Why foam beat mudjacking and we stopped offering it
Mudjacking pumps a cement slurry under the slab to float it back up. It works, but the slurry weighs well over a hundred pounds per cubic foot — you are adding significant load to the exact soil that already proved it could not carry the slab. It needs days to cure, the injection holes are large enough to see from the street, and over years the slurry can wash out and let the slab drop again.
Polyurethane weighs roughly two pounds per cubic foot. It expands to fill every void in the soil, it is waterproof so it will not erode, the ports are about the diameter of a dime, and it reaches most of its final strength within fifteen minutes. There is no scenario on a residential driveway where we would choose slurry over foam.



