Weather Defence™, proudly manufactured by Siniat in Australia, has revolutionised building envelope construction and performance.

Weather Defence is a rigid air barrier with a gypsum core that is used in rainscreen or ventilated facade systems.

One of the best features of Weather Defence is that it provides the quickest way to achieve a weathertight building, allowing internal trades to keep working in inclement weather conditions. This can help avoid delays and save builders and contractors valuable time on site.

Weather Defence™ is a great alternative to cement-based external sheathing boards. It is safe and easy to work with, and saves valuable time. The board can be simply be scored and snapped and there is no significant silica dust risk.

Its excellent vapour permeability makes Weather Defence suitable for cold climates. It is classified as vapour permeable Class 4 and is recommended for use in Climate Zones 2 to 8. In Climate Zone 1, it is recommended to apply a vapour barrier over the external surface. 

• Check the climate zone of your building on the NCC’s interactive climate map.
• Refer to the NCC to find out more about the latest condensation management guidelines (NCC2022 Part F8D3) and read our blog on the topic. 

Safer, quicker and smarter with Siniat's Weather Defence™!

What are the installation benefits?

Weather Defence is easy, safe and quick to install. The installation benefits include:

• Projects can be closed in from the weather early. Weather Defence™ offers up to 12 months exposure to the elements.
• It is much quicker to install Weather Defence than cement-based boards.
• No power tools needed! Simply score and snap with a retractable knife. Easy to cut in situ.
• The purple matt liner is non-woven and non-itch.
• Joints are easily sealed with Pro Clima tape to form airtight junctions around complex details.
• An additional pliable membrane may not be required, Climate Zone 1 excepted.

What components are needed for Weather Defence™ installation?

To find out more about ventilated facades and rigid air barriers, download our whitepaper:

What are the sustainability benefits?

The following properties make Weather Defence™ rigid air barrier boards a more sustainable choice:

• The gypsum core is low in embodied carbon.
• Product requires minimal packaging
• The improved airtightness helps contribute to a building’s energy efficiency.
• Ventilated facade systems improve durability of the facade by keeping external cladding dry.