How do penetrations or fixtures affect fireproofing thickness requirements?

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Multiple Choice

How do penetrations or fixtures affect fireproofing thickness requirements?

Penetrations and fixtures disrupt the continuous layer of fireproofing, so the protection around those features isn’t the full rated thickness. The opening or fixture creates a spot where the material is thinner, which reduces the local fire resistance. To maintain the required rating, that deficit must be corrected with patching or repairs to bring the thickness back up to the specified value around the penetration. Local increases aren’t accurate because the disruption typically reduces protection, not enhances it; there’s usually a need to restore rather than remove or leave it unchanged.

Penetrations and fixtures disrupt the continuous layer of fireproofing, so the protection around those features isn’t the full rated thickness. The opening or fixture creates a spot where the material is thinner, which reduces the local fire resistance. To maintain the required rating, that deficit must be corrected with patching or repairs to bring the thickness back up to the specified value around the penetration. Local increases aren’t accurate because the disruption typically reduces protection, not enhances it; there’s usually a need to restore rather than remove or leave it unchanged.

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