What Is Happening Below the Slab
Polyurethane foam lifting uses expanding material injected through small holes to fill voids and raise concrete. It adds relatively little weight and is often chosen where added load on soil is a concern.
Mudjacking uses a slurry mixture to lift the slab. It can be useful in some settings, but the material is heavier and may require larger injection points. The right method depends on slab condition, soil support, access, and the amount of lift needed.
What to Check First
- Whether the slab is intact or fractured into several loose pieces.
- Whether water drains toward the low area or away from it.
- Whether the height difference creates a trip edge or door clearance problem.
- Whether nearby slabs or foundation-adjacent concrete are moving too.