Term Description
Fine mineral surfacing

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.
Surfacing

(1) The top layer or layers of a roof covering specified or designed to protect the underlying roofing from direct exposure to the weather; (2) the wearing or top layer of a traffic-bearing waterproofing membrane.