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How to fix uneven concrete

Sunken, uneven concrete walkways, pool decks and back patios are not only unsightly, but they can pose a tripping hazard as well. As a homeowner, if you have any hazardous areas on your property, the last thing you want is for family or guests to fall and injure themselves. 

While it may seem like the most logical repair tactic is to tear out the section and lay a new patio or walkway, there is actually another, less invasive way to solve the problem. Slabjacking, mudjacking and concrete lifting are the three most common names for a solution to uneven concrete. This method forgoes the need to demolish the slab, and allows use of the area within 24 hours of the repair.

fix uneven concrete

Source: Slablifters

What causes uneven concrete?

There are various reasons why concrete tends to sink over time. The most common however, can be traced back to the way it was put down in the first place. When walkways and patios are first laid, it’s important to tamp the fill dirt. If this isn’t done, over time the air in the spaces between the particles comprising the fill dirt will be squeezed out by the concrete, thereby causing it to sink.

What is slabjacking?

No matter what you want to call it, slab jacking (or mud jacking) effectively lifts the sunken area without removing it.

A few holes are drilled into the sunken concrete, typically between 3 to 8 feet apart. Once the holes have been drilled, a hose is then inserted and a special compound generally consisting of sand, ash, cement and other substances is pumped into each hole, beneath the concrete. The sunken section is then floated into place.

The final step in the process is to fill in the holes with a concrete mix. The filled in holes are noticeable at the end of the procedure.

Some mudjack companies choose to drill cores rather than holes. This process allows the cores to be “glued” back into the same hole, thereby making the insertion spot less noticeable.

uneven concrete

Source: Liftec Inc.

Why choose this concrete repair method?

Cost is definitely the biggest benefit to choosing slabjacking over having the concrete replaced. In fact, the cost is typically 1/3 the cost of replacing. However, this is not the only advantage.

Some additional advantages of slabjacking

  • The area can be walked or driven on within 24 hours of the procedure
  • No inconsistent coloration between old and new slabs, because the sunken slab is not replaced
  • No disruption to surrounding grass or landscaping
  • Can be performed under most weather conditions
  • The mixture being injected adds stability to the section
  • Quick and clean
  • It’s affordable

If you presently have a problem with uneven concrete walkways, patios, pool decks or other areas on your property, you may want to consider slabjacking to repair the problem. To learn more about this procedure, search the listings here on for mudjacking or slabjacking contractors in your local area.

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