If primer is used on a column beneath SFRM, the column web depth cannot exceed how many inches?

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Multiple Choice

If primer is used on a column beneath SFRM, the column web depth cannot exceed how many inches?

Primers are used to help sprayed fire-resistive material bond to steel surfaces, but when a primer is placed on a column beneath SFRM there is a tested limit to how deep the column web can be for reliable bonding and consistent fireproofing performance. The standard maximum is 16 inches. Staying at or below this depth keeps the primer–SFRM bond within the conditions that the coating system and installation guidelines assume, supporting proper adhesion, coating continuity, and the rated fire resistance. Choosing a smaller number, like 8 inches, would unnecessarily constrain typical column sizes. Larger numbers, such as 20 or 24 inches, exceed the tested and recommended limits and could compromise adhesion and the integrity of the fireproofing system.

Primers are used to help sprayed fire-resistive material bond to steel surfaces, but when a primer is placed on a column beneath SFRM there is a tested limit to how deep the column web can be for reliable bonding and consistent fireproofing performance. The standard maximum is 16 inches. Staying at or below this depth keeps the primer–SFRM bond within the conditions that the coating system and installation guidelines assume, supporting proper adhesion, coating continuity, and the rated fire resistance.

Choosing a smaller number, like 8 inches, would unnecessarily constrain typical column sizes. Larger numbers, such as 20 or 24 inches, exceed the tested and recommended limits and could compromise adhesion and the integrity of the fireproofing system.

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