Aluminium vs Wood Fire Doors

Clients frequently ask whether aluminium fire doors, wood fire doors, or steel fire doors come out on top. Beyond their unique aesthetics and structural material components, we are going to compare the difference in how each material withstands heat and flame.

• Timber fire doors feature a heavy, solid wood core designed to char gradually, forming a natural thermal barrier against intense heat.
• An aluminium fire door is made up of intumescent inserts, internal cooling chambers, and fire resistant glass held within a thermally broken frame. This structural combination supports a much slimmer profile that accommodates larger areas of glazing to allow more incoming light.

Comparing aluminium and wood fire doors isn’t just a matter of looks, cost, or maintenance. The real deciding factor is the door’s certified fire rating, which dictates whether it satisfies your fire strategy and passes building control.

What A Fire Door Has To Do

The job of a fire door is to divide a building into fire resisting compartments, holding the fire in the room where it started, so the fire cannot reach the corridors and stairwells people need to escape through. A fire door is a vital component of a building’s fire strategy. As the only part of a fire barrier that opens, its fire resistance is critical to maintaining total compartmentation when closed.

How the performance of a fire door is measured is against two different criterias: 

1. Integrity is the ability to stop flames and hot gases passing to the safe side. 
2. Insulation is the ability to limit how much heat passes through, so the unexposed face stays cool enough that people can walk past it and nothing resting against it catches light.

A fire door can be certified for integrity alone which means that it will contain a fire, however the fire door can still get hot enough to burn someone passing by and ignite materials that touch it. 

Both fire doors made from wood and aluminium are supplied as complete tested assemblies. The leaf, frame, glazing, seals and hardware all have to be part of a configuration for it to achieve its fire rating. If you change a hinge, a closer or a pane of glass for something untested then the classification is no longer valid.

How Timber Fire Doors Perform In A Fire

A timber fire door works because it burns predictably. As the exposed face of the door is exposed to the fire, the outer layer chars and that char slows the rate at which heat reaches the timber behind it. A dense core, whether hardwood or a purpose-made fire board, is what buys the door its rated period: more mass, more time to burn through. 

Certified timber fire doors are verified through physical identifiers, traceable technical documentation, or official conformity markings.

• Physical Identifiers: Under voluntary third-party schemes (such as the BWF Fire Door Alliance or BM TRADA Q-Mark), door leaves are typically marked with a tamper-evident label or color-coded plug along the top or side edge to identify their fire-resistance rating.
• Traceable Documentation: If a physical label is missing, removed or has been painted-over then this does not automatically invalidate the certification, so long as you have official paperwork for the fire door. This certification is valid proof of the fire doors performance which can be a UKCA/CE Declaration of Performance (DoP), a UKAS-accredited fire test report or traceable installation logs that explicitly match the exact specification of the installed leaf, frame and hardware.
• Absence of Proof: If a door leaf lacks both physical identification (label or plug) and verifiable test documentation linking it to its tested construction, you can’t assume the fire rating of the door and for safety you must treat this as non-fire-rated. 

Learn more about this in our guide on checking whether an existing door is fire rated.

A wooden fire door naturally expands and contracts as temperature and humidity shift. If it is trimmed too far during installation, or allowed to swell and warp over time, it will fail to sit within the frame as certified. Fire ratings demand constant upkeep, meaning perimeter gaps, intumescent seals and self-closing devices must all be maintained for the life of the building.

Although a timber fire door can accommodate a vision panel, the surrounding wood must bear the weight of heavy fire-rated glass while remaining stable during a fire. Cutting large openings weakens the leaf, keeping glass sizes relatively small. A wooden fire door is rarely the right choice if the main goal is to flood a space with light.

How Aluminium Fire Doors Perform In A Fire

A fire rated aluminium door is a tested system built around a hollow frame. The chambers inside the profile are packed with fire retardant inserts, ceramic or gypsum based infills and intumescent components. As the temperature climbs, those materials expand and absorb heat. The frame holds its shape, the seals close tight against the leaf and the glass stays supported, which is how the door earns a rating for insulation as well as integrity.

