1-2(a)(ii)

Prevailing wind directions from south to south-east

Illustrations on dwelling unit design that facilitates true cross ventilation

Dwelling unit design is considered to have true cross ventilation when there is a reasonably unobstructed air flow path between the windows or vents on opposite sides of the building. For this requirement, the main entrance of the dwelling units is assumed to be closed and all the windows / internal doors are assumed to be open.

Bedroom   Bedroom 2 1

Living room Living Room

Bedroom 1

Illustration 5 – Dwelling unit layout Illustration 6 – Dwelling unit layout showing that both living room and showing only living room and bedroom 1 bedroom 1 are considered to have are considered to have true cross

true cross ventilation and meet the ventilation. Bedroom 2 is not considered requirement 1-2(a)(ii) meeting the requirement 1-2(a)(ii)

2. (b) 4 points for the use of ventilation simulation software or wind tunnel testing to identify the most effective building design and layout in achieving good natural ventilation. The design should provide an average wind velocity  within the space of at least 0.6 m/s or more. Points can only be scored if the recommendations from the ventilation simulation or wind tunnel testing are implemented.

The ventilation simulation shall be carried out with the following conditions:

• Assumed wind velocity of 2m/s in the north and south directions or based on meteorological data on precise wind direction and velocity of the proposed site location for the month of December and June.

• Characteristics of the surroundings and buildings which have significant impact on the wind pattern and indoor air velocity to be included in the modeling and simulation.

Documentary Evidences

For 1-2(a)(i) – For dwelling units with provision of air-conditioners

• Extracts of the tender specification showing the provision of the types of air-conditioners for the dwelling units of the development;

• Schedule of air-conditioners showing the numbers, types and the approved rating from the Singapore Energy Labelling Scheme; and

• Technical product information of the air-conditioners and approved rating.

For 1-2(a)(ii) – For development where air-conditioners are not provided

• Floor plan of all the unit types with highlights of those with window openings facing the north and south directions and/or with true cross ventilation;

• Schedules showing the total number of units in the development and those with window openings facing the north and south direction.

• Schedules showing the total number of living rooms and bedrooms in the development and those with true cross ventilation.

• Calculation showing the percentage of living rooms and bedrooms of dwelling units with true cross ventilation in the prescribed tabulated format as shown in the worked example 1-2(a)(ii).

For 1-2(b) – Ventilation Simulation

• Ventilation simulation or wind tunnel testing reports summarizing the analysis and modelling results for each typical space as well as the recommendations for design.

References

-

Worked Example 1-2(a)(i)

A residential development with one block of 18-storey apartments comprises 108 units in total. There are 36 two-bedroom unit type and 68 three-bedroom unit type and 4 penthouses.

All dwelling units are provided with air-conditioners. All the two-bedroom and three- bedroom unit types are provided with spilt unit wall mounted air-conditioners with 4-tick energy label. The four penthouses are provided with ducted air-conditioning system with no energy label.

Total no. of units = 108

No. of units with air-conditioners with 4-tick energy label = 36 +68 = 104 Percentage of units with air-conditioners = 104/108 x 100 = 96% > 90% ok Points scored for 1-2(a)(i) = 12 points

Bedroom 2 Bedroom 1

Living room

Two-bedroom Type A

Bedroom 1     Bedroom 2

Living room

Two-bedroom Type B

Both living room and bedroom 1 are considered to have true cross ventilation. Bedroom 2 does not meet the requirement.

Both living room and bedroom 1 are considered to have true cross ventilation. Bedroom 2 does not meet the requirement.

Bedroom 2

Living room

Bedroom 1

Two-bedroom Type C

Bedroom 2

Living room

Bedroom 1

Two-bedroom Type D

Only living room is considered to have true cross ventilation. Both bedroom 1 & 2 do not meet the requirement.

Only living room is considered to have true cross ventilation. Both bedroom 1 & 2 do not meet the requirement.

Type of dwelling unit

No of units (a)

For each unit

Total living rooms and bedrooms with true cross ventilation

(b + c) x a

Living room with true cross ventilation

(b)

Bedrooms with true cross ventilation

(c)

2-bedroom Type A

10

1

1

20

2-bedroom Type B

10

1

1

20

2-bedroom Type C

10

1

0

10

2-bedroom Type D

10

1

0

10

Total

60

Objectives

Enhance building design to achieve good natural ventilation in common areas.

Applicability

Applicable to the following common areas of the development.

• Lobbies and Corridors

• Staircases

Baseline Standard

-

Requirements

1-3(a) 1 point can be scored if all the lift lobbies (including private lift lobbies) and corridors are designed to be naturally ventilated.

1-3(b) 1 point can be scored if all the staircases are designed to be naturally ventilated.

Documentary Evidences

For 1-3(a) and (b)

• Plan layouts showing the applicable common areas and confirmation that they are designed to be naturally ventilated.

References

-

Worked Example

1-3(a) and (b)

Proposed development has the following provision :

All lift lobbies and corridors are designed to be naturally ventilated except for two private lobbies of the penthouses units which are designed with air-conditioning system. All staircases are designed to be naturally ventilated

No point for 1-3(a) as not all the lift lobbies are naturally ventilated.

1 point for 1-3(b) for staircases that are all designed to be naturally ventilated. Therefore, points scored for 1-3 = 1 point

Objectives

Encourage the use of better efficient lighting and daylighting in common areas to minimise energy consumption from lighting usage while maintaining proper lighting level.

Applicability

Applicable to lighting provisions for the type of usage specified in the SS 530 Clause 7 – Lighting power budget pertaining to common areas and facilities within the residential developments such as staircases, lobbies, corridors, indoor carparks and landscape areas .

It is not applicable to lighting provisions for dwelling units.

Baseline Standard

Maximum lighting power budget stated in SS 530 - Code of Practice for Energy Efficiency Standard for Building Services and Equipment.

Requirements

1-4 (a) Up to 12 points can be scored for the improvement in the lighting power budget in common areas :

0.3 point for every percentage improvement in the lighting provisions over the baseline standard. That is

Points scored = 0.3 x (% improvement)

Display lighting and specialised lighting are to be included in the calculation of lighting power budget.

The design service illuminance, lamp efficacies and the light output ratios of luminaries shall be in accordance with SS CP 38 – Code of Practice for Artificial Lighting in Buildings where applicable.

1-4(b)(i)  1 point for provision of daylighting for lift lobbies and corridors. 1-4(b)(ii) 1 point for provision of daylighting for staircases.

1-4(b)(iii) 1 point for provision of daylighting for carparks.

Documentary Evidences

For 1-4(a)

• Lighting layout plan;

• Lighting schedules showing the numbers, locations and types of luminaries used;

• Calculation of the proposed lighting power budget and the percentage; improvement in the prescribed tabulated format as shown in the worked example 1-4(a); and

• Technical product information of the lighting luminaries used.

