Pocket doors are brilliant for saving space, but what if the doorway needs to be a fire door? It’s a common question in loft conversions, new-build layouts and three-storey homes, where internal doors off the escape route often need to be fire-resisting.
The short answer is yes: a pocket door can be a fire door, but only if you use a pocket system that has been tested and certified for that purpose, and you build it exactly as specified. This guide explains what FD30 means, how an FD30 pocket door system differs from a standard kit, and what to check before you buy.
What does FD30 mean?
FD30 is a fire door rating. Approved Document B, the fire safety guidance for Building Regulations in England, classifies fire doors by their performance in a fire resistance test. A door tested to BS 476-22 that maintains its integrity for at least 30 minutes is described as FD30. The equivalent European classification, tested to BS EN 1634-1, is E30. An “S” suffix (for example FD30S) means the door also needs to restrict smoke leakage at ambient temperatures.
Crucially, the rating applies to the whole doorset: the door leaf, frame, intumescent seals, hardware and the wall it’s built into. A fire-rated door hung in an untested frame isn’t an FD30 doorset.
Where you might need one
Whether a particular door needs to be fire-resisting depends on your property and the work you’re doing. In a house in England, Approved Document B says a protected stairway is needed once a habitable storey is more than 4.5m above ground level, which is why loft conversions often trigger fire door requirements. Its Table C1 sets FD20 as the minimum for doors onto a protected stairway in a house, and FD30S, self-closing, for the door between the house and an integral garage. Many people choose FD30 doors for stairways because they exceed FD20. Flats and other buildings have their own requirements. Your Building Control body or approved inspector has the final say, so check with them before choosing a door.
Is FD30 always what you need?
Not always, but it is the most widely available rating and a safe target for most homes. If your building control officer asks for FD30S, you’ll also need smoke seals, so confirm the pocket system has been assessed for smoke control before you buy.
Why a standard pocket door kit can’t be fire rated
A normal pocket door kit is designed for smooth sliding, not fire resistance. In a fire, gaps around a sliding door and the open pocket behind it would let flames and smoke through quickly. That’s why fire-rated pocket systems are separately tested, with specific jambs, seals and board specifications.
You can’t turn a standard kit into an FD30 one by fitting a fire door. Henderson’s pocket door kit sold through Howdens, for example, is explicitly listed as “Not for Fire Rated Doors”.
How FD30 pocket door systems work
Tested as a complete assembly
Manufacturers of FD30 pocket systems have their designs fire tested and then assessed. Eclisse, for example, says its single fire-rated system was tested to BS EN 1634-1 at Cambridge Fire Research, an independent UKAS-accredited laboratory. Its Field of Application Report, prepared by a fire safety consultancy, sets out exactly which door sizes, hardware and intumescent seals are covered. If you stay within those limits, the system is assessed to deliver the stated performance.
Intumescent seals
Intumescent strips swell when heated, sealing the gaps around the door. FD30 pocket systems specify where these strips go and what size they are. Eclisse’s technical sheet for its single FD30 system calls for 15 x 4mm graphite-based intumescent strips, for example.
Fire-rated boarding
The wall around the pocket matters as much as the door. FD30 pocket systems specify the plasterboard type and number of layers. This is why FD30 pocket walls are usually thicker than standard ones.
A certified FD30 door leaf
You’ll need to supply an approved 44mm FD30 door that meets the system’s specification. Check which door leaves the system has been certified with. Rocket Door Frames, for example, says its FD30 kits require Jeld-Wen FD30 doors.
FD30 pocket door options compared
Here’s what three systems require, based on the manufacturers’ published information:
| System | Finished wall | Boarding | Door |
|---|---|---|---|
| Eclisse Classic Single FD30 | 100mm | One layer of 12.5mm fireboard each side | 44mm FD30 timber door, up to 100kg |
| Eclisse Classic Double FD30 | 120mm | Two layers of 12.5mm Type F plasterboard each side | 44mm FD30 doors |
| Rocket FD30 70mm / 75mm / 90mm | 120mm / 125mm / 140mm | Two layers of 12.5mm plasterboard each side | 44mm Jeld-Wen FD30 door, up to 60kg |
We stock the Rocket FD30 70mm pocket door kit for a 120mm finished wall, which includes a full FD30 approved jamb kit and an intumescent pack, plus FD30 75mm and 90mm versions for 125mm and 140mm walls. We also stock the Ermetika Evokit FD30 fire rated single pocket door system, designed to be combined with an FD30 door for up to 30 minutes of fire protection. You’ll find all of these on our pocket door systems page.
Self-closers and soft close
Some fire doors must be self-closing, such as the FD30S door to an integral garage under Approved Document B. With pocket doors, that’s handled by a self-closing mechanism inside the frame. Eclisse advises checking with your building inspector before ordering to find out whether a self-closer is needed for your project. Our pocket fixing kit page includes a self-closing mechanism.
Only use closers and soft-close units that the system has been tested or assessed with. Adding an untested part could take the assembly outside its certification.
Installation: where FD30 pocket doors go wrong
Fire-rated pocket doors are less forgiving than standard ones. The common pitfalls are:
- Using the wrong boards. Standard plasterboard where fire-rated board is specified, or one layer where two are required.
- Missing or wrong intumescent strips. Every specified seal must be fitted in the right place.
- Using an uncertified door. The leaf must match the system’s approved specification.
- Going outside the approved sizes. Bespoke sizes may not be covered.
- Cutting into the frame or pocket for cables or sockets.
- Adding non-approved hardware, such as a handle or lock that isn’t in the report.
Because fire doors are life-safety products, we recommend an experienced installer, and that you keep the certification documents for Building Control.
Frequently asked questions
Can a pocket door be a fire door?
Yes, if you use a certified FD30 pocket door system with an approved FD30 door, the specified intumescent seals and the specified fire-rated boarding, all installed exactly as the manufacturer’s documentation says.
What is an FD30 pocket door kit?
It’s a pocket door frame system that has been fire tested and certified as part of a doorset providing 30 minutes of fire resistance. It usually includes fire-rated jambs and intumescent seals, but not the door or plasterboard.
Are FD30 pocket door walls thicker?
Usually, yes, because of the extra fire-rated boarding. Published examples range from 100mm (Eclisse single) to 140mm (Rocket FD30 90mm).
Do FD30 pocket doors need a self-closer?
It depends on where the door is and what Building Control requires. Check before you order, and only use a closer approved for your system.
Can I put a fire door in a standard pocket door kit?
No. The frame, seals and boarding are part of the fire rating, so a fire door in a standard kit isn’t a fire-rated doorset.
Choose a certified FD30 pocket door system
Browse our FD30 options on the pocket door systems page, and give us a call if you’d like help checking which system suits your wall and door.
