House Leveling Boerne, TX.

What the ground under your Boerne slab is actually doing

Drive a few inches down anywhere in Kendall County and you tend to hit rock. The clay that sits between your concrete and that limestone is often only a foot or two thick, but it is highly plastic, it swells hard against footings when the winter rains come and shrinks away from them when a Hill Country summer bakes it dry. Geotechnical reports describe this with a plasticity index, the spread between a soil's liquid and plastic limits, and Boerne's clays commonly land in the moderate-to-high range. Even a modest PI moves enough across one Texas season to bind a door or open a crack.

There is a second, less obvious driver here. Because the rock surface is irregular, soil depth changes sharply across a single lot. One corner of a slab may rest squarely on stone while another spans a pocket of clay several feet deep, so the two corners simply do not move together. Water working through the fractured limestone below adds to it, softening isolated zones and shifting where the real support lies.

The practical takeaway: movement around Boerne is usually a problem of uneven bearing over rock, not deep uniform clay. That distinction changes how a lift has to be planned, and it is why a generic fix borrowed from a different soil region tends to disappoint.

Why we drive past the active zone

The depth where moisture actually changes the soil's volume is called the active zone. On the deep clays toward Austin and San Antonio that zone can run quite deep; here in Boerne it is shallower, often only four to six feet. That sounds reassuring until you realize a pressed-concrete pier that stops near that depth is still sitting inside the moving layer, vulnerable to the exact heave-and-shrink that cracked the foundation in the first place.

GroundLock drives galvanized steel piers hydraulically through the active zone and past the weathered rock interface until they bear on competent, load-bearing strata that does not swell or shrink with rainfall. On sites where rock is extremely shallow, our crews read the hydraulic driving pressure in real time to confirm each pier has reached genuine refusal at solid stone, rather than bottoming out on a fractured ledge that only feels like bearing.

Once the piers are set, we transfer the home's load onto steel and raise it back toward its original elevation in controlled increments. Done patiently, the level holds through the next drought and the next downpour alike.

How a Boerne house leveling job goes

Signs your Boerne foundation is moving differentially

On thin-soil sites these show up early, long before the slab itself cracks visibly. Worth an evaluation if you notice any of them:

• Stair-step cracks climbing through brick or block veneer, often at one corner of the house
• Doors and windows that stick or won't latch seasonally, easing up after a wet spell
• Floors that slope underfoot or feel bouncy, especially over a single room
• Drywall cracks fanning out from the corners of door and window frames
• Gaps opening along baseboards or where the ceiling meets the wall
• Separation between trim and brick at the garage, where cut-and-fill lots often show first

Boerne house leveling questions, answered