Although there is no industry-wide definition of a cool roof, the Energy Star Roof Products Program has established a minimum standard, requiring that low-slope roof products have an initial reflectance of at least 65 percent and a reflectance of at least 50 percent after three years of weathering.
The Cool Roof Rating Council (CRRC) is a non-profit association that has established performance ratings for solar reflectance and emittance from roof surfaces. All tests are performed by accredited, independent laboratories and follow established American Society of Testing Materials (ASTM) protocols.
There are three primary types of cool roofing products on the market: protective paints and coatings, green roofs and single-ply roofing systems.
Important factors to consider when selecting a cool roofing system:
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