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Reference.org
Firestop
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<p>A firestop or fire-stopping is a form of <a href="/facts/Passive_fire_protection/D0WVYQzU">passive fire protection</a> that is used to seal around <a href="/facts/Penetration_(firestop)/MTTjDlmQ">openings</a> and between <a href="/facts/Joint_(building)/ej042dN8">joints</a> in a <a href="/facts/Fire-resistance_rating/JRm45fk8">fire-resistance-rated</a> wall or floor assembly. Firestops are designed to maintain the fire-resistance rating of a wall or floor assembly intended to impede the spread of fire and smoke. </p>