The volume of expansive soil is always changing. When the clay-rich soil absorbs moisture, its volume increases. When it dries out, there’s a decrease in volume. This movement in the ground puts a lot of stress on a foundation (all foundation types are susceptible to expansive soil) and can cause differential settlement leading to significant structural damage. In some cases with a crawlspace foundation. You may notice sloping floors, this is due to the post and piers moving with the expansive soil. We offer solutions that are Galvanized Screw Jacks that are adjustable and in some cases depending on the structural severity of the foundation we may need to install Galvanized Steel Push Piers in the areas affected by the expansive soil. In areas of the US where basement foundations are common, expansive soil can also lead to bowed or cracked basement walls.