The fire door looks perfect. Intact intumescent strips. Correct gaps. Self-closing properly. The certification plug is in the top edge of the leaf. On a standard visual inspection it scores well, and a report is issued confirming compliance.

Then the architrave is removed.

Behind it, the gap between the frame and the masonry reveal is empty. No mineral wool, no fire-stopping mortar, no intumescent foam. Just air, blocked from view by a 15 mm strip of softwood.

This is not unusual. It is one of the most common findings on every invasive fire door inspection Phoenix STS has carried out across nursing homes, hospitals, schools and commercial buildings in Ireland. And it is the single best argument for why visual inspection alone, valuable as it is, sometimes is not enough.

What standard fire door inspections actually verify

Most fire door inspections carried out in Ireland are non-intrusive. They follow the broad principles of PAS 79-1 and the inspection sequence set out in BS 8214:2026 - check the leaf and frame, verify the gap dimensions, look for damage and missing components, confirm the self-closing action, check the intumescent and smoke seals, inspect the hardware, and record what is visible.

That methodology is appropriate. It is the right approach for routine compliance, for periodic reinspection, and for the vast majority of doors in service. The 23-point assessment Phoenix STS applies to every door covers the items that fail or drift over time, and a competent visual inspection will identify the great majority of defects that affect performance day to day.

But visual inspection has a defined limit. It can only verify what is visible.

What it cannot verify, regardless of how thorough the inspector or how meticulous the report, is what sits behind the architrave. Specifically:

The presence or absence of fire-stopping between frame and structural opening
Whether the correct fire-stopping material was used, or whether anything was used at all
The gap size between frame and substrate, which determines what material is appropriate
The quality of installation behind the trim
Whether the door assembly is genuinely contributing to the line of compartmentation it sits in

If any of these is missing or wrong, the door can pass every visual check and still fail completely in fire. The intumescent strips swell, the smoke seals hold, the leaf stays in the frame - and the fire passes around the frame through the cavity behind, into the protected route or compartment the door is supposed to defend.

What Irish law actually requires

The legal framework is unambiguous on this.

Under the Fire Services Act 1981, as amended by the Fire Services (Amendment) Act 2003, the Person Having Control of a premises must take all reasonable measures to guard against the outbreak of fire and to ensure that fire safety provisions are effective. "Effective" is the operative word. A fire door that looks correct but has no fire-stopping behind the frame is not effective.

Under the Safety, Health and Welfare at Work Act 2005, employers have a positive duty to identify and manage risk based on actual conditions, not assumptions. Assuming that a door is sound because it was correctly installed at some unknown point in the past, by an unknown contractor, to an unknown standard, is not a defensible position when the risk-assessment record is challenged.

For healthcare providers, the position is tighter again. The Care and Welfare of Residents in Designated Centres for Older People Regulations 2013 (S.I. 415/2013), under which HIQA inspects nursing homes, place specific responsibilities on registered providers for the integrity of fire safety arrangements. Regulation 28 expects evidence, not assertion. A visual inspection record that cannot speak to the firestopping behind the doors is, in real terms, incomplete evidence.

This is the regulatory backdrop against which invasive inspection sits. It is not exotic. It is the proportionate response when visual evidence alone cannot demonstrate that the building's compartmentation actually works.

When invasive inspection is justified

Invasive inspection is not a replacement for routine visual inspection. It is a targeted next step, applied where the risk profile justifies looking behind the surface.

In Phoenix STS's experience, the most common triggers are:

Buildings of unknown door history. Older premises where installation records are missing, or where there has been more than one round of refurbishment with no clear hand-over documentation. The doors may have been re-hung, re-set in different openings, or installed by trades who treated the architrave as the finishing detail rather than the cap on a fire-stopped cavity.
Evidence of inconsistent workmanship elsewhere. If the visible elements of fire stopping in the building - around services, in risers, at compartment walls above ceilings - show a pattern of missing or substandard work, the doors should not be assumed exempt from that pattern.
Healthcare environments under HIQA oversight. Designated centres for older people, and other dependent-occupant settings, where the consequence of compartmentation failure is severe and where the regulatory expectation of evidence is high. Phoenix STS sees this most often in nursing homes, where the fire safety strategy depends entirely on protected sub-compartments holding for the duration of progressive horizontal evacuation.
Large estates with systemic risk patterns. Multi-building portfolios where the same contractors worked across multiple sites, the same procurement specification was used, and a defect in one location is a strong indicator of the same defect being repeated elsewhere.
Doors flagged by another assessment. A fire risk assessment, an FSC review, or a building control inspection that has raised concerns about compartmentation integrity. Invasive sampling is the evidence-gathering step that resolves the question one way or the other.

