Drying and Shrinking of the Soil Under the Slab

expansive soil showing shrikage

HVAC (Heating, Venting, and Air Conditioning) systems may be installed beneath the floor slab. Over time, the ductwork can leak air, which can dry out the soil.

As the soil dries and shrinks, gaps form under the floor slab, creating voids. The soil no longer supports the floor slab because the floor begins to crack and sink into the voids.