Garage & Basement Slab Repair

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     Garage and basement slabs experience more stress than most interior concrete surfaces. They support heavy loads, absorb vehicle traffic, feel the impact of seasonal frost cycles, and rely heavily on the condition of the soil underneath. When that soil shifts, weakens, or erodes, the concrete above begins to settle or crack. In basements, sinking floors can create uneven surfaces, trip hazards, or gaps along walls. In garages, settlement often leads to cracked slabs, sloping floors, or edges pulling away from the driveway or foundation. Our Garage & Basement Slab Repair service restores stability and brings interior concrete back to a safe, level condition using engineered polyurethane lifting and stabilization methods.

     Slab settlement inside a home or garage is almost always a sign of compromised soil. Poor original compaction, water intrusion, plumbing leaks, rodent tunnels, and long-term soil consolidation all contribute to voids forming beneath the slab. Once the concrete loses full support, it begins to sink or tilt. Many homeowners assume interior slabs require full replacement—an expensive, invasive project that often disrupts the entire space. In most cases, however, the concrete can be lifted and re-supported without demolition.

     Our repair process begins with identifying the true cause of the settlement. If voids or weak soil are present, we use small injection points to introduce expanding polyurethane beneath the slab. The foam travels into gaps and uncompressed soil, filling voids and restoring the necessary support base. As it expands, it lifts the slab back to its intended elevation with precise control. Because the foam cures rapidly, garage and basement slabs can often be used the same day, minimizing downtime and disturbance.

     Unlike mudjacking, which relies on a heavy slurry that can add additional stress to already failing soils, polyurethane foam is lightweight, waterproof, and engineered to maintain long-term stability. It will not wash out or degrade in areas exposed to moisture—an important factor for interior environments affected by foundation drainage, sump pump activity, or seasonal groundwater pressure. This makes polyurethane an ideal choice for restoring slabs in basements and attached garages, where long-term durability is essential.

Garage and basement slab repair is often needed when homeowners notice:
• Sinking or sloping concrete floors
• Gaps forming along walls or foundation edges
• Cracks spreading across the slab
• Voids caused by water intrusion or poor compaction
• Settlement near the garage apron or entryway
• Flooring materials separating or becoming uneven

     For homeowners with finished basements, early treatment is especially important. Even minor settlement can damage flooring, drywall, trim, and interior framing. Addressing the problem promptly prevents additional structural movement and protects the home’s overall value. For garages, lifting the slab restores proper drainage, and reduces stress on attached foundation structures.

     In more complex situations where soil weakness extends deeper into the subgrade, our repair approach can be paired with soil stabilization or deep injection methods. These services strengthen the underlying soils to resist future settlement, especially in locations prone to moisture, erosion, or collapsing soil layers. With tools like DCP testing, we can verify soil conditions before and after treatment to ensure the slab receives the proper level of support.

     Every garage and basement repair begins with an honest evaluation. If the slab is structurally compromised beyond repair or if replacement is truly necessary, we will always explain the reasoning and offer the best long-term solution. Our goal is to restore stability and safety with the most effective and least invasive method.

     Wisco Concrete Solutions performs interior slab repair throughout Wisconsin and travels for specialized residential and commercial projects in other states as needed. Whether your garage floor has dropped several inches, your basement slab is sinking, tilting, or voids have formed from water intrusion, we provide reliable, long-lasting repairs that restore confidence in your home’s foundation.

     Interior slabs settle when the soil beneath them weakens due to poor compaction, moisture intrusion, plumbing leaks, rodent tunnels, or long-term soil consolidation. When the soil can no longer support the slab, it begins to drop, tilt, or crack.

     We inject expanding, closed-cell polyurethane beneath the slab through small access points. The foam fills voids, strengthens weak soil, and gently lifts the slab to the correct height, all without demolition or major disruption.

     Yes. When a slab settles toward the home or creates a low spot, drainage is affected. Lifting the slab restores the proper slope so water flows away from the foundation instead of collecting inside the garage.

     Voids often form due to groundwater movement, sump pump discharge, plumbing leaks, poor backfill compaction, or soil washout near foundation walls. Once a void develops, the slab loses support and begins to sink or crack.

     Yes. Once cured, the foam is inert, non-toxic, and completely waterproof. Because it is a closed-cell material, it does not absorb moisture or deteriorate over time, making it ideal for basement and garage environments.

     Lifting restores proper support beneath the slab, which prevents cracks from spreading further. Some cracks may even partially close after lifting, Thanks to the foam creeping into the voids, while others will remain cosmetic but stable. However we can provide a crack filler service if you'd like.

     Most interior slab lifting projects take a single work day to perform. The waterproof foam cures within minutes, so you can walk on or drive over the slab the same day.

     Yes. When the slab settles away from perimeter walls or foundation edges, gaps often appear. Lifting the slab can close or reduce these gaps and restore proper contact, improving both appearance and structural support.

     Yes. This is a very common issue. We can lift the garage slab back into alignment and, if needed, also lift or stabilize the adjoining driveway slab for a smooth, even transition.

      Yes. While Wisconsin is our home base, we also complete specialty repairs in other states where advanced lifting and soil stabilization solutions are needed.