Slab Void Fill & Mudjacking in Jersey Village, TX
Jersey Village Foundation Repair Pros fills voids beneath settled concrete and lifts sunken slabs across Jersey Village and the greater Houston metro, using injected polyurethane rather than traditional cement slurry. A void is the empty space left when clay soil shrinks or washes out from under a slab that has not yet dropped to follow it, and it is one of the most common findings on our elevation surveys.
Houston's expansive clay creates these gaps on a seasonal cycle. Soil swells through a wet spring, holds the slab up, then shrinks through a drought summer and pulls away underneath. The concrete spans the gap until something loads it, and then it cracks or drops suddenly. Filling that space early is considerably cheaper than piering the slab after it has failed.
Void Fill & Slab Lifting Services
Interior Slab Void Fill
Polyurethane injection beneath living-area slabs where the elevation survey and probe testing confirm unsupported concrete.
Garage Floor Lifting
Correction of sunken and stepped garage slabs, including the apron joint where the floor meets the driveway.
Driveway & Walkway Leveling
Lifting of tripped, tilted, or separated exterior concrete back to grade without demolition or replacement.
Patio & Pool Deck Correction
Re-leveling of settled patio and deck sections, with attention to slopes that were draining water toward the house.
Soil Stabilization Injection
Deeper-set injection that densifies weak soil below the slab rather than only filling the gap above it.
Void Fill After Piering
Filling the gaps that remain under a slab interior once perimeter piers have restored elevation at the edges.
How Voids Form Under Houston Slabs
Three mechanisms account for nearly every void we fill in this area. The first is clay shrinkage: soil that swelled with moisture gives that volume back as it dries, and the surface it was supporting drops away from the concrete. The second is erosion, where roof runoff, a leaking supply line, or a poorly graded lot moves fine soil out from under the slab edge and carries it away. The third is consolidation of poorly compacted fill, which shows up most often under additions, converted patios, and slabs poured over trenched utility lines.
Each mechanism calls for different follow-up work. Shrinkage voids point toward moisture management around the perimeter. Erosion voids mean the water source has to be found and corrected or the gap simply reopens. Consolidation voids are usually one-time events that stabilize once filled. Identifying which one you have is the difference between a repair that holds and a repair you pay for twice.
Our Void Fill Process
- Full interior elevation survey recorded on a numbered floor grid, establishing where the slab actually sits
- Acoustic sounding and probe testing to map the void's footprint and approximate depth
- Moisture and drainage assessment around the perimeter to identify the mechanism behind the gap
- Injection port layout on a grid sized to the void, typically at five-eighths of an inch
- Controlled polyurethane injection monitored with laser levels so lift happens in measured stages
- Port patching and finish cleanup, with tile and flooring protected throughout
- Post-repair elevation survey documenting the corrected profile against the starting readings
Why We Use Polyurethane on Clay Soil
Cement slurry mudjacking works, and it remains a legitimate method on stable ground. The problem on Houston clay is weight. A slurry adds significant mass directly onto soil that has already proven it cannot carry the load, which is why slurry-lifted slabs in this region often need a second visit within a few years. Polyurethane weighs roughly four pounds per cubic foot after expansion, so it fills the space without meaningfully increasing the burden on the ground below.
The practical differences matter too. Injection ports are small enough to disappear under a patch, cure time is measured in minutes, and the foam is unaffected by moisture once set, so it neither washes out nor breaks down when the soil goes through another wet cycle. On a home with finished flooring, the reduced disruption is often the deciding factor.
Void Fill Versus Piering: Which One You Need
These two repairs solve genuinely different problems and get confused constantly. Piering addresses a foundation that has moved downward, transferring the structure's load through steel piers to soil deep enough to be unaffected by seasonal moisture. Void fill addresses concrete that has not moved yet but has lost its support underneath. A slab can need one, the other, or both in different areas of the same house.
Our elevation survey settles the question with numbers rather than opinion. Where readings show meaningful differential drop at the perimeter, the honest recommendation is foundation piering. Where readings are close to level but probing finds unsupported concrete, void fill is the correct and much less expensive answer. Where an active water problem caused the erosion, we quote drainage correction alongside it, and homes with slab cracking already showing also need crack repair included in the plan.
Frequently Asked Questions
What does slab void fill cost in the Houston area?
Void fill and slab lifting on a Houston-area home generally runs $2,200 to $6,800 depending on the square footage over the void, how much lift is required, and how many injection points the slab needs. Detached concrete such as a driveway, walkway, or patio usually falls at the lower end. Interior structural slab work with documented elevation loss sits higher, and projects that also need piering are quoted separately because they solve a different problem.
Is mudjacking the same as polyurethane void fill?
They share a goal and differ in material. Traditional mudjacking pumps a cement slurry through larger holes to raise a slab. Polyurethane injection uses a two-part expanding foam through much smaller ports. On Houston clay we use polyurethane for nearly all residential work: it weighs a fraction of a slurry so it does not re-load the same soft soil that failed, it cures in minutes rather than hours, and the smaller ports are far easier to patch invisibly.
Will void fill stop my foundation from settling further?
Not on its own, and any contractor who promises that is selling the wrong repair. Void fill supports a slab across soil that has pulled away beneath it. If the deeper soil column is still losing support, the structure needs piers to reach stable strata. Our elevation survey determines which case you have before we quote, and some homes need both: piers on the settled perimeter and foam fill across the interior voids.
How long does the work take and can I stay in the house?
Most residential void fill jobs are completed in a single day, and you can stay home throughout. The foam reaches load-bearing strength within about fifteen minutes of injection, so floors are usable the same afternoon. Driveways and garage slabs accept vehicle traffic the following morning. There is no heavy excavation and no spoil pile on the lawn.
How do I know there is a void under my slab?
The common signs are a hollow sound when you tap the floor, a section of slab that flexes slightly underfoot, tile or grout cracking in a band rather than at a single point, and gaps opening where a patio or driveway meets the house. None of these confirm a void by themselves. We verify with an elevation survey and probe testing at the suspected area before recommending any injection.
Warranty on Void Fill Work
Injected polyurethane carries a five-year workmanship warranty covering the filled area against re-opening under normal conditions. That is a deliberately narrower guarantee than the lifetime transferable warranty on our piering work, and the reason is honest: piers reach strata that does not move seasonally, while void fill sits in the zone that does. If an uncorrected water source refills the void, the warranty on the injection does not repair the drainage fault that caused it, which is why we quote both together when the assessment calls for it. Our Houston cost guide breaks down how these line items are usually priced.
Serving Jersey Village and the Houston Metro
We provide void fill and slab lifting throughout Jersey Village, Houston, Cypress, Spring, Katy, Copperfield, Willowbrook, Champions, and Tomball. See our service areas for coverage by suburb, or read the FAQ page for background on foundation movement in Houston clay.
Get a Free Slab Inspection
Call Jersey Village Foundation Repair Pros at (281) 555-0184 for a free elevation survey and void assessment on your slab, driveway, or garage floor.