Gable top A gable top is a five-sided geometric shape available in vinyl and aluminum picture window frame bar. Also referred to as a house angle due to the fact that it resembles a house viewed from the side.
	Garage Door A multi-paneled door built in horizontal sections. It slides upward on a metal track, stopping when parallel to the garage ceiling, to allow a car to enter or exit.
	Garden Window A window that projects out from the side of the structure and can be used as a greenhouse for plants. It has a slanted glass roof that allows heat and light from the sun to enter.
	GBG See grilles between the glass.
	Geometric Window Specialty windows of various shapes including: rectangles, triangles, trapezoids, octagons, pentagons, half-rounds, quarter-rounds, full rounds, sectors and ellipses.
	Glass stop The trim that covers the edge of the glass.
	Glazing The process of mounting glass into windows and doors. Glazing also refers to the lowest quality of plate glass. The purpose of glazing is to retain the glass adequately under the design load, provide an effective weather seal, prevent loads or pressure points on the glass resulting from building movement, prevent glass-to-metal contact, and minimize glass breakage from mechanical or thermal stress. An insulating glass (IG) unit is two glass panes separated by a spacer and sealed. IG glass is offered in clear (no special coating) and high performance, which has a special low-emissivity coating for exceptional energy efficiency.
	Gliding Door A door that has one or more panels that slide horizontally; often found in rooms with limited space and where a door opening inward into the room cannot be used. Gliding doors were first put into use at the end of the 19th century. These doors are also referred to as a sliding door.
	Gliding window See horizontal sliding window.
	Glue Chip glass This type of glass features a feathered or frost-like texture and provides an obscured view.
	Gothic lite A gothic lite is a grille pattern available for divided lites.
	Gothic top This refers to a door with a rounded top that comes to a slight point at the center.
	Gotta glass This glass had a pebbled appearance that delivers a very obscured view.
	Grain An arrangement and direction of wood elements or fibers; can be straight or spiral grain; also used loosely to indicate texture.
	Granite glass This glass has a texture that resembles a rough rock surface. With granite glass, the view is completely obscured.
	Green building A movement in architectural building circles, green building is aimed at creating structures that are occupant and environmentally friendly. Criteria such as sustainability, energy efficiency and healthfulness are considered.
	Green strength This is the immediate holding power achieved by a sealant or adhesive.
	Grid see grille
	Grille A decorative grid on the interior or exterior of the glass, between the glass panes, or in any combination of these locations that divides a window opening into smaller openings to create simulated divided lite or true divided lite. Grilles may or may not be removable.
	Grilles between the glass (GBG) A divided lite option for windows and patio doors, these are grilles are placed between the panes of insulating glass. They’re maintenance-free.
	Groove filler This is a filler strip inserted in to the exterior and/or interior mull groove in a vinyl window that creates a flush surface by which the window can be sealed in retrofit applications.
	Guide Bar Operator A window-opening mechanism that has a track along the interior bottom rail of an awning sash. It allows the operating arms to slide as the window opens and closes.
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