We're a residential slabjacking contractor and we often find that when one edge of a sidewalk slab settles, the opposite edge is raised. Raising the settled edge does not always make the opposite edge go down. Do you know of an economical way to lower a slab?
When a slab has an elevated edge, most contractors find it more practical to raise the slab next to it rather than trying to lower the raised slab. Raising the adjacent slab eliminates the trip hazard, but it can look awkward. If this is unacceptable, most contractors opt to remove and replace the raised slab. One contractor we spoke to, however, does lower slabs when needed. He uses a steel jack with a leverage bar to raise the slab off the ground. He then scrapes out the excess subbase material and lowers the slab.