B2 Commercial Building Inspector Practice Test

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A contractor substitutes a different gypsum panel thickness in a listed fire-resistance-rated wall assembly. What should the inspector require?

Acceptance if the total wall thickness is unchanged Verification that the substitution is permitted by the approved listed assembly or an approved alternate Acceptance if the panel has the same color paper facing Only a note in the daily inspection log

Correct Answer:

Verification that the substitution is permitted by the approved listed assembly or an approved alternate

Explanation:

Fire-resistance ratings depend on the tested or listed assembly. Changing a component such as gypsum thickness is acceptable only when the approved system or an approved alternative specifically permits it.

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