Fire resistance testing represents a significant investment for doorset manufacturers. However, the commercial value of a successful test extends beyond the performance of the individual specimen. By considering the direct and extended application of test results during product development, manufacturers can establish the evidence required to support a wider range of product configurations, potentially reducing additional testing costs and improving their ability to respond to customer requirements. Understanding The Limitations of a Fire Resistance Test BS EN 1634-1 specifies the method for determining the fire resistance of door and shutter assemblies and openable windows. The test establishes the performance of a particular assembly under standard test conditions. For doorsets, this includes the interaction between the door leaf, frame, glazing, hardware, seals, supporting construction (the wall) and installation details. Changes to these components can influence fire resistance performance. For example, increasing door leaf dimensions, modifying glazing arrangements or substituting hardware may affect the behaviour of the assembly during a fire. Consequently, a successful test does not automatically establish equivalent performance across every configuration within a manufacturer's product range. The extent to which test results can be applied to alternative configurations is determined through the applicable classification and field of application rules. Direct Field of Application BS EN 1634-1 includes a direct field of application that defines permitted variations to a tested construction, subject to specified conditions. The application of these provisions requires competent technical evaluation of the test evidence and the relevant classification requirements. This is documented through a classification report prepared in accordance with BS EN 13501-2. The report establishes the applicable fire resistance classification and identifies the field of application, including permitted variations from what was tested. Where variations are supported by the direct field of application, they can be included within the classification without additional testing, provided all relevant conditions are satisfied. However, these provisions are specific. They do not permit unrestricted changes to dimensions, materials, components or installation arrangements. Manufacturers should therefore ensure that proposed product configurations fall within the documented field of application before making fire resistance performance claims. Extended Field of Application Where a proposed variation falls outside the direct field of application, extended application (EXAP) may provide a means of establishing a wider field of application using existing and, where necessary, additional fire resistance test evidence. BS EN 15269-1 establishes the general requirements for extended application of test results for doorsets, shutters and openable window assemblies. The other parts of the BS EN 15269 series provide specific rules for different product types and constructions. For hinged and pivoted timber doorsets, BS EN 15269-3:2022 provides rules for extending the application of fire resistance test results obtained in accordance with EN 1634-1. Annex A of BS EN 15269-3:2022 defines the construction parameter variations that may be considered. These are organised into six sections: Section A – Door leaf (Table A.2): Variations relating to the door leaf, including dimensions, construction, materials, seals and finishes. Section B – Door frame (Table A.3): Variations relating to door frame construction and its constituent materials and dimensions. Section C – Items of building hardware (Table A.4): Variations involving hinges, locks, latches, closing devices and other building hardware. Section D – Side, transom and over panels (Table A.5): Variations involving the configuration and construction of associated panels. Section E – Glazing (Table A.6): Variations involving glazing and its associated construction details. Section F – Supporting construction and attachment of door frame or side/over panels (Table A.7): Variations involving supporting constructions and attachment arrangements. Each construction parameter variation is subject to specific rules that determine whether an extension is possible using the available evidence or whether additional testing is required. The process requires evaluation by a person competent in fire resistance testing and extended application, in accordance with BS EN 15269-1 and the relevant product-specific part of the series. Not every variation will be permissible, and additional testing may be necessary. An extended application report is prepared in accordance with BS EN 15725 and the requirements of BS EN 15269-1. The results are then used to prepare a classification report in accordance with BS EN 13501-2, establishing the supported fire resistance classification and field of application. The Commercial Importance of Test Programme Design The potential benefits of extended application are greatest when manufacturers consider their intended product range before commissioning testing. A test programme developed around a single configuration may provide limited support for subsequent product variations. Where those variations fall outside the available field of application, further testing or technical evaluation may be required. Conversely, identifying the intended range of sizes, glazing arrangements, hardware and supporting constructions at the outset allows the testing strategy to be developed around those requirements. This can help manufacturers: Reduce unnecessary testing: Identify where existing evidence and applicable extended application rules can support proposed configurations. Improve market responsiveness: Establish supported product variations before they are requested by customers. Support product development: Identify the technical limitations that may influence future design decisions. Control compliance risks: Ensure declared fire resistance performance is supported by evidence applicable to the product supplied. Provide investment clarity: Establish a defined testing roadmap, allowing business leaders to understand the intended product range, anticipated expenditure and expected commercial outcomes before committing to the programme. · Improve return on investment: Direct expenditure towards commercially important product configurations rather than commissioning individual tests and only subsequently establishing their potential extended application. This approach also provides a basis for measuring the outcome of the programme against its original objectives. Once testing and classification are complete, manufacturers can establish which planned configurations are supported, identify any outstanding evidence requirements and assess the commercial value delivered by their investment. Maintaining Control of the Supported Product Range Developing appropriate evidence is only one part of demonstrating product performance. Equally important is ensuring that the evidence can be understood and applied consistently across the business. A clearly structured suite of extended application and classification reports should define the supported product configurations, permissible construction parameter variations and any applicable restrictions in a manner that is accessible to product development, sales, manufacturing and technical compliance teams. This makes it easier for commercial teams to identify and sell configurations supported by appropriate evidence, while making it more difficult for unsupported variations to be offered or manufactured without further technical review. The reports can also form the basis for product specifications, configuration controls and approval processes that prevent unauthorised substitutions or modifications. For business owners and shareholders, this provides an important additional benefit. By reducing ambiguity and strengthening control over the products being supplied, manufacturers can better manage their exposure to compliance failures, contractual disputes, remedial costs and reputational damage. Ultimately, well-defined and accessible technical evidence helps manufacturers maintain control over their product offering and reduces the risk of products being placed on the market with fire resistance claims that the available evidence does not support. Making Testing Investment Work Harder Fire resistance testing should be considered as part of a manufacturer's wider product development and evidence strategy. A successful test establishes valuable performance information. Competent evaluation, classification and the application of direct or extended application rules determine how that evidence can support other product