Green Roof

Presented by:Thirukumaran Jallendran,

Board Member, MGBCProject Manager, Lend Lease

Green in the context of the and

World CO2 Concentrations Over The Years

Source: UNEP/GRID Arendal

Source: Climatic Research Unit

World Average Temperatures in Recorded History

The Hottest Decade: Jan 2000 to Dec 2009

Source: NASA’S Goddard Institute for Space Studies(GISS)

Real Estate Sector’s Global ImpactReal Estate Sector’s Global Impact

Growth of Cities

Image Source: NASA Earth Observatory

TEHRAN, 1985TEHRAN, 1985

TEHRAN, 2009TEHRAN, 2009

Urban – Rural Population of the World

Source: The United Nations

City Impacts

Credit: C. Mayhew & R. Simmon (NASA/GSFC), NOAA/ NGDC, DMSP Digital Archive

WHY THE NEED FOR A MALAYSIAN GREENRATING TOOL ?

WHY THE NEED FOR A MALAYSIAN GREENRATING TOOL ?

GBI NON RESIDENTIAL TOOL

Total = 16 Points

GBI NON RESIDENTIAL TOOL

GBI RESIDENTIAL TOOL

Total = 39 Points

GBI RESIDENTIAL TOOL

GBI RESIDENTIAL TOOL

Total = 18 Points

GBI RESIDENTIAL TOOL

SM 4 – Environment Management(Non-residential New Construction & Industrial New Construction)

SM 4 – Open Spaces, Landscaping and Heat Island Effect(Residential New Construction)

URBAN HEAT ISLAND EFFECT

• UHI Effect is defined bythe Thermal gradientdifference betweendeveloped andundeveloped areas

• Heat Island must bereduced to minimizeimpact on microclimateand human as well aswildlife habitats

T = 39 – 25 = 14C

SITE PLANNING & MICRO-CLIMATE

T = 32 – 25 = 7C

SITE PLANNING & MICRO-CLIMATE

Urban Heat Island – Impact of Vegetation

URBAN ROOF LANDSCAPING – Surface Temperatures

Storm water Design – Quantity & Quality Control- Non-residential New Construction – SM 11- Industrial New Construction – SM 13- Residential New Construction – SM 6 (Storm Water Management)

INTENT

• Limit disruption of natural hydrology by reducing impervious cover,increasing on-site infiltration, and managing storm water runoff.

REQUIREMENTS

If existing imperviousness is ≤ 50%: (In other words, if the existing site is > 50% pervious)– Implement a storm water management plan that prevents the post development peak

discharge rate and quantity from exceeding the pre-development peak discharge rateand quantity in conformance to the Storm Water Management Manual for Malaysia(MASMA)

If existing imperviousness > 50%: (In other words, if the existing site is ≤ 50% pervious)– Implement a storm water management plan that results in a 25% decrease in the

volume of storm water runoff required under MASMATotal = 1 Point

For either Condition, implement a storm water management plan that reduces imperviouscover, promotes infiltration, and captures and treats the storm water runoff from 90% ofthe average annual rainfall using acceptable best management practices (BMPs)

Storm Water Management

Water balance at a Developed and Undeveloped Site – (Schueler, 1987)

Smaller building footprint

Pervious paving materials

Storm water harvesting for reuse in irrigation and/or buildings

Green roofGreen roof

Bio-swales/ vegetated filter strips

Retention ponds

Clustering development to reduce paved surfaces (roads, sidewalks, etc.)

Reduction in impervious area will minimize storm water runoff volume. Byreducing impervious area, storm water infrastructure can be minimized ordeleted from the project. Strategies to minimize or mitigate impervious surfacesmay include:

Storm Water Management - Strategies

Green roof

INTENT• Reduce heat island (Thermal gradient difference between developed

and undeveloped areas) to minimize impact on microclimate andhuman as well as wildlife habitats

REQUIREMENTS

A. Hardscape & Greenery Application (1 point)

B. Roof Application (1 point)

Total = 2 Points

Greenery & Roof- Non-residential New Construction – SM12- Industrial New Construction – SM 13

Greenery & Roof- Non-residential New Construction – SM12- Industrial New Construction – SM 13

Roof Type Slope SRI

Low Sloped < 2:12 78

Steep Sloped > 2:12 29

REQUIREMENTS

B. Roof Application (1 point)1) Use roofing material with a Solar Reflectance Index (SRI) equal to

or greater than the value in the table below for a minimum of 75%of the roof surface;OR

2) Install a vegetated roof for at least 50% of the roof area;OR

3) Install high albedo and vegetated roof surfaces that, incombination, meet the following criteria:(Area of SRI Roof / 0.75) + (Area of vegetated roof / 0.5) ≥ Total Roof Area

Reduce impervious hardscape

Use open grid pavement systems

Facilitate increased evaporationfrom open cell vegetation.

Use light coloured paving surfaces

shade paved areas withlandscaping

Select appropriate ground cover

Roof Gardens

Urban Heat Island Effect – Strategies to Mitigate

Roof Gardens

Sustainable Landscaping Principles

Plant low-water ground covers or drought-tolerant grass and use absorbentsoil mixtures to promote storm water infiltration and reduce additionalcosts related to managing storm water.

Design so that site work lessens soil compaction and precludesunnecessary soil compaction while construction is on-going.

Reduce energy use by designing sites that do not require energy intensivemaintenance to remain healthy and attractive, and by minimizing shippingdistances for materials and supplies.

Maximize ecological value by enhancing ecological functions and services.

Green Roof

Green Roof

Green Roof

Green Roof - Roof Gardens

Green Roof – The Singaporeexperience

Green Roof – The Singaporeexperience

Green Roof

Green Roof

THANK YOU