On-Grade Slab Leveling

The foundation of your home is the most important part of the home since it is the base that the entire structure sits on. If your home is built with an on-grade slab, then it is important to know the signs that you may have a sinking or settling on-grade slab. Slabs can shift and settle due to the soil beneath them.

On-grade slab leveling and lifting in St. Louis and Kansas City, MOWhen the expansive soil in the Kansas City and St. Louis area gets wet it will heave and when the soil is dry, the soil will shrink and create voids. This constant shifting of the soil will also cause your slab to shift and sink into the voids beneath the slab.

Signs Your Slabs May Have Settled

  • Leaning chimney
  • Doors and windows that stick
  • Floor cracks
  • Wall cracks
  • Ceiling cracks
  • Porch and stoop settlement
  • Stair-step cracks in brick or concrete

If you notice any of these signs that your slab has settled, it is important to contact Polyjacking.com. We can inspect your on-grade slab and offer you our slab lifting repair method to get your slab back to its original level.

On-Grade Slab Leveling Solutions

Polyjacking is the method we use for on-grade slab leveling in the St. Louis and Kansas City areas. This is a method where high-density polyurethane foam is injected into the area of the affected slab and fills the voids beneath the slab to lift and stabilize the slab. With the right poly equipment, this method is relatively simple.


  • On-grade slab leveling and lifting in St. Louis and Kansas City, MOA small 5/8" hole is drilled into the affected area of the slab.
  • High-density polyurethane foam is injected into the hole.
  • The foam expands to fill the entire void.
  • As the foam expands, the slab is lifted and stabilized.
  • The holes are filled and the site is cleaned up.
  • Due to the fast curing time of 15 minutes, the slab is ready after the repair is completed.

Polyjacking is much more cost-effective than replacing your slab. Polyurethane foam is also water-resistant, unlike mudjacking, so this method is long-lasting.

Don't let your sinking slab be ignored. The longer you wait to get the repair done, the more structural damage will occur throughout your home. Polyjacking.com will get your repair done quickly and professionally so you won't have to be concerned about structural damage. Contact us today for a free estimate.

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