Key point
Evidence first
Confirm rating, smoke duty, certification route, wall type, opening size and whether the existing frame can legitimately remain.
Installation and emergency support
For fire door installation, call the team with the postcode, photos, urgency and any product details ready.
Installation specification
Fire Door Installation
Is the opening suitable for repair, or does it need a documented replacement doorset? Treat the door as one tested assembly: leaf, frame, seals, hinges, closer, latch, lock, glazing, letter plate, threshold, fixings and wall interface.
Certified doorset option
Frame and wall prep
Measured gaps
Protected ironmongery
Sign-off evidence
Key point
Measure the opening
Record frame rebate, structural opening, floor finish, threshold, out-of-square faces and the wall gap before ordering.
Key point
Fit the tested combination
Frame, seals, hinges, closer, latch, lock, glazing, letter plate and intumescent protection must match the evidence.
Key point
Hand over proof
Photos, labels, product data, gap readings, installer details and operation checks make the door inspectable later.
Installation specification diagram
Door set, frame, seals, hardware, evidence
Survey
Install
Record
Planning focus
Fire door installation specification with component callouts
Sign-off schedule
Four records that matter later
01. Certified option
Rating, manufacturer data, permitted sizes, trim limits and compatible parts.
02. Measured fit
Head, jamb, meeting edge, threshold, wall gap and closing-force checks.
03. Protected cut-outs
Hinges, lock cases, keeps, glazing, letter plates, viewers and cable routes.
04. Handover pack
Photos, component schedule, labels, installer details and maintenance limits.
Specification matrix
Component checks by location
Flat entrances
Self-closing action, smoke seals, resident security, certified letter plate, viewer, management access, and inspection record ownership.
Commercial escape
Panic hardware, closer strength, latch engagement, access control release, signage, abuse resistance, and traffic durability.
Service rooms
Restricted access, frame fire-stopping, ventilation conflicts, ironmongery protection, threshold gaps, and maintenance access.
Spec 01 - Survey the opening before ordering
The survey should capture the building risk, the opening, the users, and the existing evidence. A good installation decision depends on more than door size; it needs the fire strategy, escape route, smoke-control requirement, traffic level, security need, and the condition of the surrounding construction.
- Record the door location, required resistance period, smoke suffix requirement where applicable, opening direction, swing clearance, floor finish, threshold detail, and whether the door opens onto a protected route.
- Measure the structural opening, frame rebate, leaf size, floor undercut, wall type, stop depth, architrave coverage, and any out-of-square or bowed surfaces that will affect gaps.
- Photograph existing labels, plugs, hinges, closer, latch, lock, seals, glazing, letter plate, viewer, access-control equipment, damage, and any previous alterations.
- Confirm the operational requirement: flat entrance, corridor cross-door, riser door, plant room, stair door, commercial escape door, access-controlled door, or high-use service plan.
Spec 02 - Prove leaf, frame, and doorset compatibility
Certification normally applies to a defined assembly. A fire-rated leaf installed into an unknown or unsuitable frame can lose its evidence trail, especially if the frame material, density, section size, rebate, stops, fixings, or wall interface differs from the tested arrangement.
- Prefer a complete certified doorset when the frame condition, original rating, or component compatibility cannot be proven.
- Retain an existing frame only when it is sound, securely fixed, correctly sized, compatible with the required rating, and supported by manufacturer or assessment evidence.
- Do not plane, trim, rout, drill, or enlarge cut-outs beyond the limits allowed by the door leaf or doorset instructions.
- Keep certification labels, plugs, markings, data sheets, and installation instructions visible, legible, and linked to the door location in the records.
Spec 03 - Control gaps, thresholds, and frame fire-stopping
Fire doors need controlled clearances so the door closes reliably while seals can perform. Typical top and side gaps are kept in a narrow millimetre range set by the manufacturer or doorset evidence; thresholds need particular attention where smoke control, carpets, uneven floors, or drop seals are involved.
- Check head, jamb, meeting-stile, and threshold gaps with the door closed and latched, then record readings at multiple points rather than relying on one visual check.
- Avoid solving excessive gaps by adding oversized seals, extra stops, or surface strips unless the door evidence specifically permits that repair.
- Fire-stop the gap between frame and wall with the tested or specified combination of packing, mineral wool, intumescent mastic, foam, architrave, or other approved material.
- Recheck clearances after carpets, thresholds, drop seals, smoke seals, latches, closers, and decoration are complete because those items can change the closing action.
Spec 04 - Keep seals and intumescent protection continuous
Intumescent strips expand under heat to protect the door edge, frame rebate, hardware cut-outs, glazing apertures, and other weak points. Smoke seals restrict cold smoke in everyday temperatures. Their position, size, continuity, and compatibility need to follow the tested design.
- Fit perimeter seals in the location specified for the door leaf or frame, keeping corners continuous and avoiding paint, debris, crushed fins, or gaps behind loose strips.
- Use intumescent pads, lock kits, hinge protection, glazing systems, letter plate liners, and closer or access-control protection where the certification requires them.
