Quite a bit of scientific research went into the development of asphalt shingles that can help to reduce cooling costs. Building scientists focused their attention on the tiny mineral granules that come in different colors and are fused to the top surface of asphalt shingles. By applying special coatings to the granules, they discovered that they could increase two critical qualities: reflectivity and emissivity.
New cooler granules reflect about 20% of the sun’s energy, compared to standard dark roof granules that reflect just 3%. Higher emissivity also helps granules stay cooler by shedding heat instead of retaining it.
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