Siniat Building Boards
Siniat Logo

Siniat Weather Defence Building Boards

Siniat Weather Defence is an external sheathing board faced with water repellent materials for superior weather protection, high thermal efficiency and airtight properties. The gypsum core property of Weather Defence means the product can offer superior moisture, fire and sound resistance. Ideal for external insulation and finishing systems, Siniat Weather Defence is a cost effective solution ideal for external insulation and finishing systems. The board is dimensionally stable, mould resistant, can be left exposed for up to 12 months on site and eliminates the need for breathable membrane saving time and reducing installed cost. The building board is easy to install and can be cut using the ‘score and snap’ method, meaning there is no dust or flying fragments and less waste. The board can be used with steel infill panels, full light steel framing as well as timber and concrete frame constructions. Siniat Weather Defence is Double BBA (British Board of Agrément) certified and fully A1 non-combustible, compliant for structures above 18m.

Siniat Weather Defence Specifications

Material: Gypsum

Length: 2400mm

Width: 1200mm



Main Benefits of Siniat Weather Defence

  • Dimensionally stable,
  • Quick and easy to cut and install
  • Water, weather and mould resistant
  •  A1 non-combustible

Find Out More

Interested in Siniat Weather Defence? Speak to a member of our team today to learn more about the product.


For the latest information, documentation, and downloads regarding Siniat Weather Defence we recommend you cross reference any information on our site with the manufacturer’s website, which is available here to ensure all information you are receiving is up to date.

Request a callback

    • product coming soon

    Coming Soon

    Thank you for patience, this page is currently under construction.
    We are working hard to give you the best experience on our website.

    If you are interested in this product please get in touch with
    our helpful team who will be able to assist you.

    Contact Us


    Tel: 01695 667 515

    1 Gerrard Place, Skelmersdale, Lancashire, WN8 9SU