SS Credit 7.1: Heat Island Effect: Non-Roof
1 Point
Intent
Reduce heat islands (thermal gradient differences between developed
and undeveloped areas) to minimize impact
on microclimate and human and wildlife habitat.
Requirements
OPTION 1
Provide any combination of the following strategies for 50% of the
site hardscape (including roads, sidewalks,
courtyards and parking lots):
❑ Shade (within 5 years of occupancy)
❑ Paving materials with a Solar Reflectance Index (SRI) of at least
29
❑ Open grid pavement system
OR
OPTION 2
Place a minimum of 50% of parking spaces under cover (defined as
under ground, under deck, under roof, or
under a building). Any roof used to shade or cover parking must have
an SRI of at least 29.
Potential Technologies & Strategies
Shade constructed surfaces on the site with landscape features and
utilize high-reflectance materials for hardscape.
Consider replacing constructed surfaces (i.e. roof, roads,
sidewalks, etc.) with vegetated surfaces such as vegetated
roofs and open grid paving or specify high-albedo materials to
reduce the heat absorption.
The Solar Reflectance Index (SRI) is a measure of the constructed
surface’s ability to reflect solar heat, as shown by a small
temperature
rise. It is defined so that a standard black (reflectance 0.05,
emittance 0.90) is 0 and a standard white (reflectance 0.80,
emittance
0.90) is 100. To calculate the SRI for a given material, obtain the
reflectance value and emittance value for the material. SRI is
calculated
according to ASTM E 1980-01. Reflectance is measured according to
ASTM E 903, ASTM E 1918, or ASTM C 1549. Emittance
is measured according to ASTM E 408 or ASTM C 1371. Default values
for some materials will be available in the LEED for New
Construction v2.2 Reference Guide.
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