For 1-4(b)

• Extracts of the tender specification or drawings showing the use of daylighting for lift lobbies and corridors, staircases and carparks where applicable.

Description

Areas (m2)

(A)

Light Fitting Type

(B)

Power Consumption per fitting (W)

(C)

Ballast Loss

(W)

(D)

No. of Fittings

(E)

Total power consumption based on fitting type

[(C+D) x (E)]

Corridors

580

T5

1x28

3

70

2170

Staircase

420

T5

1x28

3

35

1085

Carparks

1500

T5

1x28

3

130

4030

Exterior Lighting

200

LED

bollard

4x 1

3

20

140

Floodlight CDM-TC

1x 35

4

15

585

Total :

8010

Description

Areas (m2)

(A)

Design Data

SS 530 Requirements

Total Power Consumption (by area)(W)

(F)

Design Lighting Power Budget (W/m2)

(F/A)

Reference Lighting Power Budget (W/m2)

(H)

Reference  Total Power Consumption (by area) (W)

(H x A)

Corridors

580

2170

3.74

10

5800

Staircase

420

1085

2.85

6

2520

Carparks

1500

4030

2.69

5

7500

Exterior Lighting

200

725

3.63

5

1000

Total :

8010

16820

References

SS 530 – Code of Practice for Energy Efficiency Standard for Building Services and Equipment.

Worked Example 1-4 (a)

1. Determine the total power consumption based on the lighting layout design for each area and light fitting types used

2. Calculate the total power consumption based on the maximum lighting power budget stated in SS 530.

3. Calculate the percentage improvement in the total power consumption.

Table 1-4(a)-1 : Total power consumption based on each fitting type

Table 1-4(a)-2 : Total power consumption based on design and SS 530 requirements

Therefore Σ(   Σ Σ(

% improvement in the lighting power budget = [ HxA) - (F)] / HxA ) x 100

= (16820 - 8010)/16820 x 100

= 52.38%

Points scored = 0.3 x 52.38% = 15.7 points > 12 points (max) Therefore, points scored for 1-4(a) should be 12 points (max)

Objectives

Encourage the use of energy efficient design and control of ventilation systems in carparks.

Applicability

Applicable to all carpark spaces in the development.

Baseline Standard

-

Requirements

1-5(a) 8 points can be scored for carpark spaces that are fully naturally ventilated.

1-5(b) For carparks that have to be mechanically ventilated, points can be scored for the use of carbon monoxide (CO) sensors in regulating such demand based on the mode of mechanical ventilation (MV) used; 6 points for carparks using fume extract system and 4 points for those with MV with or without supply.

Note : Where there is a combination of different ventilation modes adopted for carpark design, the points scored under this requirement will be prorated accordingly.

Documentary Evidences

For 1-5 (a) and (b)

• Plan layouts showing all carpark provisions for the development with highlights of the carpark spaces that are designed to be naturally ventilated and/or mechanical  ventilated;

• Plan layouts indicating the locations of CO sensors and the mode of ventilation adopted for the design; and

• Calculation showing the points allocation if there is a combination of different ventilation mode adopted for the carpark design.

References

SS CP 13 – Code of Practice for Mechanical Ventilation and Air-Conditioning in Buildings.

Worked Example 1-5

Proposed development has two levels of basement carparks. Level 1 basement carpark (B1) is designed with more than 20% openings for natural ventilation and fume extract system. Level 2 basement carpark (B2) is fully mechancially ventilated. CO sensors are installed to control the ventilation system for both carpark levels.

Areas of basement capark – B1 = 700 m2 Areas of basement carpark– B2 = 500 m2 Total areas = 1200 m2

Points scored for 1-5 = (700/1200) x 6 + (500/1200) x 4

= 5.17 points

Objectives

Encourage the use of energy efficient lifts.

Applicability

Applicable to all lifts in the development.

Baseline Standard

-

Requirements

1 point can be scored for the use of lifts with energy efficient features such as AC variable voltage and variable frequency (VVVF) motor drive or equivalent

1 point can be scored for the use of lifts with sleep mode features.

Documentary Evidences

Extracts of the tender specification indicating the types of lifts and related features used.

References

-

Worked Example 1-6

Proposed development has the following provision:

All lifts are gearless traction machine with sleep mode features 1 point for the use of gearless traction machine.

1 point for sleep mode operation. Therefore, points scored for 1-6 = 2 points

Objectives

Encourage the use of energy efficient features which are innovative and have positive environmental impact in terms of energy saving.

Applicability

Applicable to practices and features that are not listed in the requirements under Part 1 – Energy Efficiency.

Baseline Standard

-

Requirements

Up to 7 points can be scored for the use of the following approved energy efficient features based on their potential environmental benefits and the extent of coverage.

1. Use of heat recovery devices

• 2 points for more than 50% of all dwelling units

• 1 point for at least 25% of all dwelling units

• 0.5 point for club house or other common facilities

2. Use of thermal insulation or cool paints on the east and west facing external walls

• 2 points for window to wall ratio (WWR) of less than 0.5

• 1 point for WWR that is between 0.5 to 0.75

• 0.5 point for WWR of more than 0.75

3. Use of motion sensors for private lift lobbies, staircases, common toilets

• 1 point for at least 50 motion sensors installed

• 0.5 point for less than 50 motion sensors installed

4. 1 point for the use of heat elevator in at least 90% of all dwelling units’ water heater systems.

5. 1 point for the use of gas water heaters in at least 90% of all dwelling units.

6. Use of software analysis and simulation to optimise the capacity and sizing of the air-conditioning system of dwelling units to achieve energy savings

(as compared with the SS 530 requirements).

• 1 point for at least 30% energy savings

• 0.5 point for at least 15% energy savings

7. 1 point for the provision of clothes drying facilities and open spaces for at least 90% of the dwelling units.

8. Use of sun pipes for natural lighting.

• 1 point for more than 10 sun pipes

• 0.5 point for at least 5 sun pipes

9. 0.5 point for the provision of ductless fans for basement ventilation.

10. 0.5 point for the computation of Energy Efficiency Index (EEI) for common facilities of the development.

