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Rockland Foundation Co

Service

Foundation and Block Wall Crack Repair in Miami

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

Not every crack needs piers. A large share of the cracks Miami homeowners find, stair-step cracks through stucco at a corner, a hairline running down a stem wall, a crack across a garage slab, are either non-structural or are structural but stable. The right response depends on which. A crack that is stable and dry gets structurally rebonded with epoxy injection or sealed with polyurethane if water is coming through it. A crack that is still moving gets diagnosed first, because injecting a live crack just moves the failure an inch to the side. Most Miami crack repair jobs run $500 to $3,000. The important part of this scope is not the injection, it is the assessment that decides whether injection is the answer at all.

What is included

  • Crack monitoring with gauges where movement is in question, typically over 30 to 90 days
  • Epoxy injection to structurally rebond a stable crack in concrete
  • Polyurethane injection where the crack is a water path rather than a structural one
  • Carbon fiber or steel reinforcement across cracks in block walls where the engineer calls for it
  • Stucco repair and finish matching over the completed injection
  • Grade and drainage correction at the wall, because standing water at a footing is a repeat cause
  • Honest triage: a cosmetic crack gets called a cosmetic crack

Common questions about crack repair

Which foundation cracks are serious and which are not?

Width, direction, and change over time are the three things that matter. Hairline vertical cracks in stucco or a slab, under about 1/16 inch and not growing, are usually shrinkage and cosmetic. Stair-step cracks following the mortar joints in a block wall, cracks wider than about 1/4 inch, cracks that are wider at one end than the other, cracks with a step or offset across them, and doors or windows that have stopped closing, all point at movement. The clearest signal of all is a crack that is measurably wider three months after you first marked it.

What does foundation crack repair cost in Miami?

Most crack repair jobs run $500 to $3,000. A single epoxy-injected crack in a stem wall or slab is commonly $500 to $1,200 including surface preparation and finish. Several cracks on one wall run $1,500 to $3,000. Adding carbon fiber reinforcement across a block wall adds roughly $400 to $900 per strip. If the assessment concludes the wall is still moving, injection is the wrong scope and the conversation moves to underpinning, which is a different order of cost.

What is the difference between epoxy and polyurethane injection?

Epoxy is a rigid, high-strength adhesive that structurally rebonds the two faces of a crack, so the repaired concrete is as strong as it was. It needs a dry, clean crack and a stable one. Polyurethane is a flexible foam that expands on contact with water and seals the crack against leakage. It does not restore strength, but it works in wet cracks and tolerates a small amount of continued movement. Structural crack in dry concrete, use epoxy. Water coming through, use polyurethane.

Are stair-step cracks in a CBS wall always a foundation problem?

Not always, but they are worth taking seriously, because a stair-step crack means the wall has moved along the weakest path through it, and something below or beside it moved first. Sometimes the cause is a settled footing. Sometimes it is a lintel over an opening, a corner with no bond beam continuity, or thermal movement in a long unrelieved wall. The difference matters because the repairs are completely different, which is why crack monitoring and an elevation survey come before anyone quotes piers.

Related Reading

More on crack repair in Miami-Dade

What a Boring Log Tells You

On a piering job the pier count and the depth to competent bearing are the price, and both come from a subsurface investigation. What one shows and how to read it.

Most of Miami's Rain Falls in Six Months

NOAA puts Miami at 67.41 inches of rain a year with more than three quarters of it between May and October. That is why drainage problems here are seasonal.

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 Slab Leveling and Void Filling

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

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

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