Cembrit, the leading roofing and cladding specialist, is pleased to announce the UK launch of Windstopper Extreme – a new sheathing board that is ideal for a range of uses on UK construction projects. To coincide with the launch, Cembrit tested the board to BS EN 1634-1:2015 / BS 476:22 at the Building Research Establishment (BRE). Cembrit is delighted to report Windstopper Extreme passed the test achieving a one hour fire rating.
A sheathing board such as Windstopper Extreme is typically installed behind decorative rainscreen cladding to effectively ‘seal’ the internal environment of a building. It is an excellent alternative to cement particle board and has, following the successful fire test, proven fire resistance. Simon Mayes, National Sales Manager, Cladding and Building Boards, for Cembrit is sure that the architects, specifiers and contractors will appreciate the wide range of benefits that Windstopper Extreme offers: ‘The performance and versatility of Windstopper Extreme make it a noteworthy entrant onto the UK cladding and building board scene. We were already aware of its excellent qualities as a first class sheathing board and to add the one hour fire test on top of that extends the board’s appeal and application potential.’
Building Regulations and other documentation require building structural elements to provide minimum periods of fire resistance, usually expressed in minutes, which are generally based on the occupancy and size of the building. BS EN 1634-1:2015 / BS 476:22 determines the fire resistance of non-loadbearing elements, such as sheathing boards, of a building construction when subjected to certain heating and pressure conditions. When subjected to a 60 minute fire test, Windstopper Extreme passed with flying colours.
Cembrit Winstopper Extreme acts as a windproof membrane for exterior walls that can absorb and release moisture without affecting the durability, strength or performance of the board. This very low vapour transmission resistance, enables moisture generated inside a building to pass through to the outside. Insulation can be placed directly against the inner side of the board which is also resistant toward both rot and fungal growth. The Scandinavian heritage of Windstopper Extreme also ensures it can withstand considerable fluctuations in weather and climatic conditions.