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// CODE SNIPPET

722.5.2.2.1 Minimum Thickness

Building Code 2018 of Illinois > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.5 Steel Assemblies > 722.5.2 Structural Steel Beams and Girders > 722.5.2.2 Sprayed Fire-Resistant Materials > 722.5.2.2.1 Minimum Thickness

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The use of Equation 7-17 is subject to the following conditions:

The weight-to-heated-perimeter ratio for the substitute beam or girder (W₂/D₂) shall be not less than 0.37.
The thickness of fire protection materials calculated for the substitute beam or girder (T₁) shall be not less than ³/₈ inch (9.5 mm).
The unrestrained or restrained beam rating shall be not less than 1 hour.
Where used to adjust the material thickness for a restrained beam, the use of this procedure is limited to structural steel sections classified as compact in accordance with AISC 360.

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