When a certified fire door leaves the manufacturer, it has already been tested to stringent standards. However, what many people don't realise is that certification doesn't automatically guarantee the door will remain compliant once it has been installed.
In fact, perfectly good fire doors can lose their fire performance because of seemingly minor changes made during installation, maintenance, or later refurbishment.
Understanding these risks can save time, money, and potentially lives.
A Fire Door Is a Complete System
One of the biggest misconceptions in the industry is that the door leaf alone provides the fire rating.
It doesn't.
A certified fire door assembly consists of multiple tested components working together, including:
- Door leaf
- Frame
- Intumescent seals
- Smoke seals (where required)
- Hinges
- Lock and latch
- Door closer
- Glazing system
- Fixings
- Approved installation methods
Every component contributes to the fire performance.
Changing just one item can affect how the entire assembly behaves during a fire.
Common Ways Certification Is Accidentally Lost
1. Changing the Hardware
Replacing hinges or locks with products that haven't been tested alongside the fire door can invalidate the original certification.
Even if the replacement appears identical, internal construction and performance may differ.
2. Trimming Too Much Off the Door
Fire doors are manufactured with strict trimming limits.
Excessive planing during installation can reduce the amount of material protecting the core and increase perimeter gaps beyond permitted tolerances.
3. Incorrect Gap Sizes
The gap around a fire door is carefully controlled.
If the clearance is too large, smoke and fire can pass through before the intumescent seals have time to activate.
4. Drilling New Holes
Adding access control systems, cable routes, viewers or additional hardware without following the manufacturer's guidance can compromise the integrity of the door.
5. Replacing Glazing
Fire-rated glazing systems are tested as complete assemblies.
Simply replacing the glass with another fire-rated pane does not guarantee compliance unless the glazing beads, seals and fixing method are also correct.
6. Painting Over Seals
Intumescent seals are designed to react quickly during a fire.
Heavy layers of paint or incorrect maintenance can reduce their effectiveness.
Refurbishment Can Introduce Hidden Risks
Many buildings undergo refurbishments several times during their lifetime.
Unfortunately, contractors working on decoration, electrical upgrades or access control systems may unknowingly alter fire doors while carrying out unrelated work.
This is why fire doors should always be inspected after refurbishment projects.
Documentation Matters
Certification isn't only about the physical door.
Building owners should also retain documentation such as:
- Certification details
- Product identification
- Installation records
- Maintenance history
- Inspection reports
These documents demonstrate due diligence and help satisfy compliance requirements during audits or inspections.
The Best Approach
The easiest way to protect compliance is to treat a fire door as a complete engineered system rather than a collection of separate products.
Choosing certified components, following approved installation guidance and carrying out regular inspections all help maintain the performance the door was originally tested to achieve.
How Premier Fire Doors Can Help
At Premier Fire Doors, we don't simply supply fire doors.
We help customers specify complete certified fire door systems designed to work together.
Whether you're managing a refurbishment, new-build project or ongoing maintenance programme, our team can help ensure your fire doors remain compliant throughout their service life.
If you're unsure whether an existing fire door has been altered or whether replacement components are suitable, we're always happy to advise.
Need help specifying compliant fire door systems?
Contact Premier Fire Doors today to discuss your project and ensure every component works together to achieve the required fire performance.
sales@premierfiredoors.com
0330 122 9550