Description

Daily Usage (hr)

A)

Mechanical Load

MV fan (plant room)

9

Car park fan

4

A/C for club house

12

A/C for lobbies

12

A/C for guard house

24

Domestic pump

2

Ejector pump

2

Booster pump

3

Sump pumps

0.5

B)

Lift Load

Passenger lifts

2

Service lift

2

C)

General lighting

Car park lighting - 24 hours operation

24

Car park lighting - 5 hours operation

5

Guard house lighting

12

Facade lighting

5

Landscape lighting - 12 hours operation

12

Landscape lighting - 5 hours operation

5

Lift lobbies, corridors & staircase lighting - 12 hours operation

12

Lift lobbies, corridors & staircase lighting - 5 hours operation

5

D)

Club Facilities

Club house interior lighting

12

Power to Gym equipment, SPA, etc

6

Swimming pool filtration

12

Water features

8

E)

Others

Facilities A

To estimate

Facilities B

To estimate

Description

Estimated Load (KW)

Daily Usage (hr)

Load per day (KWh)

A) Mechanical Load

MV fan (plant room)

9

9

81

Carpark fan

320

4

1280

A/C for club house

8

12

96

A/C for lobbies (1st sty & Basement)

0

12

0

A/C for guard house

2

24

48

Domestic pump

70

2

140

Ejector pump

13

2

26

Booster pump

28

3

84

Sump Pumps

12

0.5

6

B) Lift Load

Passenger Lifts

470

2

940

Service Lifts

0

2

0

C) General lighting

Carpark lighting – 24 hours operation

23

24

552

Carpark lighting - 5 hours operation

23

5

115

Guard house lighting

0.3

12

3.6

Facade lighting

0

5

0

Landscape lighting - 12 hours operation

30

12

360

Landscape lighting - 5 hours operation

28

5

140

Lift lobbies, corridor& staircase Lighting - 12 hours operation

20

12

240

Lift lobbies, corridor& staircase lighting - 5 hours operation

19

5

95

D) Club Facilities

Club house interior lighting

12

12

144

Power to Gym equipment, SPA, etc

85

6

510

Swimming Pool Filtration

50

12

600

Water Feature

25

8

200

Total kWh per day 5660.60

Documentary Evidences

• Extracts of the tender specification showing the provision of the proposed energy efficient features and the extent of implementation where applicable;

• Technical product information on the energy efficient features used; and

• Calculation of the potential energy savings that could be reaped from the use of these features.

• Calculation of the Energy Efficiency Index (EEI) using the pre-determined daily usage pattern as in Table 1-7 and in the prescribed tabulated format as shown in the worked example 1-7(x).

References

-

Worked Example 1-7(x)

Background info :

Proposed residential development with the following estimated electricity consumption for common facilities.

Table 1-7(x) : Estimated electricity consumption for common facilities

Calculation of EEI for Common Facilities :

Total electricity consumption per day = 5660.60 kWh/day EEI = (TEC / GFA) x 365 days

= (5660.60 / 40 000) x 365

= 51.65 kWh/m2/yr

Points scored for 1-7(x) = 0.5 point

Objectives

Encourage the use of renewable energy sources in buildings.

Applicability

Includes all renewable energy sources

Baseline Standard

-

Requirements

Up to 20 Bonus points can be scored based on the percentage replacement of electricity by the renewable energy source :

For solar energy : 1 point for every 3 kWp of solar energy

Points scored = (kWp of the solar energy) / 3

For other renewable : 1 point for every 1% replacement of electricity (based on energy sources annual electricity consumption exclude household’s

usage) by renewable energy

Documentary Evidences

• Extracts of the tender specification and plans showing the location of the renewable energy system and the extent of implementation;

• Technical product information on the salient features of the renewable energy system and the expected renewable energy generated; and

• Calculation of the percentage replacement of electricity and the total annual electricity consumption of the development.

References

-

Worked Example 1-8

A residential development with the following provision :

Installation of 5.15 KWp solar array on the roof of its open car park. Points scored for 1-8 = 1 point for every 3 kWp of solar energy

= (5.15) / 3 = 1.72 points

Part 2 – Water Efficiency

RB2-1

Water Efficient Fittings

RB2-2

Water Usage

RB2-3

Irrigation System

WELS Rating

Water Efficiency

Point Allocation

Good

0.5

Very Good

1

Excellent

2

Objectives

Reduce the use of potable water by using water efficient fittings covered under the Water Efficiency Labelling Scheme (WELS).

Applicability

Applicable to the water fittings covered by the WELS and used in dwelling units :

• Basin taps and mixers • Showerheads, taps and mixers

• Flushing cistern • All other water fittings

• Sink/bib taps and mixers

Baseline Standard

As specified under Water Efficiency Labelling Scheme (WELS).

Requirements

Up to 10 points can be scored based on the number and water efficiency rating of the fitting type used for dwelling units.

Extent of coverage : At least 90% of each fitting type used.

Documentary Evidences

• Extracts of the tender specification showing all the water fitting provisions for the development;

• Water fitting schedules showing the numbers, types and the approved rating of the proposed fittings in the prescribed tabulated format shown in the worked example; and

• Calculation showing the percentage of proposed water fittings that are approved under WELS.

References

For more information about WELS, refer to Inspectorate Branch

Water Demand Management & Inspectorate Division Water Supply (Network Department)

PUB

Objectives

Promote the use of sub-metering for better control and monitoring of major water usage.

Applicability

Applicable to sub-metering provisions for major water uses of the building developments.

Baseline Standard

-

Requirements

1 point can be scored if sub-meters are provided for all major water uses i.e. irrigation system, swimming pools and other water features where applicable.

Documentary Evidences

• Extracts from the tender specification stating the locations and provision of sub- metering for all major water uses.

• Schematic drawings of cold water distribution system showing the location of the sub-metering provided.

References

-

Objectives

Reduce potable water consumption by provision of suitable systems that utilise rainwater or recycled water for landscape irrigation.

Applicability

Applicable to residential development with landscaping provision.

Baseline Standard

-

Requirements

2-3(a)  1 point can be scored for the use of non-potable water including rainwater for landscape irrigation.

2-3(b) 1 point can be scored if more than 50% of the landscape areas are served by water efficient irrigation system with features such as automatic sub-soil drip irrigation system with rain sensor control.

Documentary Evidences

For 2-3(a)

• Extracts of the tender specification showing how the non-potable water source is to be provided;

• Relevant drawings showing the location and design of the non-potable water source; and

• For rainwater harvesting and storage system, approval letter from PUB is to be provided.

For 2-3(b)

• Extracts of the tender specification showing the provision and details of water efficient irrigation system;

• Relevant layout plans showing the overall landscape areas and the areas that would be served using the system; and

• Calculation showing the percentage of the landscape areas that would be served using the system.

References

-

CATEGORY

Concrete Usage Index (CUI) limit (m3/m2)

Residential (15 storey & below)

0.55

Residential (above 15 storey)

0.60

Objectives

Encourage the adoption of building designs, construction practices and materials that are environmentally friendly and sustainable.

Applicability

Generally applicable to all building developments.