The decision to commission invasive inspection is, properly, a risk-based decision. It is not something every building needs. But where one or more of the triggers above is present, continuing with visual-only inspection means continuing to operate on an untested assumption.

What removing the architrave reveals

Architraves on fire-rated doors serve a cosmetic purpose only. They cover the joint between the frame and the substrate. They are not part of the fire-resisting construction. Removing them is straightforward and reversible.

What lies behind them, in any given installation, tells the inspector four things:

The actual gap size between the frame and the structural opening. This determines what fire-stopping material is suitable. Different materials have different limits on the gap they can bridge while maintaining their tested fire resistance.
Whether fire-stopping material is present at all. In a meaningful number of inspections, the answer is no. The cavity is air. The architrave is doing the visual concealment of an unsealed joint.
The type and suitability of the material used. Phoenix STS has found mineral wool, intumescent mastic, intumescent foam, polyurethane foam (which is not fire-rated and is not suitable), expanding plaster, gypsum-based products, and combinations of these. Not all are fit for the purpose, and the inspector's job is to identify whether what was installed has any tested fire performance for the application.
The quality of the installation. A correct material badly installed - foam that has cured with voids, mineral wool packed loose enough to fall out, mastic applied as a thin facing only - is not the same as a correct material correctly installed.

Until the architrave comes off, none of this is knowable. Once it is off, the inspection moves from assumption to evidence.

Scope agreement: the most important step before any work begins

If there is one operational and legal point that must not be skipped, it is this. Before any invasive inspection takes place, a written scope of works must be agreed with the client.

This is not a formality. Removing an architrave is, in legal terms, a minor alteration to the building. It involves trades, it generates disruption, and it produces a need for reinstatement. The client and the inspector must have a shared, written understanding of what is being done, by whom, and to what standard.

The scope of works should cover, at minimum:

Responsibility for opening-up and reinstatement

Who removes the architraves? The client's own maintenance team, a nominated contractor, or the inspector's appointed trade?
Who reinstates the architraves and re-decorates to original standard?
What is the agreed quality threshold for reinstatement - functional, matched, or invisible?
In healthcare premises, what infection-control arrangements apply during opening-up, particularly in resident-occupied corridors?
Where will any required follow-on firestopping or remedial work be specified, and who will quote and undertake it?

Sampling strategy and percentage cover

A defensible sample for a representative invasive inspection on a single building is typically 15 to 20 per cent of the fire doors. Across a multi-building estate, the same proportion stratified by building, era and contractor will normally satisfy the evidence requirement. The figures are not absolutes - they are a working range that balances confidence in the findings against disruption and cost. The sampling rationale should be written into the scope before any work starts, with a stated method for increasing the sample if early findings indicate a systemic problem.

Selection criteria

Doors must not be selected at random alone. Stratified sampling, weighted to the doors that matter most, is the right approach. Selection should include:

Doors on escape routes and protected corridors
Cross-corridor doors that define sub-compartments in healthcare settings
Doors to high fire-load rooms (kitchens, laundries, plant rooms, stores)
Doors recently installed versus doors known to be legacy
Doors in areas where other assessments have flagged concerns
Doors fitted by different contractors or in different phases of construction

Random selection within those strata is then appropriate. The combination preserves statistical credibility while ensuring the highest-consequence doors are not left out by chance.

Reporting format and threshold for action

The scope should record in advance what the report will look like, how findings will be categorised, what photographic record will accompany each finding, and what triggers an immediate escalation to the client during the inspection rather than at the end of it.

A clear scope of works, agreed in writing before the first architrave comes off, is the single biggest determinant of whether the inspection is a useful piece of evidence or a source of dispute afterwards.

Reading the findings: systemic failure versus isolated defects

The value of invasive sampling is not in the individual data points. It is in the pattern.

If three doors out of twenty have inadequate fire-stopping, that is an isolated defect set. Targeted remediation on the specific doors, with a review of the trades involved, is usually sufficient.

If twelve doors out of twenty have inadequate fire-stopping, and the defects share a character - the same gap pattern, the same wrong material, the same absence of material in a specific location - that is a systemic failure. The remediation conversation is no longer about three doors; it is about the doors as a population, the original installation specification, and the management arrangements that allowed the pattern to develop without detection.

