| Rack |
 |
A metal grid that is used to properly space and align floor tiles.
|
| Ragging Off |
|
The procedure of spreading damp cheese cloth and pulling it over the tile surface during the tile grouting process in order to clean the tile.
|
| Rake or rake line |
|
The inclination from a horizontal direction.
|
| Raked joint |
|
A joint in a masonry wall which has the mortar raked out to a specified depth while it is only slightly hardened.
|
| Raw glaze |
|
A glaze compounded primarily from raw constituents, that is, containing no prefused materials. (ASTM C 242).
|
| Receptor |
|
A metallic or nonmetallic waterproof support for a shower stall. (TCA)
|
| Reducer |
|
A trim unit used to reduce the radius of a bullnose or a cove to another radius or to a square. (TCA)
|
| Refractory concrete |
|
Concrete having refractory prop-. erties, and suitable for use at high temperatures (generally about 315 to 1315 C), in which the binding agent is a hydraulic cement.
|
| Reinforced concrete |
|
Concrete containing adequate reinforcement (prestressed or not prestressed) and designed on the assumption that the two materials act together in resisting forces.
|
| Reinforced masonry |
|
Unit masonry in which reinforcement is embedded in such a manner that the two materials act together in resisting forces.
|
| Reinforcement, mesh |
|
See Welded-wire fabric and Welded-wire fabric reinforcement.
|
| Relative humidity |
|
The ratio of the quantity of water vapor actually present to amount present in a saturated atmosphere at a given temperature; expressed as a percentage.
|
| Release agent |
|
Material used to prevent bonding of concrete to a surface. (See also Bond breaker.)
|
| Return |
|
The ending of a small splash wall or a wainscot at right angle to the major wall.
|
| Rockingham ware |
|
A semivitreous ware or earthenware having a brown or mottled brown bright glaze. Originated in England on the estate of the Marquis of Rockingham. (ASTM C 242).
|
| Rod saw |
|
The rod saw is one of the newest tools used in the cutting of tile. It is a steel rod approximately 1/s" in diameter. The rod has tungsten carbide particles embedded in the surface. The rod saw is used to cut circles or irregular curves in tile.
|
| Rodding |
|
See Floating.
|
| Roughing in |
|
The act of preparing a surface by applying tar paper and metal lath (or wire mesh). Sometimes called wiring.
|
| Rubber spacers |
|
Cross and tee-shaped objects used to space tile on floors or walls. They are manufactured in thicknesses of 1/16", 1/8", 1/4", 3/8", and 1/2".
|
| Rubber trowel |
|
The rubber trowel used for grouting is a non-porous synthetic-rubber-faced float that is mounted on an aluminum back with a wood handle. This trowel is used to force material deep into tile joints and to remove excess material for a perfect finish.
|
| Rubbing stone |
|
A Carborundum stone that is used to smooth the rough edges of tile.
|
| Rutile |
|
A mineral form of titanium oxide (TiO2) (tetragonal crystallization), but usually produced chemically for use in ceramics and other products. (ASTM C 21)
|
