Why Does Concrete Crack in Miami? Limestone, Heat and Rain
Miami Precision Concrete sees the same causes in most cracked slabs: rain washes out fill, roots push up, or joints, base or curing are missing.
A hairline along a control joint is normal.
Cracks that widen or lift are the problem.
Why Choose Miami Precision Concrete
- Licensed & Insured
- Years of experience pouring residential and commercial concrete
- Proper reinforcement on every pour
- Written warranty on workmanship
- Local crew, local reputation
- On-time, on-budget completion
- Free, no-obligation estimates
- Wide range of finishes
- Proper site prep and drainage grading
- Clean job sites
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Why Concrete Cracks in Miami, FL
The Truth About Miami Limestone
Miami-Dade sits on oolitic limestone with sandy fill and a high water table. The Florida Building Code sets HVHZ rules, but fill decides settling.
Loose fill washes out, so slabs settle and crack.
Runoff Is the Usual Culprit
Miami gets about 60 inches of rain a year.
- Downspouts at the slab edge
- Yards sloping toward the slab
- Street flooding onto the apron
- Gaps where water carries sand away
Low lots in Hialeah and Miami Beach see it most.
Tree Roots and Salt
Ficus roots lift panels. Near the coast, chloride rusts rebar, which splits concrete.
Coral Gables protects its canopy; see driveway permits in Miami.
Heat, Rain and Curing
Hot pours dry too fast and crack. We pour early and use retarders.
The American Concrete Institute calls for 7 days of moist curing. Storms scar fresh pours.
Thin Slabs and Missing Joints
Control joints decide where cracks go. Space them 8 to 12 feet on a 4-inch driveway.
Cars need 4 inches. Trucks and RVs need 5 to 6, plus base and steel.
Which Cracks to Fix
Hairline Cracks
Stable cracks are cosmetic. Sealing runs $3 to $8 per square foot.
Sunken or Tilted Panels
A dropped section can be lifted with concrete leveling and mudjacking.
Broken or Rusted Slabs
These come out. We rebuild the base and repour a concrete driveway, sidewalk or walkway or patio; a retaining wall holds raised grade.
Have Us Look at Your Cracks
A site visit usually shows the cause. Call (786) 305-3443.