Weather Defence® Rigid Plasterboard

Siniat Weather Defence® is an award-winning, rigid air barrier which is used behind facade cladding systems to regulate indoor environment.

Weather Defence® is suitable for enclosing a building to provide a solid weathertight barrier that forms part of the external facade system. Due to the high vapour permeability of weather defence, moisture can escape from the wall cavity when used with a vented or ventilated facade system, this controls the risk
of condensation build-up causing damage within wall spaces.


  • Rigid air barrier with Class 4 vapour permeance for climate zones 6, 7 & 8.
  • Can be exposed to either for up to 12 months.
  • Enclose buildings faster so the interior cutout can start sooner.
  • Resistant to water penetration according to AS/NZS 4201.4.
  • Provides a solid weathertight barrier.
  • Resistant to mould growth.
  • Good acoustic performance.
  • Distinctive purple colour.
  • Available in 13 x 1200 x 2400mm sheets.

Additional Information

Dimensions 240 × 1.3 × 120 cm


Sheet Size

1200mm x 2400mm




Siniat Weather Defence Rigid Plasterboard Product Catalogue
Siniat Weather Defence Rigid Plasterboard Product Data Sheet


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