Wallint 50 is an air barrier and vapour control layer with a vapour resistance of 250MNsg, meeting the requirements of BS 9250 (Code of Practice for design of the airtightness of ceilings in pitched roofs). The air barrier and vapour control layer prevents large volumes of water vapour entering a construction from the interior, particularly during the drying-out period, whilst providing additional support for insulation boards or quilts.
The inner face of an insulated roof, wall or ceiling, including timber frame.
Suitable for cold and warm roofs.
Before Wallint 50 is installed, check the moisture content of the timbers is less than 20%. Fixed on the warm side of the installation and rafters with the printed smoother surface facing inwards.
At either edge of the structure, leave a 150mm overlap to allow Wallint 50 to be sealed to adjoining walls
Roll-out with a horizontal headlap of 150mm.Fixto rafters/ceiling joists using non-corrosive fixings eg staples. Ensurelaps are sealed using a tape such as Permo TR.
Where pipes pass through use a Klober Pipe Sealing Collar and tape edges to Wallint 50 to achieve an airtight seal.
Wallint 50 should cover the entire internal timber frame area of the rooms in the roof and, where applicable, link with vapourcontrol layer in the wall below to form a continuous air barrier