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Fire Stopping: How Does It Work?

Fire stopping, also called compartmentation, is an essential component of active and passive fireproofing. It is the technique of sealing holes and seams between floors and walls using fire-resistant materials to prevent fire from spreading throughout compartments inside a structure. Continue reading as this article will examine fire-stopping techniques and their applications in active and passive fire defence.

What Is Fire Stopping?

The best definition of fire stopping is to seal all holes to prevent fire, such as heat and smoke, from moving across complex building parts. This aims to confine fire by constructing fire-resistant compartments that separate the structure horizontally or vertically. In addition, structures should guarantee that apertures and holes are fire-stopped to limit vertical and lateral burning.

How Does Fire Stopping Work?

The compartmentalisation idea underpins the Fire Stopping concept. Building compartments will keep the fire contained to the region where it began. The primary compartment buildings, including the ceiling components, walls, and floors, are fire-resistant for a set period. 

Furthermore, as structures are outfitted with gas, air, water, internet connectivity, and electricity, multiple service openings pass through them. Joints are also required for the capabilities of compartments. If the fire is not extinguished, smoke, heat, and flames will be scattered over any entrance in the compartment. 

What Are The Fire Stopping Methods And Products?

There are several firefighting techniques, materials, and equipment available. These could change based on the building’s needs and surroundings. The following are some frequent procedures and goods, as well as when they are commonly utilised.

Fire Sleeves: Cables And Pipes

Cables and pipes may go through several compartments inside a structure. The apertures surrounding their entrance and departure points among compartments may operate as fire propagation pathways. Passive fireproofing specialists have several measures at their disposal to avoid this.

Moreover, fire sleeves are barriers designed to fill gaps left by wires and pipes running into ceilings or walls. These sleeves swiftly stretch whenever a fire breaks out to close the area between the wires or pipes and the surrounding objects. When utilised with plastic piping systems, the sleeve crushes the pipe to guarantee that the gap is completely shut and no fire and smoke may move to the next region.

Fire Collars: Penetrations And Pipes 

Fire collars, like fire sleeves, broaden when exposed to high temperatures from a fire. These collars, in combination with other fire breaks, assist in maintaining fire levels of resistance and hinder flames or gases from disseminating from one area to another.

Fire Covers: Ceilings

These coverings are intended to prevent ceiling fires. In the event of a fire, the covering will quickly expand within, filling the whole area with a fire-resistant insulation char.

Gap Fillers And Fire Sealants: Gaps, Windows, Door Frames

Gap fillers and fire sealants prohibit smoke from expanding throughout gaps and fire windows. Moreover, there are many fillers and adhesives available, and it is vital to choose the one that is most suitable for the application and base.

Passive Fire Protection Measures Fire Ratings

The Building Code requires an independent fire-tested FRL (Fire Resistance Level) for passive fire protection systems. An FRL is assigned to an entire component or system that has passed the Standard Fire Resistance Test. Furthermore, the fire resistance standards differ based on the kind of system.

Structural Sufficiency

This fire resistance criterion is only applicable to load-bearing equipment. The element can stay in place if subjected to fire testing at design or operating stress circumstances. This is described as the passive fire prevention system’s capacity to withstand the movement of hot and fire gases.


This refers to a passive fire prevention system’s capacity to restrict the temperature increase from the firepit of a wall to the non-fireside of the barrier. Because the fire boundary or fire-stopping materials may become hot on the non-fire end, the fire barriers’ selection and design are critical. Moreover, they vary based on the fire rating duration.

Fire Resistance In The Early Stages (RISF)

This rule applies to any fire-rated ceiling or floor system. The RISF restricts the temperatures within the ceiling or floor chamber to specified limits and periods, particularly in areas where services flow through the ceiling or floor system.

Protection Of Active Fire Service Pipe Openings

Because an active fire service pipe goes in via a fire barrier, the FRL of the protective layer must be ensured using a fire-tested system with the required FRL or fire rating.

However, it becomes entirely overly complex and is frequently misinterpreted. When you consider the fire dynamics and physics at work here, it’s pretty easy.

1. Check that the pipe is adequately supported on both sides of the aperture.

2. Fill the gap in the fire barrier to prevent hot and flame gases from passing through.

3. Guarantee that heat conduction throughout the steel or copper pipe on the non-fire side is maintained cold enough to prevent combustibles from igniting and spreading fire over the barrier.


Fire suppression is a critical part of building protection. They are essential to assist in avoiding the spread of fire across the various structure compartments. Without adequately constructed fire stops, flames and smoke may swiftly move across a structure, harming the assets and endangering the lives of its residents. Fire stops also assist emergency personnel in putting out fires before they get out of hand.

Furthermore, firefighting techniques must be checked and evaluated for efficacy once built. Inability to do so may result in your property failing to meet current fire safety rules, and you may be made responsible in the case of a fire.

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