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Term Definition

Uppermost portion of the end wall of a building that comes to a triangular point under a sloping roof.


The wearing or abrading of one material against another under extreme pressure.

Galvanic Corrosion

Corrosion that develops by galvanic action when two dissimilar metals are in contact in the atmosphere.

Gearless Traction Elevator

An elevator with the traction sheave connected to a spur gear that is driven by a worm gear connected to the shaft of the electric motor.


Beam, especially a long, heavy one; the main beam supporting floor joists or other smaller beams.


An inorganic mixture that has been fused at a high temperature and cooled without crystallization.

Glazed Structural Clay Tile

Hollow clay tile products with glazed faces typically used to build interior walls.

Glue Laminated Lumber (Glulam)

A structural wood member made by bonding together laminations of dimension lumber.


Bonding agents made from animal and vegetable products.


1. Related to soil, the elevation or slope of the ground.

2. In relation to lumber, a means of classifying lumber or other wood products based on specified quality characteristics.

Grade Beam

A ground-level reinforced structural member that supports the exterior wall of a structure and bears directly upon columns or piers.

Grade Level

The elevation of the soil at a specific location.

Grade Mark

A stamp on a product, such as wood, plywood, or steel, indicating the product's capacity.


The rate of slope between two points on a surface, determined by dividing their difference in elevation by their distance apart.


Adjusting the level of the ground on a site.


The modification of earth to create landforms.


Hard rock material in particles larger than 1/4 inch (6.4 mm) in diameter but smaller than 3 inches (76 mm).

Green Lumber

Lumber having a moisture content more than 19 percent.


A belt-like area around a city, reserved by ordinance for parkland, farms, open space, etc.

Greenhouse Effect

The direct gain of solar heat, generally through south-facing glass walls and roofs.


An open gate used to cover, conceal, protect, or decorate an opening.


A conducting connection between an electrical circuit and the earth or a conducting body that serves in place of the earth.

Ground-Fault Circuit Interrupter

A device providing protection from electric shock by de-energizing a circuit within an established period of time when the current to ground exceeds a predetermined value that is less than that needed to activate a standard overcurrent protective device.


Water that exists below the surface of the earth and passes through the subsoil.

Groundwater Level

The plane below which the soil is saturated with water. Also called Groundwater Table or Water Table.


A viscous mixture of Portland cement, water, and aggregate used to fill cavities in concrete. Also refers to a specially formulated mortar used to fill under the baseplates of steel columns and in connection in precast concrete.


Wood or metal plate riveted, bolted, glued or pressed (wood trusses) over joints to transfer stresses between connected members.


Hydrous calcium sulfate.

Gypsum Backerboard

A gypsum panel used as the base on which to bond tile or gypsum wallboard.

Gypsum Board

A gypsum panel used as the base on which to bond tile or gypsum wallboard.

Gypsum Lath

A panel having a gypsum core and a paper covering providing a bonding surface for plaster.

Gypsum Plaster

Ground gypsum that has been calcined and mixed with additives to control setting time and working qualities.

Gypsum Sheathing

A gypsum panel with a water-repellent core. Used for sheathing exterior walls.

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