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Rockland Foundation Co

Service

Concrete Slab Leveling and Void Filling in Miami

Polyurethane foam or grout injected under a slab that has dropped or gone hollow.

Slab leveling raises a concrete slab back to grade by injecting material into the void underneath it, rather than by tearing the slab out. In Miami the void usually comes from water: a leaking supply line, a broken drain, storm runoff channelled against the house, or tidal groundwater moving fine sand out from under the slab and into the rock below. The two common methods are polyurethane foam injected through small ports, which expands and lifts within minutes, and cementitious grout, which is cheaper per unit but heavier. Driveways, pool decks, patios, garage slabs, and interior floors are all candidates. Typical residential jobs run $1,400 to $6,500 and finish in a day, with the slab back in service the same afternoon on foam.

What is included

  • Void mapping before the quote, so the injection pattern matches the actual hollow area
  • Polyurethane foam injection through 5/8 inch ports, cured and load-bearing in about 15 minutes
  • Cementitious grout (mudjacking) where the lift is large and appearance underneath does not matter
  • Plumbing leak check first, because lifting a slab over an active leak just buys time
  • Pool deck, driveway, walkway, patio, and garage slab work
  • Interior floor lifting with port holes patched to match
  • Trip-hazard correction at slab joints that have stepped
  • Post-lift elevation check against the original survey points

Common questions about slab leveling

How much does slab leveling cost in Miami?

Most residential slab leveling in Miami runs $1,400 to $6,500. A section of driveway or a walkway with a stepped joint is often $1,400 to $2,500. A full pool deck or a large patio runs $3,500 to $6,500. Interior slab lifting costs more per square foot because the ports have to be drilled through finished flooring and patched. Foam runs higher per hole than grout but uses fewer holes and less weight, which matters when the reason the slab dropped is soft ground in the first place.

Is foam injection better than mudjacking?

For most Miami work, yes, and for a specific reason: weight. Cementitious grout is heavy, and pumping several tons of it onto ground that already could not hold the slab is a short-term fix. Polyurethane foam weighs a fraction of that, cures in minutes, does not wash out, and goes in through much smaller holes. Grout still has its place on large voids where cost per cubic foot dominates and the underlying soil is sound. If someone quotes only one method without looking at what is under the slab, ask why.

Can a sunken slab be lifted, or does it need replacing?

It can usually be lifted if the concrete itself is sound. The test is whether the slab is broken into many small pieces or has dropped as one or two large panels. Large panels lift well. A slab that has crumbled, is heavily spalled, or has been patched repeatedly is often cheaper to replace, and a slab that is dropping because of an active leak needs the leak fixed first regardless. A good assessment includes tapping the slab to find the hollow areas and shooting elevations across it.

How long does a slab lift take?

Most residential jobs are a single day. Foam cures enough to drive on within about 15 minutes of injection, so a driveway lifted in the morning is usable that afternoon. Cementitious grout needs longer, typically 24 to 48 hours before vehicle loading. The part that takes time is not the injection, it is the setup, the elevation shots, and getting the lift sequence right so the slab comes up evenly instead of cracking.

Related Reading

More on slab leveling in Miami-Dade

Buying an Older Miami House: The Structural Part

About a third of Miami-Dade housing predates 1970, and in the City of Miami it is nearer 40 percent. What age means for a block house here, and what to check.

NIST's Surfside Findings, and What They Do Not Say

NIST released its technical findings on the 2021 Champlain Towers South collapse in June 2026. It ruled out foundation failure, sinkholes and settling.

The Rock Miami Was Built From, and Built On

The pale, pitted stone in old Miami garden walls is the same formation the city sits on. What it is explains how those walls behave and why footings vary.

Other Services

Related scopes

Structural problems rarely arrive one at a time. A settled footing and a hollow slab usually share a cause, and a spalled tie beam and a cracked wall often share an age. Sorting the whole picture at once saves a second mobilization later.

Foundation Settlement Repair

Underpinning for a footing that has dropped, using helical piers, push piers, or grouting

Concrete Spalling and Structural Restoration

Rebar corrosion repair for slabs, columns, beams, and balconies in salt-air Miami

Seawall and Shoreline Stabilization

Cap repair, panel replacement, tieback and grouting work on waterfront Miami properties

Foundation and Block Wall Crack Repair

Epoxy and polyurethane injection for cracked stem walls, slabs, and CBS block

Get a free quote on foundation work in Miami

Call (786) 841-1091 or send the quote form. Tell us the property location and what you are seeing at the house, and the rest is a conversation.

Call (786) 841-1091 Send the quote form