Many sunken concrete slabs can be lifted rather than replaced. Mudjacking pumps a cement-based slurry under the slab, while polyurethane foam leveling injects expanding foam through smaller holes. Replacement makes more sense when slabs are badly cracked, crumbling, or sinking because of a larger drainage or soil problem.
Uneven concrete creates trip hazards and can direct water toward foundations, so fixing it matters for safety and drainage.
How the Methods Compare
- Mudjacking: uses heavier slurry and larger holes; often lower material cost.
- Foam leveling: uses lightweight foam and smaller holes; cures quickly so surfaces can often be used soon after.
- Replacement: removes and repours the slab; best for badly damaged concrete.
- Appearance: lifting leaves patched holes; replacement creates a uniform new surface but may not match old concrete color.
Find the Cause First
Slabs usually sink because soil underneath washed out, compacted, or was poorly prepared. Downspouts discharging near sidewalks and poor grading are common culprits. Ask contractors what caused the settling and how they recommend preventing it from happening again.
Lifting a slab without fixing drainage may only buy a few years. Extending downspouts and regrading can make repairs last longer.
Questions for Contractors
Ask which method they recommend and why, how they prevent over-lifting, what warranty they offer, and how they seal joints afterward. For foam, ask about the product’s density and how voids are filled. Request before-and-after photos of similar projects.
Concrete lifting is not a fix for structural foundation problems. Cracks in foundation walls or sloping floors inside the home need evaluation by a structural engineer or foundation specialist.
Safety and Liability Considerations
Uneven sidewalks and steps create trip hazards for family members, visitors, and customers. Businesses and landlords may face liability if someone is injured on uneven concrete. Many cities require property owners to maintain sidewalks adjacent to their property, so check local rules and repair schedules if you receive a notice.
Getting Quotes
Measure the affected areas and photograph them before calling contractors, so quotes are easier to compare. Ask whether pricing is per slab, per square foot, or per amount of material used.
Concrete leveling contractors are listed in the construction and remodeling pages on Info Lion, where property owners can compare local options.
Lift When You Can, Replace When You Must
Mudjacking and foam leveling can restore sunken slabs at lower cost than replacement, while badly damaged concrete may need a new pour. Find and fix the cause of settling, ask about warranties and joint sealing, and leave foundation issues to specialists. Info Lion can help you compare contractors.
