If a wide flange column requires 2 inches of SFRM thickness, what is the minimum allowable individual thickness measurement?

In determining the minimum allowable individual thickness measurement for Spray-Applied Fire-Resistive Material (SFRM) on a wide flange column that requires a total of 2 inches of thickness, it is essential to account for how SFRM is applied. The application typically allows for some variability in thickness to ensure consistency and reliability in fire resistance, while still meeting the minimum requirement.

The correct choice reflects a reasonable tolerance based on the necessity for ensuring that the applied material achieves its expected performance. When applying fireproofing material, it’s common practice to ensure that individual thickness measurements do not fall below a certain threshold, which could compromise the integrity and effectiveness of fire protection.

In this scenario, a minimum individual thickness measurement of 1-3/4 inches is acceptable, as it allows for slight variations in application while still ensuring that when combined the total thickness meets the designed requirement of 2 inches. This ensures that adequate fire protection is provided without the risk of under-application that could result in reduced fire resistance.

The other thickness options do not provide the same balance between compliance with minimum thickness requirements and practical application standards. An individual measurement that is too low may lead to insufficient fire protection, while adhering strictly to the 2 inches without