Permo® air

Permo® air, a low resistance air-open underlay. It is the ideal solution where there is a high risk of condensation forming in the roofspace. Being both air open & vapour permeable further minimises the risk of condensation forming, particularly during the drying out period of a building. Available in 2 widths 1.5m x 50 and 1m x 50m

  • KU0045-1 | 50m x 1 m (50m²) | 8kg | 20 rolls per pallet
  • KU0045-15 | 50m x 1.5m (75m²) | 12kg | 20 rolls per pallet
  • BBA,IAB and CE approved for cold and warm roofs
  • NHBC approved for no additional high ventilation
  • No additional ventilation required
  • Hydrophobically treated
  • Type LR underlay
  • Strong 3 layer material
  • Recyclable
  • UV stable for 4 months
  • Batten spacing 350mm
  • SD Value 0.009m


Permo® air is a strong 3 layer product consisting of UV
stabilised PP fleece and a high performance Meltblown layer

  • BBA Cold
  • BBA Warm
  • DOP

Counterbattens only required on fully supported applications

UK Wind Zone Guide

  • Zones 1-3 at maximum overlap batten gauge
  • All zones with Permo TR plus tape