View the Klober BPi entry Visit the Klober website The variable performance of vapour permeable underlays ultimately led to the decision by the NHBC and the BSI that only air-open membranes could be used without supporting high level ventilation. Klober Permo® air offers an exceptional level of breathability, with a water vapour transmission sd-Value of 2736 g/m2/day and a water …
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