What Is PolyRenewal™?

PolyRenewal™ is a repair method that is used to lift settling concrete. The concrete in question settled because the soil underneath it eroded and shifted, causing the concrete structure to become uneven. So, PolyRenewal™ looks to fix that problem by injecting polyurethane foam underneath the slab. The foam expands and fills the gaps left behind by the soil until there is also enough foam to lift the structure back into place. Once cured, the polyurethane becomes the support the concrete needs to stay even.

Polyurethane foam is usually associated with softer materials since it’s the material used to make sponges. However, the closed-cell polyurethane used for concrete lifting is different from the open-cell polyurethane. Closed-cell polyurethane is dense, firm, and impermeable once it has cured. It has a compression strength of 7,200 psf, and despite its density, it only weighs 4 to 6 pounds per cubic meter. Being a lightweight substance has its advantages when it comes to avoiding further disruption of the soil.

The entire process can be done in a few short hours, depending on the size of the job, and in the end, your concrete looks newly poured. PolyRenewal™ can be used on any concrete slabs or concrete steps on your property. Because the device used to inject the foam is small, PolyRenewal™ can repair concrete just about anywhere. PolyRenewal™ can even lift slabs that have cracked, but it can’t repair structures with multiple broken pieces.