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Polyurethane Foam Leveling

Polyurethane foam leveling, also called polyjacking or foam jacking, lifts and levels sunken concrete slabs by having expanding foam injected underneath.

The process starts with small holes drilled into the sunken slab, followed by injection of a lightweight, waterproof foam. As the foam expands, it fills the underlying voids, stabilizes the loose soil, and gently lifts the concrete back to level.

Common Problems Solved by Polyurethane Foam Leveling

Sandy loam and other loose, granular soils lack the load-bearing capacity of denser soils, so the ground beneath a slab can shift under the weight of the concrete above it. Heavy rains and poor drainage compound the problem by washing fine particles away and creating what engineers call soil voids. Once those voids form, the heavy concrete has nothing solid to rest on, so it cracks and sinks.

  • Sunken driveways and walkways: Settled concrete caused by soil erosion, washouts, or poor initial compaction.
  • Tripping hazards: Uneven sidewalk joints and walkway steps create safety risks and liability issues.
  • Uneven patios and porches: Sinking slabs disrupt proper yard drainage and cause water to pool near foundations.
  • Unlevel garage floors: Sunken interior concrete pads with heavy vehicle traffic.

Benefits of Polyurethane Foam Leveling

We provide straightforward assessments and recommend polyurethane foam leveling because it offers a highly effective repair for uneven slabs. This approach addresses the root cause to provide a lasting solution. Here’s why homeowners choose this method:

  • Faster curing time: The polyurethane foam hardens in seconds, and the surface is ready for normal use within an hour.
  • Lightweight: Weighing under five pounds per cubic foot compared to heavy mudjacking slurry (about 100 pounds), it adds minimal stress to weak sub-soils.
  • Waterproof and hydrophobic: The cured material repels water, meaning it won’t wash out, erode, or break down when exposed to heavy rain or moisture.
  • Non-invasive process: Technicians drill very small, discreet holes (around 5/8 of an inch or smaller) that are easy to patch and hide.
  • Long-lasting: The expanding foam fills empty voids in the underlying soil, stabilizing the base to prevent future sinking.

Frequently Asked Questions

Polyurethane foam leveling is used to raise, stabilize, and lift sunken concrete slabs back to their original position.

Yes, polyurethane foam leveling is generally considered a better choice than mudjacking because it’s lighter, longer-lasting, and requires much smaller drill holes.

In a sense. Polyurethane foam leveling is waterproof and stops water from eroding the sub-base, but it’s not a general waterproofing membrane for stopping active water leaks and won’t stop major groundwater intrusion through a foundation.

Polyurethane foam leveling is beneficial and commonly used to repair sunken slabs under driveways, sidewalks and walkways, patios and pool decks, and garage floors.

Polyurethane foam leveling typically lasts 20 to 50 years, as closed-cell polyurethane foam is inert, waterproof, and doesn’t naturally degrade. It’s a better choice than traditional mudjacking, which typically lasts around five years before eroding or sinking begins again.