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Soil & Science

Why Texas Foundations Crack

Texas foundations crack for a specific, repeatable reason: expansive clay caught between brutal droughts and sudden downpours. Here’s the full picture.

The perfect storm

Clay that changes volume, a climate that swings from drought to flood, and slabs poured right on top — the result is seasonal movement built into the ground itself.

droughtrainClay swells when wet, shrinks when dry — the slab rides it
ANIMATION · Drought-to-rain cycleLoops

It isn’t bad building

Even well-built homes move on this soil. That’s why steel piers bypass the clay instead of fighting it.

TopsoilExpansive clay — swells & shrinksLoad-bearing stratum
FIG · Expansive clay cross-sectionN.T.S.

Managing it

Drainage, foundation watering, and early measurement keep movement in check. See the seasonal cycle.

Key takeaways
  • Clay + drought + rain = built-in movement.
  • Even good construction moves on this soil.
  • Drainage and early measurement manage it.
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Frequently asked

Is it my builder’s fault?
Usually not — the soil drives movement regardless of build quality.
Do newer homes crack too?
Yes; new slabs on expansive clay move just like older ones.
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