R

1.Abbr. for “radius.” 2.Abbr. for “right.” 3. Symbol for the capacity of a pile (for example, 3R indicates three times design capacity). 4. Symbol for the thermal resistance of a  material or component of construction. 5.Symbol for electrical resistance.

Abbr. for “registered architect.”

A rod or stick used by masons in mixing hair with mortar.

A bead in the reentrant angle of a rabbet.
 

In glazing, the depth of the glazing rabbet; equal to the sum of the bite and the edge clearance.

An edge joint formed by fitting together rabbeted boards or timbers.

In glazing, the actual size of the rabbeted glass opening; equal to the glass size plus two edge clearances.

1.A longitudinal channel, groove, or recess cut out of the edge or face of a member; esp. one to receive another member, or one to receive a frame inserted in a door or window opening, or the recess into which glass is installed in a window sash. 2.A rabbet joint.3.A shallow recess in one body to receive another, as at the edges of a pair of doors or windows so shaped as to provide a tight fit; one half of the edge projects beyond, and serves as a stop for, the other edge of each leaf. 4.A rabbet plane.

A doorjamb with a rabbet, 3, to receive a door. 

 A lock or latch in which the face is flush with the rabbet on a rabbeted doorjamb.
 

 A stop, 1 which is integral with a door or window frame.

Any channel designed to enclose and loosely hold electric conductors; may be of metal or of an insulating material; various types include rigid conduit, flexible metallic conduit, nonmetallic conduit, metallic tubing, underfloor raceways, cellular floor raceways, surface metal raceways, structural raceways, wireways and busways, and auxiliary gutters or moldings.

A system for distributing cable in an open or closed metal tray that is suspended within a false ceiling from the structural floor above; generally used in large buildings where complex cable distribution systems require special support.

A saw having wide teeth.

An elevator having electrically driven rotating gear pinions mounted on the car; rotation of the gear pinions moves the car up or down on a stationary gear rack which is mounted vertically in the hoistway. 

Descriptive of timbering which is braced, providing additional support to prevent deformation.
 

1.The distortion or movement of a frame.2.The out of plumbness of a structure, or any of its components, that are a result of seismic stress or wind acting on the structure; may also result from thermal expansion and contraction.

The stepping back of courses of brick during the construction phase of a wall, usually in expectation of the wall’s completion at a later date.

A load applied in the plane of an assembly in such manner as to lengthen one diagonal and shorten the other.

Abbr. for radiator.

Same as segmental arch

A roof supported by a system of arches radiating from a central point.
 

Nonrectangular grating, in which the bearing bars extend radially from a common center and the cross bars have a pattern of concentric circles.

One of a group of roads which radiate outward from the center of a city, as spokes on a wheel.

The shrinkage of wood across the growth rings during drying; the loss in dimension along the radius of a log.

A circular saw which is suspended from, and moves along,a cantilevered arm, mounted above the saw table; the blade can be set at any angle (or tilted) with respect to the work.

A heavy-duty industrial fan used for severe service, e.g., where foreign material (such as wood chips) passes directly through the fan.

See quarter-cut.

Rectangular grating that is cut into panels shaped as annular segments, for use in circular or annular areas.

The rate of radiant emission per unit solid angle and per unit projected area of a source in a stated angular direction from the surface.

Glass containing radiant heating elements.

Heating which results from heat transmitted by radiation, as contrasted with heat transmitted by conduction or convection.

A system for heating a room or space by means of heated surfaces (such as panels heated by the flow of hot water  or electric current) which provide heat primarily by radiation.

An ASTM  standard method of test for the surface flammability of a material, using a radiant heat source.

Chapels projecting radially from the curve of an ambulatory or rarely of an apse.

The transmission of heat through space by means of electromagnetic waves; the heat energy passes through the  air  between the source and the heated body without heating the intervening air appreciably.

See lead lined door. 

A heating unit usually exposed to view within the room or space to be heated; transfers heat by radiation to objects within visible range, and by conduction to  the  surrounding  air,which in turn is circulated by natural convection;usually fed by steam or hot water.
 

The horizontal axial distance an airstream travels after leaving an air outlet before the maximum stream velocity is reduced to a specified terminal value.

See fillet gauge.

In mechanics, the distance from the axis to a point such that, if the whole mass of a body were concentrated at it, the moment of inertia would remain unchanged.

1.A plastering tool;a wooden arm fixed at one end to a mold and attached at the other end to a center about which it swivels;a gig stick.2.A long wooden arm with a marker at one end for tracing large curves.

A zinc plate attached to one side of a plasterer’s radius rod at midpoint.

A radius rod.

A curved wall that is a segment of a circle.

A gaseous emanation produced by the radioactive decay of radium,given off by some soils and rocks;it may collect and constitute a health hazard in buildings with poor ventilation.

See floating foundation.

Same as floating foundation.

One of a series of inclined structural members from the ridge of the roof down to the eaves,providing support for the covering of a roof.For special types of rafters,see beveled rafter,binding rafter,common rafter,compass rafter, compound rafter,fly rafter, hip rafter,jack rafter,knee rafter,notched rafter,principal rafter,valley rafter.

Same as beam fill.