Foundation repair Travis County.

Why Austin-area slabs move the way they do

The clays of the Blackland Prairie shrink and swell with the seasons more than almost any soil in Texas. After a rainy stretch they absorb water and lift the perimeter of a slab measurably; through a dry August they contract and leave the edges bearing on air pockets. That cycle is what cracks brick, sticks doors, and separates trim from the ceiling.

The trouble is depth. Around Austin the active zone, the depth over which seasonal moisture changes soil volume, runs 10 to 15 feet, and in heavy clay 20 feet or more. Any pier anchored inside that zone just rides the soil up and down instead of restraining it.

One movement gets misread often: when the clay under the center of a slab stays wet while the perimeter dries, the middle domes upward, a center-lift condition. If interior doors bind and cracks radiate from door corners rather than the corners of the house, that's often the cause, needing a different response than perimeter settlement.

What we look at before recommending anything

A Travis County assessment isn't a walk-around, it's a set of measurements and site conditions that determine the plan:

• Which side of the Balcones Fault you're on, deep expansive clay east of the escarpment versus thin soil over limestone to the west.
• A ±0.01-in. elevation survey across the whole structure, showing exactly where the slab has moved, by how much, and in which direction.
• Perimeter drainage gradient, grade should fall at least 6 inches over the first 10 feet from the house, or moisture pools at the edges.
• Irrigation placement, soaker hoses and sprinkler heads within 18 to 24 inches of the slab can supersaturate edge soil and heave it.
• Nearby trees, live oaks, post oaks, and cedar elms pull moisture well past their drip line, drying the soil under the closest corner.
• Interior versus perimeter cracking, which tells us whether it's settlement, center-lift, or both.

How the repair actually gets done

GroundLock's galvanized steel piers are driven hydraulically through the active zone and terminate in competent load-bearing strata below the seasonal moisture front. In east Travis County that means pushing through deep clay to refusal; along the western limestone corridor it may mean reaching shallow bedrock, but there we verify bearing capacity, not just depth, because rock at the surface doesn't guarantee support underneath.

The elevation survey drives the plan: pier count, spacing, target load, and the lift sequence that eases the slab back toward its original plane without adding new stress. A typical Travis County project runs $4,500 to $14,000, and the free survey locks that number in before you commit. Financing is available, and most homes stay occupied while we work.

We treat the water, not just the slab, lifting a house without correcting the drainage or erosion that dried out the soil simply resets the clock. Our full foundation repair process ends in a lifetime warranty that transfers with the property, so a documented repair becomes a provable asset at closing.

Travis County foundation questions, answered