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wall platea horizontal member anchored to a masonry wall to which other structural elements may be attached. also called “head plate.”
wall tiea bonder or metal piece which connects wythes of masonry to each other or to other materials.
wall tie cavitya rigid, corrosion-resistant metal tie which bonds two wythes of a cavity wall. it is usually steel, 3/16″ in diameter and formed in a “z” shape or a rectangle.
wall tilea glazed tile with a body that is suitable for interior use and which is usually nonvitreous, and is not required nor expected to withstand excessive impact or the capillaries.
wall, bearinga wall supporting a vertical load in addition to it own weight. 
wall, cavitya wall in which the inner and outer wythes are separated by an air space but tied together with metal ties. 
wall, compositea wall in which the facing and backing are of different materials and bonded together with bond stones to exert a common reaction under load. 
wall, veneer, or faceda wall in which a thin facing and the backing are of different materials but not so bonded as to exert a common reaction under load. 
wall, wind (wined)a twisting warp from cutting slabs in the gang saws. 
wall, wythethe inner or outer part of a cavity wall.
wallsone of the sides of a room or building connection floor and ceiling or foundation and roof: 
warpagea concave or convex curvature of a tile so that the surface is not perfectly flat.
warped wallsgenerally a condition experienced only in flagging or flagstone materials; very common with flagstone materials that are taken from the ground and used in their natural state. to eliminate warping in stones it would be necessary to further finish the material, by methods such as machining, sand rubbing, honing or polishing.
washa sloped area, or the area water will run over.
water absorptionthe ability to take up and retain water. water-cement ratio. the ratio of the amount of water, exclusive only of that absorbed by the aggregates, to the amount of cement in a concrete or mortar mixture; preferably stated as a decimal by weight.
water bartypically a strip in a reglet in window sill and stone below to prevent water passage.
water levelthe water level is a piece of clear plastic hose 3/8″ to 1/2″ in diameter and usually about 50′ in length. it is filled with water, from which all air must be removed.
water tablea projection of lower masonry on the outside of the wall, slightly above the ground. often a damp course is placed at the level of the water table to prevent upward penetration of ground water.
waterproof membranea membrane, usually made of built-up roofing, to provide a positive waterproof floor over the substrate, which is to receive a tile installation using a wire reinforced mortar bed. 
waxingan expression used in the marble finishing trade to indicate the filling of natural voids with color blended materials.
wearthe removal of material or impairment of surface finishing through friction or impact use.
wearing coursea topping or surface treatment to increase the resistance of a concrete pavement or slab to abrasion.
weatheringnatural alteration by either chemical or mechanical processes due to the action of constituents of the atmosphere, surface waters, soil and other ground waters, or to temperature changes; the inclined top surface of a stone such as a coping, cornice, or window sill.
weatheringchanges in color, texture, strength, chemical composition or other properties of a natural or artificial material due to the action of the weather.
wedgingsplitting of stone by driving wedges into planes of weakness.
weep holesopenings placed in mortar joints of facing material at the level of flashing to permit the escape of moisture.
welded-wire fabrica series of longitudinal and transverse wires arranged substantially at right angles to each other and welded together at all points of intersection.
well-graded aggregateaggregate having a particle size distribution which will produce maximum density, i.e., minimum void space.
wet areasinterior or exterior tiled areas subject to periodic or constant wetting. examples: showers; sunken tubs; pools; exterior walls; roofs; exterior paving and interior floors. 
wet pressingsee pressing, wet. wet process. see process, wet.
wettingthe thorough impregnation of a material by a liquid. the more viscous a fluid, and the higher its surface tension, the more difficult it is for the liquid to “wet” materials. certain additives, for example, water softeners, reduce surface tension, or viscosity and improve wetting properties, allowing the material to flow out more.
wetting agenta substance capable of lowering the surface tension of liquids, facilitating the wetting of solid surfaces and permitting the penetration of liquids into the capillaries.
whitingcalcium carbonate powder of high purity. 
wind (wined)a twisting warp from cutting slabs in the gang saws.
wire meshsee welded-wire fabric.
wire sawmethod of cutting stone by passing a twisted, multistrand wire over the stone and immersing the wire in a slurry of material.
wood floatthe wood float is sometimes used in place of the flat trowel for floating mortar. it is good for smoothing small irregularities left on the mortar bed, working the surface of the mortar before troweling on the pure coat, or compacting floor and deck mortar.
workabilitythe property of freshly mixed concrete or mortar which determines the ease and homogeneity with which it can be mixed, placed, compacted, and finished.
wrinkled sheetspertaining to ceramic mosaics mounted on paper. due primarily to rough handling in shipment.
wythethe inner or outer part of a cavity wall.