Concrete Leveling & Poly Foam: A Faster Fix for Sunken Slabs
If your driveway, front walkway, or patio in Austin has started to sink, tilt, or crack at the seams, you may not need a full foundation repair. In many cases, it’s a concrete leveling problem that can be addressed with slab lifting using poly foam injection, a faster, less invasive solution.
Austin’s expansive clay soil swells when it’s wet and shrinks when it dries out. That constant movement can undermine the ground beneath driveways, garage floors, sidewalks, and pool decks, creating voids that cause the concrete above to sink unevenly. Poly foam slab lifting fills these voids and raises the affected concrete back toward its original position.
This type of concrete settlement is separate from structural foundation settlement and typically doesn’t require tearing out and replacing the existing slab.
Poly Foam vs. Mudjacking for Slab Lifting: What’s the Difference?
Both methods are used for slab lifting, raising sunken concrete back toward its original level, but they work in different ways.
- Mudjacking pumps a heavy mixture of soil, sand, and cement beneath the slab through relatively large drilled holes. It typically costs less upfront but can take about 24 hours to cure. The added weight may also contribute to future settlement when the underlying soil is already unstable.
- Poly foam slab lifting, also known as polyjacking, injects lightweight, expanding polyurethane foam through holes about the size of a dime. The foam expands beneath the concrete to fill voids and lift the slab, curing in roughly 15 minutes to a few hours while adding very little additional weight to the soil.
For Austin’s shifting clay soils, poly foam slab lifting offers a lighter footprint and faster cure time, making it a practical option for addressing settled concrete without adding significant weight to unstable soil.
How the Poly Foam Process Works
G.L. Hunt’s concrete lifting process follows three simple steps:
- Drill – Small holes are drilled into the affected concrete.
- Pump – Polyurethane foam is injected beneath the slab, expanding to fill voids and lift the concrete back to level.
- Patch – The injection holes are sealed, leaving a clean, finished surface.
Most jobs are completed in a matter of hours, not days, with minimal mess and no heavy equipment tearing up your yard.
Where Poly Foam Works Best?
Poly foam concrete leveling is a great fit for:
- Sunken driveways and garage floors
- Cracked or uneven sidewalks and walkways
- Tilting patios and pool decks
- Trip hazards at concrete seams
- Minor soil stabilization around slabs
Concrete Leveling vs. Foundation Repair: Which Do You Need?
Not every sinking concrete surface means your home’s foundation is in trouble. If the settlement is limited to a driveway, patio, sidewalk, or walkway, slab lifting is often the appropriate solution. It raises the sunken concrete back toward its original position without requiring major structural repairs and can typically be completed much faster than foundation work.
However, if you notice signs of movement inside your home, such as cracked walls, sticking doors, or sloping floors, the issue may extend beyond exterior concrete settlement. In that case, schedule a separate foundation evaluation to determine whether structural foundation repair is needed.
Why Austin Homeowners Choose G.L. Hunt
G.L. Hunt has been solving Texas’s expansive-soil problems for years, with local teams who know exactly how Austin’s clay reacts through the seasons. Our poly foam service is fast, clean, and built to last, without the disruption of a full concrete replacement.
Get a free concrete leveling estimate today and see how quickly your sunken slab can be back to level.
FAQ
How much does poly foam concrete leveling cost compared to mudjacking?
Poly foam typically costs more upfront than mudjacking because of the material itself, but its lighter weight and longer-lasting results often make it the better value over time, especially in Austin’s shifting clay soil.
How long does poly foam concrete leveling take?
Most residential jobs are completed in just a few hours, and the foam can cure enough for use in as little as 15 minutes to an hour, much faster than mudjacking’s 24-hour cure time.
Will slab lifting work on my driveway, patio, or sidewalk?
Yes. Slab lifting with poly foam injection is commonly used to level driveways, garage floors, walkways, patios, and pool decks, anywhere a concrete slab has sunk or become uneven due to soil movement.
Is poly foam concrete leveling different from foundation repair?
Yes. Concrete leveling addresses exterior slabs like driveways and patios, while foundation repair addresses structural issues with the home itself. If you’re only seeing sunken concrete outside, leveling is typically all you need.
Is poly foam safe and environmentally friendly?
Yes. The polyurethane foam used in concrete lifting is made from recycled materials and is non-toxic, making it a safe option for residential properties.
