A wide flange column is required to have 2 inches of SFRM thickness. What is the lowest allowable individual thickness measurement?

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Multiple Choice

A wide flange column is required to have 2 inches of SFRM thickness. What is the lowest allowable individual thickness measurement?

Spray-applied fireproofing is specified by a nominal thickness, but a small downward tolerance is allowed at individual measurement points while still meeting the required rating overall. If the required thickness is two inches, the allowable downward tolerance on a single spot is typically a quarter inch. That means the lowest acceptable measurement at any single point is 2 inches minus 1/4 inch, which is 1-3/4 inches. Readings thinner than that would pull down the overall average below the required thickness, while readings at or above the nominal (or thicker) can still satisfy the specification when averaged across the area.

Spray-applied fireproofing is specified by a nominal thickness, but a small downward tolerance is allowed at individual measurement points while still meeting the required rating overall. If the required thickness is two inches, the allowable downward tolerance on a single spot is typically a quarter inch. That means the lowest acceptable measurement at any single point is 2 inches minus 1/4 inch, which is 1-3/4 inches. Readings thinner than that would pull down the overall average below the required thickness, while readings at or above the nominal (or thicker) can still satisfy the specification when averaged across the area.

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