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SOLAR-REFLECTIVE ROOFING GRANULES, ROOFING PRODUCTS INCLUDING THEM, AND METHODS FOR MAKING THEM

  • US 20190323240A1
  • Filed: 03/26/2019
  • Published: 10/24/2019
  • Est. Priority Date: 03/31/2018
  • Status: Active Grant
First Claim
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1. A collection of solar-reflective roofing granules having a solar reflectivity of at least 70%, wherein substantially each roofing granule comprises an inner layer, an outer layer disposed on an outer surface of the inner layer and substantially surrounding the inner layer, wherein the inner layer and the outer layer are formed from substantially the same composition but have substantially different porosities, the outer layer having a porosity substantially lower than the porosity of the inner layer.

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