Technical Guide
A single fire door has one leaf to close and latch. A pair has two leaves that must close in the right order, seat against each other along the full height and stay shut together. That extra interaction is why double doors appear on remedial schedules far more often than their numbers suggest. This guide covers the defects specific to pairs and how we approach fixing them.
Pairs are common in corridors, plant rooms, stair enclosures, wider communal entrances and commercial circulation routes. They come as equal pairs or unequal leaf-and-a-half sets, with square or rebated meeting stiles, and with one leaf either active in daily use or kept bolted.
Each of those choices is part of the tested doorset. The meeting stile detail, the seals along it, the selector, the flush bolts and the hinge arrangement were tested together, so the repair question is always what the doorset was designed to be, not what a similar pair elsewhere looks like.
Closing sequence
On a rebated pair, the second leaf arrives first and the pair stands open on its rebate. Causes include a missing, damaged or disconnected selector, closers set at mismatched speeds, or one leaf dragging on the floor or frame.
Meeting edge
The two leaves have moved relative to each other through hinge wear, dropped leaves or differential bowing, leaving a tapering gap down the meeting edge. Correcting it is usually a rehanging and adjustment exercise before it becomes a seals exercise.
Secondary leaf
Bolts removed to make the pair easier to use, keeps filled with paint or debris, or bolts that no longer reach their keeps after the leaf has dropped. A secondary leaf that is not held shut undermines the whole pair.
Seals
The meeting edge takes more wear than any other part of the pair. Seals are often torn, painted over or missing on one leaf, which is a separate item from perimeter seals and priced as such.
Hardware clash
Retrofitted handles, pull bars or kick plates that stop a leaf passing its neighbour, or selectors fitted without matching the closers. These are resolved by selecting compatible items for the doorset rather than trimming leaves.
Leaf condition
Trolley or impact damage often concentrates on the active leaf. Whether that leaf can be repaired depends on where the damage sits relative to the meeting edge, seals and hardware.
The examples below are illustrative only. They are not records of specific jobs, and each real pair is assessed on its own construction, condition and documentation.
Hypothetical example
A report notes that a rebated pair in a communal corridor does not close fully. On site the selector arm is found disconnected. Reconnecting and adjusting the selector, then balancing both closers, may clear the item without touching the leaves — but only once the pair is shown to close in sequence from any open position.
Hypothetical example
An inactive leaf has dropped on worn hinges so its bolt no longer reaches the head keep and the meeting edge gap tapers. The likely route is hinge renewal and rehanging, then reassessing the gaps and seals. If the leaf has been heavily altered, a like-for-like repair may not be supportable and the pair is priced for replacement instead.
A pair is usually repairable where the leaves and frame are sound and documented, and the defects sit in adjustment, hanging, selector, bolts and seals. It moves towards replacement where leaves are badly altered, frames are distorted, the original specification cannot be identified, or the pair was never a suitable doorset for its location.
We would not advise trimming, packing or re-lipping one leaf to 'make it fit' the other without evidence that the change is supported for that doorset. Changes of that kind can move the pair further from its tested configuration. Our wider repair-or-replacement reasoning is set out in the linked guide below.
GOV.UK, Fire Safety (England) Regulations 2022: fire door guidance (updated 8 August 2025; accessed 26 September 2026) — simple checks for self-closing, gaps and seals that apply to each leaf of a pair.
Manufacturer and test evidence for the specific doorset remains the reference for meeting stile details, selectors, bolts and acceptable gaps. We do not publish a universal figure for these.
Related fire door components and remedial guides.
Send us the report or FRA items for your pairs, with photographs of both leaves, the meeting edge and the head, and we will return an itemised repair or replacement quotation.