Should I Fix My Sunken Slab?

When a concrete slab begins to sink, it not only looks bad, but it can be a sign of a serious problem. You must have a professional take a look to see what is causing the slab to sink. They’ll not only be able to raise the concrete, but also fix the underlying problem.

Regardless of the location of your slab, it is worth fixing. A concrete slab in your basement, patio, driveway, sidewalk, or garage are all important surfaces and need to be safe and stable. 

Cracking and Sinking is a Bad Sign

Should you repair your sunken concrete slab?An uneven slab can be a tripping hazard, which is the #1 cause of insurance claims around the home. The slab is not going to heal itself, even if you hope that it will just go away or that no one will be injured. So, before someone gets hurt and sues you, have a professional inspect the slab and repair it. 

Lifting a slab correctly and safely is not a DIY project, it takes special equipment and training to do the job right. A slab will crack and sink when the soil beneath it is not supporting it. This can be caused by erosion, soil that wasn’t compacted, oversaturated soil, and other events occurring below the surface.

Causes of a Sunken Slab

As we stated above there are a few reasons why a concrete slab may sink.  The soil is not doing its job of supporting the concrete. The weight of the slab may be compressing the soil, causing the concrete to sink. Another cause may be soil erosion. If the soil beneath the surface is washed away, the slab will sink into the void that is left behind.

Many people believe that they have to break up the slab and start over with a new concrete surface. The professionals at Airlift Concrete Experts advise you to find another option. Breaking up and replacing concrete is expensive, messy, and time-consuming. On top of these reasons, if the underlying soil problem isn’t addressed, you’ll just have another sunken slab in a short amount of time.

Sunken Slab Solutions

Airlift Concrete Experts has a solution for your sunken concrete that costs less than demolition, involves less equipment, takes less time, and is more effective than breaking up and replacing the slab. The solution is called polyjacking and has been used by highway departments across the country for years. It is now being used more and more for residential applications as the cost has come down and the contractors have become more experienced with the method.

Polyjacking involves drilling a few small holes (5/8″) into the concrete surface. Polyurethane foam is injected into the holes, the foam expanding beneath the surface. The foam fills voids, compresses the soil, and lifts the concrete to within a fraction of an inch of the desired height. 

The foam hardens within 15 minutes of injection, allowing you to use the surface quickly, instead of having to wait days for new concrete to cure. The hardened foam is water-resistant, so it won’t wash away. Another benefit of polyjacking over mudjacking is that the foam weighs a fraction of what the mud grout weighs. If the soil is already unstable, it doesn’t make sense to add hundreds of pounds of extra weight to the area.

Contact Airlift Concrete Experts today for a free inspection and quote. 

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