Does My Sunken Slab Need to be Repaired?

Some people may think that a sinking slab is nothing more than something that is unsightly. It’s actually a sign of a bigger problem, in addition to being a tripping hazard and cause for water in your home.

Regardless of where the slab is located, it should be repaired. Homes can have slabs as foundations, sidewalks, patios, decks, driveways and more. Not every crack is a warning sign, but they should be inspected by a trustworthy and knowledgable specialist. When a concrete slab not only has cracks, but also sinks, then you are likely to have a structural problem.

Does my sunken slab need to be repaired?

Problems Caused by Sunken Slabs

A sunken slab can be a dangerous tripping hazard. Trips and falls are the number one source of claims on homeowner’s insurance policies. In addition, an uneven slab can damage vehicles, furniture, and other pieces of property. 

If a slab sinks, the water is not going to drain properly from the slab. It can run towards a home’s foundation, causing the basement or crawl space to flood. Water can wash out foundations or erode the soil underneath the concrete surface.

For the safety of the people on your property and the stability of your home or slab, it is important to raise a sunken slab and prevent it from settling again. Polyjacking is an effective concrete repair method for leveling a sunken slab.

Causes of a Sunken Slab

There are a couple of reasons that a slab can sink. It is more common for a portion of the slab to sink than the whole concrete area. 

Compressed Soil

If the soil beneath the slab wasn’t properly compressed during construction, the weight of the slab can push the soil down, allowing the concrete surface to sink. 


Heavy rains, broken pipes, and other causes of water flow can wash the soil out from under the concrete slab. The concrete will then sink into the hole, becoming unlevel or breaking.

Best Solution for a Sunken Slab

You may still find contractors that recommend you break up the concrete and pour a new slab. This is expensive, time-consuming, and doesn’t address the problem that caused the slab to sink in the first place.

After wasting the money of demolition and then repouring the concrete then waiting days for the slab to cure, you’ve done nothing to prevent the soil from compressing or washing away. Some shifty contractors may add more concrete to the void, but all that does is add more weight to the weak soil, making it even more likely that you will have another sunken slab eventually.

There is a better solution, one that Airlift Concrete Experts has been using for over a decade: polyjacking or polylifting. Polyjacking eliminates the problems associated with other slab repair methods. Polylifting uses a polyurethane foam that expands, lifting the slab and sealing the underside portion of the concrete.


Using polyjacking methods is exponentially more cost-effective than demolishing the concrete. Heavy equipment will be needed to break up the concrete and then to pick up the debris. The equipment, personnel, and time for the demolition cost money. Then you have to pay someone to pour the new concrete. The dollar signs will be lighting up a contractor’s eyes if you go this route.


The entire polylifting process takes less than an hour to complete in the majority of situations. The process involves drilling fewer and smaller holes than other methods, so clean up takes less time. The foam cures in about 15 minutes, so it’s a race to which is done first: the cleanup or the curing. As soon as they’re both done, you can use your concrete slab again.


As stated earlier, removing and replacing the concrete doesn’t address the underlying problem that caused the slab to sink in the first place. The polyurethane foam compresses the soil as it expands. It not only lifts the slab to within 1/10th of an inch, but it makes sure the underlying soil is stable. In addition, the foam is water-resistant so it won’t wash away like soil or the slurry used in mudjacking. The foam also fills in the gaps and cracks on the underside of the slab, preventing water from flowing through the slab, undermining the stability of the concrete surface.

Learn More About Polyjacking

Although polyjacking has been around for a long time, many homeowners are unfamiliar with it. If you have a sunken slab, contact a contractor that specializes in polylifting before you commit to demolishing the concrete. Get all the facts and make an informed decision about keeping your family and property safe. A strong, stable slab isn’t something that you should make a rash decision about.

Contact the polyjacking experts at Airlift Concrete Experts today to learn more about all the services we offer to help keep your home strong, stable, and safe.



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