Permo Light is a strong three-layer, vapour-permeable roof underlay, suitable for pitched roofs. This membrane is watertight, whilst allowing the roof structure to breathe. Permo Light is BBA approved for cold and warm roofs.
Suitable for Cold and Warm Roofs.
All zones with taped headlap.
Permo Light should be installed in line with the details set out in the BBA approved certificate and the terms laid down in BS5533
An unsupported underlay should provide a drape between rafters sufficient enough to ensure that water will run away from the batten fixing nail penetrations allowing draining from the eaves gutter
Contact between the membrane and the roof covering should be avoided during and after installation