Glossary - W

A Glossary of window terminology

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Windload

The pressure, positive or negative, acting on an external surface of a building caused by the direct action of the wind. 

Warm-edge technology
The use of low-conductance spacers to reduce heat transfer near the edge of insulated glazing.

Weep Holes
Openings cut into siding or accessories to allow for water runoff.

Warp
A condition that exists when an object is twisted out of shape.  

Water-Repellent Preservatives
A formulation of chemical which retards the absorption of liquid water and which inhibits decay and stain in wood. It is commonly used on exterior wood components.  

Weatherstrip
Variously shaped metal, vinyl, plastic or molded fiber strips that fit tightly against the window or door frame parts to prevent air infiltration through cracks. Cold air entering the house in winter can account for up to 35% of the heating load. Weatherstripping can reduce the load to 20%.   

Wet-Glaze
The method by which glass is set and sealed into a sash or window opening with a semiliquid compound usually clear in color (sealant).  

Window Casing
May be interior or exterior; an exterior window casing is most commonly installed on window frames for wood sided exterior walls.  

Window Frame
A group of wood parts machined and assembled to form an enclosure and support for a sash.  

Window Jamb
The upper horizontal and vertical frame members that house the window sash. Jambs may be classified as head or side jambs.  

Window
A wall opening in a building added for the purpose of letting in light and air, usually sealed from the elements in some way, using a frame and sash containing glass or another type of transparent material, and usually able to be opened and shut. Windows containing glass bega.  

Window Unit
A combination of the frame, sash, weatherstripping, sash opening mechanism and, at the option of the manufacturer, screens and/or storm sash assembled as a complete and properly operating unit.  

Wood Composite
A wood-based compound utilizing wood fibers, reconstituted wood or other wood derivative.  

Wood Operator Cover Trim
A wood trim which conceals the operating hardware on a wood casement or awning window.