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// CODE SNIPPET

722.5.1.3 Spray-Applied Fire-Resistant Materials

NYC Building Code 2022 > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.5 Steel Assemblies > 722.5.1 Structural Steel Columns > 722.5.1.3 Spray-Applied Fire-Resistant Materials
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ILLUSTRATION
The fire resistance of wide-flange structural steel columns protected with spray-applied fire-resistant materials, as illustrated in Figure 722.5.1(5), shall be permitted to be determined from the following expression:



where:

R = Fire resistance (minutes).
h = Thickness of spray-applied fire-resistant material (inches).
D = Heated perimeter of the structural steel column (inches).
C1 and C2 = Material-dependent constants.
W = Weight of structural steel column (pounds per linear foot).
Exception: The fire resistance of structural steel columns protected with intumescent or mastic fire-resistant coatings shall be determined on the basis of fire-resistance tests in accordance with Section 703.2.

722.5.1.3.1 Material-Dependent Constants

The material-dependent constants, C1 and C2, shall be determined for specific fire-resistant materials on the basis of standard fire-resistance tests in accordance with Section 703.2. Unless evidence is submitted to the commissioner substantiating a broader application, this expression shall be limited to determining the fire resistance of structural steel columns with weight-to-heated-perimeter ratios (W/D) between the largest and smallest columns for which standard fire-resistance test results are available.

722.5.1.3.2 Identification

Spray-applied fire-resistant materials shall be identified by density and thickness required for a given fire-resistance rating.

Related Code Sections


722.5.1.3 Fire and Smoke Protection Features, Spray-Applied Fire-Resistant Materials
The fire resistance of wide-flange structural steel columns protected with spray-applied fire-resistant materials, as illustrated in Figure 722.5.1(5 ...
NYC Building Code 2022 > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.5 Steel Assemblies > 722.5.1 Structural Steel Columns > 722.5.1.3 Spray-Applied Fire-Resistant Materials
721.5.1.3 Fire and Smoke Protection Features, Spray-Applied Fire-Resistant Materials
The fire resistance of wide-flange structural steel columns protected with spray-applied fire-resistant materials, as illustrated in Figure 721.5.1(5 ...
NYC Building Code 2014 > 7 Fire and Smoke Protection Features > 721 Calculated Fire Resistance > 721.5 Steel Assemblies > 721.5.1 Structural Steel Columns > 721.5.1.3 Spray-Applied Fire-Resistant Materials
721.5.2.2 Fire-Resistance-Rated Construction, Spray-Applied Fire-Resistant Materials
The provisions in this section apply to unrestrained structural steel beams and girders protected with spray-applied fire-resistant materials. Larger ...
NYC Building Code 2008 > 7 Fire-Resistance-Rated Construction > 721 Calculated Fire Resistance > 721.5 Steel Assemblies > 721.5.2 Structural Steel Beams and Girders > 721.5.2.2 Spray-Applied Fire-Resistant Materials
721.5.1.3.2 Fire and Smoke Protection Features, Identification
Spray-applied fire-resistant materials shall be identified by density and thickness required for a given fire-resistance rating ...
NYC Building Code 2014 > 7 Fire and Smoke Protection Features > 721 Calculated Fire Resistance > 721.5 Steel Assemblies > 721.5.1 Structural Steel Columns > 721.5.1.3 Spray-Applied Fire-Resistant Materials > 721.5.1.3.2 Identification
722.5.1.3.2 Fire and Smoke Protection Features, Identification
Spray-applied fire-resistant materials shall be identified by density and thickness required for a given fire-resistance rating ...
NYC Building Code 2022 > 7 Fire and Smoke Protection Features > 722 Calculated Fire Resistance > 722.5 Steel Assemblies > 722.5.1 Structural Steel Columns > 722.5.1.3 Spray-Applied Fire-Resistant Materials > 722.5.1.3.2 Identification
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