Types of Concrete Cracks in Katy TX Garage Floors

Shrinkage Cracks

The most common crack type — fine, random, map-like cracking (also called crazing or spider cracks) that occurs as concrete cures and dries. These are typically less than 1/16" wide and don't affect structural integrity. For epoxy, they're filled with a low-viscosity penetrating sealer or left as-is if the epoxy system has sufficient film build to bridge them. No structural concern.

Control Joint Cracks

Most garage slabs have intentional control joints — sawcut or tooled lines that direct cracking to a predictable location. Cracks along control joints are expected and normal. They do require treatment before epoxy: polyurea joint filler installed at the proper hardness (semi-rigid, not rigid) to allow continued movement without telegraphing through the coating.

Settlement and Differential Cracks

These are the cracks to take seriously. A step crack (one side higher than the other) indicates differential settlement — one section of the slab has moved relative to its neighbor. Wide cracks (>1/4") with displacement require evaluation before coating. In some cases, the soil beneath needs stabilization before the floor coating can be expected to last.

Thermal and Expansion Cracks

Katy TX temperature swings — hot summers, occasional freezes — cause concrete to expand and contract. Cracks that run parallel to long walls or diagonally from corners are often thermal. These are addressable with flexible polyurea filler and a crack-bridging topcoat system. The key is matching the filler flexibility to the expected movement range so it doesn't re-crack.