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Racking
A condition where a structure leans in
such a way that the angles it forms with the
foundation are no longer 90°.
Radiant heating
A system consisting of continuous piping
from the boiler or electric cables
laid out in rows buried in the floor or ceiling, thereby heating a room
by radiation.
Radiation
The transfer of heat from a warmer object
to a cooler object not in contact with
it by radiating heat energy.
Radiators
Heat outlets made of heavy metal piping
that deliver hot water or steam from the
boiler and radiate heat into the room.
Radon
A gas that occurs naturally when uranium
in the soil and rocks breaks down. The
EPA considers radon as a health hazard.
Rafter spread
A condition where the roof load bearing
on the rafters forces them
outwards.
Rafter spread
A phenomenon where the roof load bearing
on the rafters forces them
outwards.
Rafter spread
A phenomenon where the roof load bearing
on the rafters force them
outward.
Rafters
Structural members of a pitched roof that
support the roof covering and transmit
roof loads to bearing walls and beams below.
Rafters
Structural members of a pitched roof that
support the roof covering and transmit
roof loads to bearing walls and beams below.
Rail
The top piece in a window sash.
Rain cap
A metal cap attached to the top of the
chimney flue allowing gasses to escape but
prevents rain from entering the flue.
Rake
The overhang at the gable end of the
roof.
Reciprocating pump
See
Piston pump.
Refrigerant lines
The copper piping that moves the
refrigerant in both gas and liquid
states through a cooling system.
Refrigerant
The gas in a cooling system that changes
between a gas and liquid state,
commonly called Freon.
Registers
Heat outlets in the home that deliver
warm air from the furnace.
Relief valve extension
Discharge piping from the relief
valve on a water heater to the
floor.
Relief valve
On a water heater, a valve that releases
water when temperature or pressure
is too high.
Resilient floor coverings
A range of tiles and sheet goods
laid as a finish floor. Includes
linoleum, rubber tiles, and various vinyl sheets and tiles.
Resistance
The opposition offered by a material when
a current passes through it.
Resistance is measured in units called ohms.
Resting slab
Where a slab is laid to rest on top of a
conventional foundation.
Return ducts
Ducts that deliver cool air from the home
back to the furnace.
Reverse polarity
Where the hot wire is wired to the large
slot in an electrical outlet and
the neutral wire is wired to the small slot, the opposite of how it
should be done.
Reverse polarity
Where the hot wire is wired to the large
slot in an electrical outlet and
the neutral wire is wired to the small slot, the opposite way of how it
should be done.
Reverse trap toilet
A 2-piece (tank and bowl) toilet
with a larger wetted area than earlier
models.
Reversing valve
A valve in a heat pump that changes the
direction of the refrigerant
process.
Ribbon slate
Slate shingles with a ribbon of color in
them.
Ridge board
A horizontal framing board at the peak of
the roof to which rafters are
attached.
Ridge cover
Protective flashing laid across the ridge
and finished with shingles or roll
roofing to protect the ridge from water penetration.
Ridge
The horizontal intersection of two
sloping roof surfaces.
Ridge vent
A vent located on the roof ridge, running
the length of the ridge.
Rigid board insulation
Wide rigid boards of insulation
used on foundations and walls,
made of fiberglass, wood fiberboard, or foamed plastics.
Rigid metal conduit
See
Conduit.
Rise
The vertical height of the roof.
Riser
The vertical portion of a step on a
staircase.
Risers
Water supply pipes that carry water
vertically up through the house.
Rock wool
An insulating fibrous material made by
blowing steam through molten rock or
slag, used as batts, blankets, or loose fill.
Roll roofing
An asphalt-impregnated felted mat of
fibers coated with asphalt formations and
covered with a granular material, used in strips as a roof covering.
Romex cable
A non-metallic sheathed cable used in
branch circuit wiring which carries a
hot, a neutral, and a ground wire.
Roof covering
The outer layer of shingles, tiles, or
other materials used to protect the roof
from water penetration.
Roof truss
An engineered, prefabricated geometric
roof framing component.
Roughed-in fireplace
An opening left with a
connection to the chimney intended to provide
the space for a fireplace to be installed later.
R-rating
The total heat resistance for a given
thickness of insulation and equal to the
insulation's R-value times its thickness.
Run
The horizontal length of the roof from
the eave to the center point.
R-value
A number that represents an insulation
material's resistance to heat flow per inch
of thickness. |