The ten most common reasons fire doors fail inspection

Most fire doors fail on something. That sounds alarming and mostly is not — the majority of deficiencies are small, cheap and quick to correct. The problem is that nobody is looking, so small faults sit for years until a fire prevention officer finds them all at once.

Here is what we actually find, roughly in order of frequency, and what each one means. If you want the process rather than the findings, our fire door inspection page explains how an assessment is carried out.

1. The label is missing, painted over or illegible

The label identifies the door’s fire rating and its certification. Without a legible label, the assembly cannot be verified as rated — and an inspector has no way to confirm the door is what you say it is.

Paint is the usual culprit. A contractor repaints a corridor, nobody masks the labels, and a hundred fire doors become unverifiable in an afternoon. Labels also get removed during refurbishment, damaged, or covered by applied signage.

The good news: some embossed labels remain readable once paint is carefully removed. Where a label is genuinely gone, re-labelling by a certified facility is sometimes possible — a fraction of the cost of a new rated assembly. Do not accept a quote to replace the door until someone has checked whether re-labelling is an option.

2. The door does not latch

This is the most consequential failure on the list and the one most often dismissed as a minor annoyance.

A fire door must positively latch — the latch bolt must engage the strike and hold the door closed under pressure. A door that swings shut but does not latch will be pushed open by the pressure differential a fire creates. At that point it is not a fire separation, it is a hole in a wall with a door hanging in it.

Usually the cause is a misaligned strike, because the frame has moved or the door has dropped on its hinges. We have written separately on why doors stop latching. Sometimes the latch itself is worn. Either way it is typically a twenty-minute fix involving shimming, strike adjustment or filing.

3. Clearances are out of tolerance

The gaps at the head, jambs, meeting stiles and underside of a fire door are specified, not approximate. Too wide and fire and smoke pass through the gap regardless of how good the door is.

These are measured with a gauge, not estimated by eye. Doors drift out of tolerance as hinges wear, frames shift and buildings settle. It is one of the most common findings and one of the most commonly guessed at by people inspecting without the right tools.

4. The self-closing device does not close the door fully

Released from any position, the door closer must return the door to fully closed without assistance. Closers drift out of adjustment over months, lose hydraulic fluid past worn seals, or get their arms bent by someone forcing the door.

A door that closes most of the way and stops an inch short fails. So does one that closes so slowly the latch never engages properly.

5. The door is propped open

Wedges, extinguishers, bins, chairs, cable runs. Every building has them, and everyone walks past without seeing them.

A propped fire door provides no protection whatsoever. If a door needs to stay open for operational reasons, the answer is a listed hold-open device that releases on alarm — not a wedge and an informal understanding that someone will kick it away.

6. Holes and field modifications

Holes drilled for hardware that was later removed. Cut-outs for a lock that got changed. Kick plates fitted with fasteners that penetrate the leaf. Vision panels added after manufacture.

A fire door assembly — whether hollow metal or wood — is certified as tested. Modifications outside what the listing permits invalidate that certification, even where the door still functions perfectly. This is the deficiency that most often does require replacement, which makes it worth preventing rather than discovering.

7. Gasketing and seals damaged, missing or painted

Smoke seals and intumescent strips are part of the rated assembly, not an accessory. Intumescent material expands under heat to seal the gap around the door — it cannot do that if it has been painted over, torn out during a refit, or never replaced after the door was serviced.

Cheap to fix, easy to miss, and consistently overlooked by anyone treating the door as joinery rather than as a fire protection component.

8. Hardware missing, loose or incorrect

Missing screws in a hinge. A strike plate held on with one fastener. A closer arm that has worked loose. Hardware substituted during a repair with something not listed for that assembly.

Individually these look trivial. Collectively they are how an assembly stops performing as tested.

9. Coordinators and pairs out of sequence

On a pair of doors, the inactive leaf must close before the active one so the astragal seals properly. That is the coordinator’s job, and when it fails the doors close in the wrong order and do not seal.

Pairs generally get less attention than single doors and accumulate more problems, partly because there is more to go wrong and partly because a pair that looks closed is usually assumed to be fine.

10. Glazing and vision panel problems

Rated glazing, glazing beads and their fixings must be intact and correct. Cracked glass, missing beads, or glazing substituted during a repair with a product not listed for that assembly all constitute failures.

What this means in practice

The obligation behind all of this is set out in our Ontario Fire Code guide. If you have never had your fire doors inspected, expect a long list. That is normal, and it is not evidence of neglect — it is evidence that nobody has ever looked.

What matters is the split between the list. In most buildings the large majority of findings are adjustment, alignment and hardware — a strike, a closer, a hinge, a seal. A much smaller number involve modifications or damage that genuinely require replacement.

A report that does not separate those two groups is not much use to you. Forty deficiencies with no priority is a budget problem with no starting point. Forty deficiencies graded by whether they are code failures, developing wear or cosmetic is a plan.

One thing worth asking

If someone tells you a door needs replacing, ask which of the ten items above it failed on. If the answer is anything other than field modifications or structural damage, ask why repair is not an option.

There are companies whose answer to every deficiency is a new door. That is a commercial position, not a technical one.

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This article is general information, not legal advice. Your local fire prevention officer is the authority on what applies to your building.