A variable moisture barrier is an intelligent membrane that adjusts moisture resistance based on the amount of moisture to which it is exposed. Condensation may be encountered if constructions are unable to ‘breathe’ properly on the cold side or in the insulation package. An intelligent self-regulating moisture barrier will help to repel moisture in the winter. However, should damp be encountered between the moisture barrier and the roof boarding in the summer, the membrane will release this moisture into the concerned area.
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Miofol® Active is a moisture-variable membrane, which is made from non-woven polypropylene and a polyethylene-copolymer film.
Tyvek® AirGuard® Smart is an airtight variable vapor barrier, which consists of HDPE Tyvek® and features a polymer coating.