(1) crushed stone, crushed slag or water-worn gravel used for surfacing a built-up roof system; (2) any granular material.
A sheet, often granule-surfaced, used as the top ply of some built-up or modified bitumen roof membranes and/or flashings
Water-insoluble, inorganic material, more than 50 percent of which passes through a No. 35 sieve. Used on the surface of various roofing materials and membranes to prevent sticking.
The surfacing layer of bitumen into which surfacing aggregate is embedded on an aggregatesurfaced built-up roof.
(also referred to as mineral or ceramic granule) opaque, natural or synthetically colored aggregate commonly used to surface cap sheets, shingles, and other granule-surfaced roof coverings.
Coarse granular aggregate resulting from the natural erosion of rock.
An aggregate used in lightweight insulating concrete, formed by heating and expanding of a micaceous material.