In today’s post-Grenfell regulatory environment, few terms carry as much weight — or risk — as the label “A1”.
It is widely treated as the gold standard: non-combustible, compliant, safe. As a result, A1 claims are frequently relied upon by architects, contractors, clients, and Building Control bodies when making critical design and procurement decisions.
But therein lies the problem.
A1 does not mean what many people think it means
An A1 classification under BS EN 13501-1 is a reaction-to-fire classification for a product tested in a specific, declared configuration. It is not a blanket statement that a product is A1 in every conceivable application, nor is it automatically transferable to a completed façade system.
In practice, however, A1 is often presented — intentionally or otherwise — in a way that implies broader applicability than the test evidence actually supports.
Phrases such as:
- “A1 fire rated cladding”
- “A1 façade system”
- “Achieves an A1 fire rating when installed”
are commonly used in marketing material, brochures, websites, and social media posts, often alongside images of completed ventilated rainscreen façades. To a reasonable third party, this wording strongly implies A1 suitability in use, not merely in a laboratory test arrangement.
That distinction matters.
Where misrepresentation risk arises
The risk does not usually come from outright falsehoods. It comes from ambiguity.
If an A1 classification:
- relates to a flat sheet tested on a specific substrate, or
- excludes fixings, coatings, adhesives, cavities, or rails, or
- does not reflect a ventilated rainscreen build-up,
then presenting that classification without clear limitation creates the potential for misinterpretation.
When that interpretation is relied upon downstream — in specifications, Gateway submissions, warranty discussions, or procurement decisions — the consequences can be serious.
In many cases, designers and contractors assume the necessary due diligence has already been done. They see “A1” attached to a product or project and reasonably rely on it.
Silence is not clarification
A growing concern within the industry is the difficulty in obtaining clear, written clarification when simple questions are asked about the scope of A1 claims.
Questions such as:
- Does the A1 classification apply to a ventilated rainscreen installation?
- Does it include coatings, fixings, and the installed build-up?
- What were the limitations of the tested configuration?
These are not unusual or hostile enquiries. They are routine, professional questions in a safety-critical industry.
When such questions are avoided, deflected, or met with silence, it inevitably raises further concern — not because wrongdoing is assumed, but because clarity should be readily available if the claims are being made responsibly.
Why this matters now more than ever
Under the Building Safety Act and the Gateway process, accountability has shifted. Designers, contractors, and dutyholders are expected to understand — and be able to evidence — the basis on which fire performance claims are relied upon.
“Everyone else says it’s A1” is no longer a defence.
If ambiguity exists in how an A1 claim is being communicated, it will not be marketing teams or LinkedIn posts that are scrutinised later — it will be the design team’s decisions and records.
A call for precision, not panic
This is not a call to abandon A1-rated products, nor to assume bad faith across the supply chain.
It is a call for:
- precise language,
- transparent evidence, and
- clear articulation of scope and limitation.
If a product is A1 only in a specific configuration, say so.
If a system has not been tested as installed, make that clear.
If assumptions are being made, they should be recorded — not implied.
A1 is too important a classification to be treated casually.
Final thought
In a safety-critical industry, clarity is not optional.
Where A1 claims are being relied upon, they must be understood, evidenced, and communicated accurately.
Anything less creates risk — not just technically, but professionally.
