Rack |
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A metal grid that is used to properly space and
align floor tiles.
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Ragging Off |
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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.
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Rake or rake line |
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The inclination from a horizontal direction.
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Raked joint |
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A joint in a masonry wall which has the mortar raked
out to a specified depth while it is only slightly
hardened.
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Raw glaze |
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A glaze compounded primarily from raw constituents,
that is, containing no prefused materials. (ASTM C
242).
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Receptor |
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A metallic or nonmetallic waterproof support for a
shower stall. (TCA)
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Reducer |
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A trim unit used to reduce the radius of a bullnose
or a cove to another radius or to a square. (TCA)
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Refractory concrete |
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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.
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Reinforced concrete |
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Concrete containing adequate reinforcement (prestressed
or not prestressed) and designed on the assumption
that the two materials act together in resisting
forces.
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Reinforced masonry |
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Unit masonry in which reinforcement is embedded in
such a manner that the two materials act together in
resisting forces.
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Reinforcement, mesh |
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See Welded-wire fabric and Welded-wire fabric
reinforcement.
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Relative humidity |
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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.
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Release agent |
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Material used to prevent bonding of concrete to a
surface. (See also Bond breaker.)
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Return |
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The ending of a small splash wall or a wainscot at
right angle to the major wall.
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Rockingham ware |
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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).
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Rod saw |
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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.
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Rodding |
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See Floating.
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Roughing in |
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The act of preparing a surface by applying tar paper
and metal lath (or wire mesh). Sometimes called
wiring.
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Rubber spacers |
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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".
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Rubber trowel |
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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.
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Rubbing stone |
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A Carborundum stone that is used to smooth the rough
edges of tile.
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Rutile |
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A mineral form of titanium oxide (TiO2) (tetragonal
crystallization), but usually produced chemically
for use in ceramics and other products. (ASTM C 21)
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