What Is a Structural Fireproofing Selection Guide?
Fireproofing selection matches the protection to the exposure, the structure, and the architecture: spray-applied fire-resistive material (SFRM), intumescent coatings, concrete encasement, and board systems — each with the fire rating, the durability, and the appearance. The selection balances the hourly rating (the code's requirement), the environment (the corrosion, the impact, the weather), and the finished look (the exposed steel's intumescent vs. the hidden steel's spray).
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The fireproofing types
SFRM (the sprayed cementitious or mineral-fiber — the economical concealed protection; the thickness per the UL design; the durability limits — the impact and the moisture sensitivity), intumescent (the thin-film coating expanding in fire — the architectural exposed-steel solution; the DFT specifying the rating; the exterior-grade formulations for the weather), concrete encasement (the mass-concrete protection — the durable, impact-resistant; the composite action bonus), and boards (the calcium-silicate or gypsum — the clean-room and the finished-space solution).
Selection criteria
The hourly rating (the code's requirement — the assembly's UL/Intertek listing matching; the restrained vs. unrestrained ratings), the exposure (the exterior — the weather-resistant intumescent or the concrete; the corrosive — the compatible systems; the impact — the rigid protection where the steel gets hit), and the appearance (the exposed architecture — the intumescent's smooth finish; the concealed — the SFRM's economy). The adhesion (the primed steel's compatibility — the wrong primer delaminating the fireproofing — the submittal review catching it).
Inspection and maintenance
Thickness inspection (the depth gauges — the SFRM's thickness verified per the sampling; the intumescent's DFT measured), the adhesion testing (the bond — the fireproofing staying on in the fire), and the maintenance (the damaged fireproofing repaired — the tenant improvements' penetrations patched; the intumescent's topcoat maintained). The special inspection (the IBC's fireproofing inspection — the third-party verification). The selected system documented in the fireproofing schedule — the drawings' explicit schedule preventing the substitution.
The bottom line
Select fireproofing by rating (UL listings), exposure (weather/corrosion/impact), and appearance — SFRM for concealed economy, intumescent for exposed steel, concrete for durability. Inspect thickness and adhesion.
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