Concrete Slab Leveling in Knoxville, TN
Polyurethane foam injection that lifts sunken driveways, walkways, and patio slabs back to level — done in hours, not the days a full slab replacement takes.
What's Included
Concrete slabs sink for the same reason foundations settle — the soil underneath erodes, compacts, or shifts with moisture, leaving a void the slab eventually drops into. Rather than tearing out and repouring a sunken driveway or walkway section, polyurethane foam is injected through small, dime-sized holes drilled into the slab. The foam expands, fills the void, and lifts the concrete back to grade.
It's a same-day fix in most cases — the foam cures enough to drive or walk on within a couple of hours, versus days of curing time and a fresh concrete color mismatch with a full replacement pour. If the sunken slab is directly attached to your home's foundation (like an attached garage floor or entry stoop) rather than a standalone driveway or patio, it's worth mentioning during your inspection so we can check whether the foundation itself needs attention too — see our core foundation repair page for that side of things.
- Polyurethane foam slab leveling
- Sunken driveway & walkway repair
- Patio & pool deck leveling
- Cures in hours — no multi-day wait
Frequently Asked Questions
How is foam leveling different from mudjacking?
Traditional mudjacking pumps a heavy cement slurry under the slab, which is messier, slower to cure, and adds significant weight that can cause further settling. Polyurethane foam is lightweight, cures in minutes, and won't add load that contributes to future sinking.
How long until I can use the slab again?
Typically within one to two hours after injection — far faster than the days of cure time a full concrete replacement pour requires.
Will the slab just sink again later?
The same soil conditions that caused the original settling can recur over many years, but foam leveling fills the existing void and stabilizes the base, giving a durable result for a properly assessed slab.
Can you level an attached garage floor slab?
In many cases yes, though a garage slab tied directly into the home's foundation sometimes points to a foundation issue worth checking at the same time — we'll assess that during your free inspection rather than assume.
Worried About a Crack or Sloping Floor?
Get a free, no-obligation foundation inspection from Knoxville Foundation Repair Pros today.