How thick should epoxy be on a garage floor?

Most professional garage floor systems build up to somewhere between 20 and 40 mils total, depending on the number of coats and whether a flake broadcast is used, though the exact number matters less than most people expect. A single, ultra-thick DIY pour isn’t necessarily better than a properly layered professional system, since durability comes from bonding to well-prepped concrete and using the right number of coats for the traffic the floor will see. Commercial and heavy-use garages sometimes call for a thicker build, while a standard residential garage does fine with a standard two to three coat system. The mil thickness is really a byproduct of doing the layering correctly, not a number to chase on its own.

Not sure what build makes sense for your garage? Ask our team to recommend a St. Louis epoxy flooring system based on how you actually use the space.

Not necessarily. Durability comes more from proper surface prep, the right number of coats, and quality materials than from raw thickness alone. A well-prepped, correctly layered standard system often outperforms an ultra-thick coating applied over concrete that wasn’t ground or moisture-tested first.