Walnut This wood species has a color variation from rich, dark brown to black with purple undertones. Walnut also features attractive blonde sapwood streaks within the darker tones, and it generally has a straight grain with occasional waves or curls.
	Warm edge technology This is a method of creating insulated glass using a nonthermal conductive spacer bar.
	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.
	Waterglass This type of glass features a texture that resembles ripples.
	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%.
	Weave glass This textured glass features a grid of embossed squares. It offers a very obscure view.
	Weep Hole The visible exit or entry part of a water drainage system used to drain water out of a window or patio door.
	Weld See fusion weld.
	WEN-Lock™ The WEN-Lock is our exclusive automatic locking system, which is available on our single-hung and slider windows. It features a slim profile that's easy to engage, as well as a tamper-resistant design. In fact, this lock has passed all forced-entry resistance tests. It also has a visible latch indicator (VLI) that lets you know if the window is locked. The VLI can be seen only from indoors. Learn more.
	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).
	Wind load This is the force exerted on a surface by moving air.
	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 and Door Manufacturers Association (WDMA) The Window and Door Manufacturers Association (WDMA) researches, tests and provides certifications for windows and doors.
	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 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.
	Wire-brushed This rustic surface texture for wood doors is achieved by running the wood through a wire brushing wheel (in the direction of the grain). This process tears random width and depth grooves into the wood for a randomly, rough, raised-grain appearance.
	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.
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