L cut |
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A piece of tile cut or shaped to the letter L.
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Laitance |
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A layer of weak and nondurable material containing
cement and fines from aggregates, brought by
bleeding water to the top of overwet concrete; the
amount of which is generally increased by
overworking or overmanipulating concrete at the
surface by improper finishing or by job traffic.
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Lap |
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The length by which one bar or sheet of fabric
reinforcement overlaps another.
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Latex |
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A water emulsion of a synthetic rubber or plastic
obtained by polymerization and used especially in
coatings and adhesives.
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Latex-portland cement grout |
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A portland cement grout with a special latex
additive which results in a less rigid, less
permeable grout than regular portland cement grout.
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Latex-portland cement mortar |
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A 'mixture of portland cement, sand, and special
latex additives which is used for bonding tile to
back-up material. It is less rigid than portland
cement mortar.
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Lath |
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A wood strip or metal mesh, which acts as a
background or reinforcing agent for the scratch coat
or mortar coat. (TCA)
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Layout stick |
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A long strip of wood marked at the appropriate joint
intervals for the tile to be used. It is used to
check the length, width, or height of the tilework.
A common name for this item is idiot stick.
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Leadless glaze |
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A ceramic coating matured to a glassy state on a
formed article, or the material or the mixture from
which the coating is made, to which no lead has been
deliberately added. (ASTM C 21) NOTE: This does not
imply that the glaze is nontoxic or that it contains
no lead. Because of plant practices and conditions,
a small percentage of lead,, 0.1 to 0.2% (by dry
weight), expressed as lead monoxide, may be present.
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Leg |
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A tile wall running alongside a bathtub or abutment.
This term sometimes is used to describe a narrow
strip of tile floor.
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Leveling coat |
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See Plumb scratch.
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Light duty tile |
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Tile suitable for limited pedestrian traffic such as
entryways in single family residences.
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Lime |
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Specifically, calcium oxide (CaO); also, loosely, a
general term for the various chemical and physical
forms of quicklime, hydrated lime and hydraulic
hydrated lime.
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Limestone |
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A sedimentary carbonate rock, composed chiefly of
calcite (Ca C0~, but sometimes containing
appreciable dolomite. (ASTM C 21)
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lippage |
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a condition where one edge of a tile is higher than
an adjacent tile giving the finished surface an
uneven apperance
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Live load |
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Any load that is not permanently applied to a
structure.
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Load-bearing wall |
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A wall designed and built to carry superimposed
vertical and shear loads as opposed to nonload-bearing
walls.
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Loss on ignition |
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The percentage loss in weight of a sample ignited to
constant weight at a specified temperature, usually
900-1000 C.
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Lugs |
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See Self-spacing tile.
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