Racking -  Roofing application method in which shingle courses are applied vertically up the roof rather than across and up. Not a recommended procedure.

Rafter -  The supporting framing member immediately beneath the deck, sloping from the ridge to the wall plate.

Rake -  The inclined edge of a sloped roof over a wall.

Random-tab shingles - Shingles on which tabs vary in size and exposure.

Release tape - A plastic or paper strip that is applied to the back of self-sealing shingles. This strip prevents the shingles from sticking together in the bundles, and need not be removed for application.

Ridge -  The uppermost, horizontal external angle formed by the intersection of two sloping roof planes.

Ridge shingles - Shingles used to cover the horizontal external angle formed by the intersection of two sloping roof planes.

Rise -  The vertical distance from the eaves line to the ridge.

Roll roofing -  Asphalt roofing products manufactured in roll form.

Roofing tape -   An asphalt-saturated tape used with asphalt cements for flashing and patching asphalt roofing.

Run -  The horizontal distance from the eaves to a point directly under the ridge. One half the span.

RADIAL SAW - A circular saw which hangs from a horizontal arm or beam and slides back and forth. The arm pivots from side to side to allow for angle cuts and bevels. When sawing finish plywood, the good side should face up as the saw cuts on the down stroke.

RADIATION - Any heated surface loses heat to cooler surrounding space or surfaces through radiation. The earth receives its heat from the sun by radiation. The heat rays are turned into heat as they strike an object which will absorb some or all of the heat transmitted.

RADIATOR - A heating unit which is supplied heat through a hot water system.

RAFTER – A sloping roof member that supports the roof covering which extends from the ridge or the hip of the roof to the eaves. A common rafter is one which runs square with the plate and extends to the ridge. A hip rafter extends from the outside angle of the plate towards the apex of the roof. They are 2" deeper or wider than common rafters. A valley rafter extends from an inside angle of the plates toward the ridge of the house.

RAGGLE BLOCK - A specially designed masonry block having a slot or opening into which the top edge of the roof flashing is inserted and anchored.

RAIL- The top and bottom frame members of a door or window (not the jamb).

RAKE - The angle of slope of a roof rafter, or the inclined portion of a cornice.

RANKIN - Thermometer scale on which unit of measurement equals the Fahrenheit degree.

RE-BAR - Reinforcing bar used to increase the tensile strength of concrete.

REFLECTIVE GLASS –Glass with a metallic coating to reduce solar heat gain.

REGISTER - A fixture through which conditioned air flows. In a gravity heating system, it is located near the baseboard. In an air conditioning system, it is located close to the thermostat.

REGLET - A horizontal slot, formed or cut in a parapet or other masonry wall, into which the top edge of counter-flashing can be inserted and anchored. In glazing, a reglet is typically a pocket or keyway extruded into the framing for installing the glazing gaskets.

REINFORCED CONCRETE - A combination of steel and concrete using the best properties of each. The steel consists of rebar or reinforcing bars varying from 3/8 " to 2 1/4 "in diameter and is placed before concrete is poured.

REINFORCED MASONRY - Masonry units, reinforcing steel, grout and/or mortar combined to act together to strengthen the masonry structure.

RELATIVE HEAT GAIN – The amount of heat gain through a glass product taking into consideration the effects of solar heat gain (shading coefficient) and conductive heat gain (U-value).

RESISTANCE- The internal structure of wires even in the best conductors opposes the flow of electric current and converts some current into heat. This internal friction-like effect is called resistance and is measured in ohms. Resistance equals Voltage divided by Amperage.

RETURN – In heating and cooling systems, a vent that returns cold air to be warmed. In a hot air furnace system, it is located near an inside wall.

RIGID METAL CONDUIT - This conduit resembles plumbing pipe, protecting wires from damage.

ROMEX - A nonmetallic sheathed cable consisting of two or more insulated conductors having an outer sheath of moisture resistant, nonmetallic material. The conductor insulation is rubber, neoprene, thermoplastic or a moisture resistant flame retardant fibrous material. There are two types: NM and NMC - described earlier.

ROOF SYSTEM - General term referring to the waterproof covering, roof insulation, vapor barrier, if used and roof deck as an entity.

ROUGH – In hardware, metal fastenings on cabinets which are usually concealed, like staples

ROUGH OPENING – The opening in a wall into which a door or window is to be installed.

ROUGH PLUMBING - All plumbing that should be done before the finish trades (sheetrock, painting, etc), including all waste lines and supply water lines that are in the walls or framing of the building. See also: Plumbing, Sub Rough, and Finish Plumbing.

RPM - Revolutions per Minute.

RUBBER TIRED ROLLER - A roller with rubber tires commonly used for compacting trimmed subgrade or aggregate base or clay type soils.

RUN - The horizontal distance between the eaves and the ridge of the roof, being half the

span for a symmetrical gable roof.

R-VALUE – The thermal resistance of a glazing system. The R-value is the reciprocal of the U-value. The higher the R value, the less heat is transmitted throughout the glazing material.

RAGGLE BLOCK - A specially designed masonry block having a slot or opening into which the top

edge of the roof flashing is inserted and anchored.

RAKE - The angle of slope of a roof rafter, or the inclined portion of a cornice.

REFLECTIVE - A term referring to a material that has a white or shiny metallic surface.

REGLET - A horizontal slot, formed or cut in a parapet or other masonry wall, into which the top edge of counterflashing can be inserted and anchored.

RE-IMPREGNATE - To replace oils and bitumen in the components of the BURM which through weathering and oxidation, have been lost.

ROOF - The assembly of interacting components designed to weatherproof and normally to insulate a buildings surface, separated from adjacent assemblies by walls or changes in elevation.

ROOF COATING - A bituminous material, either a cutback or an emulsion, to protect the surface of the

BURM but not necessarily to re-impregnate it.

ROOF DECK - That component in building construction, which forms a platform on which the remainder of the BURM components are placed.

ROOF DRAIN - The termination or fitting at the roof of an interior drain or leader, for draining rain water from nominally flat roofs.

ROOF SYSTEM - General term referring to the waterproof covering, roof insulation, vapor barrier, if

used and roof deck as an entity.

RUN - The horizontal distance between the eaves and the ridge of the roof, being half the span for a symmetrical gable roof.