Exposed aggregate finish - A method of finishing concrete which washes the cement/sand mixture off the top layer of the aggregate - usually gravel. Often used in driveways, patios and other exterior surfaces.

Butt hinge - The most common type. One leaf attaches to the door's edge, the other to its jamb.

Header - Heavier framing--usually doubled and laid on edge-- at the top of a window, door, or other opening. In masonry, a header course of bricks or stones laid on edge provides strength.

Warping - Any distortion in a material.

GFCI (ground fault circuit interrupter) - An electrical safety device that instantly shuts down a circuit if a leakage occurs. Codes commonly require them on bathroom and outdoor circuits.

Saturated felt - A felt which is impregnated with tar or asphalt.

Heat loss - Heat escaping from a home usually to outside air. Heat gains and losses are expressed in BTUs per hour.

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