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Klober air-open underlay surpasses NHBC standard
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With a water vapour transmission of 2736 g/m2/day, Klober Permo® air is 13% more breathable than any other roofing underlay. Being air-open, the NHBC approves its use without supporting high level ventilation, one of only two products to have achieved such a performance standard. This not only prevents formation of condensation in the roof space during a building's critical dry out period, but enables the roofline to be uninterrupted on refurbishments, a particularly critical factor with historic buildings. Hydrophobically treated, Permo air is a 3-layer, UV-stabilised polypropylene fleece with a high performance meltblown layer. Suitable for cold and warm roof applications, it has exceptional nail tear resistance, is fully recyclable and can be used in temperatures from -40°C to +80°C.