Baseline Standard

-

Requirements

3-1(a) Up to 4 points are allocated to encourage more efficient concrete usage for building components based on the percentage reduction in the prescribed Concrete Usage Index (CUI) limit.

Note : Concrete Usage Index (CUI) is an indicator of the amount of concrete used to construct the superstructure which includes both the structural and non-structural elements. CUI does not include the concrete used for external works and sub- structural works such as basements and foundations. CUI is defined as the volume of concrete in cubic metres needed to cast a square metre of constructed floor area. It is expressed as:

Concrete Usage Index  = Concrete Volume in m3

Constructed Floor Area in m2

Table 3-1(a) CUI Limit for Residential Building

3-1(b) Up to 2 points can be scored if more than 50% of the existing structural elements or building envelopes (by areas) are conserved during redevelopment. Structural elements refer to slabs, columns, beams and load bearing walls.

3-1(c) Up to 6 points are allocated to encourage the use of sustainable materials and products in building construction such as :

1. Up to 3 points for the use of environmental friendly products that are certified under the Singapore Green Labelling Scheme (SGLS) where

1 point for each high impact item and 0.5 point for each low impact item.

2. Up to 3 points for the use of products (applicable only for non-structural elements) with at least 30% recycled content by weight or volume where 1 point for each high impact item and 0.5 point for each low impact item

Note (1) : The use of environmental friendly products or recycled materials used for all dwelling units of the development are considered as high impact. Items that are used in common areas, external works and communal facilities are considered as low impact.

Note (2) : The point allocated for low volatile organic compound (VOC) paints and adhesives certified under SGLS can be found in RB 4-2 and hence shall not be included in the scoring for RB 3-1(c)(i) and (ii).

Concrete usage for the superstructure

Constructed floor areas

For 1st storey = 587 m3 From 2nd to 15th storey = 5400 m3 (including roof level)

Therefore,

Total concrete usage  = 5987 m3

For 1st storey = 1000 m2 From 2nd to 15th storey = 14000 m2 (including roof level)

Therefore,

Total constructed floor area = 15000m2

Documentary Evidences

For 3-1(a)

• Architectural and structural plan layout, elevation and sectional plans showing the type of wall system used, the dimensions and sizes of all the building and structural elements; and

• Calculation showing the quantity of concrete for each floor level in the prescribed tabulated format shown in worked example 3-1(a). The calculation should include all the building elements as listed in the worked example.

For 3-1(b)

• Architectural and structural plan layout, elevation and sectional plans of the proposed building showing the areas of the existing building envelope or structural elements that are to be conserved;

• A summary sheet listing each area of the existing building envelope or structural elements that are to be conserved;

• Calculation showing that the percentage of building envelope or structural elements being conserved; and

• Extracts from the tender specification and documents indicating the portion of existing building envelope or structural elements to be conserved.

For 3-1(c)

• Extracts from the tender specification showing the requirements to incorporate the environmental friendly products that are certified with SGLS.

• Extracts from the tender specification showing the requirements to incorporate the use of recycled products

• Technical product information on the recycled products and their recycled contents by weight or volume.

References

-

Worked Example 3-1(a)

Proposed development comprises a 15 storey residential block with a basement carpark and the following details :

Note : The concrete usage for foundation and two basements are not required to be included.

5987

Concrete Usage Index CUI = = 0.4 m3/m2

15000 Ref t   t e

l  wi

For residential buildings ≤ 15 storey, the CUI limit = 0.55 Tab -1   )

f r re

% reduction in CUI = (0.55-0.4)/(0.55) = 27 % eta ls

Points scored = 0.1 x (27%)= 2.7 points

COMPUTATION OF CONCRETE USAGE INDEX RESIDENTIAL BLDG

Project Reference No.: AXXXX-00001-2007 Total no. of storey for the project:  15

Block No : A

Structural System

Thickness (mm) or size (mm x mm)

Volume of concrete (m3)

Remark *

1

1st storey

1.1 Columns

200x400, 200x200

72

Precast

1.2 Beams

200x400, 200x500

145

Precast

1.3 Slabs

150,200

265

Post – tensioned

1.4 Staircases

150

30

Precast

1.5 Suspended structures like planter boxes, bay windows, ledges etc

150

10

Precast

1.6 Parapets

150

5

RC

1.7 External walls - loadbearing walls

Nil

0

_

1.8 External walls – non-loadbearing walls

125

15

RC

1.9 Internal walls – loadbearing walls

200

40

RC

1.10 Internal walls – non- loadbearing walls

Nil

0

Light weight concrete

1.11 Others (kerbs, ramps, services risers, etc)

Not required

5

RC

Total volume of concrete for this storey (m3)

587

Total constructed floor area for this storey (m2)

1000

2

Typical floor layout

2.1 Columns

200x400, 200x200

55

Precast

2.2 Beams

200x400, 200x500

45

Precast

2.3 Slabs

150,200

160

Post – tensioned

2.4 Staircases

150

30

Precast

2.5 Suspended structures like planter boxes, bay windows, ledges etc

150

10

Precast

2.6 Parapets

150

5

RC

2.7 External walls - loadbearing walls

Nil

0

_

2.8 External walls – non-loadbearing walls

125

15

RC

COMPUTATION OF CONCRETE USAGE INDEX RESIDENTIAL BLDG

Project Reference No.: AXXXX-00001-2007 Total no. of storey for the project:  15

Block No : A

Structural System

Thickness (mm) or size (mm x mm)

Volume of concrete (m3)

Remark *

2

2nd storey to 30th storey ( Typical floor layout)

2.9  Internal walls – loadbearing walls

200

40

RC

2.10.Internal walls – non- loadbearing walls

Nil

0

–

2.11 Others (kerbs, ramps, services risers etc)

Nil

0

–

Volume of concrete for one storey (m3)

360

Constructed floor area for one storey

933.3

Total volume of concrete for 2nd to 15th storey

(including roof level)

360 X 15 = 5400

Total constructed floor area for 2nd to 15th storey (m2)

(including roof level)

933.3 x 15 = 14000

Total volume of concrete for this project (m3)

5987

Total constructed floor area for this project (m2)

15000

Concrete Usage Index (CUI in m3/m2)

0.4

Building System

Area to be conserved (m2)

Total Wall Area (m3)

1. Façade Type A

500

1000

2. Façade Type B

2000

3000

Total :

2500

4000

% area of existing building envelope being conserved

2500/4000 x 100 = 62.5% > 50% ok

Points scored :

2 points

Worked Example

3-1(a) – Cont’d

* To indicate if the structural elements is of precast concrete, post-tensioned concrete, high strength concrete (> Grade 60 ) or reinforced concrete (RC) under the ‘Remarks’ column

Important notes : The quantities of the concrete for all the structural and non-structural elements for each floor level are computed. All the elements listed in the table such as columns, beams, slabs, suspended structures (like planter boxes, bay windows and ledges etc) , parapets, walls and others (service risers, kerbs, ramps etc) are to be included. The concrete usages for foundation and basement works are excluded in CUI computation.

