Mudjacking is performed by drilling 1 5/8" holes through the top surface and pumping, under hydraulic pressure, a sand slurry underneath the slab. As the mixture flows beneath the surface, voids are filled and the slab is raised to achieve the desired height. The sand slurry mixture is pumped under the slab with our specialized equipment. Once any void is filled, the slurry becomes pressurized, hydraulically raising the slab to the desired height.