Best Fire Rated Expanding Foam for Door Frames: 2025 Expert Review
DR Joinery
Expert Joiner & Fire Door Specialist
Fitting a fire door isn't just about hanging a heavy door leaf; it is about creating a complete fire-stopping system. One of the most common failure points I see in inspections is the incorrect filling of the gap between the door lining and the rough opening.
In York's older properties, where brickwork is rarely straight and mortar lines can be deep, getting a solid fire seal is a challenge. Standard expanding foam simply melts in a fire, allowing smoke and flames to bypass the door frame entirely. You must use B1 rated fire foam.
In this review, I'll compare three fire foams I've used on site: a standard gun grade option for regular users, a complete kit for larger projects, and a handheld version for one-off repairs where you don't want to buy a gun.
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Specs vs. The Real World
The Spec: "Fire 'Proof'"
"Many people assume fire foam stops fire indefinitely."
Fire foam is 'fire resistant', typically for 2 to 4 hours depending on the depth of the joint and the wall structure. It buys time; it doesn't last forever.
The Spec: "Sound Insulation"
"Foam is just for filling gaps."
A dense, high-quality fire foam significantly improves the acoustic rating of a door set, which is crucial in flats and shared accommodation.
My Top 3 Recommendations
Three options to cover different needs and budgets
Everbuild B1 Expanding Fire Foam – Gun Grade – 750ml
Everbuild
This is the bread-and-butter foam for most joiners. It offers excellent value and reliably meets the B1 fire class. The distinct pink colour is vital for building inspectors to instantly recognise that the correct foam has been used.
The Good
- Pink identification colour satisfies building control
- Expands up to 50 times its volume
- Quick curing (tack-free in 8 mins)
The Bad
- Requires a separate foam gun
- Must be used fairly quickly once opened
Installer Tip:
Always moisten the brickwork with a spray bottle of water before applying. This helps the foam cure evenly and adhere properly, especially in dusty York brickwork.
Priced at £9.59 at the time of writing
Check Price on AmazonStick2 One Component PU B1 FR Expanding Gun Foam Bundle
STICK2
If you have a large project, such as fitting doors throughout a renovation or a house extension, this bundle is the professional route. It includes six cans, a high-quality applicator gun, and the all-important gun cleaner.
The Good
- Complete setup including gun and cleaner
- Exceptional adhesion to most building materials
- Cost-effective for multiple door installations
The Bad
- High initial outlay if you only need one can
- Gun requires maintenance (cleaning) to last
Installer Tip:
The included gun cleaner is essential. Never leave a foam gun with a half-empty can attached for too long without flushing it, or the gun will seize. This kit is great because it empowers you to maintain the tool.
Priced at £69.99 at the time of writing
Check Price on AmazonEverbuild B1 Handheld Expanding Fire Foam – 750ml
Everbuild
For a one-off job or a quick repair where you don't have a foam gun to hand, this handheld version is the solution. It has the same critical B1 fire rating and pink identifier but uses a disposable nozzle system.
The Good
- No additional equipment required
- Same high fire rating as gun grade
- Ideal for difficult to reach areas
The Bad
- Harder to control flow compared to a gun
- Messier application – wear gloves!
- Usually 'one-shot' use (nozzle blocks after use)
Installer Tip:
Handheld foam is notoriously difficult to control. Fill the gap only about 40% full, as this expands aggressively. It is better to do two passes than to have foam expanding all over your finished door frame.
Priced at £11.25 (at time of writing)
Check Price on AmazonFrequently Asked Questions
Why is the foam pink?
Can I use standard yellow foam for fire doors?
What is the difference between Gun Grade and Handheld?
Do I still need architraves if I use fire foam?
I live in York, can you fit my fire doors?
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