page_title: Firestop
section_title: Spray fireproofing
hierarchical_section_title: Firestop / Maintenance / Spray fireproofing
caption_attribution_description: Improper Firestop and Fireproofing interface, August 2000, Cambrian College, Greater Sudbury, Ontario, Canada.
context_page_description: 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.
context_section_description: Spray fireproofing of structural steel is best accomplished before interior partitions are built. Otherwise, a conflict with firestops in firewalls could result. Firestops must adhere to the bare, dry, unobstructed surfaces of the fire barrier which is penetrated (metal decking, for example), or adjacent to an interface of two fire barriers at which fire stopping is required (such as beams). Spray fireproofing cannot be applied before firestopping on these surfaces, since the fireproofing would obstruct adherence of the firestop materials to the fire-barrier surfaces. Spraying the upper room perimeter with fireproofing may also cover wall or ceiling joints and through penetrations which require firestopping. These joints are then not provided with proper firestopping, violating the integrity of the passive fire barrier.
caption: Improper firestopping
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