When sealing a penetration in a fire-rated wall using a specific caulk, which alternative could complete the seal if the specified product is unavailable?

When sealing a penetration in a fire-rated wall using a specific caulk, which alternative could complete the seal if the specified product is unavailable?

• A. Hilti CP 601S Elastomeric Firestop Sealant
• B. 3M CP25WB+ Fire Barrier Caulk
• C. Either Hilti or 3M
• D. Neither Hilti nor 3M

Answer: (B)

The key idea is that firestop work relies on listed, tested products for a specific wall assembly and penetration details. If the exact product isn’t available, you may substitute only with another product that is listed as an equivalent for that same assembly and provides the same fire-resistance rating. In this scenario, the 3M CP25WB+ Fire Barrier Caulk is an approved substitute for the specified system, so it can complete the seal and maintain the required fire rating. The Hilti option isn’t guaranteed to be an equivalent for this exact assembly, so it isn’t considered an acceptable substitute here. Substituting with either brand as a blanket rule isn’t appropriate because substitutions must be explicitly listed as equivalent for the particular penetration and rating. And there is a valid listed substitute, so choosing “neither” wouldn’t be correct.

The key idea is that firestop work relies on listed, tested products for a specific wall assembly and penetration details. If the exact product isn’t available, you may substitute only with another product that is listed as an equivalent for that same assembly and provides the same fire-resistance rating.

In this scenario, the 3M CP25WB+ Fire Barrier Caulk is an approved substitute for the specified system, so it can complete the seal and maintain the required fire rating. The Hilti option isn’t guaranteed to be an equivalent for this exact assembly, so it isn’t considered an acceptable substitute here. Substituting with either brand as a blanket rule isn’t appropriate because substitutions must be explicitly listed as equivalent for the particular penetration and rating. And there is a valid listed substitute, so choosing “neither” wouldn’t be correct.