Why Does Concrete Sink in North Texas?

If your driveway or patio is settling in Plano, you're experiencing one of the most common homeowner headaches in North Texas. The culprit, in most cases, is right under your feet: expansive clay soil.

Texas Clay: The Main Cause

Much of the Dallas-Fort Worth metroplex — including Plano, Frisco, McKinney, and Allen — sits on expansive clay. This soil swells dramatically when wet and shrinks when dry. North Texas weather gives it plenty of both: long dry spells followed by heavy rain.

Each swell-shrink cycle moves the ground under your concrete. Over years, the soil compacts unevenly, voids open up beneath slabs, and sections of driveway, sidewalk, patio, or pool deck drop. It's not a flaw in your concrete — it's the ground moving underneath it.

Other Common Contributors

• Poor drainage. Downspouts dumping next to the slab, or grading that slopes toward concrete, wash soil out from underneath over time.
• Plumbing leaks. A slow leak under or near a slab erodes supporting soil silently for months.
• Tree roots. Large trees near concrete draw moisture from the soil (shrinking it) and physically displace it.
• Poor compaction during construction. If the base under a slab wasn't properly compacted when it was poured, settlement starts early.
• Drought cycles. Extended dry periods shrink clay dramatically — the 2022–2023 Texas drought caused a visible wave of new settlement across DFW.

Why Leveling Makes Sense Here

Because the soil is the problem — not the slab — simply pouring new concrete often just resets the clock. Fresh concrete over the same expansive clay can begin settling again within a few years.

Leveling takes a different approach: it fills the voids the soil left behind and restores support under your existing slab. Polyurethane foam goes a step further — it's waterproof, so it resists the washout that undermines cement-based fills, and at 2–4 pounds per cubic foot it adds almost no new weight to already-stressed soil.

How to Slow Future Settlement

• Keep gutters clean and extend downspouts at least 4–6 feet from slabs and foundations.
• Grade soil so water flows away from concrete, not toward it.
• During droughts, water the soil around (not under) slabs moderately to reduce extreme shrinkage — many DFW homeowners run soaker hoses in dry months.
• Fix plumbing leaks promptly; don't let water run under concrete unnoticed.
• Address small settlement early — a half-inch drop is a far cheaper fix than a three-inch one.