Fire doors are manufactured this way to control the heat within the frame. Aluminium moves heat quickly, roughly four times faster than steel, so a fire rated system is engineered to hold that heat within the profile instead of passing it to the protected side. Insulation performance is then measured on the finished assembly under test to BS EN 1634-1, which is what puts the I in an EI rating.

At Aluminium Fire Systems, we specialise in high-performance fire rated aluminium doors, windows and partitions engineered around the Aluprof MB-78EI and MB-118EI systems.

System Specifications

System	Application	Classification	Protection Level
Aluprof MB-78EI	Internal and external doorsets, fire windows and glazed partitions	EI30, EI60 and EI90	30 to 90 mins Integrity & Insulation
Aluprof MB-118EI	Extended-rating fixed glazed partitions and large-scale fire windows	Up to EI120	120 mins Integrity & Insulation

Aluminium is strong enough to hold a large pane of fire rated glass in a slim frame. An aluminium door used inside a building can be mostly glass and still carry a 30, 60 or 90 minute rating, which lets daylight through a corridor that a timber door would block. You can also install these fire-rated glass doors on outside walls, fully certified with the required UK safety paperwork. View external fire rated doors. 

The glass must strictly match what was tested for the door. You cannot swap basic flame-only glass into an EI door, as EI doors require special heat-insulating glass built to exact specifications. Read our guide on E vs EI fire safety glass to see how it works.

Provided the O&M maintenance guidelines are followed, there is no set expected lifespan of a fire rated aluminium doorset. If maintained well and properly looked after, the doors can last for a very long time. Aluminium Fire systems gives a warranty of 10 years on profiles and 5 years on glass

Wood vs Aluminium Fire Doors Pros And Cons

These are the wood vs aluminium fire doors pros and cons that change a specification. Appearance is left out, because a powder coated aluminium frame and a stained or painted timber leaf both come in whatever colour the project wants.

Both timber and aluminium fire doors can be tested under British (BS 476-22) or European (BS EN 1634-1) standards and can achieve both integrity (FD/E) and heat insulation (EI) ratings.

Feature / Standard	Timber Fire Doors	Aluminium Fire Doors
Testing Standards	BS 476-22 or BS EN 1634-1	BS EN 1634-1 or BS 476-22
British Classification	FD30, FD60, FD90, FD120	FD30, FD60, FD90
European Classification	E30–E60, EW30–EW60, EI30–EI60	E30–EI90 (Doors), up to EI120 (Partitions)
Heat Insulation (I)	Natural thermal mass of wood provides built-in heat insulation	Achieved via thermally broken profiles, internal infills and intumescent glass
Vision Panel Restrictions	Panel sizes kept small to maintain leaf strength	Large-format glazing supported by slim, high-strength frames

Your fire strategy dictates the rating you need. If a project specification demands heat insulation alongside integrity (an EI rating), any door certified for integrity alone, whether that’s a timber fire door or an aluminium fire door, will fail compliance.

Long-term maintenance is where the real material difference lies. Wood moves. If a timber door swells, warps or is planed beyond tested tolerances, it loses its certified status. Aluminium frames retain their exact dimensions over time, ensuring perimeter gaps and seals remain stable for the life of the building.

An O&M manual is sent to all customers explaining how to correctly maintain the doors and prolong their usage.

Where Steel Fire Doors Fit In

Steel is the third material that is compared when looking at fire rated doors and it suits different projects compared with wood and aluminium fire doors.

Steel fire doors use solid or hollow steel panels over a mineral or composite core. They are specified where security and impact resistance matter as much as fire performance, which puts them in plant rooms, risers, service cupboards, industrial units and external escape doors. Steel is also the usual route to LPS 1175 security ratings, which timber and aluminium door leaves are rarely tested against.

