Rafter
A sloping beam, parallel to the other rafters that together form the main structure of a roof.
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Rail
Horizontal support or member in door or fence.
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Random Rubble
A basic stone wall construction with no attempt at bonding or coursing.
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Rebate
A rectangular recess along the edge of a work-piece, usually as part of a joint; to cut such recesses.
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Relieving Arch
An arch above a lintel or beam that takes the weight of the wall above.
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Render / Rendering
A wall covering. Internally usually plaster and externally usually cement but sometimes pebbledash, stucco or Tyrolean textured finish.
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Renovation
Repairing an item to its original or near-original condition.
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Re-pointing
Removing mortar from between brick joints and replacing it with new mortar, to prevent damp.
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Re-Roof
The existing roof covering is removed and replaced with new under felt and batons. The original tiles/slates are either reused or replaced.
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Residual Current Device (RCD)
A type of fuse which monitors the flow of electrical current through the live and neutral wires of a circuit. When an RCD detects an imbalance caused by earth leakage, it cuts off the supply of electricity as a safety measure.
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Retention
An agreed amount of money held back by the client as an insurance against repair.
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Reveal
The vertical side of an opening in a wall.
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Ridge
Top of a pitched roof.
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Ridge Tile
A semi-circular tile made from concrete or clay, covering the ridge where two sloping roofs meet.
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Ring Main
Power circuit for sockets.
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Rise
Vertical distance from one stair tread to the next.
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Riser
Upright part of a stair OR vertical water pipe from the mains.
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Rising Damp
Moisture soaking up a wall from the ground below, causing plaster decay, rot in timbers and damage to decoration.
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Rising Main
A pipe that supplies water under mains pressure, often to a storage tank in the roof.
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Rolled Steel Joist (RSJ)
A steel beam used for structural support.
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Roof Pitch
The angle at which a roof slopes.
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Roof Spread
Outward bowing of a wall caused by horizontal pressure applied by a roof that has been badly constrained. (See also Collar).
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Roof Truss
Prefabricated structural timer framework that supports a roof.
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Roof Valley
The junction where two separate roofs meet.
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RWP
Rain water pipe, which collects rainwater and feeds it into the drainage system.
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