Structural Fireproofing Thickness Calculator

Estimate fireproofing thickness for structural steel based on section type, W/D ratio, and required rating.

Type of structural steel member to be fireproofed.
Weight-to-heated-perimeter ratio (lb/ft per in.). Higher W/D = less fireproofing needed. Typical range: 0.5-3.0.
lb/ft/in
Required fire resistance rating for the structural member.
Type of fire-resistive material (SFRM) to be applied.

Results

Required Thickness-mm
Required Thickness-inches
Coverage Area per Meter-m²/m
Material Quantity (per meter)-L/m
References: UL Fire Resistance Directory, IBC Section 722, ASTM E119.