configurations. Considering these requirements early can help manufacturers make more informed decisions about testing expenditure, product development and market opportunities. At UKTC, our Technical Services team support manufacturers in developing test programmes and evaluating the field of application of their fire resistance evidence. By establishing the intended product range and evidence requirements at the outset, manufacturers can make better use of their testing investment while maintaining confidence in the performance claims associated with their products. Developing a new doorset range or reviewing existing fire resistance evidence? Contact UKTC to discuss your testing, classification and extended application requirements. About the Author Andrew Hutchison, Operations Director Andrew Hutchison is Operations Director at UKTC, bringing extensive experience in fire testing, product certification and regulatory compliance. Holding a Master’s degree in Engineering from the University of Glasgow, Andrew has played a key role in developing UKTC’s testing capabilities and achieving UKAS accreditation. With a strong focus on improving industry standards, Andrew shares his technical knowledge and insights to help manufacturers navigate evolving regulations, demonstrate product performance and contribute to a safer built environment. Connect with Andrew

Your product has a classification of B-s1,d0. Would it still achieve that same classification when it's installed on site? Most people read a classification report the same way. Find the class, check it matches the specification, and move on. That's not the full picture, a classification only tells part of the story. Until you know how the product was tested, it may not reflect how the product is actually being used on site and that could mean a very different performance in the event of a fire. A classification has to be used alongside the field of application to identify how a product has been tested and how it can be installed and used on site. What is the Field of Application? This section of a classification report sets out exactly what your classification covers: the substrate the product was fixed to, how it was fixed, whether there was a cavity behind it, where the joints sit, and which adhesive was used, and how much. Fire tests are carried out on products as they're intended to be installed, not as they're sold. A lining fixed tight to masonry can behave very differently to the same lining on battens with a ventilated cavity behind it. That's why one product can hold several classifications. For example, a product with the classification of B-s1,d0 fixed directly to a non-combustible substrate may only achieve C-s2,d0 over a cavity. Same product, same factory, same day - a different result, because the installation has changed. When the evidence stops applying Nothing about the product itself has to change for a classification to change - the installation can change instead. If someone value-engineers the backing board or swaps in a different adhesive, the product on site can look identical to the one that was tested, while the evidence no longer covers it. Five questions worth asking about every classification report you rely on: What substrate was it tested on, and is that what your customers actually build on? Was there a cavity in the test? Is there one on site? Does the report name a specific adhesive, or a generic type? What thickness range does it cover, and are you selling outside it? If the product can be fitted either way round, were both faces tested? Scrutiny of fire test evidence has moved a long way in recent years. A classification that doesn't match the installation isn't a technicality - it's a gap in the evidence chain. Not sure your classification still matches how your product is used? Contact our Reaction to Fire Test Experts. United Kingdom Testing & Certification, A SOCOTEC company, are a UKAS accredited laboratory for reaction to fire and fire resistance testing. Its reaction to fire test suite allows manufacturers to test and prove performance with a BS EN 13501-1 classification. On average, the UKTC team issue test and classification reports within two weeks of the test.

On 2 September 2026, we reach exactly three years until references to BS 476 for fire resistance are removed from Approved Document B. From 2 September 2029, manufacturers, specifiers and building control bodies in England will no longer be able to rely on Approved Document B's references to BS 476 fire resistance testing. Three years can sound like plenty of time. In practice, transitioning a product’s fire performance evidence from BS 476 to the EN testing and classification system is rarely a quick job. It's worth understanding now what that transition actually involves - and why the manufacturers who start planning early will be in a stronger position than those who leave it late. What's Actually Changing Approved Document B currently allows fire resistance to be demonstrated using either the British Standard (BS 476) test methods or the European (BS EN) equivalents. From September 2029, the BS 476 route is removed from the guidance. Products will need fire resistance evidence based on the EN testing and classification system, principally to BS EN 13501-2, supported by testing to the relevant BS EN test standards. This doesn't mean every BS 476 report becomes worthless overnight, or that every product needs retesting immediately. It means that, from that date, BS 476 evidence will no longer be recognised as a route to compliance under Approved Document B guidance for new specifications. Why Three Years Isn't as Long as It Looks A transition programme for a single product range can involve several distinct stages: Evidence review – establishing exactly which products, configurations and applications currently rely on BS 476 test data. Gap analysis – identifying where existing EN evidence already exists, where it's partial, and where none exists at all. New testing or assessment – scheduling fire resistance tests where necessary and using Extended Field of Application (EXAP) reports to extend the scope of existing EN test evidence. Certification updates – updating third-party certification schedules and technical documentation to reflect the new evidence base. Each of these stages takes time, and they don't always run in a straight line. A test result that falls short of expectations can send a product back to development before retesting is possible. Factor in enough of those cycles and a three-year window starts to look considerably shorter. Testing Capacity Is Worth Thinking About Now As the deadline approaches, it's realistic to expect testing laboratories to see increased demand from manufacturers all working towards the same date. Booking slots, sample preparation and furnace availability all become harder to secure the closer you get to 2029. Manufacturers who plan their testing programmes early are more likely to secure the dates that suit their production and commercial timelines, rather than working around whatever capacity remains. Prioritising Where It Matters Not every product needs attention at once. A practical starting point is to prioritise based on: Commercial importance – which products or ranges generate the most volume or margin. Current specification activity – products actively being specified into live projects should take priority over those with limited ongoing demand. Evidence gaps – products with no EN evidence at all versus those where an EXAP could extend existing test data relatively quickly. This kind of triage means resources go where they can have the greatest impact, rather than treating the whole portfolio as equally urgent. What Manufacturers Should Do in 2026 Your priority should be to understand where you are in the transition cycle: Which products still depend solely on BS 476 evidence? Where does EN evidence already exist, and does it cover the full scope you need? Starting this work now, rather than in 2028 or 2029, means testing costs can be spread over a longer period, laboratory slots can be booked with more flexibility, and technical decisions can be made without the pressure of an approaching deadline. How UKTC Can Help UKTC works with manufacturers of passive fire protection and construction products to plan exactly this kind of transition. That includes fire resistance testing to current EN standards, review of existing test evidence, scoping analysis to identify gaps and opportunities for test programme planning, classification reports and EXAP development. If you want to understand where your product range stands against the 2029 deadline, speak to UKTC. We can review your existing evidence, identify gaps and help you build a structured testing and transition programme.

