How thick is an epoxy floor coating?
Most epoxy floor coatings finish between 10 and 40 mils thick, depending on the system, and industrial floors run far thicker. Sherwin-Williams places professional-grade systems at 0.020 to 0.250 inches, which is 20 to 250 mils. One mil is a thousandth of an inch. Total dry film across every coat is the number that matters.
We coat floors across Pinellas, Hillsborough and Pasco counties, plus the city of Sarasota. Most of what we install is a full-broadcast flake system. That means a base coat, a heavy flake broadcast, then a wear coat on top. Your quote lists each coat by name.
What is a mil, and why do coatings count them?
A mil is one thousandth of an inch, and every coating data sheet uses it. ArmorGarage puts oil-based enamel paint at about 2 mils thick. Paper is about 4 mils on the same ArmorGarage scale. A credit card is about 30 mils, per ArmorGarage, and that is a thick floor coating.
Two numbers show up on data sheets. Wet film thickness is what the roller or squeegee leaves behind. Dry film thickness, shortened to DFT, is what stays after the coating cures.
For a buyer, the dry number is the one to read. A quote that promises mils should mean cured build across the whole system.
How thick is an epoxy floor by system?
Thickness tracks the product family more than the brand. Water-based kit coatings dry to a few mils per coat. A 100 percent solids epoxy holds far more in one pass. Sherwin-Williams notes the film thickness can be 10 mils or more. Flake and industrial systems stack coats to go higher.
| System | Published dry film thickness | What it is for | Publisher |
|---|---|---|---|
| Water-based epoxy kit coating | 3.0-3.5 mils per coat | color and light duty protection | Rust-Oleum (EpoxyShield data sheet) |
| Water-based commercial epoxy | 2.0 to 4.0 mils dft per coat | light traffic commercial floors | Sherwin-Williams (ArmorSeal 8100 data sheet) |
| Thin film epoxy coating | 4-6 mils | low traffic rooms and storage | ArmorPoxy |
| 100 percent solids epoxy | 10 mils or more per coat | base coats under flake and quartz | Sherwin-Williams |
| Polyaspartic topcoat | 6 to 10 mils wet per coat | UV stable wear coat | Deco-Crete Supply (Polyaspartic 90 data sheet) |
| Home garage coating system | 20 mils total build | cars, tools, foot traffic | ArmorGarage |
| Commercial epoxy system | 10 to 20 mils, two to three coats | retail, showrooms, shops | ArmorPoxy |
| Industrial and forklift traffic | 20-30 mils, or 0.375 inches with aggregate | warehouses and plants | ArmorGarage and Sherwin-Williams |
Most home work lands in the middle of that table. A garage floor epoxy system carries more build than a painted floor, because cars are hard on coatings. If you are weighing interlocking tiles instead, read tiles versus a coating for a Florida garage. Heavy plants go the other way. Sherwin-Williams notes that heavy duty systems can be installed at thicknesses of 0.375 inches or greater.
Why is the wet film thicker than the dry film?
Solids content decides how much of what you roll on actually stays. Sherwin-Williams explains that a wet film of 7 mils may result in a dry film of 3 to 3.5 mils. That drop applies to products carrying water or solvent. A 100 percent solids product has almost nothing to give up.
The Rust-Oleum EpoxyShield water-based data sheet shows the same math on a garage product. It lists a recommended dry film of 3.0-3.5 mils per coat from 6.0-7.0 mils applied wet.
That gap is why two quotes can both say “two coats” and end up as very different floors. Ask what the solids content is, then ask what the cured build works out to.
How thick is a full broadcast flake floor?
A full broadcast flake floor is thick because it is built from stacked layers. Concrete Decor starts the stack with about 10 mils of an epoxy basecoat. Installers then broadcast between 8 and 20 mils of vinyl flakes by hand, per Concrete Decor. Concrete Decor closes with about 10 mils of polyaspartic or polyurethane topcoat.
| Layer | Published thickness | Publisher |
|---|---|---|
| Epoxy base coat | about 10 mils | Concrete Decor |
| Vinyl flake broadcast | between 8 and 20 mils | Concrete Decor |
| Polyaspartic or polyurethane topcoat | about 10 mils | Concrete Decor |
Add those Concrete Decor layers and a full broadcast floor lands in the high 20s to around 40 mils. A heavier broadcast means a thicker floor and more texture underfoot. Sherwin-Williams gives a wider band for the category, stating that most epoxy flake floor coatings range from 10-250 mils.
Flake size changes the feel more than the total. Sherwin-Williams lists macro blends that feature 1/4-inch chips, the size most garages get. Our post on how a full broadcast flake floor is layered walks through the same stack.
Is a thicker epoxy floor always better?
Up to a point. Thickness buys abrasion life and impact resistance. ArmorGarage ties thin coatings directly to hot tire pickup, since they lack the mass to absorb heat from tires. Past that point, prep decides everything. Sherwin-Williams links correct thickness to the condition of the concrete underneath.
A thick coat over a slick, unground slab still comes loose. That is why we diamond grind every floor. A ground surface gives the base coat a profile to key into.
Thickness also will not bridge a moving crack. We repair cracks and spalls first, then coat. For the longer version, read why epoxy floors peel in Florida and how long a coated floor lasts in Florida.
What does Florida do to a thin coating?
Three local conditions punish thin film. Slab moisture pushes vapor up through the concrete, which lifts and blisters a thin coat from below. Afternoon heat means hot tires. Sun on an outdoor slab ambers plain epoxy, and only a UV stable topcoat changes that.
Vapor is the one we test for. We run moisture testing before quoting, because a slab that reads high needs a different plan. Sherwin-Williams notes that moisture and salts trapped under a coating cause blistering and adhesion failures.
Sunlight is a chemistry problem, so we answer it with chemistry. A UV stable polyaspartic floor coating or urethane goes on outdoor slabs. The Deco-Crete Polyaspartic 90 data sheet describes that class as UV stable and high solids. The resin difference is covered in epoxy vs polyaspartic.
How do you read mils on a quote?
A good coating proposal names the coats in order and the products behind them. It also states the cured build the system targets. Ask for the solids content of each product. Ask what the topcoat is, because that decides UV behavior and wear. Ask how heavy the flake broadcast runs.
Flake density belongs on the page too. A full broadcast means flake goes down until the base coat will not take any more. That is what puts a floor at the high end of the published range. A light scatter of flake reads as a color accent and adds little build.
For commercial epoxy flooring, ask what the floor has to survive. ArmorPoxy states that floors between 10 and 20 mils thick are the most common for commercial use. Those usually run two to three coats, per ArmorPoxy. Material cost climbs with build, and our guide to epoxy flooring cost in Tampa covers what drives the number.
Ready for a real number on your floor?
Thickness is decided by your slab, your traffic and the system you choose. We grind, repair and moisture test, then build the coats your floor needs. The quote spells out every layer and the cure timeline. Slabs across Tampa Bay read differently, so we look at yours first.
Call (727) 423-5985 for a free on-site quote anywhere in Pinellas, Hillsborough or Pasco County, or in Sarasota. You can also browse our full list of services to see which system fits the space.