Concrete Crack & Joint Repair

Concrete crack and joint repair is the process of restoring damaged, cracked, or spalled concrete to a sound, monolithic condition before coating or polishing. Cracks in concrete are inevitable — they result from shrinkage during curing, thermal expansion and contraction, settling, or structural loads. Left unaddressed, cracks propagate, collect debris, and compromise the appearance and performance of your finished floor.

We use a range of repair methods depending on the type and severity of the damage:

• Epoxy injection for structural cracks — restores the concrete's original strength • Semi-rigid polyurea joint fillers for control joints — flexes with slab movement • Epoxy mortar patching for spalls and pop-outs — cosmetic and structural repair • Rout-and-seal for active cracks — prevents further propagation

Every repair is designed to create a seamless surface that works with your chosen coating or polishing system.

Hairline Cracks (1/16" or less): Surface-level cracks from curing shrinkage. Routed, cleaned, and filled with low-viscosity epoxy or polyurea filler.

Structural Cracks (1/8" to 1/4"): Cracks that extend deeper into the slab. Repaired with epoxy injection under pressure to restore structural integrity.

Spalls & Pop-Outs: Chipped or flaking concrete from impact, freeze-thaw, or aggregate reaction. Cleaned, primed, and filled with epoxy mortar matched to the surrounding concrete.

Control Joints (Saw Cuts): Intended separation joints that collect debris and widen over time. Filled with semi-rigid polyurea joint filler that flexes with slab movement.

Settling & Step Cracks: Cracks with vertical displacement from slab settling. Requires grinding or patching to level the surface.

Cracks and joints that are not properly repaired before coating will telegraph through the new system. Within months, you'll see the crack lines reflected in your new epoxy or polished concrete floor. Worse, cracks that continue to move can rupture the coating itself — leading to peeling and delamination that spreads from the crack line.

Proper crack repair does three things:

1. Stops crack propagation — The repair material bridges the crack and prevents further movement.

2. Creates a seamless surface — The finished floor shows no evidence of the underlying crack or joint.

3. Protects the coating — A stable substrate prevents the coating from stress-cracking at repair lines.

Skipping crack repair is one of the most common mistakes in DIY and budget floor installations. The repair cost is small compared to the cost of a failed floor.

1. Assessment: We identify all cracks, joints, spalls, and damaged areas. Each is categorized by type and severity to determine the appropriate repair method.

2. Cleaning & Routing: Cracks are routed (widened slightly) to create a clean channel for the repair material. All debris, dust, and loose concrete are removed.

3. Epoxy Injection (Structural Cracks): For deeper cracks, low-viscosity epoxy is injected under pressure to penetrate the full depth of the crack and restore structural integrity.

4. Joint Filler (Control Joints): A backer rod is placed in deep joints, then semi-rigid polyurea filler is applied flush with the surrounding concrete. The filler flexes with slab movement but stays bonded to the joint edges.

5. Spall Repair: Damaged areas are cleaned, primed, and filled with epoxy mortar. The patch is struck off flush and allowed to cure.

6. Grinding & Smoothing: All repairs are diamond-ground to achieve a perfectly flat, seamless surface ready for coating or polishing.

How much does concrete crack repair cost in Tampa Bay? Crack repair costs vary by type and quantity. Hairline crack filling typically ranges from $2–$5 per linear foot. Structural epoxy injection ranges from $5–$15 per linear foot. We provide free on-site evaluations.

Can cracks be repaired in existing coated floors? Yes — the coating must be removed in the area of the crack, the crack repaired, and the coating re-applied. This is common when restoring failed epoxy floors.

Will repaired cracks show through the new coating? No — properly repaired cracks are invisible under new coating or polishing. The repair material is flush with the surrounding concrete and sanded smooth.

How long does crack repair take? For a standard residential garage, crack and joint repair typically takes 2–4 hours. Repairs must cure before coating, which is usually overnight.

Do cracks always need to be repaired before coating? Yes — any crack or joint that collects debris or shows movement must be repaired. Hairline cracks that are tight and stable may be acceptable for some coating systems, but we err on the side of repairing everything.