Ask most people what third-party certification gives them, and they'll describe a document: a logo, a certificate number, maybe a PDF they can download and file away. That's understandable. It's the part everyone sees but it's the least useful part of the story. A certificate is a summary. The value sits behind it, in the evidence, controls and ongoing assessment that justify the claim being made. The real question isn't "does this product have third-party certification?" It's "what evidence, controls and ongoing assessment sit behind that certification?" That question is about to get a lot more attention. The Government's 2026 Construction Products Reform White Paper proposes minimum transparency requirements for third-party certification schemes, stating that certificates should contain sufficient information to evidence product performance claims, including test results. The White Paper sets out the Government's proposed direction, providing a clear indication of how construction product certification is expected to develop. In this blog, we take a look at what should sit behind a third-party certification scheme that meets the proposals of the Construction Products Reform White Paper. What is third-party certification? Third-party certification, sometimes referred to as construction product certification, is independent verification that a product meets defined requirements. For construction products, this can combine assessment of test evidence with factory production control, surveillance and periodic review to provide continuing assurance of performance. The certificate is the end result, not the evidence A certificate exists because a wider process has taken place: testing, assessment, factory checks, ongoing surveillance. The certificate is the conclusion of that process, not a substitute for it. That distinction matters because certification can easily slide into a "certificate equals compliant" mentality. It's a convenient shorthand, but it isn't the same as understanding what has actually been demonstrated. Anyone specifying, purchasing or approving a certified product should be able to see the reasoning behind the claim, not just take the outcome on trust. The fire testing evidence behind the certificate Fire resistance or reaction to fire test reports, classification reports, Direct Field of Application rules and Extended Field of Application reports can form part of the evidence base that certification draws on and interprets. Certification draws on suitable technical evidence alongside assessment of the manufacturer's production controls and management systems. Together, these provide the basis on which certification can be awarded and maintained. Certification isn't a replacement for suitable test evidence; it's a framework for applying that evidence correctly and consistently. Anyone relying on a certificate should be able to trace it back to the reports that support it. Factory production control Testing a carefully prepared specimen tells you what's possible under controlled conditions. It doesn't tell you what leaves the factory every day. That's where factory production control comes in: the manufacturer's own quality systems, documented processes and material or component controls that keep everyday production in line with the certified specification. Certification bodies assess these controls because consistency, not just a one-off test result, is what makes a certificate meaningful over time. It's a distinction the White Paper itself draws: it defines product certification as a broader process than testing alone, describing it as ongoing assurance of compliance built on testing, factory production control and evaluation together - not any one of those in isolation. Ongoing surveillance Ongoing surveillance supported by periodic audits and reassessment is what keeps certification current. A certificate issued several years ago and never revisited isn't much of an assurance. This is one of the clearest differences between certification and a one-off test report: certification is meant to provide continuing assurance, not a snapshot frozen at the point of issue. This is why so many specifiers and contractors demand third-party certification from their supply chains. What happens when the product changes? Manufacturing rarely stands still. A new hardware supplier, a different core material, a changed adhesive, an altered manufacturing process, larger dimensions, a new glazing system - any of these can affect whether the original evidence still applies. Product changes need to be controlled because even relatively small variations can affect whether existing evidence and certification remain applicable. Depending on the change, it may already be covered by the product's Direct Field of Application or an existing EXAP. Where it falls outside that scope, additional testing or assessment may be required. This is why manufacturers need a clear process for notifying their certification body whenever a certified product changes. The certification body can then determine whether the existing evidence remains suitable or whether further testing or assessment is required. Without this process, certification can gradually move outside the scope of the evidence that originally supported it. What exactly has been certified? A meaningful certificate should let someone identify, at minimum: The product and how it's identified The manufacturer The product's construction or specification The performance characteristics covered The standards and scheme requirements applied The scope and limitations of the certification Its current validity status This matters more for some products than others. Let’s look at fire doors as an example; relatively small changes to construction, hardware or dimensions can undermine the evidence that originally supported a claimed performance. A certificate that doesn't make the specifics clear leaves too much for assumption. Another crucial element when verifying a certificated product is that when a certificate lookup returns a single word - valid - it tells you very little. Specifiers need to understand the scope of what's covered, the performance claims being made, and the limitations attached to them, not just whether a certificate is currently active. The 2026 White Paper's proposed minimum transparency requirements are aimed squarely at this gap, so that users can more easily understand what different certification schemes actually do and don't provide. UKTC ensure schemes provide publicly accessible certification information, with certificates linked to the scheme rules under which they were issued. This information is held digitally in the UKTC ensure vault, providing stakeholders with a single source of truth. Through the product label or certificate, stakeholders can access the UKTC ensure vault to check the current certification status and view the information supporting it. Certification and the golden thread Certification information connects to product identification and traceability, and increasingly to the golden thread. The White Paper's direction of travel points toward greater use of digital product information, identifiers