Signs Your Concrete Is Sinking — and When to Act
Uneven slabs, trip edges, and pooling water are early warnings. Here’s what makes concrete sink around Houston — and when it’s time to call a pro.
Why concrete sinks in the Houston area
Houston sits on expansive clay that swells when it’s wet and shrinks in a drought, so the ground under a slab is always moving. Add poor original compaction, washout from downspouts or a plumbing leak, and our flood-then-drought cycles, and a slab loses the support it was poured on. When the soil drops, the concrete follows it down.
The warning signs worth a look
Watch for slabs that have tilted or dropped at their control joints, raised “trip edges” between panels, and porch or garage doors that suddenly stick. Water that pools where it used to drain — or a gap opening under a driveway or between a patio and the house — usually means the soil beneath has settled away.
Why a small lip gets expensive
A quarter-inch edge is a stubbed toe today and a liability claim tomorrow. A sunken slab also redirects water toward your foundation and garage instead of away from them, so a cosmetic issue quietly turns into a drainage problem. And the longer a void sits under the slab, the more soil washes into it — the fix only grows.
What a real inspection checks
We measure elevation across the slab, find the low points, and look for the root cause — the soil, the drainage, the void underneath — not just the crack you can see. That tells us whether the answer is a straightforward lift or whether drainage has to be corrected first so the repair actually stays put.
When to call
If you can catch a toe on it, feel a slab shift underfoot, or see water pooling against the house, it’s worth a free look. Caught early, most settlement is a quick raise instead of a tear-out — waiting is what turns it into replacement.
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