Sources & Methodology (2026)

1. 2,250 US contractors and 48 published $/sq ft benchmarks

The 2026 directory covers 150 US metropolitan areas, with 15 vetted concrete-coating installers per metro (150 × 15 = 2,250 contractors). Each listing records the business name, homeowner rating, review count, service area, and whether the public profile offers polyaspartic/polyurea, a full flake broadcast, 3D metallic epoxy, mechanical diamond grinding, a moisture vapor barrier, or a 1-day turnaround.

A follow-up read of installer websites enriched 440 of those profiles. That pass found 48 published price benchmarks: a stated dollars-per-square-foot band, or a published garage package price when no $/sq ft figure was posted. Metro pages show the floor and ceiling of those published $/sq ft figures when a city has them. When a city has none, the page says so and shows the modeled local index for that metro.

Regional labor multipliers on each metro page scale the national baseline. The national 2-car garage (440 sq ft) planning midpoint used for comparisons is $3,200. A city's 2-car figure is also compared with the average 2-car cost of every metro this directory publishes in the same state.

2. The 1,604 cubic-inch resin coverage rule

One US gallon is 231 cubic inches. One mil of dry film is 0.001 inch thick. Spread across that thickness, 231 cubic inches covers 231 ÷ 0.001 = 231,000 square inches. Dividing by 144 square inches per square foot gives 1,604.17 square feet at 1 mil dry film thickness (DFT) for a 100% solids resin:

1 US gal = 231 in³ = 1,604.17 sq ft @ 1 mil DFT
Gallons = (floor sq ft × target mils) ÷ (1,604.17 × volume solids) × (1 + waste)

The calculator uses this rule for primer, body coat, moisture-mitigation primer, and polyaspartic topcoat takeoffs, then rounds up to whole retail kits (2-gallon primer and topcoat kits, 3-gallon body-coat kits) and adds the selected waste buffer for slab porosity. A lower solids fraction, such as an 85% solids polyaspartic, covers fewer square feet per gallon at the same wet mils because solvent or water leaves the film. Flake quantity is separate from the gallon rule: a full broadcast to rejection is specified at 0.12 lb per square foot.

3. CSI MasterFormat 09 67 23 — labor, material, and the crew floor

Resinous flooring is specified under CSI MasterFormat 09 67 23. The turnkey estimate splits that section into labor and material instead of quoting a single blended rate:

• Labor / preparation. Mechanical diamond grinding starts at $1.60 per square foot before the metro labor multiplier and the small-job volume factor. Extra slab repairs (spalls, failed coatings, joints) are added on this line.
• Material / resin system. The coating line is the installed system above that $1.60 grind baseline, using the midpoint of the published system band (solid color, flake, polyaspartic, metallic, quartz, or urethane mortar), again adjusted by labor multiplier and job size.
• Crew mobilization floor. A one-day crew call-out is floored at $1,650 × the metro labor multiplier, rounded to the nearest $10. If grinding, the resin system, and stem walls add up to less than that floor, the difference is added as mobilization so a small garage is not priced below the cost of sending a crew.

Moisture-vapor primers, stem walls, sanitary cove, steps, polyurea joint fill, and anti-slip grit are itemized separately so a bid can be compared line by line against 09 67 23 scope rather than as one lump sum.

4. ICRI CSP-2/3 diamond grinding and ASTM moisture testing

ICRI CSP-2 and CSP-3 (International Concrete Repair Institute concrete surface profile) are the grind profiles this site requires before a resinous floor is coated. CSP-2 is a light grind, similar to a fine sandpaper profile. CSP-3 is a medium grind, the profile specified here for flake and polyaspartic systems so the primer can wet into open pores. Acid etching and a pressure wash do not produce a uniform CSP-2/3 profile and are treated as a failed prep spec.

ASTM F1869 measures moisture vapor emission rate with a calcium chloride test, reported in pounds of water per 1,000 square feet per 24 hours. Many standard epoxy systems are limited near 3 lb when the slab is above that rate, unless the scope adds a moisture-mitigation primer.

ASTM F2170 measures relative humidity inside the slab with in-situ probes. Standard thin-film epoxies are commonly limited near 75% internal RH. A higher reading belongs in the written scope as a moisture vapor barrier, not as a surprise change order after the grind.

Metro pages, the bid checklist, and the calculator all use these same four rules. Open the cost calculator or browse the 150-city directory.