and records to support accountability over a building's lifecycle. This is the direction UKTC ensure was built around: Accessible certification information with publicly available scheme rules and clear revision numbers to allow stakeholders to align certification with the applicable rules. Traceable product certification through labelling that features a QR code to access a single source of truth that holds the certificate and relevant evidence. Clear labelling that identifies the manufacturer, expected product performance and year of manufacture. Annual surveillance and factory production control audits that provide ongoing assurance that applicable management and production requirements continue to be met. These key features all link back to the golden thread of building safety information. These features support the wider move towards accessible, traceable product information and help manufacturers contribute to the golden thread of building safety information. So, next time you’re looking at your own third-party certification, or if you’re reviewing your supply chain, can you answer these questions… Are you confident that the third-party certification will hold up to public scrutiny? Is the third-party certification scheme ready for regulatory reform? Because in today’s market, the question that matters isn't whether a product carries third-party certification. It's what stands behind it. See what sits behind UKTC ensure Explore UKTC ensure's approach to transparent, traceable third-party certification and see how certification information can be accessed by manufacturers, specifiers and contractors.

Fire testing of products has two distinct disciplines, reaction to fire testing and fire resistance testing, and they answer two entirely different questions. As a UKAS-accredited fire testing laboratory, this is one of the most common points we help manufacturers at the start of their test journey work through. So, here's the distinction, explained through the lens of the fire itself. The dividing line: flashover Every compartment fire follows a broadly similar journey: ignition, growth, and, if not controlled, flashover, the point at which the fire transitions from a localised, growing event into a fully developed fire engulfing the entire compartment. After flashover, temperatures rise dramatically and survivability inside that space significantly drops. That single moment is the cleanest way to separate the two test regimes. Reaction to fire testing sits before the point of flashover. It's concerned with how a material behaves during the early growth of a fire – how easily it ignites, how much heat it releases, how quickly flame spreads across its surface, and how much smoke it produces. These characteristics directly affect how fast a fire can grow and whether it reaches flashover in the first place. Fire resistance testing sits after flashover. It assumes a fire is fully developed and asks whether a building element can contain it for a defined period. This can include walls, doors, floors and penetration seals. If you’re new to manufacturing, or developing a new product, understanding which side of flashover your product sits on is usually the fastest way to identify which test route applies. This will help you get your product ready to test and ultimately get your product to market faster. Reaction to fire testing: how a material behaves as a fire grows Reaction to fire testing examines the combustibility characteristics of a material and its contribution to fire growth and spread. In the UK and Europe, the results feed into a BS EN 13501-1 (Euroclass) classification - the A1 to F scale. You can read more about reaction to fire classifications here. Since BS 476 reaction to fire testing was withdrawn in the UK in March 2025, BS EN 13501-1 classification is the only available and compliant route for manufacturers. The specific test method depends on the classification being targeted, but typically includes a combination of the tests listed below: Single Burning Item (SBI) test (BS EN 13823): exposes a product to thermal attack from a single burning item to assess flame spread, heat release, and smoke production Small flame test (BS EN ISO 11925-2): assesses ignitability under direct flame contact Non-combustibility test (BS EN ISO 1182): identifies products that produce negligible heat or flame at high temperature, relevant to the highest Euroclasses Gross heat of combustion / calorific value test (BS EN ISO 1716): determines the maximum potential contribution a product could make to a fire Reaction to fire testing is the route for surface materials and products whose primary fire risk is contributing to growth and spread - external cladding, insulation, roofing materials, membranes, and wall linings etc. Fire resistance testing: how a building element performs once fire takes hold Fire resistance testing measures whether a building element can maintain its function under intense thermal attack for a defined period usually expressed in minutes, from 30 up to 240. Performance is assessed against three criteria, often seen together as an R E I rating: R — Load-bearing capacity: does the element continue to carry structural load E — Integrity: does it prevent flames and hot gases passing through I — Insulation: does it limit temperature rise on the unexposed face, so the next compartment doesn't ignite. Products undergoing a fire resistant passive fire protection, the first line of defence protecting escape routes, compartmentation, and structural integrity during a fire. It applies to elements like doorsets and hardware, walls and partitions, glazing systems, penetration seals, and linear joint seals. These are the components that can ensure life safety in an event of a developed fire. So which test does your product need? In practice, the question to ask is: what job does this product do in the building, and at what point in the event of a fire does that job matter? If your product is a surface, lining, or material whose main fire risk is how it ignites, burns, or contributes to a growing fire, you're almost certainly looking at reaction to fire testing and a BS EN 13501-1 classification. If your product is a building element expected to hold a line, physically separating one space from another, while a fire is fully developed, you're looking at fire resistance testing against the relevant BS EN standard for that element type. Here’s a side-by-side comparison. Reaction to Fire Testing Fire Resistance Testing Before flashover After flashover How does the product contribute to fire? Can the element contain the fire? Ignition, flame spread, heat and smoke Integrity, insulation and load-bearing capacity Materials and surfaces Building elements Ensuring Life Safety United Kingdom Testing & Certification (UKTC) is a UKAS-accredited fire testing laboratory offering reaction to fire and fire resistance testing for construction & building products. Our testing allows manufacturers to evaluate performance and ensure compliance with regulatory requirements. If you’re ready to start your next test program, or even if you’re unsure where to start, contact our team by clicking here.

