What Is Passive Fire Protection and Why Is It Important?
What Is Passive Fire Protection and Why Is It Important?
Fire safety within a building isn’t only about alarms, extinguishers and sprinkler systems. Some of the most important fire protection measures are built directly into the structure of the building and are designed to work without anyone having to activate them.
This is known as passive fire protection.
Passive fire protection helps restrict the spread of fire and smoke, maintain fire compartmentation and protect structural elements for a specified period. When correctly designed, installed and maintained, these measures form an essential part of a building’s overall fire safety strategy.
In this guide, we’ll explain what passive fire protection is, how it works and some of the different systems used to protect buildings and their occupants.
IN THIS GUIDE
- What is passive fire protection
- How does passive fire protection work?
- Active vs passive fire protection
- The main types of passive fire protection
- Why is passive fire protection important?
- What can compromise passive fire protection?
- Inspections and maintenance
- When should you speak to a specialist?
What Is Passive Fire Protection?
Passive fire protection, often shortened to PFP, refers to fire-resistant systems and elements incorporated into the fabric and structure of a building to help restrict the spread of fire and smoke and maintain the building’s fire-resisting construction.
Unlike an alarm that needs to detect a fire or a sprinkler system that activates in response to heat, many passive fire protection measures perform their function through their construction and installation.
A simple example is a fire-resistant wall separating two areas of a building. The wall forms part of a fire-resisting boundary. However, if pipes, cables or other services pass through that wall, the openings created can compromise its performance unless suitable tested fire stopping systems are installed around those penetrations.
Passive fire protection therefore isn’t one individual product. It involves different systems and construction methods working together as part of the building’s overall fire strategy.
How Does Passive Fire Protection Work?
One of the key principles behind passive fire protection is fire compartmentation.
Compartmentation involves dividing a building into fire-resisting areas using elements such as walls and floors. The purpose is to restrict the movement of fire and smoke from one part of the building to another for the required period.
For compartmentation to remain effective, the complete fire-resisting construction needs to perform as intended.
This becomes particularly important where building services pass through compartment walls and floors. Pipes, electrical cables, cable trays, ducts and other services can create openings through otherwise fire-resistant construction.
Those penetrations need appropriate fire stopping systems capable of maintaining the required fire performance.
Passive fire protection can also be used to protect structural elements. Structural steel, for example, can lose strength as its temperature increases during a fire. Systems such as intumescent coatings and fire-resistant board encasements can help protect steelwork for the required period.
The principle throughout is the same: slow the spread of fire and smoke, maintain compartmentation and protect the building’s structure for the required period.
What Is the Difference Between Active and Passive Fire Protection?
Active and passive fire protection perform different roles, but both can form part of an effective fire safety strategy.
Active Fire Protection
Active fire protection generally involves systems that respond to a fire or require some form of activation.
Examples can include:
- Fire detection and alarm systems
- Sprinklers and other suppression systems
- Fire extinguishers
- Other firefighting equipment
Passive Fire Protection
Passive fire protection is primarily incorporated into the building itself.
Examples can include:
- Fire-resistant walls and partitions
- Fire stopping
- Fire curtains and barriers
- Structural steel protection
- Fire-resistant ceilings and floors
Put simply, active systems can detect, warn of or respond to a fire, while passive systems are designed to resist and contain its spread.
The two shouldn’t be viewed as alternatives. They perform different functions within an overall approach to fire safety. This distinction is also reflected in UK fire-service guidance.
What Are the Main Types of Passive Fire Protection?
There are many forms of passive fire protection, with the appropriate systems depending on the building, construction, fire strategy and individual application.
At Bee Fire Protection, our core passive fire protection services include:
Fire Stopping
Fire stopping is used to reinstate the fire resistance of walls, floors and other fire-resisting construction where openings, joints and service penetrations would otherwise compromise the compartment.
Pipes, cables, ducts and other services passing through fire-resistant construction can create a route through which fire and smoke may spread.
