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<br /> <br />S\\€lIing Soils <br /> <br />SWELLING SOILS are sol Is or soft bedrock which increase in <br />vol urns as they get wet and shrink as they dry out. They are <br />also commonly known as bentonite, expansive, or montmori I- <br />I j nit i c so i I 5 . <br /> <br /> <br /> <br />o <br /> <br />---\~' <br />---"." <br /> <br />-- - - ~ <br /> <br /> <br />...a:tt....,L..y tJ. . >",- <br />...._~="'Ar-4D.El> c...~Y_ _--.-::-:-~_ <br /> <br /> <br />, <br />14.-"- <br />../- <br /> <br /> <br />$~p- <br />;/'.~_f:" <br />.--- <br /> <br /> <br />~~ <br />::i!i::", <br /> <br /> <br />~y <br /> <br />The two drawings on the left illustrate improper design, construction, <br />landscaping, and maintenance on swat ling sol 15 with the resulting damage to the <br />house. On the right, no damage Is exper j anced from swe I ling so i Is. Even with <br />proper methods, some movement of the floating floor slabs should be anticipated <br />as shown because of natural increases in moisture 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 />