Plumber Red Seal · Question
When a plastic pipe penetrates a fire-rated wall assembly, what is a primary requirement for the firestopping system used?
Because plastic pipe will melt and fall away in a fire, an intumescent firestop is required. This type of sealant expands rapidly when exposed to heat, sealing
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Question: When a plastic pipe penetrates a fire-rated wall assembly, what is a primary requirement for the firestopping system used?
Answer options:
- It must be a flexible sealant to allow for pipe movement. ✅ It must be an intumescent type that expands when heated.
- It can be packed tightly with mineral wool insulation.
- It must include a metal sleeve for all penetrations.
Correct answer: It must be an intumescent type that expands when heated.
Explanation: Because plastic pipe will melt and fall away in a fire, an intumescent firestop is required. This type of sealant expands rapidly when exposed to heat, sealing the void left by the melted pipe to maintain the wall's fire rating.
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