Concrete Slab Leveling in San Antonio, TX
Raise settled concrete slabs back to grade with precision leveling techniques built for San Antonio's challenging clay soils. Residential and commercial slab repair.
Raising Settled Concrete Back to Grade
Concrete slab leveling is the process of raising a settled slab back to its original elevation without removing and replacing the concrete. The technique works on interior floors, garage slabs, exterior flatwork, and commercial floor systems. In San Antonio, where nearly every home and commercial building sits on a slab-on-grade foundation, this service addresses one of the most common structural issues property owners face.
There are two primary methods for slab leveling: mudjacking and polyurethane foam injection. Mudjacking has been used for decades and involves pumping a cement-based slurry beneath the slab. It works, but the heavy material adds significant weight to soil that may already be failing. Polyurethane foam injection is the newer approach. The foam weighs a fraction of what mudjacking slurry does, cures faster, and can reach areas that thick slurry cannot. For most San Antonio properties, foam injection is the better choice because it lifts without overloading the expansive clay soils common throughout the metro.
Not every slab needs leveling, and not every slab can be leveled. If the concrete is severely broken, crumbling, or has deteriorated beyond structural usefulness, replacement may be the right call. We evaluate each situation honestly and tell you whether leveling will solve the problem or whether you need a different approach. Our goal is a repair that lasts, not one that looks good for a season and then fails.
Signs Your Concrete Slab Has Settled
Slab settling can be subtle at first, but it produces visible and functional symptoms as it progresses. Here are the most common signs we see at San Antonio properties.
Uneven Interior Floors
If you notice that floors slope in one direction, furniture does not sit flat, or a ball rolls to one corner of a room, the slab beneath has likely settled in that area. This is especially common in older San Antonio homes where decades of soil movement have taken a toll on the original slab.
Sticking Doors and Windows
When a slab settles unevenly, it can shift the framing above it just enough to make doors and windows bind in their frames. A door that suddenly will not latch or a window that requires force to open may be a sign of slab movement rather than a simple hardware issue.
Slab Cracks
Cracks that run across the floor surface, especially those that are wider on one end than the other, often indicate differential settling. The slab is bending or breaking as one section drops while adjacent areas stay in place. Hairline cracks from normal curing are different from the wider, directional cracks caused by soil movement.
Gaps Between Walls and Floors
A visible gap at the base of a wall where it meets the floor is a clear sign that the slab has dropped. The wall stays attached to the framing above, which is supported by the perimeter foundation, while the interior slab settles independently. This gap can allow moisture, insects, and outside air to enter the home.
Garage Floor Dropping
Garage slabs are poured on fill soil inside the foundation walls. When that fill compacts or washes out, the garage floor drops away from the walls, creating gaps along the perimeter. You may also notice the floor slopes toward the back of the garage or that the driveway-to-garage transition has become a noticeable step.
How We Level Your Concrete Slab
Inspection and Elevation Mapping
We survey the entire slab using laser levels and measuring tools to create a detailed map of where the concrete has settled and by how much. This map guides our injection plan and ensures we raise each section to the correct elevation rather than simply guessing.
Soil Assessment
We evaluate the soil conditions beneath the slab to understand why the settling occurred. Whether the cause is clay shrinkage, poor compaction of original fill, washout from plumbing leaks, or a combination of factors, understanding the root cause allows us to target our repair and advise on prevention.
Lift to Grade
We drill small injection ports through the slab and pump polyurethane foam into the voids beneath. The foam expands, fills empty spaces, compacts loose soil, and lifts the concrete back to its proper elevation. We monitor the lift in real time to ensure precision and prevent over-raising.
Final Measurements
After the lift is complete, we re-survey the slab to verify that the settled areas now match the surrounding concrete. We patch all injection ports, clean the work area, and walk you through the results. The slab is ready for normal use immediately.
Slab Leveling for San Antonio's Soil and Construction
Nearly every home in the San Antonio metro sits on a slab-on-grade foundation. Unlike pier-and-beam homes common in other parts of Texas, slab homes rest directly on the soil. That means any soil movement translates directly into slab movement. In a city built largely on Houston Black Clay, one of the most expansive soil types in the country, that movement is constant. The clay absorbs water and swells during wet periods, then dries out and shrinks during San Antonio's hot, dry summers. Each cycle opens voids beneath the slab, and the concrete gradually settles into those gaps.
In older neighborhoods like Alamo Heights, Terrell Hills, Olmos Park, and Monte Vista, homes built in the 1940s through 1970s have endured decades of these soil cycles. Interior slab settling in these homes is common and often shows up as sloping floors, sticky doors, and cracks in tile or drywall. Because these homes have historic character and the owners want to preserve them, slab leveling offers a way to correct the settling without major demolition or disruption to the home's original features.
Newer developments in Cibolo, Schertz, New Braunfels, and along the Loop 1604 corridor face a different but related problem. Many of these communities were built on land that was graded and filled before construction. If the fill material was not compacted in proper lifts, it settles in the first five to ten years after the home is built. We regularly work on homes in these areas that are only a few years old but already showing signs of interior slab settling. Catching it early with leveling prevents the problem from progressing to a point where more invasive foundation work becomes necessary.
Concrete Slab Leveling FAQ
Common signs include uneven or sloping floors, doors and windows that stick or will not close properly, cracks in walls near corners or above doorframes, visible gaps between the floor and baseboards, and cracks in the slab itself. If you place a ball on the floor and it rolls to one side, that area has likely settled. We offer free inspections to measure the extent of any settling.
Slab leveling typically costs 50 to 70 percent less than replacing the concrete entirely. The exact price depends on the area being leveled, the degree of settling, and the method used. Interior slab leveling costs vary based on flooring that may need to be removed and replaced. We provide free on-site estimates with transparent pricing so you know the full cost before work begins.
Yes. Slab leveling is minimally invasive. The equipment is set up outside, and the injection ports drilled through the floor are small. There is no heavy demolition, no concrete trucks, and no extended cure time. Most homeowners stay in their homes throughout the process and resume normal activities the same day. We take care to protect your flooring, furniture, and belongings during the work.
When performed correctly and paired with proper drainage, a slab leveling repair can last for many years. The polyurethane foam used in the process does not break down, wash out, or compress under load. The biggest variable in San Antonio is ongoing soil movement from expansive clay. We address the immediate voids and recommend drainage improvements to reduce future moisture-related soil changes that could cause new settling.
Slab leveling raises the concrete surface back to grade by filling voids beneath it with foam or other material. Foundation repair involves installing structural supports like steel piers or concrete piers driven deep into stable soil or bedrock to permanently support the foundation. Slab leveling is appropriate for surface settling and minor interior slab drops. Foundation repair is needed when there is structural movement affecting the entire home. In some cases, both are needed. We can help determine which approach fits your situation during a free inspection.
Related Services
Concrete Slab Leveling Across the San Antonio Metro
We provide concrete slab leveling services throughout the San Antonio metro area, from established neighborhoods near downtown to newer developments along Loop 1604 and beyond.
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