Roofing Terminology
(Click on a letter to learn more)
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Glass Fiber Felt
A felt sheet in which glass fibers are bonded into the felt sheen with resin. Glass fiber felts are suitable for impregnation and coating. They are used in the manufacture and coating of bituminous waterproofing material, roof membranes, and shingles.
Glass Fiber Mat
A thin mat composed of glass fibers with or without a binder.
Glaze Coat
The top layer of asphalt in a smooth-surfaced built up roof assembly; a thin protective coating of bitumen applied to the lower plies or top ply of a built up roof membrane when application of additional felts or the flood coat and aggregate surfacing are delayed.
Gravel
Coarse, granular aggregate, containing pieces approximately 5/8 inch to 1/2 inch in size and suitable for use in aggregate on built up roofs.
Gravel Stop
A flange devices, frequently metallic, designed to provide a continuous finished edge for roofing materials and to prevent loose aggregate form washing off of the roof.
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