Uneven sidewalk slabs are the result of washed out or poorly compacted soil below the concrete. If the concrete slabs are too thin and brittle, removal and replacement is necessary. In most cases, there's a better solution.
Filling the void under the slab is essential to bringing the slab back into its original position and keeping it there. Mudjacking is a common solution used but this can be messy, creates many large holes in the concrete and it's heavy which puts more weight on the soil below and often makes the problem worse.
Instead, we suggest using PolyLEVEL. PolyLEVEL requires fewer holes in the concrete and the holes that are drilled are significantly smaller. High-density polymers are injected under the slab. After the void is filled, the polyurethane expands which creates a precise lift and stabilization of the slab. The polyurethane is lightweight, has a high-capacity lifting strength, can be driven on in only 15 minutes, and it won't break down or deteriorate underground.