Steel doors don’t have to be solid. Like aluminium fire-rated doors, they can take larger panes of glass in slim profiles, so glazing and sightlines aren’t automatically ruled out by choosing steel over aluminium.

Wood vs Aluminium Fire Doors Cost

The cost comparison between wood vs aluminium fire doors is different depending on whether you price the leaf or the finished opening. 

• A single leaf EI30 glazed aluminium doorset from Aluminium Fire Systems starts from around £3,000. 
• A certified FD30 timber leaf can be bought for a small fraction of that, though a like for like comparison has to price the complete doorset, frame, certified ironmongery, seals and glazing rather than the leaf alone.

Three things to consider when pricing different fire door materials for your project are:

1. Glazing: If your fire strategy requires a glass fire screen across a wide opening, timber quickly hits its limits. Wooden frames become too thick and bulky to hold the heavy glass, whereas aluminium easily handles the structural weight while keeping frames slim.
2. Documentation: We have priced jobs where fire rated windows had to be ripped out and replaced because nobody could prove they were fire rated. The product may well have been fine. The evidence was not there, and the cost of that failure dwarfs the price difference between two door materials. Every AFS project is delivered with a customised Aluminium Fire Systems compliance pack covering technical specification, position drawings, test certificates, classification evidence, fabrication photographs and material invoices, built to slot into the golden thread of fire safety information.
3. Maintenance. A timber fire door needs its finish and its closing gaps kept right for as long as the building stands. An aluminium fire doorset does not need refinishing, providing the door is properly maintained.

Lead Times And Practical Constraints

Standard lead time for our fire doors is 8 weeks from order to delivery. Larger or high volume orders may need longer depending on the production schedule at the time of order. 

Because every doorset is made to the exact dimensions of the opening, the configuration has to be covered by the test evidence. A door with an overpanel and a sidescreen is only valid at the rating claimed if that assembly has been tested or formally assessed, so we check each order against the classification report before it goes into production.

Which One Should You Specify?

If you’re unsure if you want or need a timber or aluminium fire door, the best place to start if by reviewing the fire strategy for your  building. This will give you the exact period of time your fire rated doors, windows or partitions need and will outline if insulation if required as well as integrity. Our guidance on choosing between the two materials is:

• Choose aluminium where insulation is required and the opening is glazed. That covers escape routes, protected corridors people pass close to during an evacuation, glazed compartment lines across offices and receptions, and openings wide enough to need a screen built around the door.
• Choose a certified timber doorset where the opening is a straightforward, solid doorway and slim frames or maximum daylight are not a priority.
• Choose a steel fire door where security or impact resistance drives the specification.

Check the wall as well as the door. We review technical drawings on every enquiry to confirm the build up of the surrounding wall is compliant and for higher risk buildings we ask for a copy of the fire strategy so the products being requested line up with it.

Read the current law on fire doors and the Fire Safety (England) Regulations 2022 to learn more about maintenance once fire doors have been installed.

Why Choose Aluminium Fire Systems

Fire rated windows, doors and glass partitions are the whole of our business. Everyone from the person preparing your quote to the person on the machine works in fire rated systems every day.

• We manufacture in the UK, in house, which gives us control over quality, traceability and lead times.
• We are an approved Aluprof fire partner, working with proven certified systems and staying current with changes in legislation.
• Products carry the UKCA mark and independent third party certification through Certifire, with glass from approved providers listed in the product classification. 
• Every product is EI classified, managing heat transfer as well as flame.
• Every project comes with a compliance pack built to comply with the golden thread of information.
• We are the manufacturer and we sell direct.

For help settling the aluminium vs wood fire doors question on a specific project, contact Aluminium Fire Systems.

About The Author

Lauren Walker is the Managing Director of Aluminium Fire Systems. She has extensive experience in the UK fire safety and glazing industry. Lauren ensures buildings are safer through fully certified and compliant fire rated products. She combines functional safety with modern design.

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