WEATHER DEFENCE™ is a revolutionary new gypsum-based sheathing board, faced with a water-resistant material. It is strong, easy to cut, lightweight and highly moisture and fire resistant. Weather Defence is a faster way to a weathertight building compared to traditional sheathing boards.

Further Information


  • Facade Weather Barrier
  • Fire Resistant Walls
  • Roofs for Bushfire Areas


  • Dimensionally stable, reliable airtightness, Non Combustible
  • Quick and easy to cut and install saving time and reducing installed cost
  • Water, weather and mould resistant, can now be left installed and exposed for up to 12 months on site before you need to complete the final cladding
  • No need for cutting area, power tools or dust extractor
  • Can eliminate the need for breathable membrane saving time and reducing installed cost
  • Also tested for: FRL 60/60/60 External Walls. FRL -/120/120 Walls with PROMATECT 100 and Bushfire Rated Roofs (Both Metal and Tiles)

Please note
All physical and mechanical values are averages based on standard production and tested according to internal procedures. The typical values are given for guidance. The figures can change dependent on the test methods used. If a particular value is of prime importance for a specification, please consult Promat Technical Department.


60 Years of Expertise
Tested & Certified Solutions
Global Service Network