- Do not mix random seal sizes or brands to compensate for poor joinery; the seal is part of the tested fire-resisting assembly.
- Check that smoke seals do not prevent the closer from shutting the door fully into the latch or against the stop.
Spec 05 - Match hinges, closers, latches, and locks
Ironmongery is a performance component. Hinges carry the door weight under heat, the closer returns the leaf to the frame, and the latch or lock may be needed to hold the door closed against smoke, pressure, or everyday use.
- Fit the specified number, grade, size, fixing pattern, and intumescent protection for hinges; pay particular attention to the top hinge because it carries heavy load.
- Set the closer so the door shuts fully from normal opening positions without slamming, dragging, bouncing, or stopping short of the latch.
- Choose latches, locks, cylinders, escutcheons, handles, panic hardware, electric strikes, maglocks, and access-control releases that are suitable for the fire door evidence and escape strategy.
- Protect lock cases, strikes, cable routes, and access-control cut-outs with the intumescent kits or tested details specified by the manufacturer.
Spec 06 - Evidence glazing, letter plates, viewers, and apertures
Any hole through a fire door changes the assembly. Vision panels, glazed screens, letter plates, air transfer grilles, viewers, cable routes, and surface-mounted devices need evidence for the exact fire and smoke performance required.
- Use fire-rated glazing, beads, liners, seals, and fixing details that match the door rating and permitted aperture size.
- Fit fire-rated and smoke-resistant letter plates only where the door evidence allows them, especially on flat entrance doors opening onto communal routes.
- Avoid adding viewers, chains, bolts, signage fixings, access readers, or cable holes without checking whether the alteration is allowed.
- Replace damaged glazing beads, loose letter plates, missing liners, and oversized cut-outs rather than treating them as cosmetic defects.
Spec 07 - Adjust the specification to the door location
Flat entrance doors and commercial fire doors often need different decisions. A flat entrance door protects a private dwelling and a shared escape route; a commercial door may need heavy-use durability, panic escape, access control, acoustic control, or hold-open release linked to the fire strategy.
- For flats, confirm self-closing action, smoke seals, letter plate compatibility, resident security, management access, and responsibility for inspection records.
- For commercial escape doors, coordinate panic hardware, access control, signage, door closers, electromagnetic hold-opens, and any fail-safe or fail-secure requirement.
- For communal cross-corridor doors, check double-door meeting stiles, selectors, closers, hold-open devices, smoke seals, and abuse-resistant hardware.
- For riser, plant, service, and bin-store doors, consider durability, restricted access, smoke leakage, ventilation conflicts, and maintenance access.
Spec 08 - Sign off the installation with evidence
The handover pack should prove what was installed and how it was checked. Without records, future inspectors may have to treat the door as unknown, even if the visible finish looks tidy.
- Record installer name, competence evidence, date, door location, rating, manufacturer, certification reference, component list, and any permitted variations.
- Include photos of labels, plugs, frame fire-stopping before cover-up, seals, hinges, lock protection, glazing details, letter plate, threshold, and final gap readings.
- Handover operation checks for self-closing, latching, smoke seals, access control, escape hardware, signage, and any known maintenance limits.
- Keep manufacturer instructions, data sheets, test or assessment evidence, warranties, inspection frequency, and alteration restrictions with the building fire safety file.
FAQs
Fire Door Installation FAQs
Short answers for separating product research, fitting, survey and urgent callout work.
Is a fire-rated door leaf enough on its own?
No. The door leaf is only one part of the assembly. The frame, stops, seals, hinges, closer, latch, lock, glazing, letter plate, fixings, threshold, and wall interface all need compatible evidence for the intended rating.
When is a certified doorset better than replacing the leaf only?
A complete certified doorset is usually the clearer option when the existing frame is damaged, undocumented, out of square, too small, poorly fixed, unsuitable for the rating, or already altered in ways that cannot be evidenced.
What gaps should a fire door have?
The correct gaps are the manufacturer or doorset evidence values for that assembly. In practice, top and side gaps are normally kept to a tight low-millimetre tolerance, while threshold gaps depend on smoke-control requirements and the bottom seal or floor detail.
Can larger seals fix excessive gaps?
Not by assumption. Oversized or substitute seals can change closing force, smoke leakage, and fire performance. Gap repairs should follow the door evidence or a competent remediation specification.
Can locks, letter plates, or viewers be added after installation?
Only where the component and cutting detail are allowed by the fire door evidence. Apertures and mortices normally need fire-rated components plus intumescent liners, pads, or kits matched to the certified assembly.
What should be included in a fire door installation handover pack?
The pack should include the door rating, certification or assessment evidence, component list, installer details, date, location references, gap readings, photos before cover-up, final operation checks, manufacturer instructions, and maintenance restrictions.
Are flat entrance fire doors different from commercial fire doors?
Yes. Flat entrance doors need to protect a home and communal escape route, often with smoke seals, self-closing action, secure resident locking, and controlled letter plates. Commercial doors may need panic escape, access control, hold-open release, and heavier-duty hardware.
Installation and emergency support
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