R definitions - Building Terms Dictionary



R definitions - Do you know architectual drafting or building terms starting with the letter "R"?

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Rabbet:
A longitudinal groove cut at the edge of a member to recieve another member; also called a "rebate".

Radiant barrier:
A reflective foil placed adjacent to an airspace in roof or wall assemblies as a deterrent to the passage of infrared energy.

Raft:
A mat footing.

Rafter:
A framing member that runs up and down the slope of a steep roof.

Rail:
A horizontal framing piece in a panel door,handrail.

Rainscreen principle:
A theory by which wall cladding is made watertight by providing wind-pressurized air chambers behind joints to eliminate air pressure differentials between the outide and the inside that might transport water through the joints.

Rake:
The sloping of a steep roof.

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Raker:
A sloping brace for supporting sheeting around an excavation.

Ram:
A hydraulic piston device used for bending steel, tensioning steel strands in prestressed concrete, or lifting heavy loads.

Ratchet:
A mechanical device with sloping teeth that allows one piece to be advanced against another in a small increments, but not to move in the reverse direction.

Ray:
A tubular cell that runs radially in a tree trunk.

RBM:
Reinforced Brick Masonry

Reflective coated glass:
Glass onto which a thin layer of metal oxide has been deposited to reflect light and/or heat.

Riglet:
A horizontal slot, inclined in cross section, into which a flashing or roof membrane may be inserted in a concrete or masonry surface.

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Reinforced brick masonry (RBM):
Brickwork in which steel bars has been embedded to impart tensile strength to the construction.

Reinforced concrete:
Concrete work into which steel bars have been embedded to impart tensile strength to the construction.

Relative humidity:
A percentage representing the ratio of the amount of water vapor contained in a mass of air to the amount of water it could contain under the existing conditions of temperature and pessue.

Relieved back:
A lonitudinal groove or series of grooves cut from the back of flat wood molding or flooring strip to minimize cupping forces and make the piece easier to fit to a flat surface.

Removable glazing panel:
A framed sheet of glass that can be attached to a window sash to increase its thermal insulating properties.

Replacement window:
A window unit that is designed to install easily in an opening left in a wall by a deteriorated window unit that has been removed.

Reshoring:
Inserting temporary supports under concrete beams and slabs after the frmwork has been removed, to prevent overloading prior to full curing of the concrete.

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Resilient clip:
A springy mounting device for plaster or gypsum bard that helps reduce the transmission of sound vibrations through the wall or ceiling.

Resilient flooring:
A manufactured sheet or tile flooring made by asphalt,polyvinyl chloride, linoleum, rubber or other elastic materials.

Resin:
A natural or synthetic, solid or semisolid organic material of high molecular weight, used in the manufacture of aints,varnishes, and plastics.

Retaining wall:
A wall that resists horizontal soil pressures at any abrupt change in ground elevation.

Ridge board:
The board against which tips of rafters are fastened.

Rigid frame:
Two columns and a beam or beams attached to one another with moment connections, a moment-resisting building frame.

Rise:
A difference in elevation, such as the rise of a stair from one floor to the next or rise per foot of run in a sloping roof.

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Riser:
A single vertical increment of a stair; the vertical face between two treads in a stair; a vertical run of plumbing,wiring, or dictwork.

Rivet:
A structural fastenr on which a second head is formed after the fastener is in place.

Rock anchor:
a posttensioned rod or cable inserted into a rock formation for the purpose of tying it together.

Rock work:
An insulating material manufactured by forming fibers from molten rock.

Roofer:
One who installs roof coverings.

Roofing:
The material used to make a roof watertight, such as shingles,slate,tiles,sheet metal, or a roof membrane; the act of applying roofing.

Roof window:
An openable window designed to be installed in a sloping surface of a roof.

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Rotary-sliced veneer:
A thin sheet of wood produced by rotating a log agianst a long,sharp knife blade in a lathe.

Rough arch:
An arch made from masonry units that are rectangular rather than wedge shaped.

Rough carpentry:
Framing carpentry, as estinguished from " finish carpentry".

Roughing in:
The installation of mechanical, electrical, and plumbing components that will not be exposed to view the finished building.

Rough opening:
The clear dimensions of the opening that must be provided in a wall frame to accept a given door or window unit.

Rowlock:
A brick laid on its long edge, with its end exposed in the face of the wall.

Rubble:
Unsquared stones.

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Run:
Horizontal dimension in a stair or sloping roof.

Runner channel:
A steel member from which furring channels and lath are supoorted in a suspended plaster ceiling.

Running bond:
Brickwork consisting entirely of stretchers.

Runoff bar:
One of a pair of small rectangular steel bars attached temporarily at the end of a prepared groove for the purpose of permitting the groove to be filled to its very end with weld metal.

Run plaster ornament:
A linear molding produced by passing a profiled sheet metal or plastic template back and forth across a mass of wet plaster.

R-value:
A numerical measure of resistance to the flow of heat.


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