G90
A typical coating weight for galvanized metal sheet. Equates to 0.90 oz. (26g) of zinc
per square foot, measured in both front and back surfaces. Other coating weights are
G30 and G60.
Gable
The triangular portion of the endwall from the level of the eave to the ridge of the roof.
Gable Overhang
See "End Wall Overhang".
Gable Roof
A roof consisting of two sloping sides that form a ridge and a gable at each end.
Gage
The distance between adjacent lines of fasteners along which pitch is measured, or the
distance from the back of an angle or other shape to the first line of fasteners.
Galvalume®
A proprietary trade name for a coating, used over sheet steel, that is composed of an
aluminum-zinc alloy for corrosion protection.
Galvanized
Steel coated with zinc for corrosion resistance.
Galvanic Action
An electrochemical reaction between dissimilar metals in the presence of an
electrolyte.
Galvanic Series
Magnesium ACTIVE
Zinc
Cadmium
Aluminum 2017
Steel (plain)
ANODIC Cast iron
Lead
Tin
Brasses
Copper
Bronzes
CATHODIC Titanium
Monel
Nickel
Nickel (passive)
304 Stainless Steel (passive)
316 Stainless Steel (passive)
Silver
Graphite NOBLE
Gantry Crane
A crane similar to an overhead crane except that the bridge for carrying the trolley or
trolleys is rigidly supported on one or more legs running on fixed rails or other runway.
Gauge
The thickness of sheet metal. Further defined in Section A14 of this manual.
Girder
A main horizontal or near horizontal structural member that supports vertical loads. It
may consist of several pieces.
Girt
A horizontal structural member that is attached to sidewall or endwall columns and
supports paneling.
Glare
The reflection of sunlight that can impair vision and create an annoyance. Glare of a
coated surface is controlled by the sheen. Low Sheen = Low Glare.
Glaze
The process of installing glass in windows and doors.
Glazing
Glass panes or paneling used in windows and doors.
Grade
The term used when referring to the ground elevation around a building.
Grade Beam
A concrete beam around the perimeter of a building.
Ground Snow Load
The probable weight of snow on the ground for a specified recurrence interval
exclusive of drifts or sliding snow.
Grout
A mixture of cement, sand and water used to fill cracks and cavities. Sometimes used
under base plates or leveling plates to obtain uniform bearing surfaces.
Gusset Plate
A steel plate used to reinforce or connect structural elements.
Gutter
A light gauge metal member at an eave, valley or parapet designed to carry water from
the roof to downspouts or drains.