Fire Barriers

A fire barrier is a type of passive fire protection designed to resist the spread of fire and smoke between different areas of a building. Fire barriers are constructed using materials that can withstand high temperatures and prevent fire from penetrating through walls, floors, and ceilings. They help to compartmentalise a building, slowing down the movement of fire and smoke, which can protect occupants and allow for safer evacuation.

A cavity fire barrier is specifically designed to seal gaps within cavities in walls, floors, or ceilings. These barriers are installed within the voids or cavities of a building’s structure to prevent the spread of fire and smoke through these often overlooked spaces. They are essential in maintaining the integrity of fire-rated compartments by filling gaps and openings, thus enhancing the overall fire protection of the building.

Fire barriers are required in various locations within a building to ensure effective fire safety. Common areas where fire barriers are installed include:

• Between different fire compartments to prevent the spread of fire and smoke.
• In stairwells and elevator shafts to protect vertical shafts from fire spread.
• Around service penetrations such as pipes and cables that pass through fire-rated walls and floors.
• In large open spaces to divide the area into smaller, manageable sections.
• In buildings with multiple use areas to separate different functional zones with varying fire risks.

Vertical Cavity Barriers are installed within wall cavities to prevent the vertical spread of fire and smoke between floors. They create a barrier that stops fire from travelling up through the cavities of a building.

Horizontal Cavity Barriers are placed in horizontal spaces, such as between floors or ceilings, to prevent the horizontal spread of fire and smoke. They ensure that fire does not spread across the building through these horizontal voids.

Both types are crucial for maintaining fire compartmentation and protecting the structural integrity of a building during a fire.

Vertical cavity barriers are required in specific locations within buildings to enhance fire safety and compartmentalisation. They are generally installed:

Between Floors: To prevent the vertical spread of fire and smoke through wall cavities between different floors of a building.

Around Shafts and Risers: Such as these contain stairwells, lift shafts, or service ducts, to block fire and smoke from travelling vertically through these service penetrations.

Within Wall Voids: To stop the fire from spreading up through the cavities within walls, especially in high-rise and multi-story buildings.

In Building Façades: To limit fire spread between different parts of a building's façade, particularly in buildings with external cavity walls.

At Wall Junctions: Where walls intersect or meet, to ensure that fire and smoke are contained within each compartment and do not travel through the cavities.

These barriers help to maintain fire compartmentation, protect escape routes, and enhance overall building safety.

A fire barrier wall is a type of wall designed to resist the passage of fire and smoke for a specified period. It is built using materials that have been tested and rated to withstand fire exposure and prevent its spread. Fire barrier walls are crucial in maintaining the structural integrity of fire compartments and ensuring that fire does not travel between different areas of a building, thereby enhancing overall safety.

In the UK, the regulation that covers fire barriers within trunking is outlined in the Building Regulations 2010 (Part B). Specifically, it addresses the requirements for fire stopping and compartmentation in areas where services, such as electrical or plumbing trunking, pass through fire-resistance-rated barriers. This regulation ensures that fire barriers around trunking maintain their fire resistance, preventing the spread of fire through these service openings. Compliance with these regulations is critical for maintaining fire safety standards within a building.