Rabbet |
A rectangular longitudinal groove
cut in the corner edge of a board or plank. |
Radiant
heating |
A method of heating, usually consisting of a
forced hot water system with pipes placed in the floor, wall,
or ceiling. Also electrically heated panels. |
Radiation |
Energy transmitted from a heat source to the
air around it. Radiators actually depend more on convection
than radiation. |
Radon |
A naturally-occurring, heavier than air, radioactive
gas common in many parts of the country. Radon gas exposure
is associated with lung cancer. Mitigation measures may involve
crawl space and basement venting and various forms of vapor
barriers. |
Radon system |
A ventilation system beneath the floor of a basement
and/or structural wood floor and designed to fan exhaust radon
gas to the outside of the home |
Rafter |
Lumber used to support the roof sheeting and
roof loads. Generally, 2 X 10's and 2 X 12's are used. The rafters
of a flat roof are sometimes called roof joists. |
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 2-inch-thick
members. |
Rail |
Cross members of panel doors or of a sash. Also,
a wall or open balustrade placed at the edge of a staircase,
walkway bridge, or elevated surface to prevent people from falling
off. Any relatively lightweight horizontal element, especially
those found in fences (split rail). |
Railroad
tie |
Black, tar and preservative impregnated, 6"
X 8" and 6'-8' long wooden timber that was used to hold
railroad track in place. Normally used as a member of a retaining
wall. |
Rake |
Slope or slanted. |
Rake fascia |
The vertical face of the sloping end of a roof
eave. |
Rake siding |
The practice of installing lap siding diagonally |
Ranch |
A single story, one level home. |
Ready mixed
concrete |
Concrete mixed at a plant or in trucks en route
to a job and delivered ready for placement. |
Rebar, reinforcing
bar |
Ribbed steel bars installed in foundation
concrete walls, footers, and poured in place concrete structures
designed to strengthen concrete. Comes in various thickness'
and strength grade. |
Receptacle |
An electrical outlet. A typical household will
have many 120 volt receptacles for plugging in lams and appliances
and 240 volt receptacles for the range, clothes dryer, air conditioners,
etc. |
Recording
fee |
A charge for recording the transfer of a property,
paid to a city, county, or other appropriate branch of government. |
Redline,
red lined prints |
Blueprints that reflect changes and that are
marked with red pencil. |
Reducer |
A fitting with different size openings at either
end and used to go from a larger to a smaller pipe. |
Reflective
insulation |
Sheet material with one or both faces covered
with aluminum foil. |
Refrigerant |
A substance that remains a gas at low temperatures
and pressure and can be used to transfer heat. Freon is an example
and is used in air conditioning systems. |
Register |
A grill placed over a heating duct or cold air
return. |
Reglaze |
To replace a broken window. |
Relief valve |
A device designed to open if it detects excess
temperature or pressure. |
Remote |
Remote electrical, gas, or water meter digital
readouts that are installed near the front of the home in order
for utility companies to easily read the home owners usage of
the service. |
Retaining
wall |
A structure that holds back a slope and prevents
erosion. |
Retentions |
Amounts withheld from progress billings until
final and satisfactory project completion. |
R factor
or value |
A measure of a materials resistance to the passage
of heat. New homewalls are usually insulated with 4" of
batt insulation with an R value of R-13, and a ceiling insulation
of R-30. |
Ribbon (girt) |
Normally a 1 X 4 board let into the studs horizontally
to support the ceiling or second-floor joists. |
Ridge |
The horizontal line at the junction of the top
edges of two sloping roof surfaces. |
Ridge board |
The board placed on the ridge of the roof
onto which the upper ends of other rafters are fastened. |
Ridge shingles |
Shingles used to cover the ridge board. |
Rim joist |
A joist that runs around the perimeter of the
floor joists and home. |
Rise |
The vertical distance from the eaves line to
the ridge. Also the vertical distance from stair tread to stair
tread (and not to exceed 7 _"). |
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 at
the "Rough Electric" stage. |
Road base |
A aggregate mixture of sand and stone. |
Rock 1,
2, 3 |
When referring to drywall, this means to install
drywall to the walls and ceilings (with nails and screws), and
before taping is performed. |
Roll, rolling |
To install the floor joists or trusses in their
correct place. (To "roll the floor" means to install
the floor joists). |
Romex |
A name brand of nonmetallic sheathed electrical
cable that is used for indoor wiring. |
Roll roofing |
Asphalt roofing products manufactured in roll
form. 36-inch wide rolls with and 108 square feet of material.
Weights are generally 45 to 90 pounds per roll. |
Romex |
A name brand of nonmetallic sheathed electrical
cable that is used for indoor wiring. |
Roof jack |
Sleeves that fit around the black plumbing waste
vent pipes at, and are nailed to, the roof sheeting. |
Roof joist |
The rafters of a flat roof. Lumber used to support
the roof sheeting and roof loads. Generally, 2 X 10's and 2
X 12's are used. |
Roof sheathing
or sheeting |
The wood panels or sheet material fastened
to the roof rafters or trusses on which the shingle or other
roof covering is laid. |
Roof valley |
The "V" created where two sloping roofs
meet. |
Rough opening |
The horizontal and vertical measurement of a
window or door opening before drywall or siding is installed. |
Rough sill |
The framing member at the bottom of a rough opening
for a window. It is attached to the cripple studs below the
rough opening. |
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 second finishing phase are assembled.
See also Heat Rough,Plumbing Rough, and Electrical Rough. |
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 stair tread from
the nose to the riser. |
R Value |
A measure of insulation. A measure of a materials
resistance to the passage of heat. The higher the R value, the
more insulating "power" it has. For example, typical
new home's walls are usually insulated with 4" of batt
insulation with an R value of R-13, and a ceiling insulation
of R-30. |
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