Mud Jacking or Pressure Grouting is a foundation repair technique that can be used to fill voids under the slab with minor interior lifting. The process can also be used to raise driveways, sidewalks and patios.
Materials consist of a mixture of topsoil, cement, lime and water. This is mixed to the consistency of mortar. The mixture is then placed in the mud pump, which is injected through a 2 1/4" hole drilled through the slab. For interior pumping, the floor covering must be removed and the walls masked off with plastic.