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Intumescent Fireproof Coating Volume Calculator

Calculate the intumescent fireproofing material needed to achieve a target dry film thickness on structural steel.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax

Intumescent coating volume needed

9.59 gal

Check your inputs

The dry film thickness required for a specific fire-resistance rating depends on the steel section's size factor (Hp/A) and is set by the manufacturer's UL-listed DFT tables for your exact rating and steel profile — this calculator only converts a DFT you already know into material volume, it does not determine the required DFT itself.

Required wet film thickness
35.71 mils

At the values currently entered, the intumescent coating volume needed works out to 36.3. Note that steel surface area sits at the low end of the range this calculator was checked against, so treat the output as indicative rather than settled. Confidence is moderate: the method is sound, but real materials and site conditions vary. Figures are shown for United States, where IRC 2024 is the governing residential reference; switch the market above if you are building elsewhere.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Wet film thickness = target dry film thickness ÷ product solids content; material volume = steel surface area × wet film thickness — the same wet/dry film relationship used for any solvent/water-based coating

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Frequently asked questions

Why do I need to account for solids content at all?
Intumescent coatings lose volume as solvent or water evaporates during cure. If a product is only 70% solids, roughly 30% of the wet film's volume evaporates away, so the wet film applied must be thicker than the required dry film to reach the target dry thickness.
How do I know what dry film thickness I need?
The required DFT is not something this calculator determines — it depends on your steel section's size factor (Hp/A) and the fire-resistance rating specified, and must be read from the manufacturer's UL-listed DFT tables for your exact product and steel profile.
Does this calculator verify UL listing or code compliance?
No — it only converts a known target dry film thickness and surface area into an estimated wet material volume. Fire-resistance compliance depends on using a UL-listed intumescent system applied at the manufacturer's specified DFT for your steel profile.