East Bexar

Foundation repair Kirby, TX.

Kirby is small enough to drive across in a couple of minutes, but the Salado Creek terrace clay underneath it moves like the rest of East Bexar. We anchor your slab to stable ground with galvanized steel piers, measured, engineer-backed, and warrantied for life.

Engineer-backedSame-week inspectionsLifetime warranty

Signs a Kirby slab is on the move

These are the symptoms we get called out for most often within Kirby's older east-side neighborhoods:

Diagonal cracks running off the upper corners of door and window frames
A door that latched fine last winter but now drags or won't catch in late summer
Stair-step separation in exterior brick or block, sometimes only on one side of the house
Floors that feel like they tilt toward one room, or a spot near an exterior wall that gives slightly underfoot
Gaps opening where the wall meets the ceiling or where trim pulls away from the drywall
Tile grout splitting or a hairline crack tracking across the slab near a perimeter wall

The Salado Creek terrace under your feet

Kirby sits on old Salado Creek terrace deposits, clay that flood after flood laid down in uneven layers over thousands of years. That history matters more than it sounds. Unlike the steadier Blackland Prairie clays farther east, terrace soil varies from one part of a lot to the next, so the clay can be thick and thirsty under one corner of a house and thinner under another.

That lateral variability is exactly why so many Kirby homeowners describe cracks on one side of the structure while the other side looks untouched. The clay is high-plasticity smectite, plasticity index commonly in the 40 to 60 range or above, and when it dries through a Central Texas summer it shrinks and pulls away from your footings; when the rain returns it swells back with real force. A slab cast on top of that simply rides the difference.

The seasonal moisture swing reaches down roughly 8 to 12 feet here. That depth is the active zone, and any support that stops inside it is still anchored to ground that moves. It's the reason a shallow pressed-concrete pier can feel like a fix for a year or two and then let the foundation drift again.

Why we drive steel past the active zone

Our fix for Kirby slabs is hydraulically driven galvanized steel piers, advanced segment by segment until they hit load-bearing refusal well below that 8-to-12-foot active zone. Because each pier is pushed using the weight of your own house, the install hydraulics confirm in real time that it has reached competent material instead of just stopping at a number on a chart.

No concrete goes in below grade, so there's no cure time and nothing that disturbs the surrounding clay as it sets. What you end up with is a direct, measurable link between your structure and a stratum that doesn't care what the weather did this season. That's also why we install steel piers rather than the pressed or hybrid systems that tend to terminate inside the moving zone.

Most Kirby projects land between $4,500 and $14,000, driven by how many piers the slab needs and how reachable the work area is. The lifetime warranty on that stabilization transfers to the next owner, a clean line item to point to when you sell. Financing is available, and in nearly every case you and your family stay in the house while the crew works.

How a Kirby repair actually goes

Free elevation survey

We map your slab to plus or minus 0.01 in. (1/64 in.) across the perimeter and interior load-bearing grid, then hand you a contour of exactly where it has settled.

Engineer-backed plan

That survey sets the pier count and spacing in writing, no guessing from where the cracks happen to show, so you see the scope and price before committing to anything.

Drive and lift

Galvanized piers go down to refusal on the plan, then we lift the slab back toward level and transfer the load onto steel instead of soil.

Protect and close out

Where water is feeding the problem we address grading and drainage, then close the job under the lifetime transferable warranty.

Kirby foundation questions, answered

I'm right in the middle of San Antonio's east side, do you actually cover Kirby?

We do. Kirby is squarely in our East Bexar service area, and we run engineer-backed steel-pier slab repair throughout the city, free survey and lifetime transferable warranty included.

Cracks showed up on one side of my house but not the other, is that normal here?

It's very common in Kirby. The Salado Creek terrace clay varies in thickness and plasticity across a single lot, so one corner can dry and shrink harder than another. That uneven movement is the classic terrace signature, and the elevation survey shows exactly where it's happening.

How deep do the piers actually go?

Past the active zone, which runs about 8 to 12 feet down around here. We drive each galvanized pier to load-bearing refusal using your home's own weight, so the depth is whatever it takes to reach stable material rather than a fixed length.

Why not just use the concrete piers another company quoted me?

Pressed-concrete and hybrid piers often stop inside that 8-to-12-foot moving zone, which is why they can work for a year and then let the slab shift again. Steel driven to refusal below the active clay is what gives a lasting fix on terrace soil.

What's a Kirby project likely to cost me?

Most run between $4,500 and $14,000. The number comes from pier count, access, and any drainage work, and your free survey nails down a measured scope before you ever see a price.

Should I be watering around the slab during the summer?

In a hard drought, yes. A drip line or soaker run evenly around the house keeps the terrace clay from pulling away and settling. Keep it about 12 to 18 inches off the stem wall so you're not overwatering right against the slab.

My yard is flat and water pools by the house, does that matter?

It matters a lot on this soil. You want the grade dropping about 6 inches over the first 10 feet away from the foundation so runoff heads away from the clay carrying your footing loads. If grading alone won't do it, we can pair the repair with drainage work.

Will my sticking doors work again once you lift the slab?

Usually yes. As the slab comes back toward level, racked door and window openings tend to free up, sometimes during the lift itself.

Do we have to move out while you work?

Almost never. The work happens from outside the slab, and most Kirby families stay in the house and keep using it the whole time.

Does the warranty really pass to the next owner if I sell?

Yes. The steel-pier stabilization carries a lifetime warranty that transfers with the home, which is a genuine asset to put in front of a buyer and on the disclosure.

Kirby services

What we do in Kirby

Every job starts with the same free elevation survey. These pages cover what each repair involves on Kirby soil, what it costs, and how long it takes.