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    Test method

    EN 12086 - Thermal insulating products - water vapour transmission properties

    Testing · NAC-037-TL
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    In short

    EN 12086 - Thermal insulating products - water vapour transmission properties. Amstelfy's laboratory determines water vapour transmission / resistance factor of thermal insulation products (MW, EPS, XPS, PIR, PUR, wood fibre) and building materials according to EN 12086 under its ISO/IEC 17025 accreditation (NAC-037-TL). The method is typically part of initial type testing, ETA test programmes or factory production control verification; results are reported in English for manufacturers across Europe.

    What we assess

    • water vapour transmission / resistance factor

    Products covered

    • thermal insulation products (MW, EPS, XPS, PIR, PUR, wood fibre)
    • building materials

    Accreditation status

    ActivityStandardAccreditationValidityOn scope
    TestingISO/IEC 17025:2017NAC-037-TLvalid until 2 December 2028Yes
    Product certificationISO/IEC 17065:2012NAC-026-PPSvalid until 31 January 2030No
    Validation & verificationISO/IEC 17029:2019NAC-006-VVvalid until 31 January 2030No
    NAC-037-TL — View certificate (PDF)NAC-026-PPS — View certificate (PDF)NAC-006-VV — View certificate (PDF)

    Route to market

    This test method is used inside initial type testing, ETA assessment programmes and factory production control verification. Amstelfy reports it as an accredited test under NAC-037-TL, either stand-alone or as part of a complete test programme.

    How it works

    1. 1

      Send the standard number, product description and intended use

    2. 2

      We confirm the applicable test series, sample quantities and timeline

    3. 3

      Samples are delivered to Veilmeesterweg 20, 1187 ZW Amstelveen (Mon-Fri 09:00-17:00)

    4. 4

      You receive the report in English, written for the TAB, Notified Body, evaluation service or programme operator.

    Frequently asked questions

    Yes - it is listed on the ISO/IEC 17025 testing scope NAC-037-TL.

    thermal insulation products (MW, EPS, XPS, PIR, PUR, wood fibre) and building materials.

    Yes. Samples are shipped to the laboratory in Amstelveen, 10 minutes from Schiphol; quotations, test plans and reports are in English, and correspondence is also possible in Dutch and Turkish.

    Related standards

    All Thermal insulation products & hygrothermal test methods testing