Glossary of Commercial Roofing Terms
Click on a letter, to view the terms below.
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Fishmouth: Membrane defect consisting of an opening in the edge lap of a felt in a built up membrance; a consequence of an edge wrinkle.
Flashing: components used to weatherproof or seal the roof system edges at the perimeters, penetrations, walls and other places where the roof covering is interrupted or terminated.
Flashing Cement: a trowelable mixture of cutback bitumen and mineral stabilizers, including asbestos or other inorganic fibers.
Flat Asphalt: a roofing asphalt that has a softening point of approximately 170F (77C) and that conforms to the requirements of ASTM Standard D 312, Type II.
Flood Coat: the top layer of bitumen into which the aggregate is embedded on an aggregate-surfaced built up roof.
Fluid Applied Elastomer: as elastomeric material, which is fluid at ambient temperature, that dries or cures after application to form a continuous membrane.
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: (1) the top layer of asphalt in a smooth-surfaced built up roof assembly; (2) 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.
Heat Welding: method of melting or fusing together the overlapping edges of separate sheets of thermoplastics and polymer modified bitumens.
Headlap: the minimum distance, measured at 90 degrees to the eaves along the face of a shingle or felt, form the upper edge of the shingle or felt to the nearest exposed surface.
Holiday: an area where a liquid applied material is missing.
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