Ceramic-coated colored crushed rock that is applied to the exposed surface of asphalt roofing products. IKO makes its own granules at our Madoc, Ontario, and Ashcroft, British Columbia granule plants. Granules protect the asphalt coating from the sun's rays, add color to the product and enhance fire resistance.
(1) Opaque, natural, or synthetically colored aggregate commonly used to surface cap sheets, shingles, and other granule surfaced roof coverings; (2) Natural or synthetic aggregate particles, ranging in size from 500 um (1 um = 10-6 m) to 1/4" diameter, used to surface cap sheets, asphalt shingles, and some cold-process membranes; (3) Ceramic-coated colored crushed rock that is applied to the exposed surface of asphalt roofing products. Also referred to as Mineral or Ceramic Granule. See MINERAL GRANULES.