“Polyfoam” or “polyjacking,” as it is often called, is a contemporary variant of “mudjacking” that levels concrete slabs in a less intrusive manner than traditional mudjacking. To raise and level the sunken concrete, high-density polyurethane foam is injected into 5/8″ holes and allowed to expand to fill the space. Polyfoam is a more durable and long-lasting alternative to typical mudjacking.
In addition to curing in 30 minutes, concrete leveling foam is mold and water resistant, does not erode, and sustains 6,000 to 14,000 lbs. of support per square foot of concrete surface. It is, on the other hand, more costly than mudjacking.
Mudjacking costs between $3 and $6 per square foot, but polyurethane foam jacking, also known as PolyLevel, costs between $5 and $25 per square foot. Porches, for example, are more expensive per square foot than plain slabs such as sidewalks because they are larger and thicker.
The warning indications that your concrete needs to be leveled are not always obvious. It is the most obvious evidence of a badly compacted subsurface, erosion caused by water leaks, animals digging under the surface, or other structural concerns that need leveling.