Fire stopping seals gaps around service penetrations through fire-rated walls and floors. Cavity barriers prevent fire and smoke spreading through concealed voids in walls, ceilings, and roofs. Both are critical elements of a building's passive fire protection system. Incorrect installation, missing fire stops, or the use of non-approved materials compromises the fire compartmentation that protects occupants during a fire. Every fire stop must be installed by trained operatives using third-party certified products to the manufacturer's tested details.
Key Hazards
Fire spreading through unsealed service penetrations in fire-rated elements
Smoke and flame travelling through unprotected cavities and concealed voids
Non-certified materials used as substitutes failing to achieve the required fire rating
Incomplete installation leaving gaps that compromise the entire compartmentation system
Control Measures
Install fire stopping using only third-party certified products tested for the specific penetration type.
Follow the manufacturer's tested installation detail exactly for every fire stop configuration.
Ensure all cavity barriers are correctly positioned and secured at the locations shown on the design drawings.
Photograph every fire stop installation before it is concealed for the project fire safety records.
Train all fire stopping installers in the products, installation methods, and certification requirements.
Inspect completed fire stopping before sign-off and reject any installation that does not match the tested detail.
Coordinate with mechanical and electrical trades to ensure all penetrations are fire stopped after installation.
Maintain a fire stopping register recording the location, product, installer, and inspection status of every seal.
Never substitute fire stopping products without obtaining formal approval from the fire engineer.
Remember
Fire stopping is a life safety system — incorrect installation puts building occupants at direct risk.
Only third-party certified products installed to the exact tested detail provide the required fire rating.
Every fire stop must be photographed before concealment for the building's fire safety file.
Substituting non-approved materials is extremely dangerous and may constitute a criminal offence.
Cavity barriers must be complete and continuous to prevent fire travelling through concealed voids.
Missing fire stops around even a single pipe penetration can allow fire to bypass the compartment wall.
Applicable Legislation: Regulatory Reform (Fire Safety) Order 2005 · Building Regulations Part B (Fire Safety) · BS 476 (Fire Tests) · CDM Regulations 2015