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Klober air-open underlay for highest performance
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With a water vapour resistance of 0.03 MN/sg, Klober Permo® air is approved by the NHBC for use without supporting high level ventilation. The BBA-certified, air-open underlay has consistently proved to be the most breathable membrane available and prevents formation of condensation in the roof space during a building’s critical drying out period. Permo air has also been independently tested for wind uplift by the BRE which found it to be suitable for use up to Zone 5 on the recently introduced BS 5534 wind speed map (with laps taped or battened in zones 4 and 5).
