Uneven or sunken concrete slabs can create trip hazards on sidewalks, patios, pool decks, stairs, and other areas throughout a community. Because of this, concrete trip hazards present a liability risk for community associations. If someone trips and gets injured, it could lead to a personal injury lawsuit.

Click images to enlarge.

Concrete trip hazards also violate the Americans with Disabilities Act (ADA). The Americans with Disabilities Act (ADA) of 1990 defines a “trip hazard” as any vertical change of over 1/4 inch or more at any joint or crack.

Anyone can bring an ADA lawsuit. They do not have to be disabled themselves. ADA lawsuits are lengthy, stressful, and expensive. Even cases that settle out of court can be $40,000, on average.

Polyurethane Foam Injection

At Bay Area Underpinning, we use polyurethane foam injection to lift uneven sidewalks and other concrete slabs. Here is a video below that shows a bit of our process.

Polyurethane foam injection – also known as “slabjacking or foam jacking” – is a minimally-invasive procedure that raises uneven slabs without destroying them by grinding or cutting. Once the polyurethane foam is injected firstly as a liquid it will penetrate weak soil and difficult to reach voids as it expands and dries.

Polyurethane foam is

  • Waterproof
  • Flame-retardant
  • Noninvasive
  • Nonpolluting

Raising the uneven concrete with polyurethane foam injection is a simple, minimally-invasive 3-step process that lifts your concrete slab back to a safe position and eliminates the trip hazard:

1. First, small 5/8” holes are drilled in the concrete in the area to be lifted.
2. The polyurethane foam is injected under the concrete through ports placed in the holes. As the foam flows underneath the concrete, it expands, fills the void, and lifts the concrete back into place.
3. Finally, the small holes are patched over.

unlevel concrete polyurethane foam injection

Polyurethane foam injection is more cost-effective than digging up and replacing the slab. To add, shaving down the concrete slab doesn’t address the void and weak soil underneath. Therefore it is a temporary fix and makes the concrete not look as nice anymore. Most repairs are completed in just a few minutes and then the slab is immediately ready for safe use.

For more information see, Slab Repair: How To Fill A Void Under A Concrete Slab.

If you have one or more uneven concrete slabs in your community, contact us today to set up your free, comprehensive concrete trip hazard assessment