Note: This pilot credit was closed for new registrations as of March 1, 2012.
Heat island effects in cities can increase summertime temperatures by 10 degrees or more, significantly increasing the cooling loads. LEED for Homes has always awarded credit for heat island reduction for both the roof and hardscapes. This is the first time that these two heat reduction measures (both under roof and hardscapes) are combined into a single credit.
Supporting Verification made available by the Project Team:
Excerpted from LEED 2009 for New Construction and Major Renovations
To reduce heat islands such that impacts on microclimates, human and wildlife habitats are minimized.
Ensure that at least 50% of hardscapes (e.g., sidewalks, patios,
driveways, parking lots and roofs) on the project site meet one of the
OPTION 1: Shading
Locate trees or other plantings to provide shading of hardscapes. Shading should be cal-culated for noon on June 21, when the sun is directly overhead, based on five years’ growth.
OPTION 2: Reflective Materials
Install light-colored, high-albedoAlso known as solar reflectance: the fraction of solar energy that is reflected by a surface on a scale of 0 to 1. Black paint has a solar reflectance of 0; white paint (titanium dioxide) has a solar reflectance of 1. The standard technique for its determination uses spectrophotometric measurements, with an integrating sphere to determine the reflectance at each wavelength. The average reflectance is then determined by an averaging process, using a standard solar spectrum, as documented by ASTM Standards E903 and E892. materials or vegetation for hardscapes. Acceptable strategies include the following:
Reflective materials having a lower SRI value than those listed above may be used if the weighted SRI average meets the following criteria:
The homepage for the LEED Pilot Credit Library. The LEED Pilot Credit Library is intended to facilitate the introduction of new prerequisites and credits to LEED. This process will allow USGBC to test and refine credits through LEED 2009 project evaluations before they are sent through the balloting process for introduction into LEED.
Background for the LEED Pilot Credit Library is provided in this foundational document.
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Details on what the LEED pilot credit library is and how to use it.
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