Norsound

Norsound is an acoustic seals brand by Norseal Ltd.

Committed to the design, development and distribution of acoustic door seals, Norsound products are manufactured using the highest grade materials and pass the most stringent of tests; ensuring the best quality every time.

Why Norsound?


  • Now part of the Athmer group, who have over 60 year experience in designing and manufacturing sealing solutions, with a dedicated manufacturing plant in Germany.

  • Extensive experience testing doorset design in partnership with the leading door core manufacturers in the UK.

  • Technical expertise in acoustic sealing solutions, for a range of door constructions.

  • Ownership of hundreds of independently-tested acoustic reports for a wide range of dBRw ratings and sealing configurations, easily accessible via our online database at acousticselector.com.

  • Solutions for compliance with current UK building regulations to high performance requirements, in excess of 40dBRw.

Testing Information


Access to our own acoustic, wind and water test lab in Germany, which tests to all current standards and is overseen and certificated by ift Rosenheim.

Based on your requirements, our consultants can design and implement a programme to run in our lab, which allows testing of a variety of components in a range of sizes.

In the lab, we can raise the sound insulation values for joints and construction elements such as doors and windows. The laboratory meets the requirements of EN ISO 10140

and comprises three rooms which together form an L shape. The rooms are separated from each other by a modular partition wall system, in one case, and by a concrete wall, in the other. Both walls have a test opening which can be quickly and flexibly adjusted to suit the elements to be tested.

Technical Information


  • All Norsound tests are conducted in accordance with BS EN ISO 10140-2 & BS EN ISO
    717-1, the harmonised European standards for measuring the sound insulation of
    building elements.

  • BS 476-31.1:1983 – Methods for measuring smoke penetration through doorsets and
    shutter assemblies.

  • BS 476-22 – Methods for determination of the fire resistance of nonloadbearing
    elements of construction.

  • Q Marked Approved – Exova BM TRADA Q-Mark fire door manufacturer scheme can
    provide additional reassurance that your products are fit for purpose through on-going
    compliance to the original product specification.

  • Approved Document M Compliant – Building regulation in England to ensure that
    people are able to access and use buildings and their facilities.

  • dBRw – Rw is the weighted sound reduction index in dB (decibels) and it describes the
    airborne sound insulating power of a building element.

  • Kerf-fit – Width of cut made by a saw blade.

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