Window Glossary Terms
Awning: Window similar to a casement except the sash is hinged at the top and always swings out.
Bay Window: A combination assembly which is composed of two or more individual windows joined side by side and which projects away from the wall on which it is installed.
Bow window: A round bay window that projects from a wall in the shape of an arc.
Casement window: A window containing one or more sash hinged to open from the side, that project outward.
Double-strength glass: Sheet glass between 0.115” and 0.133” (3-3.38 mm.) thick.
Double-hung window: A window unit that has two operable sashes which move vertically in the frame.
Egress window: A window large enough, as defined by local building codes, for exit or entry in case of emergency with little or no effort required. Typically required in bedrooms.
Fixed window: A window designed to be non-operable. Also called a picture window.
Grid (Grids): Wood, plastic or metal dividers (grilles, grids, bars) designed for a single light sash to give the appearance of a divided light sash. These can be removable or fixed.
Grids-Between-Glass: Grids are permanently installed between the panes of the insulating glass.
Hopper window: A typical basement window usually with one sash that projects inward, it is often used below grade.
Impact Resistant Glass: Single or double pane construction made up of laminated glass containing a .090 interlayer.
Obscure Glass: Glass having an image, pattern or texture that distorts the vision through the glass.
Sash: A single assembly of stiles and rails made into a frame for holding glass.
Sash balance: A system of weights, cords and/or coiled springs which assist in raising double-hung sash and tend to keep the sash in any placed position by counterbalancing the weight of the sash.
Sash lock: Generally, a cam-action type lock applied to the check rails of a sliding window to pull the check rails tightly together, both for security and weather tightness.
Simulated Divided Light: Grilles permanently bonded to the interior and exterior of the insulating glass simulating a divided light appearance.
Single-hung: A double-hung type of window in which the top sash is fixed or inoperable.
Tempered Glass: Glass manufactured to withstand greater than normal forces on it surface. It is approximately five times stronger than annealed glass. When it breaks, it shatters into small pieces to reduce hazard. Tempered glass can not be cut after tempering.
Tilt Latch: Used to release the sash and tilt forward for cleaning.
Transom: A small window that fits over the top of a door or window, primarily for additional light and aesthetic value.