Why Foundations Crack in Clay Soil

The Soil Under Burleson Homes

Much of the Burleson area sits on expansive clay soil. This kind of soil behaves very differently from sand or gravel: it absorbs water and swells when wet, then shrinks and pulls away as it dries out.

The Wet and Dry Cycle

Burleson’s climate — hot summers, sudden storms, and dry stretches — pushes clay soil through repeated moisture swings. After heavy rain, the soil expands and lifts against the foundation. During a drought, it shrinks and leaves gaps.

This constant back-and-forth is the leading cause of foundation movement in the region. A foundation is rigid, so when the soil moves unevenly beneath it, stress builds up until something gives — usually in the form of cracks.

Where Cracks Show Up

• Stair-step cracks in brick or block walls
• Vertical or diagonal cracks in interior walls
• Cracks in a concrete slab
• Gaps around doors and windows

What Helps

Managing moisture is a big part of the picture. Good drainage keeps water from pooling against the house, and consistent soil moisture during droughts reduces sharp shrinking. When movement has already occurred, an inspection can show whether repair is needed.

If you are seeing cracks that seem to be growing, it is worth having your foundation looked at before the movement progresses.