Gable: a triangular portion of the endwall of a building directly under the sloping roof and above the eave line.

 

Gable-Shaped Roof: a single-ridge roof that terminates at gable end(s).

 

Galvalume®: trade name for a coating, used over metal, that is composed of aluminum zinc for corrosionprotection.

 

Galvanic Action: an electroylic reaction between dissimilar metals in the presence of an electrolyte.

 

Galvanize: to coat with zinc.

 

Galvanized Steel: steel coated with zinc for corrosion resistance.

 

Gambrel: a roof that has two pitches on each side.

 

Gauge: a measurement of rating metal thickness.

 

Glass Felt: a sheet composed of bonded glass fibers, suitable for impregnation and coating in the manufacture of bituminous roofing and waterproofing materials, and shingles.

 

Glass Mat: 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.

 

Glaze Coat: (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. (Also see Flood Coat.)

 

Granule: (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.

 

Gravel: aggregate resulting from the natural erosion of rock.

 

Gravel Stop: 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. Acts as a bitumen-stop during mop application of hot bitumen along a perimeter edge.

 

Gutter: a channeled component installed along the downslope perimeter of a roof to convey runoff water from the roof to the drain leaders or downspouts.

 

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