Nine years on from the Grenfell tragedy, Dame Judith Hackitt has a warning for the built environment: the industry has made real progress, but part of the system is still catching up. Presenting as the keynote speaker at the opening ceremony of UKTC’s new fire resistance laboratory, the architect of the Building Safety Act reflected on the journey since her 2017 independent review and the Grenfell Tower Inquiry. Her message was clear - regulatory reform is underway, culture is shifting, and competence is finally being taken seriously as a major factor. Here are some of the key takeaways… The single regulator and its three pillars Dame Judith used her speech to map out how England and Wales' new single construction regulatory system is taking shape. Rather than one flat rulebook, it rests on three interdependent pillars: Design and construction of buildings Construction products and their testing Professions and competence of all the people involved Dame Judith said “Let’s be clear when we talk about these as pillars, they are not independent. Far from it. They are very interdependent and we have to now plot a course through this series of changes we’re making.” None of these pillars stands alone. A competent designer specifying a non-compliant product is still a failure. A well-tested product installed by someone who doesn't understand how it performs as part of a system is still a risk. Hackitt was explicit that consistency is what the new system has to achieve; and testing sits at the physical centre of that picture, because it's where a claim about a product either holds up or doesn't. Beyond compliance, not around it One of the more nuanced points in Hackitt's talk was her distinction between compliance and competence. Compliance, she argued, is the bare minimum; a demonstration that you've met the guidance. However, guidance can't anticipate every scenario, and a tick-box mentality has historically been part of the problem, not the solution. What Dame Judith is calling for instead is a sector where competent people use test evidence and sound judgement to ask a harder question: are we confident this is genuinely safe, not just technically defensible? That shift doesn't remove the need for guidance and standards - if anything, it raises the bar on how rigorously products need to be tested and how transparently that evidence needs to be shared, because judgement without solid data is just guesswork with confidence. Andrew Hutchison, UKTC Operations Director, reflected on Dame Judith’s comments, “This shift in attitude reframes what testing is for. It’s not a hurdle to clear before launch, but the evidence base that lets designers, specifiers, and building owners exercise genuine judgement about the products they're putting into buildings, new or already occupied. This is exactly why we have invested to increase our capacity and services as well as developing a certification scheme that gets verifiable information into the hands of those who need it, when they need it. Manufacturers are already looking at testing differently, and those that don’t could be left behind.” The proposed General Safety Requirement Hackitt also brought attention to the direction of travel in the white paper on construction products: a proposed General Safety Requirement that would extend responsibility for using the right products beyond manufacturers alone, to procurers and specifiers too. In practice, it means test evidence is no longer something a manufacturer produces once and files away. It becomes something the whole supply chain - architects, contractors, building owners, responsible persons - needs to be able to see, understand, and rely on. Accessible, credible, third-party test data isn't a nice-to-have in that model; it's the mechanism that makes the whole requirement workable. UKTC ensure enables exactly that, a UKAS accredited third-party certification scheme that bridges the gap between the physical product and the evidence hosted within a single, verifiable source of truth. The takeaway for anyone specifying, procuring, or manufacturing Hackitt closed her speech by returning to why all of this matters, a built environment that people can have confidence in, and a legacy owed to the 72 people who died at Grenfell Tower. Nine years into this journey, the message from one of its most influential architects is that the industry has come a long way on regulation and culture. Testing and product assurance is the pillar that now needs to catch up and every accredited test carried out today is part of closing that gap. The role of test laboratories in the built environment. As a UKAS-accredited fire test laboratory, our role isn't to advise on whether to use a product, it's to provide the independent, rigorous evidence that lets manufacturers, specifiers, and building owners make that judgement with real confidence, not assumption. UKTC deliver fire resistance, reaction to fire, and smoke leakage testing from its UKAS accredited laboratory to both British (BS) and European (EN) standards. Alongside a suite of testing, UKTC also offer Extended Field of Application (EXAP) and Classification reports to enable manufacturers to transition from BS to EN before the 2029 removal of BS 476. In response to the demand for clearer labelling and verifiable traceable evidence, UKTC established UKTC ensure. The first UKAS accredited third-party certification scheme to be aligned with the golden thread by providing an accessible, traceable and verifiable chain of product safety information from clear product labelling. UKTC ensure has certification schemes for both fire doors and security doors whilst offering dual scope certification for compliant products. Click here to talk to our team about your test requirements and discover how UKTC can help you prove compliance and meet regulatory demand. About Dame Judith Hackitt Dame Judith Hackitt is a distinguished chemical engineer and former Chair of the UK Health and Safety Executive, and led the landmark Independent Review of Building Regulations and Fire Safety following the Grenfell Tower tragedy, fundamentally reshaping building safety standards across the United Kingdom

