Gable      Triangular upper portion of a wall at the end of a pitched roof
Gable roof     A type of roof with sloping planes of the same pitch on each side of the ridge. Has a gable at each end.
Gallery      Long porch across a facade
Gambrel roof      A pitched roof with two slopes on each side
General contractor    The party responsible for the execution, supervision and overall coordination of a project and may also perform some of the individual construction tasks. Most general contractors are not licensed to perform all specialty trades and must hire specialty contractors for such tasks, e.g. electrical, plumbing.
GFI or GFCI or Ground Fault Circuit Interrupter     A electrical device used to prevent injury from contact with electrical appliances. Required in new homes in: bathrooms, kitchen, garage, out of doors and in other locations where one might be in contact with a grounded surface and an electrical appliance. Most GFIs are located in the receptacle itself and can be identified by the presence of a 'test' and a 'reset' button.
Gingerbread      Decorative wooden trim
Glass-base      Roll roofing product built on a fiberglass base sheet constructed with a heavyweight TAMKO fiberglass mat, coated with weathering-grade asphalt. Used as a base sheet in select TAMKO modified asphalt and fiberglass roofing systems and as an alternate for TAMKO Type 43 Coated Base Sheet in any TAMKO specification. Hot-asphalt applied or mechanically fastened.
Glass-seal     3-tab self-sealing fiberglass shingles with a traditional square-tab design. A thick layer of weathering-grade asphalt gives them extra waterproofing protection. They are U.L. Class A fire rated and backed by a 20-year limited warranty. Algae-resistant granules optional.
Gothic     head window: A window topped with a pointed arch. Also called Gothic-top window. It is not as tall and narrow as the pure Gothic window. Commonly seen in Victorian Gothic revival style architecture.
Grade      The ground level around a building.
Grading    The process of moving earth to achieve a desired ground level and/or slope.
Grading permit     - authorization to change the contour of the land.
Grain      The direction, size, arrangement, appearance or quality of the fibers in wood.
Granules      Crushed rock coated with ceramic material, applied to the exposed surface of asphalt roofing products to add color and reduce ultraviolet degradation. Copper compounds added to these help make them algae resistant.
Grout      Mortar made of such consistency (by adding water) that it will flow into the joints and cavities of masonry work and fill them solid.
Gutter    The trough that channels water from the eaves to the downspouts.