If there are 100 columns on a floor that receive SFRM, how many must be thickness tested?

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Multiple Choice

If there are 100 columns on a floor that receive SFRM, how many must be thickness tested?

Sampling for thickness control in sprayed fireproofing is about verifying that the installed SFRM meets the required thickness without testing every column. For a floor with 100 columns, testing a quarter of them—25 columns—provides a representative check of workmanship and material performance across the floor. This level of testing balances confidence that the average thickness is within spec with practical limits on labor and time. If the 25 tests show the thickness is within tolerance, you can reasonably expect the rest to be compliant; if issues arise, you know where to focus additional testing or remediation.

Sampling for thickness control in sprayed fireproofing is about verifying that the installed SFRM meets the required thickness without testing every column. For a floor with 100 columns, testing a quarter of them—25 columns—provides a representative check of workmanship and material performance across the floor. This level of testing balances confidence that the average thickness is within spec with practical limits on labor and time. If the 25 tests show the thickness is within tolerance, you can reasonably expect the rest to be compliant; if issues arise, you know where to focus additional testing or remediation.

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