Worked Example 3-1(b)

Proposed residential redevelopment has conserved more than 50% of the façade of the existing building.

Check

Worked Example 3-1(c)(i)

1. Determine if the environmental friendly products selected are certified under SGLS as GreenLabel products.

2. Check if products are used in every dwelling units of the development to be considered as high impact. Products that are meant for common areas and external works such as toilets, lobbies and landscaping areas are considered as low impact.

Example of a proposed residential development with the following provision:

1. Use of GreenLabel waterproofing coating or membrane for all dwelling units’ toilets : 1 point

2. Use of GreenLabel wooden doors for all dwelling units : 1 point

3. Use of GreenLabel roof waterproofing coating for roof : 0.5 point Points scored for 3-1(c)(i) = 1 + 1 + 0.5 = 2.5 points

Worked Example 3-1(c)(ii)

1. Determine if the recycled products used in non-structural elements and have at least 30% recycled content by weight or volume.

2. Check if products are used in every dwelling unit of the development to be considered as high impact. Products that are meant for common areas and external works such as toilets, lobbies and landscaping areas are considered as low impact.

3. For products that are already scored under 3-1(c)(i) are to be excluded.

The same residential development in example 3-1(c)(i) also has the following provision:

1. Use of medium density fibre board that made with 80% recycled materials for all the dwelling units’ wardrobes : 1.0 point

2. Use of floor finishes with recycled rubber (100%) for playground areas : 0.5 point

Points scored for 3-1(c)(ii) = 1.5 point

Therefore, total points scored for 3-1(c) = 2.5 +1.5 = 4 points

Objectives

Encourage greater use of greenery and restoration of existing trees to reduce heat island effect.

Applicability

Applicable to building developments with landscaping areas.

Baseline Standard

-

Requirements

3-2(a)  Up to 4 points can be scored for the provision of greenery within the developments including roof top/ sky garden and green roof.

Greenery Provision (GnP) is calculated by considering the 3D volume covered by plants using the following Green Area Index (GAI) :  Grass GAI = 1 ; Shrubs GAI = 3; Palms Trees GAI = 4; Trees GAI = 6

Greenery Provision (GnP) = total green area / site area GnP = 2.0 to < 3.0 –  1 point

GnP = 3.0 to < 3.5 –  2 points

GnP = 3.5 to < 4.0 –  3 points

GnP ≥ 4.0 –  4 points

3-2(b)  1 point for restoration of trees on site, conserving or relocating of existing trees on site.

3-2(c)  1 point for the use of compost recycled from horticulture waste.

Documentary Evidences

For 3-2(a)

• Plan layouts showing the greenery provision and site areas ; and

• Calculation showing the extent of the greenery provision in the prescribed tabulated format as in worked example 3-2(a).

For 3-2(b)

• Site layouts showing the existing and final locations (where applicable) and number of the trees to be restored or conserved or relocated.

For 3-2(c)

• Extracts of the tender specification showing the requirements to use compost recycled from horticulture waste.

References

-

Description

Qty (A)

Canopy area (B)

Radius (C)

Green Area Index GAI

Green Area (A)x(B)x(C2)xGAI

Trees (Nos)

20

3.14

3.5

6

4615.8

Palms (Nos)

20

3.14

1

4

251.2

Shrubs (m2)

20

NA

NA

3

60

Landscape area + roof garden area + vertical greening (m2)

100

NA

NA

1

100

Total Green Area :

5027

Objectives

Encourage the adoption of environmental friendly practices during construction and building operation.

Applicability

Generally applicable to all building developments.

Baseline Standard

-

Requirements

3-3(a) 1 point can be scored if effective implementation of environmental friendly programmes including monitoring and setting targets to minimise energy use, water use and construction waste are in place.

3-3(b) 1 point can be scored if the building quality is assessed under the Construction Quality Assessment System (CONQUAS) and an additional one (1) point can be scored if the project is assessed under Quality Mark.

3-3(c) Up to 1 point if the developer, main builder, M & E consultant and architect are ISO 14000 certified. 0.25 point is allocated for each firm that is certified.

3-3(d) Up to 3 points where 1 point can be scored if the project team comprises one Certified Green Mark Manager (GMM) and 2 points can be scored if the   team has one Certified Green Mark Professional (GMP).

3-3(e) 1 point can be scored for the provision of building users’ guide including details of the environmental friendly facilities and features within the building and their uses in achieving the intended environment performance during the building operation.

3-3(f) 1 point can be scored for the provision of facilities or recycling bins for collection and storage of different recyclable waste such as paper, glass, plastic etc.

Documentary Evidences

For 3-3(a)

• Extracts of the tender specification showing the requirements for builder to provide and implement environmental friendly programmes to minimise energy use, water use and construction waste; and

• Details of the environmental friendly programmes implemented.

For 3-3(b)

• Extracts of the tender specification showing the requirement to adopt CONQUAS.

For 3-3(c)

• A certified true copy of the ISO 14000 certificate of developer, main contractor, M & E consultant and architect where applicable.

For 3-3(d)

• A certified true copy of the certificate of Green Mark manager and Green Mark professional where applicable and a confirmation of their involvement in the project.

Documentary Evidences

– Cont’d

For 3-3(e)

• A copy of the building users’ guide containing the details of the environmental friendly facilities and features within the building and their uses in achieving the intended environment performance during the building operation.

For 3-3(f)

• Plan layout showing the location of the recycling bins for collection and storage of different recyclable waste.

References

-

Objectives

Promote the use of public transport or bicycles to reduce pollution from individual car use.

Applicability

Generally applicable to all building developments.

Baseline Standard

-

Requirements

3-4(a) 1 point can be scored for design that provides good access (< 500m) to public transport networks such as MRT/LRT stations and bus stops.

3-4(b) 1 point can be scored for the provision of adequate bicycles parking lots.

Documentary Evidences

For 3-4(a)

• Site layout plan in the context of the surrounding area showing the location of the development site and the location of the MRT/LRT stations and bus stops.

For 3-4(b)

• Extracts of the tender specification showing the requirement to provide bicycles parking lots for the development.

References

-

Worked Example 3-4

The main entrance of the residential development is about 200 m away from the nearest bus stop and the provision of bicycle parking lots is specified in the tender drawings and specification

1 point for good access to the bus stop

1 point for the provision of bicycle parking lots Points scored for 3-4 = 2 points

Objectives

Recognise buildings that are designed to consider the potential noise levels within the dwelling units are maintained at an appropriate level.

Applicability

Generally applicable to all building developments.

