radiant heating: A method of heating, usually consisting of a forced hot water system with pipes placed in the floor, wall, or ceiling; or with electrically heated panels.

rafter: One of a series of structural members of a roof designed to support roof loads. The rafters of a flat roof are sometimes called roof joists.

register: The open end of a duct for warm or cool air; usually covered with screening.

reinforced concrete: Concrete with steel bars or webbing embedded for strength.

retaining wall: A wall which holds back an earth embankment.

ridge: The top edge of the roof where two slopes meet.

ridge board: The board placed on edge at the ridge of the roof into which the upper ends of the rafters are fastened.

rim joists: the horizontal structural member that supports the outside edge of floor or ceiling system

rise: In stairs, the vertical height of a step or flight of stairs.

riser: Each of the vertical boards closing the spaces between the treads of stairways.

roof sheathing: The boards or sheet material fastened to the roof rafters on which the shingles or other roof covering is laid.

rough opening: A framed opening in a structure into which doors, windows, and other finished trim are set.

rough sawn cedar: Western Red Cedar with wood surface that has been roughened by theaction of cutting tools at the mill.

 

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