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
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