Common Housing Terms
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Rabbet
A groove cut in a board to receive another board.

Radiant Heat
Coils of electricity, hot water or steam pipes embedded in floors, ceilings, or walls to heat rooms.

Rafter
One of a series of structural roof members spanning from an exterior wall to a center ridge beam or ridge board.

Reinforced Concrete
Concrete strengthened with wire or metal bars.

Ridge Pole
A thick longitudinal plank to which the ridge rafters of a roof are attached.

Riser
The upright piece of a stair step, from tread to tread.

Roof Sheathing
Sheets, usually of plywood, which are nailed to the top edges of trusses or rafters to tie the roof together and support the roofing material.