Steel pier foundation repair in San Antonio, TX.

Common foundation problems in San Antonio

Across Bexar County we see the same pattern again and again: homes built on expansive clay that have ridden one too many drought-and-rain cycles. The most common signs San Antonio homeowners call us about are:

• Stair-step cracks in brick and mortar, especially on 1960s–80s South and East Side homes
• Interior doors that stick in summer and free up after rain
• Drywall cracks fanning out from window and door corners
• Sloping or springy floors in additions and over crawl transitions
• Separation between brick and window frames, fascia, or the garage

Why slab foundations move in San Antonio

Most of San Antonio is underlain by the Houston Black and Tinn clay series — dark, highly plastic soils that can change volume dramatically with moisture. In a typical year the city swings from saturated spring storms to a hard summer drought, and the clay swells then shrinks beneath the slab. North of the Balcones Escarpment, shallow soils over limestone create the opposite issue: isolated settlement where bearing is uneven. In both cases, a slab cast on that ground has no choice but to move with it.

Why GroundLock uses steel piers for slab repair

Steel piers are engineered for exactly this soil. We hydraulically drive galvanized steel sections through the active clay until they reach refusal in a stable, load-bearing stratum — often 12 to 30+ feet down, well below where San Antonio’s seasonal moisture reaches. Your home’s weight then transfers onto the steel, isolated from the clay. Because pressed-concrete and hybrid piers frequently stop inside that active zone, GroundLock installs steel piers exclusively for San Antonio slab repair.

Signs you may need foundation repair

• Cracks wider than ⅛ inch, or that keep growing
• Doors and windows that won’t latch or have visibly racked
• A floor that slopes enough to feel underfoot
• Gaps at the top of interior walls or between trim and ceiling
• Cracks in the slab, garage floor, or exterior masonry

Our inspection & elevation survey process

Every San Antonio project starts with a free, no-obligation elevation survey. Using a digital manometer, our inspector maps your slab to within ±⅛ inch, identifies the high and low points, and walks you through a written report. You see the actual movement — no scare tactics, no guesswork — and a clear recommendation.

Steel pier installation process

Drainage, grading & moisture control

In San Antonio’s clay, the fastest way to undo a good repair is to let water keep collecting against the slab. Where it matters, we pair stabilization with drainage correction — French drains, downspout extensions, regrading — and erosion control to hold the soil. We recommend it only when it protects your foundation.

San Antonio neighborhoods & nearby areas served

We work across all of San Antonio and the surrounding Bexar County communities, including:

Nearby: New Braunfels, San Marcos, and the rest of the Bexar County corridor.

Warranty & financing

• Lifetime transferable warranty on steel-pier stabilization — it passes to the next owner of your San Antonio home.
• Financing available with plans from $0 down on approved credit, so a permanent fix fits your budget.
• Engineer-backed documentation — the report lenders, buyers, and insurers ask for.

San Antonio steel pier FAQs