EXTERNAL ENVELOPE 49 The case for an evidence base
Adam Boumnaia from product testing laboratory Attain RTC details the exhaustive methods used to help translate fi re test results into reliable, evidence-based applications under the UK’s evolving standards framework.
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n recent years, the UK construction sector has transitioned from historic BN British Standards to European (EN) test methods and classifi cation systems as part of a wider effort to strengthen fi re performance standards and legislation. This transition has created a more structured framework for demonstrating performance, with clearer links between what is tested in the laboratory and what is ultimately installed on site. True assurance depends not only on how products are tested, but also on how the results are interpreted and the extent to which those results can legitimately be applied.
Transitioning from single test results to defi ned applications Historically, fi re testing has often been conducted as a one-off exercise: build a sample system, test it, and record the result. The challenge arose when applying that result to products of different sizes or confi gurations, as the limits of application were not always clearly defi ned. The transition from historic BS 476 test methods to BS EN test standards and classifi cation systems addresses this issue. It incorporates rules for practical application directly into the standards framework, enabling performance to be more clearly defi ned, traceable, and consistently applied. The result of a fi re resistance test, such as BS EN 1364-1 (which replaces BS 476- 22), is used to classify the tested system in accordance with BS EN 13501-2. For example, a classifi cation of EI 240 indicates 240 minutes of integrity and insulation fi re resistance. However, the classifi cation itself is only the starting point.
Direct Field of Application (DIAP) DIAP rules are incorporated directly into the test standard. They defi ne specifi c, limited variations that are automatically covered by the test result without the need for further assessment. Depending on the
ADF JULY/AUGUST 2026
relevant standard and construction type, DIAP may permit defi ned modifi cations such as reductions in size, increases in certain component thicknesses, or other dimensional changes specifi ed within the test standard.
DIAP provides a clearly defi ned baseline scope of application, ensuring that every fi re test result is accompanied by an inherent and published range of permitted use.
Extended Application (EXAP) EXAP standards provide a structured, rules-based method for extending fi re test results using recognised technical principles. EXAP is carried out in accordance with the relevant EXAP standard, which may be supported by: • EN extended application standards • EN product standards •
European Assessment Documents (EADs)
• Relevant European Commission Decisions or delegated acts
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There is currently insuffi cient evidence to support broad conclusions regarding how products previously tested to BS476 will perform when assessed using harmonised European test methods
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