United Kingdom Testing & Certification, a SOCOTEC company, celebrated the official opening of their new fire resistance laboratory on the 9th of July. The day was marked with a ceremony that seen over 100 colleagues and guests from across the industry attend to witness a live fire test and a keynote speech delivered by Dame Judith Hackitt. The new combination furnace, one of the only commercially available in the UK, was unveiled with a curtain drop to start the day off with Ellen Johnson, UKTC’s Compliance Officer and longest standing employee given the privilege of pressing the big red button to drop the curtain and launch the confetti. Ellen shared, “It’s an honour to be asked to take part in today’s event alongside individuals that are at the forefront of the industry. Although I was the person that pressed the button, I was representing every one of my past and current colleagues that have contributed to the growth of UKTC over the last 6 years.” Following the grand reveal, guests took to their seats situated in the new laboratory and listened intently as Andrew Hutchison, UKTC Operations Director, introduced Dame Judith Hackitt. Dame Judith’s presentation covered the progress made so far in the construction and testing industry in the wake of regulatory reform as well as the need for culture change, competence levels and the journey the industry is on to make the built environment safer for everyone. On why test laboratories matter now more than ever, Dame Judith commented, “This is why facilities like this are going to be so much in demand because everything is being looked at again in terms of the efficacy and the reliability of the way that we test and assure products in this sector." Lunch came street food style, with Pizza and Taco food trucks fuelling the networking hour. There were prizes up for grabs too, from discounted fire tests to Tunnock’s Teacakes. Guests made the most of the Scottish sunshine, swapping notes with construction industry peers before heading back into the laboratory to watch a 5m fire resistance test led by UKTC’s Head of Testing, Daniel Fitzsimmons. The day wrapped up with an expert panel Q&A where the audience had the opportunity to have their burning questions answered by the panel. Dame Judith Hackitt, Stephen Garvin, Head of Building Standards at the Scottish Government, Dr. Andrew Taylor of the ASFP, and Beth Dean of Maze Consulting made up the panel of experts. Topics including CE marking, BS EN 13501 classifications and further regulatory reform made for great debate and insight from the panel. Andrew Hutchison, UKTC Operations Director, said, “It’s been great to share this milestone moment for the UK’s fire safety industry with so many dedicated professionals. This investment will directly contribute to a safer built environment by significantly increasing the testing capacity within the UK for manufacturers.” Matthew Marriott, CEO of SOCOTEC UK & Ireland, added: “This investment represents our commitment to providing the most advanced fire testing capabilities available, we can now provide a massively expanded service to key clients across the construction, infrastructure and manufacturing sectors – helping them achieve their critical fire safety compliance needs. “With building safety regulations continuing the evolve, it is important to continue our investment into cutting-edge technology that helps us stand out from our competitors. This second firehall is a statement from us, that UKTC and the wider SOCOTEC business will continue to remain at the forefront of development and service offering.”

Minimum test dimensions meet the standard. They don’t always meet the real world. Most fire resistance testing in the UK is conducted in a 3x3m furnace. Perfectly valid, but it can leave a gap between laboratory evidence and the way wall systems, facades, and insulated panel constructions actually behave in a building. Testing at 5 meters starts to close that gap. In an industry where architects and specifiers are building upwards with complex and innovative designs, relying on assessments from old testing may not be deemed acceptable. Testing at a height of 5m allows specifiers and manufacturers to prove concepts work safely whilst achieving the necessary test evidence. What a 5m Test Can Reveal Fire and heat rise. As a result, it creates pressure differentials, drives hot gases into cavities and subjects joints and fixings to cumulative stress far beyond what a 3m test could replicate. At 5m, a fire resistance test can reveal: Flame spread and cavity barrier performance over realistic heights. Bowing, joint opening and fixing failures under sustained thermal attack. Chimney effects within cavities. Panel joint behaviour across multiple courses of construction. Structural movement that only develops at scale. These behaviours are conditions that wall systems and facades face in commercial and industrial buildings every day. It is crucial that manufacturers can prove their systems work, and that can only be done through testing. Stronger Evidence for Extended Field of Application (EXAP) Testing at 5m also supports Extended Field of Application reports. Broader evidence results in less uncertainty when applying test data to configurations and heights beyond those directly tested. In a regulatory environment shaped by increasing scrutiny of fire performance claims, test evidence that more closely reflects real installation conditions is not a bonus. It is increasingly expected. What fire tests can be done at 5m tall? UKTC’s combination furnace allows tests to be carried out at 5m tall to the following standards: BS EN 1364-1:2015 (Non-Loadbearing Walls & Partitions) BS EN 1634-2:2008 (Door, Shutter and Openable Window Assemblies and Hardware) By using UKTC, tests to the above standards will be accompanied with UKAS accredited reports; crucial for proving performance to the marketplace. A Laboratory Built for Manufacturers For manufacturers of wall systems, sandwich panel, cladding, and facades, large-scale test evidence supports: Product differentiation Insurer and client confidence Broader application of results UKTC’s 5m fire resistance test capability is available now. If you’re developing or validating a system that needs to perform at height, or you want to extend your scope, contact our team for a confidential chat.

