Fire doors are a critical part of passive fire protection in buildings. They are designed to contain fire and smoke, protect escape routes, and slow the spread of flames, but not all fire doors are made the same.
The materials used can directly affect their fire resistance rating, durability and suitability for different environments, so it is important to understand each one. With that in mind, Fire Door Specialists provide a detailed breakdown into what fire doors are, the most common materials that are used, how they perform, and how to choose the right option for your business.
What is a fire door?
It might appear to be an obvious answer, but you’ll be surprised to learn there’s more to it than meets the eye. A fire door is a specially constructed door assembly designed to resist fire and smoke for a specified period. Fire resistance is measured in minutes, with an FD30 door offering 30 minutes of protection and an FD60 door offering 60.
Understanding the differences between FD30 and FD60 is essential for ensuring your building meets specific safety and compartmentation requirements.
Higher ratings are available depending on the levels of risk. It is important to remember that a fire door is not just the door leaf, as it includes the frame seals, glazing if present, and ironmongery.
You should (if installed correctly) find fire doors in stairwells, corridors between high-risk rooms like plant rooms and kitchens, and in flats within multi-occupancy buildings. They are required where compartmentation is necessary to protect escape routes and prevent the fire from spreading between different areas.
Essential components of a fire door
The performance of a fire door depends on more than just the material. The seals are incredibly important as intumescent seals will expand when exposed to heat and help to prevent the spread of smoke. It is vital that these are correctly fitted and intact.
Fire-rated hinges are also required on all fire doors. These are typically made of steel and must support the weight of the door during fire conditions.
All locks and latches must also be fire rated, as incorrect Ironmongery can compromise the integrity of the entire door.
Fire doors must be fitted with self-closing devices to ensure that doors are not left open. Electromagnetic holders can be used to release the door during fire alarm activation. It is essential that fire doors are never wedged open.
Types of fire door materials
The core and facing materials of a fire door will determine its fire resistance and durability. Timber fire doors are most common in commercial and residential buildings and are constructed using a solid timber core or composite core, which is often engineered wood.
This is typically finished with veneer, laminate or paint-grade surfaces and offer aesthetic flexibility that is suitable for offices, schools and healthcare settings. These timber fire doors can achieve FD30, FD60 and higher when correctly constructed and certified.
Steel fire doors are made from galvanised steel with an insulated core. These tend to be found in industrial environments, warehouses and plant rooms thanks to their high durability, impact resistance and low maintenance. These are most often used where security and fire protection are both priorities.
Glass fire doors are constructed using fire resistant glazing panels and can either be fully glazed systems or timber or steel frames with glazed sections. Specialist fire-rated glass is designed to resist heat, maintain integrity and sometimes provide insulation. They are best suited for offices, commercial buildings or areas that require visibility and light transmission.
Aluminium fire doors use aluminium framing systems combined with fire-rated glass or insulated cores. They are extremely lightweight in comparison to steel and therefore tend to appear in modern commercial developments or high traffic public spaces as they offer an aesthetic appeal with a slimmer profile.
How do the materials perform?
When it comes to fire resistance, all certified fire doors must meet tested fire ratings, and their performance will depend on their core construction, seals and installation quality. Steel and timber fire doors can both achieve high ratings, whilst glass systems will depend on the certified fire-resistant glazing.
For durability, it is hard to beat steel, which is not only highly durable but also resistant to impact. Timber is also durable but may require maintenance depending on the finish that has been used. Aluminium doors are resistant to corrosion and suitable for modern designs.
Fire doors are there to perform an important function, but most businesses will still want them to look good. Timber and glass offer the greatest levels of design versatility, whilst steel has a more functional and industrial appearance.
The environment that fire doors are going to be located in is also an important factor. High-traffic industrial areas will need steel fire doors whilst a commercial office is better suited to timber or glazed. Security-sensitive areas will benefit from the robustness of steel and design-led environments tend to prefer glazed or aluminium systems.
Current fire door regulations in the UK
Fire doors fall under the Regulatory Reform (Fire Safety) Order 2005 and Building Regulations (Approved Document B). In multi-occupancy residential buildings, fire door checks are required under the Fire Safety (England) Regulations 2022.
All responsible persons must ensure that fire doors are installed correctly and maintain and inspect them on a regular basis. Compliance involves using certified fire door sets, ensuring the correct installation, and conducting routine inspections. Certification and traceability are critical to ensure that all doors are compliant with UK regulations.
How to choose the best fire door for your business
You will need to start by conducting a thorough risk assessment where you identify the level of fire risk, the required fire resistance, and the type of occupancy of the building. The building type and usage will also be very important as industrial, commercial and residential needs will vary. High traffic areas may also require more durable materials.
Aesthetic requirements will also be a consideration as visible areas may require timber or glazed systems, whilst back-of-house areas can prioritise function. Compliance and certification is essential for all fire doors, so make sure that you choose certified fire door sets and ensure that your installers are competent.
Ongoing maintenance is also very important, so you need to consider the inspection requirements of each type of fire door. Businesses must factor in the durability of their door and life cycle costs.
Fire doors are a vital part of passive fire protection and the material used will affect its performance, durability and suitability for the environment. Compliance is reliant on certification, correct installation, and ongoing inspection.
Selecting the right fire door involves balancing fire rating, environment design and regulatory requirements to ensure that your business and everyone within it is safe.