Concrete Slab Problems

Concrete Slab Problems and Troubleshooting Tips

Concrete Slab Problems, concrete repair Kansas City, concrete repair St. LouisConcrete slab problems are a common occurrence in basement floors, garage floors, and other concrete surfaces. They go ignored for years until the surface gets worse. Without necessary repairs, cracks may spread and get larger allowing water to seep through the surface. If you know what to look for, most concrete slab problems can be easily identified. Some common slab problems include the following:

Shrinkage Cracking

  • Cause: Plastic shrinkage cracks are very thin cracks that do not affect the condition of the slab. They are usually a cosmetic issue caused by the drying and shrinking of the concrete surface. They develop in the first few hours after concrete the concrete is poured and before the job is complete. This usually occurs when the concrete is still plastic and shrinks due to rapid moisture loss.
  • Solution: There is no easy fix, but plastic shrinkage cracks can be prevented. Make sure the surface does not dry too quickly. Also, use lower water content mixes to prevent too much shrinking.


  • grinding concrete for repairs in Kansas City and St. LouisCause: Dusting is chalking at the surface of the concrete slab and can be rubbed off with your finger. It can be easily damaged by traffic use or with a stiff bristle broom. Dusting can be caused by finishing, floating, or troweling of condensation moisture from the humid air on the cold concrete surface.
  • Solution: Grind or seal the concrete floor surface to remove the top few millimeters of the surface. Grinding and sealing the surface will also remove rough spots and any surface indentations from the concrete slab.


  • Cause: When looking for scaling, look for loss of mortar. Scaling is caused by deicing salts, freezing and thawing cycles, hard troweling, improper curing, or low air content in the concrete mix.
  • Solution: It can be prevented by providing a good air void system and making sure salts do not get on the surface until the concrete has dried for at least 30 days. Scaling can also be fixed with concrete grinding. This method removes the top layer of the surface and levels uneven concrete.

Serious Cracking

  • small concrete crack repair in the Missouri areaCause: Serious cracking in a concrete slab is an indication of excess water and soil settlement beneath the concrete slab. These cracks are far more serious than surface shrinkage cracks and could lead to the foundation slipping or becoming uneven.
  • Solution: These can be fixed temporarily with polyurethane injected directly into the crack. For permanent repair, it is better to inject a polyurethane foam beneath the entire surface to not only fill in cracks but stabilize the soil and fill in voids.

Sinking or Settling

  • Cause: By the time your concrete slab has started sinking, settling, or becoming uneven, it is a certain sign that the soil beneath the concrete has settled or developed voids in it.
  • Solution: The best long-term solution is polyjacking, which lifts and levels the concrete and has other benefits.

Why Choose Polyjacking for Concrete Slab Repairs?

If your concrete slab has severe cracks or is sinking, settling, or shifting, can provide the best long-term solution for concrete repair, polyjacking. We’ve perfected the polyjacking method and actually developed the term. Polyjacking is a process of injecting polyurethane foam beneath a concrete surface to lift, level, and stabilize the concrete slab. In addition to leveling it, the process also seals cracks, fills voids, and reinforces the soil beneath the concrete. It takes only minutes to complete and prevents any further problems for years to come. We’ve won Angie’s List Super Service Award and other awards for our outstanding customer service. Contact us today for a free estimate!

Free online quote

service area

service area map polyjacking