Crack Repair (Epoxy Injection)
Concrete cracks are the most common concrete repair scope — and the most variable in terms of cause and appropriate repair. A hairline shrinkage crack in a residential driveway is a different problem than a structural crack in a second-floor balcony slab in a Miami Beach condominium, and the repair methods are completely different. Our crack repair scope runs from simple surface sealant applications on residential slabs to full structural epoxy injection on load-bearing walls and elevated slabs with engineering supervision. Epoxy injection is the gold-standard structural crack repair for cracks up to about 1/4 inch wide where structural load transfer across the crack needs to be restored. The process uses a low-viscosity structural epoxy (two-part, typically 50% solids or higher) injected under pressure through ports bonded along the crack face. The epoxy penetrates the full depth of the crack, wetting out the crack faces and curing to restore the concrete section to its original tensile capacity — often stronger than the surrounding concrete. Port spacing depends on crack width and depth, typically 6 to 12 inches on center along the crack length. After injection, the ports are removed and the surface is ground flush. We inject cracks on structural walls, elevated slabs, beams, columns and foundation walls across South Florida, always in coordination with the engineer of record on any structural element. For non-structural cracks — shrinkage cracks, surface cracks in flatwork, map cracking from over-trowelling — we use lower-cost sealant repair methods. Polyurethane foam sealants for wet cracks that leak, elastomeric polyurethane or silicone for surface cracks that need to remain flexible, and rigid methyl methacrylate (MMA) sealants for cracks that need a hard, traffic-ready surface. Every crack repair project starts with crack assessment — width, depth, pattern, cause — and a written recommendation of the appropriate repair method. Homeowners across Broward and Miami-Dade often call us for residential driveway crack repair; property managers call us for condo and commercial repair work; general contractors call us for warranty-period crack repair on recent construction.
Common Applications
- Structural epoxy injection on load-bearing walls, beams and slabs
- Foundation wall crack repair on residential and commercial buildings
- Balcony and elevated slab crack repair on condominium and multifamily
- Residential driveway, patio and pool deck crack sealing
- Parking garage deck crack repair with structural and waterproofing demands
- Swimming pool structural crack repair (specialty, requires pool-grade epoxy)
- Retaining wall crack repair with structural and drainage considerations
- Warranty-period crack repair on new construction
Technical Specs & Details
- Structural epoxy: two-part, low-viscosity, 50%+ solids (ASTM C881 Type IV)
- Injection ports at 6–12 inches on center depending on crack geometry
- Low-pressure injection: 40–60 psi typical; high-pressure for deep cracks
- Surface seal along crack face with thicker paste epoxy before injection
- Polyurethane foam sealant for active water-infiltration cracks
- Elastomeric sealants for non-structural surface cracks that need flexibility
- Crack mapping and documentation on commercial and structural work
- Engineering coordination mandatory on any structural crack in a structural element