Mud-Jacking is never a good long-term solution for foundation repairs. Mud-Jacking is normally used to lift and support existing concrete slabs. Poor compaction is the reason most patios, garage floors, driveways and basement floors sink. A concrete floor can only be mud-jacked if it is in good condition. Mud-Jacking is a procedure which involved drilling two inch diameter holes through the floor in an impressed area, bringing in a hose which is about the size of a fire hose, with a nozzle that fits in the holes and pumps a thick mud grout under the floor. The grout is typically comprised of water, a sandy loam soil and about 12% cement. The grout is pumped under the concrete slab with several hundred pounds of pressure until all voids are filled and the back pressure lifts the foundation to where it needs to be. Mud-jacking has been successfully used to lift porches, streets and driveways at a cost much lower than replacement. Mud-jacking is a process that cannot be fully controlled by the contractor once the grout leaves the nozzle. The grout always takes the path of least resistance, which means once it leaves the nozzle the grout can come up through bathtubs, shallow areas of concrete flooring, leave outs, etc. Mud-jacking also tends to be a temporary method of repair. In order for the grout to hold the foundation in position the soil beneath it must remain in place. If the soil moves due to loss of moisture then the grout will not be able to hold the load.