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Weather Defence - 2nd Generation

Weather Defence is a revolutionary external gypsum sheathing board, faced with water repellent material for superior weather protection. Strong, highly moisture resistant and A1 non combustible. Weather Defence is a faster way to a weather tight building compared to traditional sheathing board products. Complies with BS EN 15283 Type GM-H1, GM-I and GM-F.


Weather Defence is designed to be installed on;

  • Light steel infill and oversail systems on concrete and steel frame buildings
  • Modular Buildings
  • Light Gauge Steel Frame Buildings
  • Timber Frame Buildings


  • Dimensionally stable, reliable airtightness
  • 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 segregated cutting area, power tools or dust extractor¬†
  • Can eliminate the need for¬†breathable membrane saving time and reducing installed cost
  • Double BBA certified

Practical support from our technical experts

Technical support: Design stage
Technical Support at Design Stage
Technical support: On-site
Technical Support On Site