Klober‘s ‘air-open’ Permo air has recently been specified for a variety of complex roof designs due to its top performance ratings.
The BBA and IAB-approved Perm air is the ideal solution for roofs needing the highest standard of ventilation performance during the drying out period.
The underlay prevents condensation from forming in the roofspace due to high levels of breathability, a water vapour transmission ad-Value of 2736 g/m2/day, but a water vapour resistance as low as 0.03 MNs/g.