Appropriate tested fire stopping systems are installed around these penetrations to help maintain the required fire resistance of the construction.
Fire Curtains
Fire curtains and barriers provide a specialist means of restricting the spread of fire and smoke where conventional fire-resistant construction may not be appropriate for the particular application.
When correctly specified and installed, fire curtain systems can form an important part of a building’s fire compartmentation strategy.
Bee Fire Protection installs specialist fire curtain systems in accordance with manufacturers’ tested systems and approved installation requirements.
Structural Steel Protection
Steel is widely used within building structures because of its strength, but exposure to high temperatures during a fire can significantly affect its structural performance.
Passive fire protection can be applied to structural steel to help limit the rate at which its temperature increases.
One method is fire-resistant board encasement, where specialist boards are installed around steel beams and columns to create a protective enclosure.
Intumescent Coatings
Intumescent coatings provide another method of protecting structural steel.
These reactive coatings expand when subjected to high temperatures, forming an insulating char around the steel. This helps reduce the rate at which the steel heats during a fire.
The required system and coating thickness depend on factors including the steel section, section factor and required fire-resistance period.
Fire Walls, Partitions & Ceilings
Fire-resistant walls, partitions and ceiling systems can be used to create and maintain fire-resisting construction within a building.
These systems help divide buildings into compartments and restrict the spread of fire and smoke between different areas.
Bee Fire Protection installs fire walls, fire integrity partition walls and fire-rated ceiling systems in accordance with manufacturers’ tested systems and approved installation details.
Why Is Passive Fire Protection Important?
Passive fire protection can be easy to overlook because much of it isn’t immediately visible during the normal use of a building.
But its role becomes critical in the event of a fire.
Restricting the Spread of Fire and Smoke
Effective compartmentation is intended to restrict the movement of fire and smoke between different areas of a building rather than allowing unrestricted spread.
Supporting Safe Evacuation
By helping restrict fire and smoke to particular areas, passive fire protection supports the building’s wider evacuation strategy and helps protect escape routes for the period intended by the fire strategy.
Protecting Structural Integrity
Structural fire protection can help structural elements such as steel columns and beams maintain their required performance when exposed to fire.
Supporting Fire Safety Compliance
Passive fire protection measures form part of the fire-safety provisions considered within UK building and fire-safety requirements. The exact requirements depend on factors such as the building, its use, design and applicable regulations and guidance. Further information on fire safety requirements for building work can be found in the Government’s Approved Document B: Fire Safety.
Limiting Fire Spread and Damage
Containing a fire can also help limit its spread into additional areas of a building, potentially reducing the extent of damage and disruption.
What Can Compromise Passive Fire Protection?
A passive fire protection system can be correctly installed when a building is constructed and subsequently become compromised.
Common causes can include:
New service penetrations – New cables, pipes or other services may be installed through existing compartment walls or floors without the penetration being appropriately fire stopped.
Building alterations – Refurbishment, fit-out works and changes to layouts can affect existing fire-resisting construction.
Damage – Passive fire protection systems can become damaged during other construction or maintenance work.
Incorrect installation – Products used outside their tested application or systems installed incorrectly may not provide the intended performance.
Incompatible materials – Passive fire protection is about complete tested systems rather than simply filling an opening with a material that appears fire resistant.
Poorly documented changes – Changes made over the lifetime of a building can make it difficult to understand what has been altered and whether the original fire compartmentation remains intact.
This is one reason why passive fire protection shouldn’t simply be considered at the construction stage and then forgotten.
Why Tested Systems and Correct Installation Matter
Passive fire protection is not simply about choosing a product labelled as fire resistant.
The performance of a passive fire protection system depends upon factors including the substrate, opening size, penetrating services, supporting construction, installation method and the particular tested system being used.
A solution suitable for one penetration or construction type cannot automatically be assumed to be appropriate for another.
At Bee Fire Protection, installations are carried out in accordance with manufacturers’ tested systems and approved installation details.
This approach helps ensure that the installed solution corresponds with appropriate test evidence rather than relying on assumptions or improvised details.
