The mudjacking process that Pingel Mudjacking uses works to raise and support settled and uneven concrete by injecting grout under the settled area. This is done by drilling 1 5/8" holes through the surface. Grout is pumped through the slab to float slab in proper place. After mudjacking is complete, holes are patched and textured to match the existing concrete as closely as possible. Leveled concrete that is at least 10 years old, can be expected to stay in position until the end of its useful life.