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Glossary

  For your reference, we have provided definitions of some of the most common window terminology. This section will be helpful if you ever want to contact us with questions or simply want to sound like an expert to your friends.

Glossary of Window Types

Awning Window
A window hinged at the top which opens out in an upward swing.

Bay Window
A bay window is made up of three or more windows. The side or flanker units project out from the building in 30, 45, or 90 degree angles. The center is parallel with building wall and is made up of one or more windows.

Bow Window
A series of four or more adjoining window units, commonly five in number, installed on a radius from the wall of the building.

Casement Window
A window unit in which the sash is hinged on the left or right side and usually opens with a crank-type handle. These windows allow maximum ventilation.

Double-Hung Window
A window unit composed of two operable sash which move vertically past each other in the frame.

Geometric Window
Specialty windows of various shapes including: rectangles, triangles, trapezoids, octagons, pentagons, half-rounds, quarter-rounds, full rounds, sectors and ellipses.

Sliding Patio Door
A door that opens by one panel sliding horizontally past a stationary panel along a track.

Horizontal-Sliding Window
A window unit in which one sash moves (slides) horizontally past a stationary sash in grooves or tracks.

Picture Window
A non-operating window unit. The term "picture window" usually implies a large fixed or stationary unit.


Glossary of Common Window Parts

Brickmould
A form of exterior casing for windows and doors. It serves as a locator point for installation for the unit and provides a boundary for brick or other siding material on the face of the building.

Casing
Interior casing is shaped decorative moulding that covers the inside edges of the jambs and the rough opening between the window unit and the wall. Exterior casing is an alternative to brickmould.

Frame
The outer components of a window unit - side jambs, head jamb and sill (bottom jamb).

Glazing
The insertion of glass into window or door sash.

Grills
Fixed or removable PVC dividers made to simulate divided lites.

Insulating Glass
Dual pane glazing with an enclosed air space between the panes; the space is commonly from 3/16" (5mm) to 3/4" (19mm) wide.

Jamb
The top and two sides of a door or window frame that contact the door or sash.

Lites (Lights)
A pane of glass within a window, often simulated by adding grids or muntin bars.

Rails
The cross or horizontal members of the framework of a sash, door or other panel assembly.

Sash
A single assembly of stiles and rails in a frame for holding glass.

Sidelight
A fixed, often narrow glass window next to a door opening or window.

Weatherstripping
Material or device for sealing openings, gaps or cracks of venting, window and door units.


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