- Racking
- Roofing application method in which shingle courses are applied vertically up the roof, rather than across and up. Not a recommended procedure.
- Radiant Heat Barrier
- A silver foil blanket used in place of or in conjunction with other insulation. Does not have a R-value. Reflects heat back into the building in winter, and reflects the heat away in the summer.
- Radiant Heating
- Electric heating elements are enclosed in the ceiling panels; a separate thermostat controls each area or room.
- Rafter
- Structural member that supports a roof. Trusses have to a great extent taken over the job rafters used to do.
- Rake
- The inclined edge of a slope roof over a wall. (The edge above the gutter)
- Reinforcing
- To make stronger, usually refers to Rebar (steel rods) or mesh used in concrete slabs, columns or beans.
- Release Tape
- Plastic or paper strip is applied to the back of self-seeking shingles. This strip prevents the shingles from sticking together in the bundles, and need not be removed for application.
- Retaining Wall
- Wall that supports or holds back landscaping or earthworks on a hill. Wall is often made of poured concrete, interlocking block, or railroad ties.
- Reversed Polarity
- Usually noted on outlets, indicates that the hot and the neutral wires have been reversed (connected to the wrong terminals)
- Ridge
- The line or top of the roof, the peak, where the roof is divided, one side from the other.The uppermost, horizontal external angle formed by the intersection of two sloping roof planes.
- Ridge Beam
- Structural member running the length of the Ridge supporting the upper ends of the rafters, not used with trusses. Commonly a 2″ x 6″.
- Roof Space
- Attic area, or area between a dwarf partition and sloping roof.
- Roll Roofing
- Asphalt roofing material similar to shingles but on a roll 36 inches wide.
- Roof Sheathing
- Wood covering the roof, under the shingles. Usually OSB board.
- Romex
- Romex wire is the standard type of wiring used inside homes today, recognizable by its off-white color plastic exterior.
- Roof Deck
- See decking.