A lower interior wall surface (usually 3 to 4 feet above the floor) that contrasts with the wall surface above it; an interior wall composed of two different interior wall surfaces one above the other.

Covers and beautifies plywood's/ wainscot's upper edge or rough sandwich edge in installation where it is exposed to view.

A formulation of chemical which retards the absorption of liquid water and which inhibits decay and stain in wood. It is commonly used on wood window components.

Bark or lack of wood from any cause, except eased edges, on the edge or corner of a piece of lumber.

Any deviation from a true or plane surface, including bow, crook, cup and twist and any combination thereof.  Warp restrictions are based on the average form of warp as it occurs normally, and any variation from this average form, such as short kinks, shall be appraised according to its equivalent effect.  Pieces containing two or more forms shall be appraised according to the combined effect in determining the amount permissible.  Warp may be classified as very light, light, medium, and heavy.

(a)	Bow is a deviation flatwise from a straight line drawn from end to end of a piece.  It is measured at the point of greatest distance from the straight line.  The amount permitted according to the drade is as follows:  If under 2" thick, three times as much as crook permitted for 2" faces.  If 2" thick and under 3", twice as much as crook permitted for 2" faces.  If 3" thick and over, the same as the amount of crook permitted for that thickness.
(b)	Crook is a deviation edgewise from a straight line drawn from end to end of a piece.  It is measured at the point of greatest distance from the straight line.
(c)	Cup is a deviation in the face of a piece from a straight line drawn from edge to edge of a piece.  It is measure at the point of greatest distance from the straight line.
(d)	Twist is a deviation flatwise, or a combination of flatwise and edgewise, in the form of a curl or spiral, and the amount is the distance an edge of a piece a one end is raised above a flat surface against which both edges at the opposite end are resting snugly.

Variously shaped metal, vinyl, plastic or molded fiber strips that fit tightly against the sash 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%.

May be interior or exterior; an exterior window casing is most commonly installed on window frames for wood facing wood frame exterior walls; along with the blind stop, it forms the rabbet for the storm sash or screen.

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

The part of the window frame that surrounds and contacts the window or sash that the frame is intended to support.

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 began being heavily used in the late nineteenth century with advances in glass technology and frame construction. Windows gave building occupants options about views, ventilation, and exterior design.

A combination of the frame, window, weatherstripping, sash activation device and, at the option of the manufacturer, screens and/or storm sash assembled as a complete and properly operating unit.

A wood-based compound utilizing wood fibers, reconstituted wood or other wood derivative. This material is used to make Elite® molded wood fiber interior and exterior doorskins.

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