A joist is tested for SFRM thickness. How many of the thickness measurements can be less than the specified thickness?

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Multiple Choice

A joist is tested for SFRM thickness. How many of the thickness measurements can be less than the specified thickness?

When you test SFRM thickness, there’s a tolerance for variation along the joist. The acceptance rule is that at most one measurement can be less than the specified thickness; all other measurements must meet or exceed it. This accounts for normal spray variability and substrate quirks while ensuring the overall fire-resistance protection is sufficient. So, you can have one spot under the thickness, but two or more measurements below would indicate an under-application and fail the test.

When you test SFRM thickness, there’s a tolerance for variation along the joist. The acceptance rule is that at most one measurement can be less than the specified thickness; all other measurements must meet or exceed it. This accounts for normal spray variability and substrate quirks while ensuring the overall fire-resistance protection is sufficient. So, you can have one spot under the thickness, but two or more measurements below would indicate an under-application and fail the test.

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