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G-90
a designation for galvanized metal sheet, indicating 0.90 ounces (26 g) of zinc per square foot, measured on both sides.

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

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

Gable
the vertical triangular portion of the end of a building having a double-sloping roof, from the level of the eaves to the ridge of the roof.

Galvalume
trade name for a metal alloy coating that is composed of aluminum, zinc and silicone.

Galvanic action
an electrochemical action that generates electrical current between two metals of dissimilar electrode potential.

Galvanic series
an list of metals and alloys arranged according to their relative electrolytic potentials in a given environment.

Galvanize
to coat steel or iorn with zinc.

Galvanized steel
steel coated with zinc for corrosion resistance.

Gambrel
a roof that has two pitches on each side, where the upper roof area has less slope than the lower roof areas.

Gauge
a metal thickness measurement.

Geocomposite
a prefabricated water drainage material used to relieve hydrostatic pressure against waterproofing and promote drainage.

Geodesic Dome
a rounded structure made of short, straight, triangular sections that form polygons.

Geotextile
a tightly woven fabric used to restrict the flow of fine soil particles and other contaminants while allowing water to pass freely through; used to protect drainage systems from clogging.

Girt
a horizontal beam that supports wall cladding between columns.

Glass felt
glass fibers bonded into a sheet with resin and suitable for impregnation with asphalt in the manufacture of bituminous waterproofing, roofing membranes and shingles.

Glass fiber insulation
blanket or rigid board insulation, composed of glass fibers bound together with a binder, faced or unfaced, used to insulate roofs and walls.

Glass mat
a thin mat of glass fibers with or without a binder.

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.)

Gloss
the shine, sheen, or luster of a dried film.

Grain
a unit used to measure in the English System of units; 7,000 grains equals 1 lb.; used as a measure of the weight of moisture in air.

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 stop
a flanged device, frequently metallic, designed to prevent loose aggregate from washing off the roof and to provide a continuous finished edge for the roofing.

Gravel
coarse granular aggregate resulting from the natural erosion of rock.

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

Grout (Non-Shrink)
a cementitious material used to fill pitch-pans/pockets, prior to the application of a pourable sealer.

Grout
a mixture of cement, sand, and water used to fill cracks and cavities in masonry.

Gusset
used at the bottom of a steep-slope roof system valley, a large flat metal piece(s) wider than the valley to help prevent build-up at the base of the valley, either from debris or ice dam formations.

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.

Gypsum board panels
cementititious board stock with noncombustible core primarily comprised of gypsum that is commonly used as a barrier board thermal barrier or cover board in a roof assembly.