Using gypsum boards externally may seem unusual. However, Siniat has developed a specialist external sheathing board, Weather Defence, which offers major cost and time savings for projects.
Weather Defence can be used under brick, stone, timber, metal, insulated render and rain screen facades. It is a strong, highly moisture-resistant and A1 non-combustible board which is easier and faster to install than traditional alternatives.
Cutting installation times
Weather Defence’s hydrophobic gypsum core is coated with a tough, water-resistant glass mat facer, giving it superior weather-proofing. The board’s lightweight gypsum core also means that it is up to 33 per cent lighter, and therefore much easier to handle, than a standard cement particle board.
Weather Defence doesn’t require the use of any mechanical cutting with power tools and can be easily cut using a ‘score and snap’ technique before being secured with the use of a cordless drill, significantly reducing installation times.
By saving time on the installation phase, Weather Defence allows interior trades to access the site quicker and speed up the build process – a key advantage when delivering projects to tight timescales.
Weather Defence is water, weather and mould resistant and can be left exposed on frame for up to three months. It makes the building 100 per cent watertight which means internal trades – dry liners, electrical engineers, heating engineers and others – can begin work in advance of the completed façade.
Weather Defence also has fire safety benefits. Cement particle boards cannot provide effective fire resistance for structures over 18 metres in height – roughly five floors. In contrast, Weather Defence is A1 non-combustible and can be used to any height to help prevent fires spreading across floors.
A sustainable choice
Weather Defence is a smart choice for projects looking to meet sustainability targets and earn BREEAM credits. When using cement particle boards on external frames, installers have to allow for movement between the boards. However, Weather Defence is dimensionally stable and, once the joints have been sealed with GTEC Silicone Sealant, it provides consistent air-tightness and therefore improved thermal efficiency for buildings.
Most cement particle boards are not recyclable and are often imported into the UK from the Far East, greatly increasing the logistical costs and carbon miles of projects. In contrast, Weather Defence is manufactured by Siniat in the UK or France. Gypsum, the main component of plasterboard products, is 100 per cent recyclable and can be repeatedly recovered from old boards for reuse.
Sticking to what you know isn’t always the best option. Weather Defence is already in use across the residential, education, healthcare, leisure and retail sectors. It offers a smarter way of building which can cut both project costs and build times. It may not be long before it’s second nature to use gypsum boards externally.