STEP 1: A hole (or series of holes) is drilled through the surface of the affected area.
A limestone slurry (grout like) material is pumped into each hole through a pressure nozzle. This material fills the void below the concrete slab, creating hydraulic pressure, which forces the slab upward.
STEP 3: The slab surface is cleaned and the holes are filled, providing immediate use in most cases.
Raising and leveling concrete is a hydraulic pressure process system used nationwide, as an alternative to removing and replacing existing sunken concrete.