The revised BS 8214:2026 tightens the rules on smoke leakage measurement for fire and smoke control doors including a critical change that removes a long-standing loophole at the threshold. Let’s take a look at what’s changed. Smoke kills more people in building fires than heat or flame. It is for precisely this reason that smoke leakage performance is not an optional feature of a fire door, it is a life-safety requirement, and one that the updated BS 8214:2026 treats with renewed rigour. Whether you are a specifier, installer, building owner or fire risk assessor, understanding how smoke leakage is tested, classified, and maintained is now more important than ever. This blog unpacks the key requirements of BS 8214:2026 as they relate to smoke leakage testing: what the tests measure, what performance levels are required, and what has materially changed from previous practice. What Smoke Leakage Testing Actually Measures Smoke is not just a visibility problem. It is the transfer of airborne particles from the products through gaps in a fire door assembly; around the perimeter, at the threshold, between meeting stiles on double-leaf doors, and at any aperture in the leaf. Even a well-constructed door with proven and tested fire performance can allow lethal quantities of smoke to pass through if its gaps are not adequately sealed. Both test methods referenced in BS 8214:2026 approach this by measuring air leakage under a controlled pressure differential in a laboratory chamber. The tests are similar in principle and produce comparable results, but they sit within different classification frameworks. The Two Test Routes BS 8214:2026 recognises two valid test standards for demonstrating smoke leakage performance: BS 476-31.1 is the established British Standard method, measuring smoke penetration through doorsets and shutter assemblies under ambient temperature conditions. BS EN 1634-3 is the equivalent European test standard for smoke control performance of door and shutter assemblies, used when seeking a European classification. The test evidence, no matter what test is completed, must form part of the supporting documentation for the fire door and be referenced in the manufacturer's specification. Performance cannot be assumed, inferred, or carried over from a different assembly without appropriate assessment or extended field of application (EXAP). The Required Performance Level for Smoke Testing The standards are precise about the leakage rate a smoke control door must achieve. BRITISH STANDARD ROUTE ≤ 3 m³/h/m at 25 Pa, tested to BS 476-31.1, measured across the whole door assembly. EUROPEAN STANDARD ROUTE Sa4 Class classified to BS EN 13501-2, tested to BS EN 1634-3, with threshold sealing included. Both thresholds are equivalent in stringency. The 3 m³/h per metre figure represents the maximum acceptable air leakage per metre run of the gap between the door leaf and the frame. This is measured at a pressure of 25 Pascals across the whole assembly, including the threshold. The Major Change: Threshold Sealing Is Now Mandatory This is arguably the most significant practical change introduced by the 2026 edition, and one that will affect many existing and future installations. In previous practice, it was considered acceptable to measure smoke leakage performance at the head and jambs of a door only, leaving the threshold gap unsealed during testing. That approach is now explicitly rejected by BS 8214:2026. KEY CHANGE IN THE 2026 EDITION The smoke leakage performance of a door must now be measured across the whole specimen including the threshold and, where applicable, the meeting stiles. The former practice of measuring head and jambs only is no longer deemed acceptable. In practical terms, this means that any door intended for smoke control duty must incorporate an effective bottom-of-door sealing system. The standard's preferred solution is a drop seal, a mechanism that is automatically forced downward by spring pressure when the door is in the closed position, creating a continuous seal at the threshold without impeding the opening and closing action. The standard is careful to note that drop seals introduce their own design considerations. They should not be used in isolation from the wider smoke control strategy. Pressurisation systems, for instance, can prevent doors from closing fully, while sloping or uneven floors may compromise seal effectiveness. These factors must be identified and addressed during specification, not left to the installer to resolve on site. The System Is Greater Than the Sum of Its Parts Perhaps the most important principle running through BS 8214:2026 is that smoke leakage performance cannot be attributed to any single element of a fire door assembly. It belongs to the entire system: the seals, the frame, the threshold detail, any glazing, the hardware, the quality of the frame-to-wall seal, and the competence of the installation. This means that everyone in the supply and installation chain, from the manufacturer who establishes the tested specification, to the installer who achieves the required gaps and seal continuity on site, to the building owner who ensures the door is not subsequently modified, carries a share of responsibility for maintaining that performance throughout the door's working life. The 2026 guidance update to close the threshold loophole is not a bureaucratic refinement. It reflects a recognition that real smoke does not stop at a convenient height above the floor. A door that performs at its head and jambs but leaks freely at the base provides a false sense of security, and in a fire, false security costs lives. Smoke Leakage Testing United Kingdom Testing & Certification provide UKAS accredited Smoke Leakage Testing to both BS EN 1634-3 and BS 476-31.1. Manufacturers can test for both smoke leakage and fire with one specimen at a single location. If you would like to learn more about smoke leakage testing, including how much a smoke leakage test costs, click here.

At the 2026 edition of the Fire Safety Event, we took the opportunity to ask the people who matter most, the fire safety professionals working in our industry every day, what they value, what frustrates them, and how their current test providers are performing. Over 150 responses later, the results make for a compelling read. Participants were asked to rate a number of key factors, including UKAS accreditation, service provision at one location, report turnaround time, cost and laboratory location, between 1 (of little importance) to 5 (most important). Here's what they said... UKAS accreditation came out on top by a clear margin with an average score of 4.6, underscoring just how important recognised, trustworthy fire testing is to the industry. Closely behind were the practical considerations of service breadth and speed of reporting, while cost and location, though relevant, ranked lower than some might expect. Overall satisfaction with test providers sits at a modest 3.51 out of 5, suggesting the industry as a whole feels there is meaningful room for improvement. Notably, those who currently test with UKTC scored their satisfaction at 4.05, compared to 3.10 for those using other providers. Andrew Hutchison, UKTC's Operations Director, commented on the results, "The message from the industry is clear... Accreditation, efficiency, and service breadth matter far more than price alone. At UKTC, these priorities are at the forefront of everything we do and the satisfaction scores from our own customers reflect that commitment." A full summary of the survey results can be viewed in the graphic below. Participants were entered into a prize draw with a free fire test at UKTC up for grabs. Rob Wakefield of Rockwool UK was the eventual winner and will benefit from a free UKAS accredited fire test at UKTC's fire resistance laboratory. If you're looking for a testing partner that delivers on what the industry says matters most, we'd love to hear from you. Contact us by clicking here.