Baseline Standard

-

Requirements

1 point can be scored if the building is designed to achieve ambient internal noise level as specified :

• 55 dB (6am-10 pm) LeqA

• 45 dB (10 pm-6 am) LeqA

For developments that are in close proximity to road with heavy traffic, flyover or highway, it is necessary to have a detailed analysis conducted by the acoustic consultant. Points can only be scored if the recommendations from the acoustic consultant are implemented.

Documentary Evidences

• Extracts of the tender specification showing the requirement to design the occupied space with the ambient sound levels; and

• A report of the detailed analysis and recommendations from acoustic consultant on how the designed ambient sound levels can be met where applicable.

References

-

Objectives

Minimise airborne contaminants, mainly from inside sources to promote a healthy indoor environment.

Applicability

Generally applicable to all building developments.

Baseline Standard

-

Requirements

4-2(a) 2 points can be scored for the use of low volatile organic compounds (VOC) paints certified under the Singapore Green Labelling Scheme (SGLS) for at least 90% of the internal wall areas.

4-2(b) 1 point can be scored for the use of adhesives certified under the Singapore Green Labelling Scheme (SGLS) in all composite wood products used for the development.

Documentary Evidences

For 4-2(a)

• Extracts of the tender specification showing the requirement to use low VOC paints that are certified under SGLS.

For 4-2(b)

• Extracts of the tender specification showing the requirement to use adhesive with low emission formaldehyde and are certified under SGLS for all composite wood products used.

References

-

Objectives

Minimise airborne contaminants from waste.

Applicability

Generally applicable to all developments.

Baseline Standard

-

Requirements

1 point can be scored if the refuse chutes are located at open ventilation areas such as service balconies or common corridors

Documentary Evidences

• Plan layouts showing the location of the refuse chutes for all typical dwelling units.

References

-

Objectives

Encourage provision of adequate natural ventilation and daylighting in wet areas.

Applicability

Generally applicable to all wet areas such as kitchens, bathrooms and toilets of the developments.

Baseline Standard

-

Requirements

1 point can be scored if there is provision for adequate natural ventilation and daylighting in wet areas i.e. kitchens, bathrooms and toilets.

Extent of coverage : At least 90% of all applicable areas.

Documentary Evidences

• Plan layouts showing the location of the window openings of the kitchens, bathrooms and toilets for all typical dwelling units.

References

-

Objectives

Encourage the use of green features which are innovative and have positive environmental impact on water efficiency, environmental protection and indoor environmental quality of the buildings.

Applicability

Generally applicable to all building developments.

Baseline Standard

-

Requirements

Up to 7 points can be scored for the use of the following green features depending on their potential environmental benefits and the extent of coverage.

Water Efficiency

1. Use of self cleaning façade system :

• 2 points for more than 75% of the external walls

• 1 point for more than 50% of the external walls

• 0.5 points for at least 25% of the external walls

2. Use of integrated basin/cistern pedestal system :

• 2 points for more than 50% of all dwelling units’ flushing cisterns

• 1 point for more than 25% of all dwelling units’ flushing cisterns

• 0.5 point for at least 10% of all dwelling units’ flushing cisterns

3. Use of grey water recycling system :

• 2 points for all blocks of the development.

• 1 point for at least one block of the development.

4. 0.5 point for the use of membrane filtration system to recycle water during construction.

Environmental  Protection

1. Use of precast toilets :

• 2 points for more than 75% of all toilets

• 1 point for more than 50% of all toilets

• 0.5 point for at least 25% of all toilets

2. Provision of green roof and roof top garden :

• 1 point for more than 50% of the roof areas

• 0.5 point for at least 25% of the roof areas.

3. Provision of vertical greening :

• 1 point for more than 50% of the external wall areas

• 0.5 point for at least 25% of the external wall areas

4. 1 point for the provision of double refuse chutes for separating recyclable from non-recyclable waste

5. 0.5 point for the use of non-chemical termite treatment system such as termite baiting system, anti-termite mesh.

6. 0.5 point for the provision of at least 5 nos. of compost bins to recycle organic waste.

7. 0.5 point for the use of non-chemical water treatment system for swimming pools.

8. Up to 1 point if at least 10% of the fine and/or coarse aggregate used for concrete production of structural application are replaced with recycled products from approved sources. 0.5 point for each recycled product used. Points can only be scored if the extent of implementation covers at least 50% of all concrete structural elements of the superstructures (by volume).

Indoor Air Quality

1. Use of Titanium Dioxide solutions to remove odour in toilets :

• 2 points for more than 50% of all toilets

• 1 point for more than 25% of all toilets

• 0.5 point for at least 10% of all toilets

2. 1 point for the use of pneumatic waste collection system.

Others

1. Provision of landscape drainage and infiltration trenches :

• 1 point for at least 25% of the landscape areas

• 0.5 point for less than 25% of the landscape areas

2. Provision of system to recycle surface runoff from the vertical green wall and sky garden :

• 1 point for at least 25% of the green areas

• 0.5 point for less than 25% of the green areas

3. 0.5 point for the use of siphonic rainwater discharge system at roof.

4. 0.5 point for the provision of eco-pond.

Important notes : For features that are not listed above, the QP is required to submit the details showing the positive environmental impacts, possible savings and benefits of the proposed features to BCA for assessment before the submittal of Green Mark Score.

Documentary Evidences

• Extracts of the tender specification showing the provision of the specific green features used and the extent of implementation where applicable;

• Technical product information (including drawings and supporting documents) of the green features;

• A summary sheet listing the breakdown and the extent of implementation as well as the total requirements for the same intended purpose for the specific green features used; and

• Quantified evidences on the potential environmental benefits that the features can bring to the development.

References

-

Objectives

Enhance overall thermal performance of building envelope to minimise heat gain thus reducing the overall cooling load requirement.

Applicability

Applicable to air-conditioned building spaces with aggregate areas > 500 m2.

Baseline Standard

Maximum permissible ETTV = 50 W/m2

ETTV stands for Envelope Thermal Transfer Value.

The computation of ETTV shall be based on the methodology specified in the Code on Envelope Thermal Performance for Buildings issued by BCA.

Requirements

Up to 15 points can be scored for building envelope with better thermal performance than the baseline standard :

2 points for every reduction of 1 W/m2 in ETTV from the baseline. Points scored = 100 – [ 2 x (ETTV)] where ETTV ≤ 50 W/m2

For developments consisting of more than one building, the weighted average of the ETTVs based on the façade areas of these buildings shall be used as the basis for point allocation.

