Tuesday, 31 December 2013 Written by Administrator
» Raised flooring system - The accessibility and flexibility of raised flooring makes it a must-have for the modern day office. With an end to end manufacturing process and
stringent quality control.
» Radial shrinkage In wood, shrinkage perpendicular to the growth rings.
» Rabbet A longitudinal groove cut at the edge of a member to receive another member; also called a
rebate.
» Radiant barrier A reflective foil or metal placed adjacent to an airspace in roof or wall assemblies as a deterrent to the pas- sage of infrared energy.
» Radiant heating system Providing heat to spaces and their inhabitants by heating one or more surfaces of each room. The heated surface is usually either the floor or the
ceiling. Heat is usually provided ei- ther by electric resistance coils or by hot- water tubing.
» Radiator See Convector.
» 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; a handrail.
» Rainscreen principle A theor y by which wall cladding is made watertight by pro- viding wind-pressurized air chambers behind joints to eliminate air pressure differentials
between the outside and the inside that might transport water through the joints. See also Pressure-equalized wall design.
» Rainscreen siding Siding systems that include a system of internal drainage, but not necessarily meeting all the criteria of a pressure-equalized wall design.
» Raised access flooring See Access flooring.
» Rake The sloping edge of a steep roof.Raked mortar joint A mortar joint in which mortar has been removed from the portion of the joint closest to the surface of the masonr y.
» 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.
» Random stone masonry See Uncoursed stone masonry.
» Ratchet A mechanical device with sloping teeth that allows one piece to be advanced against another in small increments, but not to move in the reverse direction.
» Ray A tubular cell that runs radially in a tree trunk.
» RBM See Reinforced brick masonry. Rebar See Steel reinforcing bars. Rebate See Rabbet.
Reflective coated glass Glass onto which a thin layer of metal or metal oxide has been deposited to reflect light and/or heat.
» Reglet A slot, usually horizontal, and inclined in cross section, into which a flashing or roof membrane may be insert- ed in a concrete or masonr y surface.
» Reinforced brick masonry (RBM) Brick- work into which steel bars have been em- bedded to impart tensile strength to the construction.
» Reinforced concrete Concrete work into which steel bars have been embed- ded to impart tensile strength to the con- struction.
» Relative humidity A percentage repre- senting the ratio of the amount of water vapor contained in a mass of air to the maximum amount of water it could con- tain under the
existing conditions of tem- perature and pressure.
» Relieved back A longitudinal groove or series of grooves cut from the back of a 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 insu- lating properties.
» Replacement window A window unit that is designed to be installed easily in an opening left in a wall by a deteriorated window unit that has been removed.
» Repointing The process of removing de- teriorated mortar from the zone near the
surface of a brick wall and inserting fresh mortar. See also Tuckpointing.
» Reshoring Inserting temporar y sup- ports under concrete beams and slabs after the formwork has been removed to prevent overloading prior to full curing of the concrete.
» Resilient clip A springy mounting device for plaster or gypsum board that helps re- duce the transmission of sound vibrations through a wall or ceiling.
» Resilient flooring A manufactured sheet or tile flooring made of asphalt, polyvinyl chloride, linoleum, rubber, or other elas- tic material.
» Resin A natural or synthetic, solid or semisolid organic material of high mo- lecular weight, used in the manufacture of paints, varnishes, and plastics.
» Restraightening A step in the finish- ing of concrete slabs for the purpose of removing minor undulations produced during floating or troweling.
» Retaining wall A wall that resists hori- zontal soil pressures at an abrupt change in ground elevation.
» Retarding admixture An admixture used to slow the curing of concrete, mor- tar, or plaster.
» Ridge beam A structural beam support- ing the upper ends of rafters in a sloped roof, required where the rafters are not tied at their lower ends.
» Ridge board A nonstructural framing member against which the upper ends of rafters are fastened.
» Ridge vent A screened, water-shielded ventilation opening that runs continu- ously along the ridge of a gable roof.
» Rigid connection A fully restrained moment connection.
» Rigid frame Two columns and a beam or beams attached to one another with moment connections; a moment-resisting frame.
» Rim joist See Band joist.
» Rise A difference in elevation, such as the rise of a stair from one floor to the next or the rise per foot of run in a slop- ing roof.
» Riser A single vertical increment of a stair; the vertical face between two treads in a stair; a vertical run of plumbing, wir- ing, or ductwork.
» Rivet A structural fastener 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 wool An insulating material man- ufactured 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 membrane A waterproof sheet or multiply assembly that protects a low- slope roof from water penetration.
» Roof window Either an openable glazed unit installed in the sloping surface of a roof or, more specifically, a glazed roof unit with the inward sash operation to al- low easy
cleaning.
» Rotary-sliced veneer A thin sheet of wood produced by rotating a log against a long, sharp knife blade in a lathe.
» Rough arch An arch made from mason- r y units that are rectangular rather than wedge- shaped.
» Rough carpentry Framing carpentr y, as distinguished from finish carpentr y. Roughing in The installation of me-
chanical, electrical, and plumbing com-
ponents that will not
be exposed to view in 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 win- dow unit.
» Rowlock A brick laid on its long edge, with its end exposed in the face of the wall.
» RSI-value The metric equivalent of R- value.
» Rubberized underlayment An adhered bituminous sheet material that self-heals around nails, applied to roof sheathing to prevent the entr y of water; also called ice and water
shield.
» Rubble Unsquared stones.
» Run Horizontal dimension in a stair or sloping roof.
» Runner channel A steel member from which furring channels and lath are sup- ported in a suspended plaster ceiling.
» Running bond Brickwork consisting en- tirely of stretchers.
» Runoff bar One of a pair of small rectangular steel bars attached temporar- ily at the end of a prepared groove forthe purpose of permitting the groove to be filled to its ver y end
with weld metal. Run plaster ornament A linear mold-
ing 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 resis- tance to the flow of heat; the reciprocal of U-factor.
Last Updated on Tuesday, 21 January 2014 11:54
