Pitch (roof) - The slope of a roof expressed in feet rise per foot of run.

Slope - The incline angle of a roof surface, given as a ratio of the rise (in inches) to the run (in feet). See also pitch.

Spandrel - The space between two openings which are one above the other in a wall.

Crown - Most boards have a slight bow to one edge. The high side of the bow is called the crown or crown edge.

By fold door - Doors that are hinged in the middle for opening in a smaller area than standard swing doors. Often used for closet doors.

Batt - A section of fiber -glass or rock -wool insulation measuring 15 or 23 inches wide by four to eight feet long and various thickness'. Sometimes "faced" (meaning to have a paper covering on one side) or "unfaced" (without paper).

Treads - The level parts of a staircase. Also see risers.

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