Why Passive Fire Protection Inspections Matter
Even correctly installed passive fire protection can be affected by changes to a building over time.
An inspection or audit can help identify issues such as:
- Missing or damaged fire stopping
- Unsealed service penetrations
- Unsuitable previous installations
- Damage to compartment walls or systems
- Alterations that may have compromised existing protection
- Areas requiring further investigation or remedial work
For building owners, facilities managers and organisations responsible for complex properties, periodic inspection can provide a clearer picture of the condition of existing passive fire protection.
Learn more about our Inspections & Audits >>
Passive Fire Protection Doesn’t End After Installation
Buildings change.
New data cables are installed. Pipework is altered. Mechanical and electrical systems are upgraded. Rooms are refurbished and layouts change.
Every alteration that interacts with fire-resisting construction has the potential to affect the passive fire protection measures already in place.
That’s why ongoing management and maintenance are important.
Where defects or new penetrations are identified, appropriate remedial work can help restore the required fire performance and maintain the intended compartmentation.
Bee Fire Protection provides ongoing fire safety maintenance alongside its installation and inspection services.
Who Needs to Think About Passive Fire Protection?
Passive fire protection can be relevant to virtually every type of building, but the requirements and responsibilities will differ depending on the property and circumstances.
Bee Fire Protection works with clients including:
Main contractors requiring specialist passive fire protection during construction.
Facilities managers responsible for maintaining fire safety measures within existing buildings.
Property owners and managers requiring inspections, remedial works or ongoing maintenance.
Modular building manufacturers requiring passive fire protection incorporated into specialist construction systems.
Our experience spans sectors including commercial and industrial buildings, construction, education, healthcare and care environments, high-rise and residential projects, infrastructure, modular construction and other regulated environments.
When Should You Speak to a Passive Fire Protection Specialist?
Specialist input may be appropriate at several stages of a building’s lifecycle.
This can include:
- During the design or construction of a new building
- When passive fire protection works form part of a construction package
- During refurbishment or fit-out works
- When new services penetrate existing fire compartments
- Following the identification of passive fire protection defects
- When existing installations require inspection
- When remedial passive fire protection work is required
- As part of an ongoing maintenance programme
Getting specialist advice early can help identify the appropriate tested solution before work progresses and potentially avoid unsuitable installations having to be rectified later.
Frequently Asked Questions About Passive Fire Protection
What does passive fire protection mean?
Passive fire protection refers to fire-resistant systems and elements incorporated into a building to help restrict the spread of fire and smoke, maintain compartmentation and protect structural elements for a required period.
What are examples of passive fire protection?
Examples include fire stopping, fire-resistant walls and partitions, fire curtains and barriers, structural steel protection, intumescent coatings and fire-resistant ceilings and floors.
Is fire stopping passive fire protection?
Yes. Fire stopping is an important part of passive fire protection. It is used to seal penetrations, openings and gaps in fire-resisting construction to help maintain the required fire resistance.
What's the difference between active and passive fire protection?
Active systems generally detect, warn of or respond to a fire, such as fire alarms and suppression systems. Passive fire protection is primarily incorporated into the building and designed to resist or restrict the spread of fire and smoke.
Does passive fire protection need maintenance?
Passive fire protection can become damaged or compromised as buildings are altered and maintained. Inspection and appropriate maintenance can therefore be important in ensuring existing systems continue to perform as intended.
Does Bee Fire Protection work nationwide?
Yes. Bee Fire Protection is based in Hull and delivers specialist passive fire protection services for projects across the UK.
Need Help With Passive Fire Protection?
Bee Fire Protection provides specialist passive fire protection services for projects throughout the UK.
From fire stopping and fire curtains to structural steel protection, intumescent coatings, fire-resistant walls and partitions, inspections and ongoing maintenance, our experienced team can support new construction, refurbishment, remedial works and existing buildings.
If you have a project or need advice about existing passive fire protection, speak to our team to discuss your requirements.