Foundation Underpinning Schertz, TX.
Along the Cibolo Creek corridor, Schertz sits on some of the most active Blackland clay in Central Texas. When a slab starts dropping into that moving soil, underpinning is what stops it, by reaching past the clay to strata that holds still.
How underpinning actually corrects a settled Schertz foundation
Measure the whole footprint first
A free elevation survey accurate to ±0.01 in. (1/64 in.) maps every low corner and interior valley, so we know whether the house has settled, heaved, or both before anyone lifts a beam.
Drive galvanized steel piers past the active clay
Each pier is pushed hydraulically through the Houston Black clay and into competent load-bearing strata, deep enough that seasonal wetting no longer moves it.
Load-test every pier as it goes in
Because piers are driven under hydraulic pressure until they hit real resistance, termination depth self-calibrates to what's actually under your lot, not an assumed number off a soil map.
Lift the structure back to grade
With the pier columns set, we raise the foundation against them in a controlled sequence, closing cracks and returning doors and windows to square.
Why the clay under Schertz makes this necessary
The soil doing the damage here is Houston Black, a Blackland Prairie clay with a plasticity index that commonly lands in the 40 to 60 range. That number is a measure of how much water the clay can take on and give up, and in Schertz it's high enough to move a foundation several inches over a single wet-to-dry swing. A wet spring swells the ground upward; a dry Central Texas summer shrinks and cracks it back down. Your slab was engineered to sit still through all of that, and eventually it can't.
Underpinning doesn't try to out-argue the clay. It bypasses it. The near-surface soil along the creek corridor is where all the volume change happens, the active zone, several feet deep, where each wetting front reaches. Steel piers pass straight through that layer and land on material below it, where the moisture equilibrium stays flat year-round. This is also why pressed-concrete piers often disappoint on Schertz lots: they can stop short inside the moving soil and ride it right back up.
Not every crack means the house needs piers, though. Some perimeter movement is pure edge heave driven by irrigation and poor drainage, and it responds to managing water around the foundation, not to underpinning. Telling those two patterns apart is the entire point of measuring before we quote, and it's why a settled house and a heaved one get very different plans.
The survey decides the diagnosis
A settled foundation reads as low corners and interior valleys. A heaved one reads as raised edges with the center near original grade. Only the first calls for underpinning, the second usually needs a different fix entirely.
Getting that read right before any work starts is the single most important step, which is why the elevation survey comes first and comes free.
What protects a Schertz pier repair for the long haul
Underpinning fixes the structure, but the soil around it keeps cycling. A few habits keep the repair holding:
- Grade for drainage, aim for at least 6 inches of fall over the first 10 feet away from the foundation to keep water out of the active clay zone.
- Set irrigation back, keep spray heads and drip emitters 18 to 24 inches off the foundation so watering doesn't re-start the wetting cycles that caused the movement.
- Trust the galvanizing, hot-dip galvanized steel stands up to the corrosive, wet-dry chemistry of the Cibolo Creek soil profiles at depth.
- Keep the written scope. Every installation comes with an engineer-backed plan specifying pier locations, not a verbal estimate.
- Hold onto the warranty paperwork, the lifetime warranty is transferable and travels with the house, which matters at resale in this market.
- Watch drainage and erosion around the slab after the work, especially through the first wet season.
Schertz underpinning questions we hear most
What will underpinning my Schertz house actually run?
Do you underpin homes in my part of Schertz?
Why steel piers instead of concrete on Blackland clay?
Will we have to move out during the repair?
Does homeowners insurance pay for this?
Is the free inspection really free, or is there a catch?
How do I know if my cracks are serious or just normal for this soil?
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All foundation services in Schertz
Every GroundLock service, available throughout Schertz and the surrounding area:
Get your free foundation inspection.
A licensed inspector measures your slab elevation to ±0.01 in. (1/64 in.) and gives you a written, engineer-backed plan with zero pressure.