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Foundation Repair Methods
Not all foundation problems are solved the same way. Here's how each repair method works, when it's the right choice, and what makes San Antonio's soil conditions relevant to that decision.
At a glance
Pressed Concrete Piers
Slab foundation settlement in clay soils
Steel Push Piers
Heavily loaded foundation sections (multi-story, commercial)
Helical Piers
New construction additions and room additions
Carbon Fiber Wall Straps
Inward-bowing stem walls or basement walls
Polyurethane Slab Lifting
Settled driveways, sidewalks, pool decks, and garage floors
| Method | Best For | Timeframe | Disruption | Permanence |
|---|---|---|---|---|
| Pressed Concrete Piers | Slab foundation settlement in clay soils | 1–2 days | Low | High |
| Steel Push Piers | Heavily loaded foundation sections (multi-story, commercial) | 1–3 days | Medium | High |
| Helical Piers | New construction additions and room additions | 1–2 days | Low | High |
| Carbon Fiber Wall Straps | Inward-bowing stem walls or basement walls | Half to full day | Low | High |
| Polyurethane Slab Lifting | Settled driveways, sidewalks, pool decks, and garage floors | 2–4 hours | Low | Medium |
Pressed Concrete Piers
4-inch cylinders hydraulically driven to bearing strata — the Texas standard for slab settlement.
How it works
A hydraulic ram pushes pre-cast 4-inch concrete cylinders one section at a time through the soil until the pile reaches load-bearing strata and the surface gauge shows refusal. Multiple cylinders are stacked to reach the required depth — typically 10 to 20 feet in Bexar County. Once all piers at a given foundation section are set, a lift ram raises the slab to optimal elevation, brackets lock the pier head in place, and the excavation is backfilled and compacted.
In San Antonio
Pressed concrete piers are by far the most widely used foundation repair method across San Antonio and the surrounding Hill Country fringe. The Blackland Prairie clay and Austin Chalk geology that dominate Bexar County creates ideal conditions for this pier type — the dense clay and shallow chalk provide consistent refusal depths that keep installation times predictable. Thousands of homes in neighborhoods like Stone Oak, Helotes, and the Southside have been successfully repaired with pressed concrete systems over the past 30 years.
Best for
- Slab foundation settlement in clay soils
- Accessible perimeter and interior locations
- Budget-conscious repairs needing proven performance
Not ideal for
- Extremely deep bearing strata (50+ feet)
- Sites with very soft near-surface soils that won't provide adequate pier alignment
Advantages
- + Lower material cost than steel pier alternatives
- + Faster installation — most jobs complete in one to two days
- + Decades of performance history in San Antonio's specific geology
- + No curing time — foundation can bear load immediately after installation
Limitations
- − Depth limited by soil resistance — not suitable for sites with very deep bearing strata
- − Concrete cylinders can crack under extreme lateral soil movement if drainage issues are not corrected
- − Requires adequate access around the foundation perimeter for equipment
Steel Push Piers
Galvanized steel pipe sections driven to bedrock or dense bearing strata for heavy loads or deep geology.
How it works
Bracketed steel drive sleeves are secured to the foundation footing. A hydraulic ram drives galvanized steel pipe sections — typically 2.875-inch diameter — end-to-end through the soil until the system reaches bedrock or dense bearing material and the drive force exceeds a specified resistance threshold. The bracket assembly then locks the pier head, and synchronized hydraulic lifting jacks the foundation back toward original elevation.
In San Antonio
Steel push piers are used selectively in San Antonio on sites where the Austin Chalk lies deep or where the structure is heavy enough to develop the drive force needed. They're common on two-story masonry homes in older Alamo Heights and Terrell Hills neighborhoods, where the combination of heavy brick construction and significant settlement makes the higher lift capacity of steel piers necessary.
Best for
- Heavily loaded foundation sections (multi-story, commercial)
- Sites where bearing strata is very deep
- When maximum lift capacity is required for raising severely settled sections
Not ideal for
- Tight access situations where equipment cannot maneuver
- Lightweight structures where the dead load is insufficient to drive the pier
Advantages
- + Can reach much deeper bearing strata than pressed concrete piers
- + Higher lift capacity for severely settled sections
- + Galvanized steel resists corrosion in wet soil conditions
- + Depth verified by drive force monitoring — documented to bearing capacity
Limitations
- − Higher material and installation cost than pressed concrete piers
- − Requires adequate structure dead load to drive the pier — not suitable for light wood-frame construction
- − Installation takes longer per pier due to driving time
Helical Piers
Steel shafts with helical bearing plates screwed into load-bearing strata — best where access is tight or loads are light.
How it works
A hydraulic torque motor rotates a steel shaft tipped with one or more helical bearing plates into the soil — the same principle as a giant screw. Shaft sections are added as the lead section advances until it reaches load-bearing strata, at which point installation torque correlates directly to bearing capacity. Because helical piers are screwed rather than driven, they can be installed with compact equipment through doorways or in confined crawl spaces, and they carry load immediately without needing to mobilize the structure's dead weight.
