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<br /> <br /> <br />SvvellingSoiIs <br /> <br />SwELL I NG SO I LS are 50 i 15 or sof t bedrock wh 1 ch 1 ncrease in <br />volume as they get wet and shrink as they dry out. They are <br />a I so common I y known as benton i ta, expans i va, or montmor i I- <br />1 i nit i C 50 i I 5 . <br /> <br /> <br />o 0 <br /> <br /> <br /> <br />>, <br />.~~1~ <br /> <br />. -~ <br /> <br /> <br /> <br />;!?; <br /><~:4~~};' <br /> <br /> <br />.~ <br />!(:~rfF <br /> <br />"'Q.1itI!:A-r~.,. a . "/- <br />- - ~ _=.~.~N:'~_~~_'<___ -=--__- <br /> <br />....SLI6H1'L.V .. <br />E><:J>A"-U'E:P c...IJ,.y <br /> <br />- - - --- -- - - - - --, <br /> <br />The two drawings on the left illustrate improper design, construction, <br />landscaping, and maintenance on swelling sol Is with the resulting damage to the <br />house. On the right, no damage is experienced from swelling soi Is. Even with <br />proper methods, some movement of the floating floor slabs should be anticipated <br />as shown because of natura I 1 ncreases in mol sture under the structure. The <br />positive surface drainage, landscaping, impermeable barriers, subsurface drains <br />and other measures wi II act to minimize the movement of the floating slab. <br /> <br />37 <br />