Fire Cavity Barriers & Firestopping Guide

Fire cavity barriers and firestopping are two essential elements of passive fire protection. This guide explains what each involves, where they may be required, and who is responsible for ensuring they are properly installed and maintained.

What Is Passive Fire Protection?

Passive fire protection refers to measures built into a building's construction that limit the spread of fire and smoke without requiring active intervention. Unlike fire alarm systems or sprinkler systems, passive fire protection works continuously and automatically: it is part of the building's construction itself.

In commercial buildings, fire compartmentation helps contain fire and smoke and allows people to evacuate safely and in a timely manner. Fire cavity barriers and firestopping are two of the most important passive fire protection measures that help maintain this compartmentation.

What Are Fire Cavity Barriers?

Fire cavity barriers are fire-resistant materials installed within concealed spaces, such as wall cavities, to prevent the spread of fire and smoke. These cavities, often found within exterior and interior walls, can act as pathways for flames and hot gases, allowing fire to spread rapidly between different parts of a building. By closing off these spaces, cavity barriers help contain fire within a specific area and reduce the risk of fire spreading unseen.

They are a key element of passive fire protection and are typically installed during the construction phase of a building.

Important Distinction

Cavity barriers should not be confused with cavity closers. While both are used to close off cavities, cavity closers are primarily designed to prevent moisture and air infiltration and are not intended to provide fire resistance.

Where Are Cavity Barriers Required?

Requirements for fire compartmentation and limiting the spread of fire and smoke vary depending on the building type, construction, occupancy, and applicable jurisdiction. In the United States, fire protection requirements are generally based on adopted building and fire codes, such as the International Building Code (IBC) and applicable local and state requirements.

Cavity barriers may be required in certain concealed spaces and building assemblies to limit the spread of fire and smoke. The specific requirements depend on factors such as the construction type, occupancy, and design of the building.

In existing buildings, particularly older properties, cavity barriers may be missing, damaged, or no longer meet applicable requirements. Their presence and condition should therefore be assessed as part of a professional fire risk assessment.

How Do Cavity Barriers Work?

Many cavity barriers are made from materials that expand when exposed to heat, effectively sealing gaps and preventing flames and smoke from passing through. By limiting the spread of fire and smoke within a building, they help contain fire to its point of origin and improve the effectiveness of other fire safety measures.

What Is Firestopping?

Firestopping is the process of sealing openings, gaps, and penetrations through which fire and smoke could spread. It forms part of your passive fire protection plan and is essential for maintaining the integrity of fire compartmentation throughout your building.

Whether your building was renovated before you moved in or work has been carried out as part of a refurbishment, these activities can compromise your passive fire protection measures. Fire and smoke can spread quickly between building compartments if gaps and penetrations are not properly sealed.

What Does Firestopping Involve?

During firestopping inspections, specialists can identify areas that may be vulnerable to the spread of fire. Common areas that may require firestopping include:

1 Joints or gaps between walls and floors

2 Openings around pipes, cables, and beams

3 New penetrations created during construction work

4 Openings left after components have been removed

Using a variety of materials, these gaps, openings, and often overlooked areas can be sealed to restore the fire compartmentation of your building.

Penetrations through fire-resistance-rated walls and floors must be properly protected so that the required fire-resistance rating of the assembly is maintained. Depending on the application, this may involve listed firestop systems or other approved fire protection measures.

Who Is Responsible for Firestopping?

As the owner or manager of your property, it is essential to ensure that your building has appropriate fire protection measures in place. After renovation or construction work, you should verify that fire compartmentation and passive fire protection measures have been properly maintained or restored.

Responsibility

Maintaining firestopping and passive fire protection requires particular attention after construction or renovation work. If work has been carried out on your premises, it is important to ensure that the fire protection measures have been properly restored.

Fire Cavity Barriers and Firestopping: What Is the Difference?

Fire cavity barriers and firestopping are often confused, but they address different aspects of passive fire protection:

Cavity Barriers

Cavity barriers are installed within concealed spaces and cavities to restrict the spread of fire through hidden spaces within the building structure.

Firestopping

Firestopping seals specific penetrations, gaps, and openings in fire-resistance-rated walls and floors, typically created by pipes, cables, beams, or construction work.

Both are essential to maintaining fire compartmentation, but they address different fire spread risks. A building may require both, and neither should be overlooked following construction or renovation work.

Firestopping and Cavity Barrier Services from Scutum

Whether you need a firestopping inspection or a comprehensive risk assessment for your building, Scutum has extensive experience in fire protection. If your building requires firestopping services, our teams can come to your site to carry out the necessary work, giving you greater peace of mind.

For businesses and property owners, ensuring that cavity barriers are properly installed and maintained is essential for compliance, safety, and protecting both people and property.

Arrange a Firestopping Inspection

Contact Scutum today to learn more about firestopping for your building or to arrange a comprehensive risk assessment for your property, where we will review your passive fire protection measures.

Get in touch with Scutum to schedule a firestopping inspection or fire risk assessment.

Fire Cavity Barriers and Firestopping: A Guide for U.S. Businesses