Concrete Leveling: frequently asked questions
These answers are general. For your situation, check the official sources listed below or ask a professional.
Foam or mudjacking?
Polyurethane foam is lighter, cures fast and uses smaller holes; mudjacking uses a cement slurry and is often cheaper on large slabs. Both are widely used.
How long before I can use the slab?
Often within hours for foam; ask the contractor for mudjacking.
Will it sink again?
If the cause, often water washing out the soil, is fixed, the lift usually lasts. Ask about drainage and warranties.