A-1 Concrete Leveling does what is sometimes referred to as "mud jacking." The process involves injecting concrete slurry underneath a sagging concrete slab, which causes the existing slab to rise. Jay Kiger owns the business and he is top notch, standing behind his company's work all the way. On the way of the service, Mark and Charles came over and examined my own situation, which was a bit unusual. They were dubious of what could be accomplished, but they jumped on the task with vigor. A couple of hours later, my concrete slab had been raised, leveled, and vastly improved. The Stair-rails that were attached to the slab were also repaired due to the slab being raised. Success! If you have a situation where your concrete slab has sank down or become tilted, these folks can help you.