will absorb no more than 16 percent of its weightof water have never given unsatisfactory perform-ance in resisting the effect of freezing andthawing action.Only portland cement-limemortar or mortar prepared from masonry cementshould be used if the masonry is exposed to theweather.Walls containing structural clay tile havebetter heat-insulating qualities than walls com-posed of solid units because of the dead air spacethat exists in tile walls. The resistance to soundpenetration of this type of masonry comparesfavorably with the resistance of solid masonrywalls, but it is somewhat less.The fire resistance of tile walls is considerablyless than the fire resistance of solid masonry walls.It can be improved by applying a coat of plasterto the surface of the wall. Partition walls ofstructural clay tile 6 in, thick will resist a fire for1 hr provided the fire produces a temperature ofnot more than 1700°F.The solid material in structural clay tile weighsabout 125 lb per cubic foot. Since the tilecontains hollow cells of various sizes, the weightof the tile varies, depending upon the manu-facturer and type. A 6-in. tile wall weighsapproximately 30 lb per square foot, while a 12-in.tile weighs approximately 45 lb per square foot.Uses for Structural Clay TileStructural clay tile may be used for exteriorwalls of either the load-bearing or nonload-bearing type. It is suitable for both below-gradeand above-grade construction.Structural load-bearing tile is made from 4-to 12-in. thicknesses with various face dimensions.The use of these tiles is restricted by buildingcodes and specifications, so consult the projectspecification.Nonload-bearing partition walls from the4- to 12-in. thicknesses are frequently made ofstructural clay tile. These walls are easily built,light in weight, and have good heat- and sound-insulating properties.Figure 7-45 shows the use of structural claytile as a back unit for a brick wall.Figure 7-46 shows the use of 8- by 5- by 12-in.tile in wall construction. Exposure of the open endof the tile can be avoided by the application ofa thin tile called a SOAP at the corner.Figure 7-45.-Structural tile used as a backing for bricks.Figure 7-46.-Eight-inch structural clay tile wall.STONE MASONRYStone masonry is masonry is which the unitsconsist of natural stone. In RUBBLE stonemasonry, the stones are left in their natural state,without any kind of shaping. In ASHLARmasonry, the faces of stones that are to beplaced in surface positions are squared so that thesurfaces of the finished structure will be more orless continuous plane surfaces. Both rubble andashlar work may be either RANDOM orCOURSED.Random rubble is the crudest of all types ofstonework. Little attention is paid to laying the7-29
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business