In San Antonio
Helical piers are the preferred choice for interior pier-and-beam foundation repairs in San Antonio's older neighborhoods like Dignowity Hill, Highland Park, and Monte Vista, where slab construction isn't present and pier-and-beam access allows interior installation without exterior excavation. They're also the go-to solution when homeowners are adding a room addition or garage conversion and the new footing needs underpinning before loads are applied.
Best for
- New construction additions and room additions
- Interior pier installation without excavation
- Sites with restricted equipment access
- Wet or recently disturbed soils where driven piers may not reach refusal
Not ideal for
- Extensive perimeter settlement requiring many piers — cost becomes prohibitive
- Rocky soils where helical plates cannot advance
Advantages
- + Can be installed in restricted access locations including indoors
- + Immediate load-bearing capacity — no curing or waiting
- + Works in wet or recently disturbed soil conditions
- + Installation torque provides real-time bearing capacity verification
Limitations
- − Higher cost per pier than pressed concrete
- − Helical plates cannot advance through boulders or caliche hardpan without modification
- − Requires specialized installation equipment and trained operators
Carbon Fiber Wall Straps
High-tensile fiber reinforcement bonded to bowing foundation walls — stabilizes without excavation.
How it works
The foundation wall surface is ground smooth at the strap locations, and a high-modulus carbon fiber strap — the same material used in aerospace applications — is bonded to the wall using structural epoxy. The strap runs from the footing to the floor framing above, transferring the load of the bowing wall to the rigid structural elements at top and bottom. The result is immediate lateral stabilization with no exterior excavation required.
In San Antonio
Bowing stem walls appear most often in San Antonio's pier-and-beam homes built before 1970, particularly where drainage toward the foundation has saturated the soil over decades. Neighborhoods like King William, Prospect Hill, and parts of the Westside have significant older pier-and-beam stock where carbon fiber straps are a practical, minimally invasive solution that avoids excavating through mature landscaping.
Best for
- Inward-bowing stem walls or basement walls
- Cracking along mortar joints in block or brick foundation walls
- Preventing further wall rotation when the wall has moved less than 2 inches
Not ideal for
- Lifting or re-leveling a settled slab or footing — straps stabilize only, they do not lift
- Walls that have moved more than 2 inches and require reset
Advantages
- + No excavation required — entire installation is from inside
- + Immediate stabilization — epoxy cures fully within 24 hours
- + Does not alter exterior appearance or disturb landscaping
- + Extremely thin profile — carbon fiber adds less than 1/4 inch to wall surface
Limitations
- − Stabilizes only — does not reset or push a bowed wall back toward plumb
- − Requires clean, sound concrete or masonry surface for epoxy bond
- − Not a solution for slab settlement or footing underpinning
Polyurethane Slab Lifting
Two-part expanding foam injected under settled concrete — best for driveways, sidewalks, and garage slabs.
How it works
Small holes (typically 5/8 inch) are drilled through the settled slab at strategic locations. A two-part polyurethane foam is injected through the holes — it flows into the void beneath the slab and then expands rapidly, filling the space and exerting upward pressure that lifts the slab back toward its original elevation. The foam cures in 15 minutes and the holes are patched. The slab can bear full load within the hour.
In San Antonio
San Antonio's intense summer heat and prolonged droughts cause clay soils to shrink and pull away from slab edges, creating voids under driveways and flatwork that cause slab panels to drop at joints. Polyurethane lifting is a practical option for these non-structural applications — it is not a substitute for pier underpinning on a structural foundation, but it is an effective and affordable way to level a settled driveway or garage slab panel.
Best for
- Settled driveways, sidewalks, pool decks, and garage floors
- Slab sections with uniform settlement under a single area
- Situations requiring minimal disruption and fast return to use
Not ideal for
- Structural foundation settlement requiring permanent underpinning
- Expansive clay soils where void formation is ongoing — foam fills the current void but does not prevent re-settlement as the clay continues to shrink and swell
Advantages
- + Fast — most jobs done in a few hours with immediate use after curing
- + Less invasive than full slab replacement
- + More durable than traditional mudjacking in wet conditions (foam doesn't wash out)
- + Minimal cosmetic impact from small injection holes
Limitations
- − Not a structural repair — does not address soil instability or ongoing clay movement
- − Foam does not bond soil or stabilize subgrade for long-term reliability in expansive clay
- − Cost-competitive with replacement for small areas — not always the most economical choice
Free inspection · San Antonio, TX
The right method starts with the right diagnosis.
Every repair recommendation we make is based on a full elevation survey and site assessment — not a guess. Call for a free inspection and we'll tell you exactly what you're dealing with.
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