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Cooling energy savings by cool roofs. Savings range from 4% to about 80% in a variety of studies and environments.
ing, smaller air conditioning systems, lower roof maintenance costs and longer roof life. Cool roofs help to meet energy-efficiency goals in building codes and help address a community's heat-island effects. Cool roofs are certified by the Cool Roof Rating Council (CRRC).28 Designers, builders, consultants and owners are showing increasing awareness of how the radiative properties of roofs contribute to buildings' thermal performance. The CRRC recognizes only roofing-product radiative-property tests performed by independent laboratories.
The LEED rating system gives one credit point to cool roofs that cover at least 75% of a roof surface and have a Solar Reflectance Index (SRI) of at least 78 for a low-sloped roof and 29 for a steep-sloped roof. The SRI measures the roof surface's ability to reflect solar heat. A standard white roof (80% reflective) has an SRI of 100, while a standard black roof has an SRI of 0. These criteria closely mirror that for an ENERGY STAR-rated roof. ENERGY STAR-qualified reflective roof products can reduce peak cooling demand by 10% to 15% and can reduce building energy use by up to 50%.29
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