Epoxy is only as good as the concrete under it. In Katy, where slabs sit on expansive clay that swells and shrinks with our wet-dry cycles, cracks, spalls, and pitting are common — and they must be properly addressed before any coating goes down. Here is how professionals repair a damaged slab so the finished epoxy floor is smooth, sound, and built to last.
Why Katy Slabs Crack
Our region’s Beaumont Formation and Gulf Coast clays are expansive: they swell when wet and shrink when dry, and that constant movement stresses the slab above. Add normal concrete shrinkage during curing, settlement, and the occasional overload, and most older garage slabs develop cracks. Surface problems like spalling and pitting come from freeze events, de-icing chemicals tracked in, and surface fatigue. None of it means the slab is unusable — it means it needs proper repair before coating.
Diagnosing the Cracks First
Not all cracks are equal. Hairline shrinkage cracks are cosmetic and easily filled. Wider or offset cracks can signal ongoing movement and need a different approach. We assess each crack — width, depth, and whether the two sides sit at different heights — before choosing a repair method, because filling an active structural crack the wrong way just lets it telegraph back through the new floor.
How We Repair Cracks and Spalls
Our repair process generally includes:
- Routing and cleaning cracks to give the repair material something to grip.
- Filling with a rigid polyurea or epoxy crack filler that cures hard, can be ground flush, and bonds to the slab.
- Rebuilding spalled and pitted areas with a patching mortar troweled smooth.
- Diamond grinding the whole slab afterward to level the repairs and open the profile for the coating.
Treating Control Joints
Control joints are intentional cracks — they let the slab crack in a straight, planned line. Whether to fill them or honor them is a judgment call. Filling joints gives a seamless look but can lead to cracking if the slab moves; honoring them keeps the joint as a clean line in the floor. On our moving clay slabs we often recommend treating joints in a way that respects future movement, and we will explain the tradeoff for your specific floor.
Moisture: The Hidden Issue Behind Cracks
Cracks are also a pathway for moisture vapor, and our humid, high-water-table region drives plenty of it. We run ASTM moisture testing as part of prep; if the slab is wet, we address it with a mitigation primer so moisture does not later push the coating off around the repaired areas.
The Payoff: A Smooth, Lasting Floor
Done right, crack and slab repair disappears under the finished epoxy — you get a smooth, continuous floor with no telegraphing lines and a bond that lasts. Done wrong, or skipped, the old damage comes right back through the new coating. We do the repair properly so you only pay for the floor once.