The threshold between the two is not a fixed percentage. It is a judgement based on the consistency of the findings, the criticality of the doors involved, and the building's fire safety strategy. But the pattern is what the report should communicate first, with the individual findings as the supporting evidence.

This is the approach a competent fire safety consultant will take, and it is what the Fire Services Acts and the Safety, Health and Welfare at Work Act both, in different language, require. Risk is managed on the basis of actual conditions, and the inspection method has to be capable of producing those actual conditions as findings.

Independence: why it matters who carries out the inspection

This is a point that Phoenix STS feels strongly about, and it is built into how the firm has structured the service.

Phoenix STS does not sell fire doors. Phoenix STS does not install fire doors. Phoenix STS does not offer remedial works arising from its own inspection findings. The firm is structurally independent of the supply, fitting and remediation market.

That independence has practical consequences for the report a client receives:

Findings are not adjusted to suit a remediation quote
Remediation specifications are not biased towards a product the inspector has a margin on
The percentage of doors recommended for replacement is the percentage genuinely failing - not the percentage that supports a tender
The client retains free choice over which contractor undertakes any remedial works, with a specification that any competent contractor can price

The point is not that integrated suppliers do not produce useful reports. Many do. The point is that on a high-consequence inspection - HIQA-regulated premises, FSC compliance reviews, post-incident enquiries - the absence of any commercial conflict of interest makes the report straightforwardly easier to rely on, both for the client and for any third party (regulator, insurer, solicitor) who reads it.

The practical challenges, addressed honestly

Invasive inspection is not free, it is not invisible to occupants, and it is not without programme implications. A balanced position acknowledges that.

The real-world constraints are:

Disruption to occupants. In nursing homes, hospital wards, schools, and operating commercial premises, opening-up doors needs planning. Phased works, after-hours access, infection-control measures, and resident relocation may all be relevant. Phoenix STS routinely programmes invasive inspections around the occupied use of the building rather than the other way around.
Cost. Opening-up and reinstatement is an additional cost on top of the inspection fee. The figure depends on the number of doors sampled, the finishes involved, and the trades engaged. The honest framing is that the cost of finding out is a fraction of the cost of finding out the hard way.
Need for competent contractors. The contractor who removes and reinstates the architraves must be capable of making good without damaging the door assembly or the surrounding finishes. This is not a job for any general operative.
Programme planning. A multi-building inspection across an estate typically runs in phases over several weeks. The scope and programme are agreed up front so the client can plan operational arrangements around it.

These are real factors. They are also manageable, provided they are addressed in the scope of works rather than discovered halfway through.

Phoenix STS's approach to invasive fire door inspections

Phoenix STS offers structured invasive fire door inspection as a stand-alone service or as the next step from a baseline visual inspection. The approach is the same regardless of building type:

A pre-inspection meeting to define the scope, sampling strategy, selection criteria, opening-up responsibilities, reinstatement standard, and reporting format. The scope is signed off in writing before any work commences.
The visual inspection element, where it has not already been carried out separately, applied to every door selected for invasive sampling. Phoenix STS uses a 23-point assessment for the visual element, with photographic documentation of every finding.
The invasive element - architraves removed under controlled conditions, cavity inspected and photographed, material identified and gap dimensions recorded.
A report categorised by severity, with each finding photographed, prioritised, and accompanied by a remediation specification that any competent contractor can price.
A follow-up briefing with the client - and, where the client wishes, with their nominated contractor or design team - to translate the findings into a remediation programme.

The service is delivered nationwide across all 26 counties. The inspecting fire engineer holds a BEng in Fire Engineering. Phoenix STS is structurally independent of fire door suppliers, installers and remediation contractors; the report is the deliverable, not the doorway to a quotation.

For organisations with nursing home estates, healthcare facilities, or large commercial portfolios, invasive inspection is best programmed as part of a structured compliance pathway alongside the PAS 79-1 fire risk assessment and any planned fire door upgrade works. Phoenix STS will scope the relationship between those workstreams during the initial meeting.

Phoenix STS also runs accredited fire door inspection training and a five-day passive fire protection inspection course for client-side facilities teams and contractor inspectors who need to build the same evidence-gathering competence into their own organisations.

