A firestopping material that expands when heated is referred to as ?.

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Study for the Fire Alarm Lesson 5and6 Test. Prepare with flashcards and multiple choice questions; each question comes with hints and explanations. Gear up for success on your exam!

Multiple Choice

A firestopping material that expands when heated is referred to as ?.

Explanation:
Intumescent describes a firestop material that expands when heated. In a fire, it swells to fill the gap around openings, creating an insulating layer and a solid seal that slows heat transfer and stops flames and smoke from passing through. This behavior keeps the fire-resistance rating of walls and floors intact. Insulating materials mainly provide thermal resistance without swelling to fill gaps; elastomeric materials are flexible sealants that don’t rely on expansion to seal under high heat; cementitious products are rigid and don’t expand to accommodate the kind of gap growth that occurs in a fire. So the material that expands when heated is intumescent.

Intumescent describes a firestop material that expands when heated. In a fire, it swells to fill the gap around openings, creating an insulating layer and a solid seal that slows heat transfer and stops flames and smoke from passing through. This behavior keeps the fire-resistance rating of walls and floors intact. Insulating materials mainly provide thermal resistance without swelling to fill gaps; elastomeric materials are flexible sealants that don’t rely on expansion to seal under high heat; cementitious products are rigid and don’t expand to accommodate the kind of gap growth that occurs in a fire. So the material that expands when heated is intumescent.

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