Throughout the State of California, there are numerous areas that contain highly expansive clays in the soil. These soils have the capability of absorbing water, thereby expanding the soil. The expansion of these clay materials can cause significant vertical displacement known as heave, even of residential homes. Our firm has seen homes move as much as 6 to 8 inches as a result. Additionally, if the clay soils are saturated and then allowed to dry out, considerable shrinkage or consolidation will result. We have seen significant damage to residential and commercial properties as a result of both heaving and settling caused by expansive clay.