Intumescent paint is a fire-protective coating that expands 50–200 times its thickness when exposed to heat, forming an insulating char layer that protects the substrate from reaching critical failure temperatures. It is required by code for exposed structural steel in many commercial and multifamily applications.
Smooth applies intumescent coatings to structural steel beams, columns, and connections throughout Boston-area commercial and multifamily projects. We are experienced with both thin-film (STI/Nullifire) and thick-film systems for 1-hour, 2-hour, and 3-hour fire ratings.
Protects steel from reaching 550°C critical temperature — when steel loses structural strength
Available for all standard code-required fire resistance ratings
Allows exposed structural elements to remain visible while meeting fire code
UL-listed systems for code compliance and insurance acceptance
Required fire rating confirmed. Substrate conditions assessed.
Steel cleaned and primed per manufacturer requirements.
Intumescent coating applied in required number of coats to achieve specified dry film thickness.
Dry film thickness measurements documented for code compliance.
Response within 2 hours. Mass Save® eligibility reviewed on every quote.
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