That is

ETTV Weighted = ∑ (ETTVbldg xAbldg) / Adevt

average

where ETTV = ETTV for a building (W/m2)

bldg

Abldg = Summation of all facade areas that enclose all the air-conditioning areas (m2) in a building

Adevt = Summation of total applicable facade areas of all buildings within the development (m2) (i.e. ∑ A )

bldg

Documentary Evidences

• Architectural elevation drawings showing the composition of the different façade or wall systems that are relevant for the computation of ETTV;

• Architectural plan layouts and elevations showing all the air-conditioning areas;

• Extracts of the tender specification or material schedules showing the salient data of the material properties that are to be used for the façade or external wall system; and

• ETTV calculation.

References

Code on Envelope Thermal Performance for Buildings issued by BCA

Objectives

Encourage the use of better efficient air-conditioned equipments to minimise energy consumption.

Applicability

Applicable to air-conditioned building areas where its aggregate air-conditioned areas > 500 m2.

Scope covers all air-conditioned equipments for the buildings as listed:

• Chillers • Air Handling Units (AHUs)

• Chilled water pumps • Fan Coil Units (FCU)

• Condenser water pumps • Unitary Air-Conditioners/ Condensing Units

• Cooling Towers which include single-split units, multi-spilt units and variable refrigerant units (VRV) system

Baseline Standard

Minimum efficiency requirement of the air-conditioning system stated in SS 530 and SS CP 13.

1-2(a)(i) Air-Conditioned Plant

• Chiller - Refer Table 2 of SS 530.

• Chiller and condenser water pump efficiency - Refer to Clause 7.11.6 in CP 13 which states that the water transport factor shall not be less than 30 for chiller water and 40 for the condensing water circuit.

Chilled water pump efficiency ≤ 1kW / (30kW/3.5172) tons

≤ 1kW / 8.53 tons

≤ 0.117 kW/ tons

Condenser water pump efficiency ≤ 1kW / (40kW/3.5172) tons

≤ 1kW / 11.37 tons

≤ 0.088 kW/ tons

• Cooling tower performance at the rating condition stated in Table 3 of SS530. Rating condition is as follows : 35°C Entering water

29°C Leaving water 24°C wb Outdoor air

Propeller and axial fan cooling tower :

With heat rejected from every 3.23 L/s of condenser water per 1 kW of fan power rating :

Cooling tower performance ≤ 1kW / 3.23 L/s

≤ 0.310 kW/ L/s

Centrifugal fan cooling tower :

With heat rejected from every 1.7 L/s of condenser water per 1 kW of fan power rating :

Cooling tower performance ≤ 1kW/1.7 L/s

≤ 0.588 kW/ L/s

1-2(a)(ii) Air Distribution System – Refer to Clause 7.11.5 in CP 13.

1-2(b) Unitary Air-Conditioners/ Condensing Units - Refer Table 1 of SS 530.

Requirements

1-2 (a)(i) Air-Conditioned Plant (Up to 20 points)

1.45 points for every percentage improvement in the efficiency of chiller, chilled-water pump and condenser water pump.

Points scored = 1.45 x (% improvement)

0.05 point for every percentage improvement in the performance of cooling tower at rating condition.

Points scored = 0.05 x (% improvement)

1-2 (a)(ii) Air Distribution System (Up to 5 points)

0.5 points for every percentage improvement in the air distribution system efficiency above the baseline.

Points scored = 0.5 x (% improvement)

Note (1) : For buildings using district cooling system, there is no need to compute the plant efficiency under item (a)(i). The points obtained will be pro-rated based on the air distribution system efficiency under NRB 1-2(a)(ii).

OR

1-2 (b) Unitary Air-Conditioners/Condensing Units (Up to 25 points)

1.5 points for every average percentage improvement in the efficiency of unitary air-conditioners/ condensing units above the baseline.

Points scored = 1.5 x (% improvement)

Note (2) : Where there is a combination of centralised air-con system with unitary air- conditioned system, the computation for the points scored will only be based on the air- conditioning system with a larger aggregate capacity.

1-2 (c) Sensors or similar automatic control devices (2 points)

2 points can be scored if sensors or similar automatic control devices are used to regulate outdoor air flow rate to maintain the concentration of carbon dioxide (CO2) below 1000ppm.

Documentary Evidences

For 1-2 (a) and 1-2(b)

• Detailed calculations of the overall improvement in equipment efficiency of the air-conditioning plants/ units and air distribution system in the prescribed tabulated formats as shown in the worked examples 1-2(a)(i), 1-2(a)(ii), 1-2(b);

• Calculation and technical data of the designed system efficiency of chillers at part load condition ; and

• Technical product information of all air-conditioning units and system.

For 1-2 (c)

• Extracts of the tender specification showing the requirements to incorporate these control devices; and

• Plan layouts showing the locations and the types of control devices used to regulate fresh air intake.

References

(a) SS 530 – Code of Practice for Energy Efficiency Standard for Building Services and Equipment.

(a) SS CP 13 – Code of Practice for Mechanical Ventilation and Air-Conditioning in Buildings.

Equipment Type

Proposed design based on specs (kW/ton)

Design based on code requirements (kW/ton)

Design Code

Chillers (e.g. greater than 300 tons)

0.55

0.577

SS 530

Chilled Water Pumps

0.058

0.117

CP13

Condenser Water Pumps

0.054

0.088

CP13

Total:

0.662

0.782

Equipment Type

Design based on SS 530 (kW/L/s)

Proposed design based on Specs (kW/L/s)

Cooling Tower (eg. axial fan type)

0.31

0.28

Worked Example 1-2(a)(i)

– Cont’d

For Water- Cooled Chillers and Plant

Table 1-2(a)(i)-1 : Equipment Efficiency (Chillers & Pumps)

% Improvement in Equipment Efficiency for Chillers & Pumps = 0.782-0.662  x 100= 15.34%

0.782

Points scored = 1.45 pts x (% improvement) = 1.45 (15.34) = 22.34 points

Table 1-2(a)(i)-2 : Equipment Performance (Cooling Tower)

% Improvement in Equipment Performance for Cooling Tower =  0.31-0.28    x 100

0.31

= 9.68%

Points scored = 0.05 x (% improvement) = 0.05 x 9.68 = 0.48 points

Total points scored for 1-2(a)(i) = 22.24 +0.48 = 22.72 > 20 points (max)

Therefore, points scored 1-2 (a)(i) should be 20 points (max)

Worked Example 1-2(a)(i)

For Air- Cooled Chillers and Plant

Calculation of System Efficiency of Air-Conditioned Plant (using Air-Cooled Chillers)

