Home Construction Terms: R
Rafter: One of a series of single roof frame pieces spanning between supports to carry the roof sheathing and roofing.
Rafter, Hip: A rafter that forms the intersection of an external roof angle.
Rafter, Valley: A rafter that forms the intersection of an internal roof angle. The valley rafter is normally made of double 2x members.
Rake: Sloped or slanted.
Rake Fascia (aka Barge Rafter): The vertical face of the sloping end of a roof eave.
Rebar (aka Reinforcing Bar): Ribbed steel bars installed in foundation, concrete walls, footers, and poured in place in concrete structures designed to strengthen concrete. Comes in various thicknesses and strength grades.
Receptacle: An electrical outlet.
Redhead (aka Wedge Anchor): A substitute for anchor bolts that is added (into a drilled hole) after the concrete has set.
Reducer: A fitting with different size openings at either end and used to go from a larger to a smaller pipe.
Refrigerant: A substance that remains a gas at low temperatures and pressure and can be used to transfer heat. Freon is the most well known example.
Register: A grill placed over an HVAC duct to direct/balance air flow.
Relief Valve: A device designed to open if it detects excess temperature or pressure, such as the T & P valve on a water heater.
R Factor (or R Value): A measure of a materials resistance to the passage of heat. Home walls are usually insulated with 6″ of batt insulation with an R value of R-19, and 12” of ceiling insulation of R-38.
Ridge: The horizontal line at the junction of the top edges of two sloping roof surfaces.
Ridge Blocks: Framing members that tie rafters or trusses together at the peak.
Ridge Cap: Shingles used to cover the ridge.
Rim Joist: A joist that runs around the perimeter of the floor joists.
Rise: The vertical distance from the eave line to the ridge. Also the vertical distance from stair tread to stair tread (and not to exceed 7 3/4″).
Riser: Each of the vertical boards closing the spaces between the treads of stairways.
Riser and Panel: The exterior vertical pipe (riser) and metal electric box (panel) the electrician provides and installs.
Roll, Rolling: To install the roof or floor joists or trusses in their correct place. (To “roll the roof” means to install the roof trusses).
Roof Jack (aka Boot): Sleeves that fit around roof penetrations at, and are nailed to the roof sheeting to prevent water leaks.
Roof Joist: The rafters of a flat roof.
Roof Sheathing or Sheeting: The wood panels (OSB) fastened to the roof rafters or trusses on which the shingles or other roof covering is laid, and which creates a structural diaphragm.
Roof Valley: The “V” created where two sloping roofs meet.
Rough Opening: The horizontal and vertical measurement of a window or door opening at rough framing.
Roughing-In: The initial stage of a plumbing, electrical, heating, carpentry, and/or other project, when all components that won’t be seen after the finishing phase are assembled and installed.
Run, Roof: The horizontal distance from the eaves to a point directly under the ridge. One half the span.
Run, Stair: The horizontal distance of a stairway from end to end.