Expansive soils are a type of soil that is characterized by its swelling clay minerals. The minerals themselves can be likened to a thin plate that tends to behave like a sponge. As the moisture content in the clayey soils rises, the minerals within the clay molecules expand. The opposite effect is also true, as the molecules begin to dry they shrink. The active shrinking and swelling of the clay minerals can cause differential settlement, which can, in some cases, be very costly. (ASTM D1557 is the testing authority for expansive soils and its related plasticity index as it pertains to the Uniform Building Code.)
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About C.e. Schultz
C.e. Schultz is the CEO of CeS Inspections LLC, a Houston based Commercial and Residential inspection company. Avid coffee drinker and former Army Ranger, C.e. Schultz brings an especially unique approach to today's home building industry.