Background info

Air conditioned area = 81500 m2 Designed total cooling capacity = 500 ton

Based on contract or suppliers’ specification, we have

1. Air-cooled chillers :

1. 3 nos of chillers with identical cooling load of 200 ton

2. Coefficient of Performance (COP) on full load = 3.2 kW/kW

= (1/3.2)(3.5172)= 1.10 kW/ton

2. Chiller water pumps:

1. 3 nos of identical water pumps

2. Water flow rate per pump = 78 L/s

3. Operating static = 16 m

4. Pump efficiency = 85%

5. Motor efficiency = 92%

Power per pump (kW) = (Q)(ρ )(g)(h) where Q=water flow rate in L/s

(106 )(η p )(ηm ) ρ=density of water in kg/m

3

g=gravitational acceleration in m/s2 h=static pressure head m

ηp= pump efficiency

ηm=motor efficiency

Equipment Type

Proposed design based on specs (kW/ton)

Design based on code requirements (kW/ton)

Design Code

Air-Cooled Chillers

1.10

1.13

SS 530

Chilled Water Pumps

0.078

0.117

CP13

Total:

1.178

1.247

Worked Example 1-2(a)(i)

– Cont’d

For Air- Cooled Chillers and Plant

Power per pump (kW) = (78)(1000)(9.81)(16)   = 15.66 kW

(106)(0.85)(0.92)

Total pump (kW) = 15.66 x 3 = 46.98 kW Total cooling capacity = 200 x 3 = 600 ton

The pump performance = 46.98/ 600 = 0.078 kW/ton

Table 1-2(a)(i)-1 : Equipment Efficiency (Chillers & Pumps)

% Improvement in Equipment Efficiency for Chillers & Pumps = 1.247-1.178  x 100 = 5.53 %

1.247

Points scored = 1.45 pts x (% improvement) = 1.45 (5.53) = 8.02 points

Worked Example 1-2(a)(ii)

Calculation of Efficiency for Air Distribution Equipment

Background info

Based on contract or suppliers’ specification, we have

1. AHUs (VAV system):

1. Total fan power consumption = 293.2 kW = 293200 W

2. Total air volume flow rate = 409212 CMH  Equipment efficiency = 293200/409212 = 0.716 W/CMH

2. AHUs (CAV system):

1. Total fan power consumption = 275.2 kW = 275200 W

2. Total air volume flow rate = 678520 CMH  Equipment efficiency = 275200/678520 = 0.406 W/CMH

3. FCUs

1. Total fan power consumption = 411.52 kW = 411520 W

2. Total air volume flow rate = 979805 CMH  Equipment efficiency = 411520/979805 = 0.420 W/CMH

4. Overall required air distribution system efficiency specified under CP13

=    (0.74)(409212)+(0.47)(678520)+(0.47)(979805) = 0.523 W/CMH (409212+678520+979805)

5. Overall required air distribution system efficiency based on suppliers’ specs/contract  specs  =  (293200+275200+411520)/(409212+678520+979805)

= 979920/2067537 W/CMH

= 0.474 W/CMH

Equipment Type

From Specs

Power Required by the motor based on design code CP 13 (W/CMH)

Power Required by the motor at design condition (W/CMH)

Total air flow (CMH)

Total motor power rating (W)

1. AHUs (VAV)

409212

293200

0.74

0.716

2. AHUs (CAV)

678520

275200

0.47

0.406

3. FCUs

979805

411520

0.47

0.420

Total

2067537

979920

0.523

0.474

Block

Floor Level

Area served

Type of Air- Conditioners

Floor Areas (m2)

Design Cooling Capacity

Indoor Unit (kW)

Outdoor Unit (kW)

Blk A

1st Sty

Meeting Room 1

VRV system 1

33

2.8

63.3

Meeting Room 2

27

2.8

Seminar Room (3 nos)

198

14 x 3

Principal’s Office

29.6

4.5

Officer’s Room (4 nos)

12

4x2.8

2nd Sty

Staff Room

VRV system 2

652

5.6 x 14

78.4

Blk B

1st Sty

Computer Lab (4 nos)

VRV system 3

270

7.1 x 6 units

78.6

IT Resource Room

30

9.0 x 4 units

Worked Example 1-2(a)(ii)

– Cont’d

Table 1-2(a)(ii) : Equipment Efficiency (Air-Distribution System)

see working (4) above See working (5) above

% Improvement in Efficiency for Air Distribution Equipment = 0.523-0.474 x 100

0.523

= 9.37%

Points scored = 0.5 x (% improvement) = 0.5 x (9.37) = 4.69 points

Worked Example 1-2(b)

Calculation of Efficiency for Unitary Air Conditioners/Condensing Units

1. Determine the design cooling capacities required for the different block, level and areas served.

2. Determine  the  power  input  required  based  on  design  and  SS  530 requirements.

Table 1-2(b)-1 : Summary of the design cooling capacity requirement

Equipment Type

Design Cooling Capacity (kW)

(a)

Minimum Efficiency based on SS 530

(b)

Design System efficiency from specs

(c)

System Power Input based on SS 530 (kW)

(a)/(b)

Design Power Input (kW)

(a)/(c)

VRV system 1

63.3

2.84 COP

2.91 COP

22.29

21.75

VRV system 2

78.4

2.78 COP

2.89 COP

28.20

27.13

VRV system 3

78.6

2.78 COP

2.89 COP

28.27

27.20

Total Power Input (kW)

78.76

76.08

Objectives

Enhance the overall thermal performance of building envelope to minimise heat gain which would improve indoor thermal comfort and encourage natural ventilation.

Applicability

Applicable to non air-conditioned building spaces with aggregate areas > 10% of the total floor areas excluding carparks.

Baseline Standard

Baseline standard for 1-3(d) - U value for roof :

Weight Group

Weight range (kg/m2)

Maximum Thermal Transmittance (W/m2K)

Light

Under 50

0.8

Medium

50 to 230

1.1

Heavy

Over 230

1.5

Requirements

1-3(a) Up to 10 points can be scored if the building envelope is designed with minimum direct west facing façade by having better building orientation.  Where there is no west facing façade, the points scored will be 24 points and the requirements under 1-3(b)(i), b(ii) and (c) will not be applicable for scoring.

Points scored = 10 – [ 0.2 x (% of west facing facade areas over total façade

areas)]

Note : Orientation of façade that falls within the range of 22.5° N of W and 22.5° S of W will be defined as west facing façade (see illustrations below). Core walls for lifts or staircases and toilets that are located within this range are exempted in computation.

N

N

10 o

West

West facing

facing facade

facade

Illustration 1 Illustration 2

An example of direct west The block is orientated 10°N of W which facing facade is  less  than  of  22.5°  N  of  W.  In  this instance, the façade is defined as ‘west

facing façade’.

N

40 o

Illustration 3

The block is orientated 40°N of W which exceeds 22.5°N of W and hence the façade is not considered as ‘west facing façade’ in the computation.

Types of Sunshading Devices

Angle of Inclination

Desired Shading

30%

40%