Whether you are a manufacturer preparing a product for market, an architect specifying materials, or simply someone trying to make sense of a label on a building product — this guide explains what a reaction to fire classification is, how it is structured, and what each part of it means. When a construction product undergoes reaction to fire testing, the outcome is expressed as a structured classification rather than a simple pass or fail result. This classification is defined by the European standard BS EN 13501-1, and it communicates three distinct pieces of information about how a material behaves when exposed to fire: its combustibility, its smoke output, and whether it produces flaming droplets. Understanding this classification system is an important part of knowing what fire test data actually means and how to interpret the information on a product's technical documentation. How the classification is structured A full BS EN 13501-1 classification is made up of three components written together. For example: B-s1,d0. Each part independently describes a different aspect of the material's fire behaviour. Let's look at each component in turn. Part 1: The primary classification (A1 to F) The first element describes the material's overall reaction to fire — specifically, how much it contributes to the development and spread of a fire. The scale runs from A1 at the highest level of performance down to F, which indicates no determined classification. A1 NON-COMBUSTIBLE Does not contribute to fire under any test conditions. A2 LIMITED COMBUSTIBILITY Does not contribute to the development of a fire. B COMBUSTIBILE Limited contribution to fire C COMBUSTIBLE Minor contribution to fire. D COMBUSTIBLE Contributes to fire. E COMBUSTIBLE Resists a small flame for only a few seconds. F NO PERFORMANCE DETERMINED Not classified or did not meet class E requirements. Worth knowing 💡 A1 and A2 are distinct from the classes below them. Materials in these two classes are considered to pose no meaningful contribution to fire growth — an important distinction when understanding where higher-performing products are required under building regulations. Part 2: Smoke production (s1, s2, s3) The second part of the classification describes how much smoke a material generates when burning. Smoke production is classified independently of combustibility, because a material can have a strong primary classification while still generating a significant volume of smoke. s1 LOWEST Low smoke production s2 MODERATE Moderate smoke production s3 HIGHEST High smoke production Part 3: Flaming droplets and particles (d0, d1, d2) The third component describes whether a material, when burning, produces flaming droplets or particles that detach and fall. This matters because falling burning material can ignite other surfaces or present a hazard to people below. d0 LOWEST No flaming droplets or particles d1 MODERATE Limited flaming droplets d2 HIGHEST High quantity of flaming droplets Reading a complete classification Once you understand the three components, reading a full classification becomes straightforward. Here is how to interpret an example: B-s1,d0 B COMBUSTIBLE s1 LOW SMOKE d0 NO FLAMING DROPLETS This classification tells you that the product has a limited contribution to fire, produces minimal smoke during burning, and does not shed flaming particles under the test conditions. Each component is determined through a specific series of test methods that form part of the BS EN 13501-1 test programme. Why classifications matter for product manufacturers For manufacturers, the classification is more than a label; it is the documented evidence of a product's fire performance. Construction products placed on the market are required to carry a classification so that those specifying or installing them can verify that the product meets the fire performance requirements of a particular application or regulation. It is worth understanding that a classification is always specific to the product as tested including its substrate, thickness, fixing method, and end-use application. Changes to any of these conditions may affect whether the classification remains valid for a given use case. Understanding the scope of a classification is just as important as knowing the classification itself. If you are unsure whether an existing classification applies to your product in its intended application, the appropriate next step is to consult the classification report itself or speak with a testing laboratory who can help you understand what has and has not been established through testing. Have questions about the testing process? At UKTC, we are UKAS accredited to carry out reaction to fire testing to BS EN 13501-1 and can help you understand what testing is required for your product. We are happy to discuss the process, explain what the test programme involves, and help you plan a testing scope that reflects your product's intended use. Click here to contact us.

UKTC returned to Birmingham’s NEC in April for the 2026 edition of the Fire Safety Event. The leading event for fire safety professionals in the UK attracts thousands of visitors each day and offers the perfect opportunity to network with likeminded individuals, colleagues and prospects. UKTC’s engaging stand offered plenty of information regarding its fire testing capabilities and featured a fire door and penetration seal display to offer passers-by an insight into the destructive power of a UKAS accredited laboratories furnace. These displays epitomise the importance of fire test laboratories and the scrutiny that passive fire protection products face before entering the market. UKTC ensure™, a third-party certification scheme for passive fire protection products and installers, was also demonstrated across the stand demonstrating its importance to the industry in the face of calls for clearer labelling and accountability. There was also a presentation space, dubbed ‘The Fire Test Experience’, where several of the firm’s knowledgeable fire testing experts shared their accrued competencies with gathered on-lookers, interested in learning more. This included Dan Fitzsimmons, Head of Testing, providing live commentary over a fire resistance test, Andrew Hutchison, Operations Director, discussing the road to achieving a reaction to fire BS EN 13501-1 classification, as well UKTC’s Senior Technical Services Officer, Tom Smith, talking through the process of developing Extended Field of Application reports, ahead of the incoming 2029 regulatory changes. Other talks came from Mark Garfield, UKTC’s National Sales Director, as he walked the audience through the importance of third-party certification, while representatives from SOCOTEC, the Fire Door Association (FDA) and Knauf rounded out the lineup, which also featured a panel discussion regarding the transition to EN testing, featuring contributions from the likes of ASFP, Quelfire, Isoclad and Robust UK. UKTC will be bringing the Fire Test Experience seminar area to the London Build Expo in November later this year. It’s not to be missed! To learn more about UKTC's services, contact the team by clicking here.