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Yes, expanding foam (also known as polyurethane foam) can lift concrete. This approach, called polyjacking, involves injecting the foam rather than concrete slurry to fill voids and raise the concrete slab back into place. It’s often faster and requires smaller drill holes than traditional mudjacking, though it may come at a higher cost. Some contractors also prefer polyjacking over mudjacking for more damaged and delicate slabs.

A sinking foundation can be lifted, most often by installing piers to re-level and support the weight of the house. Depending on the cause and extent of the sinking, other methods to lift a foundation include underpinning and mudjacking. Consult a foundation repair pro to determine the best way to lift your sinking foundation. 

Polyjacking and mudjacking can both be good solutions to sinking concrete, depending on your situation. Polyjacking, which uses expanding polyurethane foam to lift concrete, is a better option than mudjacking because the foam weighs less and won’t contribute to additional sinking. Polyjacking can be a suitable solution for any sinking concrete slab, while mudjacking is normally only a good option for non-structural concrete, like sidewalks, patios, pool decks, and concrete driveways. However, polyjacking costs much more—as much as $25 per square foot, compared to the maximum of $6 per square foot you’d pay for mudjacking.

Mudjacking normally takes between one to three days to dry completely. The larger the project area, the more time it will take to dry. You should not walk on the concrete or place furniture or vehicles on the lifted concrete until it’s completely cured, which a pro can help determine. If you’re polyjacking instead, the polyurethane foam can take just a few minutes to dry, but wait an hour to be sure.