Gram

A typical coating weight for galvanized metal sheet. Equates to 0.90 oz. (26 g) of zinc per square foot, measured on both sides.

(1) The upper portion of a sidewall that comes to a triangular point at the ridge of a sloping roof; (2) A triangular portion of the end wall of a building directly under the slope roof and above the eave line.

(1) A type of roofing containing sloping planes of the same pitch on each side of the ridge. Contains a gable at each end; (2) A single ridge roof that terminates at gable end(s)..

Gallon

Trade name for a coating, used over metal, that is composed of aluminum zinc for corrosion protection.

An electroylic reaction between dissimilar metals in the presence of an electrolyte.

Steel coated with zinc for corrosion resistance.

A measurement of metal thickness.

A nonwoven or tightly woven fabric used to restrict the flow of the soil particles and other contaminants while allowing water to pass freely through; used for protection to keep drainage systems from clogging.

A type of roof containing two sloping planes of different pitch on each side of the ridge. The lower plane has a steeper slope than the upper. Contains a gable at each end.

(1) Glass fibers bonded into a sheet with resin and suitable for impregnation in the manufacture of bituminous waterproofing materials, roof membranes, and shingle; (2) A sheet composed of bonded glass fibers, suitable for impregnation and coating in the manufacture of bituminous roofing and waterproofing materials and shingles; (3) A felt sheet in which glass fibers are bonded into the felt sheet with resin. They are suitable for impregnation and coating. They are used in the manufacturer and coating of waterproofing of bituminous waterproofing materials, roof membranes and shingles.

(1) A thin mat composed of glass fibers with or without a binder; (2) A thin mat composed of glass fibers, woven or non woven, with or without a binder. This mat may serve as reinforcement for certain roof materials and membranes.

(1) The top layer of asphalt on a smooth-surfaced built up roof membrane; (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. See FLOOD COAT.

Grain

(1) The weight unit equal to 7/7000 lb.; used in measuring atmospheric moisture content; (2) A unit used to measure the mass of moisture.

(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.

(1) Coarse, granular aggregate, containing pieces approximately 5/8" to 1/2" in size and suitable for use in aggregate surfacing on built-up roofs; (2) Coarse, granular aggregate, with pieces larger than sand grains, resulting from the natural erosion or crushing of rock, used as a protective surfacing or ballast on roof systems.

Embedding aggregate surfacing into a built-up bituminous membrane flood coat.

(1) A flanged device, frequently metallic, designed to provide a continuous finished edge for roofing materials and to prevent loose aggregate from washing off the roof; (2) An upward projecting edge along the eaves to stop gravel from rolling or being washed off the roof surface; (3) Flanged device, usually metallic, with vertical projection above the roof level, designed to prevent loose aggregate from rolling or washing off the roof and to provide a finished edge detail for the roof; (4) A low profile upward projecting metal edge flashing with a flange along the roof side, usually formed from sheet or extruded metal, installed along the perimeter of a roof to provide a continuous finished edge for roofing material. It acts a bitumen-stop during mop application of hot bitumen along a perimeter edge.

At a particular site, the level below which the subsoil and rock masses of the earth are fully saturated with water.

(1) A mixture of cement, sand, and water used to fill cracks and cavities in masonry; (2) (Non-shrink): A cementitious material used to fill pitch pans/pockets prior to the application of a pourable sealer.

General Services Commission

(1) The trough that channels water from the eaves to the downspouts; (2) A channeled component installed along the downslope perimeter of a roof to convey runoff water from the roof to the drain leaders or downspouts.