How thick an epoxy floor should be depends on the system and the traffic. Enter the wet film you plan to spread to see the dry film that stays on the floor, then compare it with the ranges for each system below.
Default dimensions, allowances and prices are example inputs. Replace them with your measurements and product label. Leave unknown product limits blank.
Dry film per coat
Enter the wet film and volume solids to see the dry thickness.
Working
Next Step
Use the estimate to narrow the resin class first. Then confirm product limits, cure behavior, and measurement assumptions before you make a buying decision.
Direct Answer
Most epoxy floors are between 3 mils and 1/4 inch thick. A water-based garage kit dries to about 3 mils per coat, and a professional thin-film system of primer and topcoat totals about 11 to 25 mils (0.3 to 0.6 mm). Self-leveling epoxy goes down at 62 to 125 mils (1.6 to 3.2 mm), and forklift areas often get 1/4 inch (6 mm) of aggregate-filled mortar.
Takeaways
Per-coat values are for one layer. System values include the primer, body coats, and topcoat.
| System | Thickness | Metric | Typical use |
|---|---|---|---|
| Water-based DIY garage kit | 3–3.5 mils dry per coat (6–7 mils wet) | 0.08–0.09 mm | Light residential garages; Rust-Oleum EpoxyShield data sheet |
| Epoxy primer | About 8 mils | About 0.2 mm | Bond coat under thicker systems; Sika MultiDur SL |
| Flake broadcast base coat | About 10 mils wet | 0.25 mm | Holds the vinyl chips before the clear topcoat; Miracote |
| Thin-film system (primer, optional mid coat, topcoat) | 11–25 mils total | 0.28–0.64 mm | Garages and light to moderate traffic; Sherwin-Williams |
| Self-leveling smooth epoxy | 62–125 mils | 1.6–3.2 mm | Seamless smooth floors; Sika MultiDur SL |
| Self-leveling broadcast slurry | 125–156 mils | 3.2–4.0 mm | Textured, slip-resistant floors; Sika MultiDur SLB |
| Aggregate-filled mortar | 1/4 in (250 mils) | About 6.4 mm | Forklifts and heavy machinery; Sherwin-Williams |
| Heavy-duty systems | 3/8 in (375 mils) or more | 9.5 mm and up | Heavy loads and impact, with grout coats and topcoats; Sherwin-Williams |
Sherwin-Williams puts most professional systems between 20 and 250 mils. Use the data sheet of the exact product for per-coat limits and recoat windows.
The thickness you spread is the wet film. What stays on the floor after the water or solvent leaves is the dry film, and data sheets usually specify that number. A 100% solids epoxy keeps its full wet thickness. Rust-Oleum's water-based EpoxyShield is 52.6–52.8% solids by volume, so 6–7 wet mils dry to 3–3.5 mils.
| Coating | Wet film | Volume solids | Dry film | Coverage per gallon (wet) |
|---|---|---|---|---|
| 100% solids epoxy, thin coat | 10 mils | 100% | 10 mils (0.25 mm) | 160 sq ft |
| 100% solids epoxy, heavy coat | 20 mils | 100% | 20 mils (0.51 mm) | 80 sq ft |
| Water-based kit (EpoxyShield) | 6.5 mils | 52.7% | 3.4 mils (0.09 mm) | 247 sq ft |
| 50% solids coating | 20 mils | 50% | 10 mils (0.25 mm) | 80 sq ft |
One US gallon spread 1 mil thick covers about 1,604 sq ft. Coverage = 1,604 ÷ wet mils, before waste. Tabletop and deep-pour thicknesses are in the epoxy coverage chart.
| Mils | Inches | Millimeters |
|---|---|---|
| 3 mils | 0.003 in | 0.08 mm |
| 10 mils | 0.01 in | 0.25 mm |
| 20 mils | 0.02 in | 0.51 mm |
| 62 mils | 0.062 in | 1.57 mm |
| 125 mils | 0.125 in | 3.18 mm |
| 250 mils | 0.25 in | 6.35 mm |
| 375 mils | 0.375 in | 9.53 mm |
Thickness ranges come from manufacturer system data and technical articles. Contractor blogs give wider ranges that often contradict each other, so this page does not use them.
Square feet, coats, and the coverage on your kit label turned into gallons and kits.
Pounds of vinyl flake and boxes for full or partial broadcast.
Square feet per gallon from 5 mils to 1 inch, including tabletop and deep pours.
FAQ
A water-based DIY coat is about 0.08 mm per coat after it dries. A professional thin-film system of primer and topcoat totals about 0.3 to 0.6 mm (11 to 25 mils). Self-leveling epoxy is 1.6 to 3.2 mm.
It depends on the load. Busy floors with foot traffic and carts can use a thin system with an abrasion-resistant topcoat. Areas with forklifts or heavy impact usually get an aggregate-filled system around 1/4 inch, and heavy-duty floors 3/8 inch or more.
No. Thickness helps with impact, heavy loads, and uneven concrete, but a floor also needs the right prep and topcoat. Spreading one coat much thicker than its data sheet allows can trap bubbles or cause cure problems.
The measured film comes from the base coat and the clear topcoat. The chips add texture and help hide the slab. The flake calculator works out the pounds of flake separately.
Related Pages
How much epoxy a garage or basement floor needs: turn square feet, coats, and your kit's coverage rate into gallons and kits to buy, with waste and material cost.
How many pounds of flake for an epoxy floor: about 12.5 lb per 100 sq ft for a full broadcast of 1/4 in chips. Full or partial broadcast, flake size, and boxes to buy.
Epoxy garage floor cost: $4–$10 per sq ft installed, about $1,600–$4,000 for a 400 sq ft 2-car garage. Compare DIY kits, flake, metallic, and polyaspartic.
How thick is epoxy? Typical thickness for garage floors (10-20 mils), tabletops (1/8 inch), and deep pours, plus square feet per gallon at every thickness.
Understand how far a gallon of epoxy goes by coat thickness, coverage rate, surface type, and waste assumptions.
Reviewed · Calculation notes and corrections