To become gradually narrower or thinner toward one end.
Astragal, T-like in shape, which is rabbeted to the approximate thickness of the swinging door.
Plate glass with increased mechanical strength.
A strip fastened to the floor beneath a door, usually required to cover the joint where two types of floor materials meet.
A small opening above a door separated by a horizontal member (transom bar) and which usually contains a sash or a louver panel hinged to the transom bar; the "transom bar" or "transom" may act as a door frame head jamb for the door opening and as a sill for the transom or may be built-up and separated; "transom" also refers to the "transom bar".
Millwork primarily mouldings and/or trim to finish off (trim around) window and door openings, fireplaces, walls and other members.
Traditionally, the customers of the millwork jobber have been the retail lumber and building materials dealer. This is know as "two-step" distribution.
The rate of heat loss is indicated in terms of the U-value of a window assembly. U-value ratings generally fall between 0.20 and 1.20. The insulating value is indicated by the R-value which is the inverse of the U-value. The lower the U-value, the greater a window's resistance to heat flow and the better its insulating value. See Heat Transmission Coefficient.
A thin sheet or layer of wood, usually rotary cut, sliced or sawn from a log, bolt or flitch.