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A firestop or fire-stopping is a form of passive fire protection that is used to seal around openings and between joints in a fire-resistance-rated wall or floor assembly. Firestops are designed to maintain the fireproofing of a wall or floor assembly allowing it to impede the spread of fire and smoke.

Firestops prevent unprotected horizontal and vertical penetrations in a fire-resistance-rated wall or floor assembly from creating a route by which fire and smoke can spread that would otherwise have been fire-resisting construction, e.g. where a pipe passes through a firewall.

Fire stopping is also to seal around gaps between fire resisting constructions, e.g. the linear gap between a wall and the floor above, in order for construction to form a complete barrier to fire and smoke spread.

Firestops are used in:

• Electrical, mechanical, and structural penetrations
• Unpenetrated openings (such as openings for future use)
• Re-entries of existing firestops
• Control or sway joints in fire-resistance-rated wall or floor assemblies
• Junctions between fire-resistance-rated wall or floor assemblies
• Head-of-wall (HOW) joints, where non-load-bearing wall assemblies meet floor assemblies

courtesy : wikipedia