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Low Giau LeongCentre for Sustainable Buildings & Construction

Going green with Sustainable Construction via Green Mark

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Greenhouse Effect…

Global Environmental Impact and Challenge

40% Global Energy

1/3 Greenhouse Gas Emission

•Buildings will be taller, built faster and with lesser materials and more sustainable materials…•Prefabricated modular construction eg. Prefabricated Prefinished Volumetric Construction (PPVC)

Building & Construction trends

Composite Construction

Tamedia office building, Zurich built in 2013

• Seven sty bldg, main structural system is

entirely made of timber

• Components: CNC-cut

BCA Green Mark 2015For New Buildings (Non Residential)

Green Mark 2015

Green Mark Score Green Mark Rating

70 and above Green Mark Platinum

60 to < 70 Green Mark GoldPLUS

50 to < 60 Green Mark Gold

Green Mark Certified is equivalent to the BCA Regulation

for Environmental Sustainability

Green Mark has been extensively restructured:

• 4 sustainability outcomes

• 5 Scored Sections

• 16 Green Mark Criteria

• 79 Sustainability Indicators

• 120 Points + Advanced Green Efforts

For Green Mark 2015 in Singapore –

only 3 ratings for awards as Certified

is a regulatory requirement. These 3

levels represent Good Practice,

Better Practice and Best (Global

leading) Practice

Climate Responsiveness Conservation of Ecological Systems

Resource Stewardship Health and Wellbeing

Green Mark 2015

4 OUTCOMES

OF GREEN MARK 2015

5 Sections

Climatic Responsiveness

Building Energy Performance

Resource Stewardship

Smart & Healthy

Buildings

Advanced Green Efforts

The New Structure of GM 2015:

Outcomes of Green Mark 2015

Resource Stewardship

Reduction of Environmental footprint

(Design & As-Built)

Building Life cycle consideration

Effective management (energy, water,

waste)

Choice of construction materials, methods

Embodied carbon

1.01d - BIM

3D Lonely BIM

(Regulation)

3D Integrated

BIM

4D (Time) BIM

•Linking attributes to the construction programme

5D (Cost) BIM

•Specifications and quantity schedules

6D (FM) BIM

• data for maintenance and repairs

•Building performance analytics

BIM for DfMA

BIM for Design Co-

ordination

BIM for Performance Based

Simulation

Advanced Green Efforts (Enhanced Performance)

CRITERIA FOR SUSTAINABLE

CONSTRUCTION & CARBON

UNDER GM 2015

3.Resource Stewardship

Water

(8 points)

Materials

(18 points)

Waste

(4 points)

Green Mark 2015Resource Stewardship

Carbon Computation

Sustainable Construction

Alternative construction

methods

Waste

Sustainable Products

Green labelled products

Recycling system for common recyclables or

horticultural waste

3.00 Resource Stewardship:

S/N Criteria Pts

3.01 Water Efficient Building:(a)Water fittings (better than WEB certification which is

a pre-requisite)(b)Water monitoring and leak detection(c) Water saving strategies

3.02 Material Impacts:a) Sustainable Construction (includes alternative

structures, concrete reducing techniques,RCA/WCS/GBBS/CUI etc)

b) Embodied Energy and Life Cycle (online material calculator)

c) Sustainable Products (SGBC/SGLS)

3.03 Operational waste managementa) Provision of recycling facilitiesb) Provision of food waste collection facilitiesc) Compost & horticultural or wood waste

Sustainable Construction (SC) Design for resource-efficiency and low-carbon

3R Carbon Accounting+

Reduce

Recycle

Reuse

Summary of Proposed Changes in GM 2015

GM V4.1 GM 2015

SC Pre-requisite for Gold+ and Platinum projects

• Extend SC pre-requisite to Gold projects• Additional requirement for Gold+ and

Platinum to score pre-requisite pts from Carbon Accounting

Part 3-1(b). • CUI entry level 0.70

Part 3.02a(i). Resource-Efficient Design(‘Reduce’)• CUI entry level to be lowered to 0.60• Bonus pts for using buildable &

constructible systems• BIM add-on tool to compute CUI

Part 5.1 (xii)Adoption of Demolition Protocol• 1 pt for recovery rate of >20%

crushed concrete waste • 2 pts for recovery rate of >35%

Part 3.02a(ii). Resource Recovery (‘Reuse’)• Adoption of Demolition Protocol

• 1 pt for recovery rate of >35% crushed concrete waste

• Environmental friendly best practices

GM V4.1 GM 2015

Part 3-1(a)(i)• 1 pt for using 10% green

cements

Part 3-1(a)(ii).• Pts given for tonnage of

RCA/WCS used based on extentof min. requirement (Min. requirement= 0.03 X GFA)

Part 3.02a(iii). Sustainable Resource Usage (‘Recycle’)• 1 pt for using 20% green cements(max clinker content ≤ 400 kg/m3 for

grades up to C50/60.)

• Pts given for % RCA/WCS used. Max pts for 10% aggs replacement based on GFA (Min. requirement= 1.5% GFA/2)

Part 5-1 (x).• Up to 1pt for computing carbon

footprint of 11 major building construction materials or a complete carbon footprint report of the development prepared by an independent carbon consultant

Part 3.02b. Embodied Energy and Life Cycle• Pts given for computing the

embodied carbon footprint of building construction materials or for the whole development.

