Polyurea Crack Injection for Katy TX Garage Floors

Why Polyurea, Not Caulk or Epoxy Filler

Hardware-store crack fillers are either too rigid (standard epoxy filler) or too soft (silicone caulk). Rigid fillers bond aggressively to both sides of a crack — when the slab moves, the filler or the concrete around it fails. Silicone stays soft but doesn't accept epoxy coating (the epoxy won't stick). Polyurea hits the sweet spot: 100–400% elongation (it stretches with movement), bonds strongly to concrete, and accepts epoxy topcoats.

The Routing Debate

Some contractors "rout and fill" all cracks — meaning they grind a wider, more uniform channel before filling. For cracks wider than 1/4" or with irregular edges, routing creates better geometry for filler adhesion. For hairline cracks, low-viscosity polyurea penetrates without routing. Installers assess each crack individually rather than applying one method to everything.

Application Process

Polyurea is a two-component material mixed at the injection tip and applied with a specialty caulk gun or pressure injection system. It cures in 30–60 minutes (vs. 24+ hours for epoxy filler), allowing same-day grinding and coating. After cure, the filler is ground flush with the surrounding concrete to create a smooth, flat surface ready for coating.

Crack Return — Setting Expectations

In expansive clay soil like Katy TX, some cracks will return. Semi-rigid polyurea is designed to flex through those micro-movements without failing. However, a crack that moved 1/4" during original settling may move again in a severe drought-to-rain cycle. We explain this to every customer: installers repair cracks to the best current standard, but no filler eliminates the underlying soil movement. Full disclosure upfront.