Questions every client should ask before agreeing to invasive inspection

Whether commissioning Phoenix STS or any other firm, these are the questions a client should expect a clear answer to before signing off the scope:

What percentage of doors will be opened up, and on what basis was that percentage selected?
Who is responsible for removing the architraves, and who is responsible for reinstating them to original condition?
How will disruption to occupants be managed? In a healthcare or care setting, what infection-control arrangements apply during opening-up?
How will findings be reported - photographically, by severity, with a remediation specification or a tender-ready quote?
What constitutes a "systemic issue" for the purposes of this inspection, and how will that be communicated if encountered mid-survey?
Does the firm carrying out the inspection have any commercial relationship with the suppliers, installers, or remediation contractors who may be involved in the follow-on work?
Are the inspectors qualified to identify and assess passive fire protection materials, not only the door assembly itself?
How long will the report take to produce after site work is complete?

A firm that cannot answer all eight of those questions clearly, in writing, before the work starts is not yet ready to undertake the inspection.

Evidence over assumption

The case for invasive fire door inspection sits, in the end, in a single sentence. In fire safety, what cannot be seen cannot be verified. Where the risk profile justifies it, invasive inspection provides the evidence the building owner needs to make informed, defensible decisions about the doors that protect the people inside.

A fire door is a system, not just a leaf and a frame. The fire-stopping behind it is part of the system. If the system has never been tested, the safest assumption is that it has not been confirmed - and a building's fire safety strategy is not the place for unconfirmed assumptions.

For related coverage on the same topic, Phoenix STS has previously published an article on fire doors in healthcare facilities and a detailed review of the changes introduced in BS 8214:2026. The BS 8214:2026 update tightens the requirement for evidence-based handover and gives the architrave-to-substrate gap explicit treatment, which makes the case for invasive sampling on legacy installations stronger again.

Phoenix STS provides invasive fire door inspections across Dublin, Cork, Galway, Limerick, and the rest of the country.

Frequently asked questions

What is the difference between a visual and an invasive fire door inspection?

A visual inspection assesses everything that can be seen with the door in place - leaf condition, gaps, seals, hardware, self-closing action, certification labelling. An invasive inspection adds a targeted opening-up step, typically removal of the architrave on a percentage of doors, to verify the fire-stopping and gap detail between frame and structural opening. The two work together; invasive inspection is the next step when the visual evidence is insufficient on its own.

How many doors will need to be opened up?

For a single building, 15 to 20 per cent of the doors is a defensible representative sample. For a multi-building estate, the same proportion stratified across buildings and contractor era. The exact number depends on the building, the risk profile, and the patterns found during the early part of the inspection - the sampling should be scalable if systemic findings appear.

Will invasive inspection damage the doors or the surrounding decoration?

Removing and reinstating an architrave, done by a competent operative, is reversible. The architrave itself is cosmetic. Provided the scope of works specifies the reinstatement standard up front, the building can be returned to its pre-inspection appearance.

Is invasive inspection a legal requirement?

No specific statute requires invasive inspection in itself. The legal duties under the Fire Services Act 1981 (as amended), the Safety, Health and Welfare at Work Act 2005, and the HIQA regulations for designated centres require that fire safety measures are effective and that risk is managed on actual conditions. Where visual inspection cannot demonstrate that the compartmentation is effective, invasive inspection is the proportionate evidence-gathering step.

Can we do this on an occupied nursing home?

Yes, with planning. Phoenix STS programmes invasive inspections around resident routines, with infection-control arrangements specified in the scope of works. Phased works over multiple visits are normal, and corridors are reinstated between visits.

What happens if the inspection finds a systemic firestopping failure?

The report sets out the pattern, the affected door population, and a remediation specification any competent passive-fire-protection contractor can price. Phoenix STS does not carry out the remedial works, so the client is free to procure them competitively. Where required, the firm will support the client through the remediation programme as the independent reviewer of completion evidence.

How long does an invasive inspection take?

Per door, the invasive element adds roughly 30 to 45 minutes to the visual inspection time, depending on architrave detail and reinstatement standard. For a typical building of 60 to 100 doors with a 15 to 20 per cent sample, expect one to two days of site work. Multi-building estates are programmed in phases.

Who carries out the architrave removal and reinstatement?

This is agreed in the scope of works. It can be the client's own maintenance team where they have the competence, a nominated contractor, or a trade appointed by Phoenix STS. The deciding factor is whoever can produce the cleanest reinstatement at the lowest disruption.

Contact Us

For expert guidance on fire safety, health and safety compliance, or training for your organisation, contact Phoenix STS. Call us on 043 334 9611 or visit our contact page.

This article is provided for general information only and does not constitute legal, regulatory, or technical advice. Any specific scope of inspection, sampling strategy, or remediation specification should be developed in consultation with a competent fire safety professional with sight of the relevant building, its records, and its fire safety strategy.