• Online carbon calculator to aid computation

GREEN MARK 2015

Part 3.02a

Sustainable Construction

Sustainable Construction (SC)BIM Add-on Tool Development Project to Auto-Compute CUI

Concrete Usage Index (CUI) = Concrete Volume in m3

Constructed Floor Area in m2

Details of Proposed Criteria

Current Proposed Amendment

Part 3-1(b). Concrete

Usage Index (CUI)

• Up to 5 pts for

CUI• Pre-requisite

Gold+: ≥3 ptsPlatinum: ≥5pts

Part 3.02a Sustainable Construction

(i). Resource-Efficient Design (‘Reduce’)

• Pts for tiered CUI performance without

affecting structural safety• Pre-requisite

• Gold: 0.5 pt from Part 3.02a (i). • Gold+: ≥1.5 pts from Part 3.02(a). • Platinum: ≥3pts from Part 3.02(a)

•Sustainable alternatives:

•Prestressed Concrete Elements

•Hollow Core or Voided Concrete Elements

•Light Weight Concrete Elements

• *High Strength Concrete Elements

•Structural Steel Elements

•Composite Structural Elements

•Cross Laminated Timber (CLT)

•Prefabricated Prefinished Volumetric Construction

•Others

Enhancement to recognise buildable, constructible systems that are SC-friendly

*Refers to concrete grade >60MPa

Details of Proposed Criteria

Proposed Amendment

• Bonus Point scored = Weightage

based on project CUI x Adoption rate

of sustainable alternatives (based on

≥10% structural elements used)

• For Gold+/ Platinum- additional pts

can be obtained from Parts (ii)

Resource Recovery or (iii)

Sustainable Resource Usage

Details of Proposed CriteriaCurrent Proposed Amendment

Part 5.1 Other Green Features

Environment Protection

(xii) Adoption of Demolition

Protocol to maximise resource

recovery of demolition materials

for reuse or recycling 2 pts for recovery rate of >35%

crushed concrete waste sent to

approved recyclers with proper

facilities

1 pt for recovery rate ≥20% crushed

concrete waste sent to approved

recyclers with proper facilities

Part 3.02a (ii) Resource Recovery (‘Reuse’)

• Enhanced Demolition Protocol to

maximise resource recovery of

demolition materials for reuse or

recycling 1 pt for recovery rate of >35% crushed

concrete waste sent to approved recyclers

with proper facilities

• Effective implementation of

environmental friendly programmes/

best practices at construction sites Pts for setting targets, recording and

monitoring to reuse building and

construction resources eg. water,

construction waste etc

Details of Proposed Criteria

Current Proposed AmendmentPart 3-1(a). Use of

Sustainable and

Recycled Materials

(i). 1 pt for to replace

Ordinary Portland

Cement (OPC) by

at least 10% by mass

for superstructural

works.

Part 3.02a (iii). Sustainable Resource

Usage (‘Recycle’)

Pts given for use of environmentally-

friendly/ green construction materials.

This includes:

• Up to 1 pt to replace *OPC by 20% by

mass for all superstructural works.

*Max clinker content ≤400 kg/m3 for grades up to C50/60.

The concrete mix should be designed with provisions for

increased risk of drying shrinkage cracks in thin sections,

early thermal cracking or damage due to alkali silica

reactions and delayed ettringite formation.

Current Proposed Amendment

Part 3-1(a). Use of

Sustainable and

Recycled Materials

(ii). Up to 4 pts for

RCA/WCS (tons) used

Part 3.02a (iii). Sustainable Resource

Usage (‘Recycle’)

• Max pts for using % RCA/WCS

used

Min. usage requirement= 0.03 X GFA

Quantity of RCA / WCS Points allocation

≥ 0.5x minimum usage requirement 1 point

≥ 1x minimum usage requirement 2 points

≥ 1.5x minimum usage requirement 3 points

≥ 2x minimum usage requirements 4 points

Details of Proposed Criteria

GREEN MARK 2015

Part 3.02b

Embodied Energy and Life Cycle

• Develop local carbon inventory (web-based)

• Track performance of local building projects in terms of embodied carbon footprint equivalent (CO2eq).

• Improve and reduce embodied carbon footprint in the local building sector.

BCA’s Carbon Calculator

Current Proposed Amendment

Part 5-1. Green Features

and Innovations

• Up to 1pt for

computing carbon

footprint of 11 major

building construction

materials

• Or a complete carbon

footprint report of the

development

prepared by an

independent carbon

consultant

Part 3.02(b) Embodied Energy and Life Cycle

Gold+ and Platinum to score pre-requisite pts from

compulsory materials

Details of Proposed Criteria

Conclusion

BIM Design tools to compute CUI, carbon footprint etc

Low-carbon Building Strategies

Aim: Higher adoption & appropriate use of low-carbon, low-concrete, sustainable and productive materials/ products/ systems

Cobiax Technology

Sustainable Building and Construction

The Way Forward

We shape a safe, high quality, sustainable and friendly built environment.

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