Fire Stopping

Fire stopping is the collective term for passive fire protection measures — materials, systems, and techniques — used to prevent the spread of fire and smoke through openings, penetrations, and cavities in fire-rated walls, floors, and partitions. Building regulations require that structures be divided into fire compartments that contain a fire for a defined period, limiting its spread and allowing occupants time to evacuate. Every pipe, duct, cable, and junction that passes through a compartment boundary is a potential path for fire and smoke to bypass the compartment boundary — fire stopping closes those paths.

Fire stopping is one of the most commonly deficient elements identified in building safety inspections. The Grenfell Tower inquiry and subsequent investigation of fire safety deficiencies across the UK residential building stock revealed widespread failures in fire stopping installation, including missing fire stopping, incorrect materials, inadequate coverage of penetrations, and failure to maintain stopping after subsequent works.

Common fire stopping systems include intumescent materials (which expand significantly when heated, closing off a penetration when the pipe or cable within it melts or burns), ablative materials (which char to form a seal), mineral fibre collars, and purpose-made fire stopping pillows. Each system is appropriate for specific penetration types and fire resistance requirements, and installation in accordance with the manufacturer's specification is critical to performance.

For building surveyors and fire safety consultants, fire stopping surveys involve systematic inspection of all service penetrations through fire compartment boundaries — ceilings, walls, and floors throughout the building. This is intrinsically spatial work: each penetration must be located on a plan, its fire stopping system identified and assessed, and any deficiencies recorded for remediation.

360° panoramic documentation in fire stopping surveys provides the same spatial benefits as in structural condition surveys: each photographed penetration is pinned to its location on the floor plan, creating an immediately navigable record that building managers, contractors, and fire safety inspectors can use to locate, assess, and verify the remediation of individual items.