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.
Product Features & Benefits
- Lowest vapour resistance of all breathable membranes
- No ventilation required
- Hydrophobically treated
- Type LR underlay
- Strong 3 layer material
- Recyclable
- UV stable for 4 months
- Superior nail tear strength
Area of Application
- Cold and warm roof applications
- Being both air open & vapour permeable further minimises the risk of condensation forming, particularly during the drying out period of a building
- Batten spacing 350mm
UK Wind Zone map
Permo air zones 1-3 at maximum overlap batten gauge and all zones with Permo TR plus tape.
Material
Permo air is a strong 3 layer product consisting of UV stabilised PP fleece and a high performance Meltblown layer.
Roll size / Roll weight / Packaging
50m x 1.00m (50m2) / 8kg / 20 rolls/pallet
Product Code
KU0045-1 (50m x 1.0m)
Certification
CE certified
BBA certified
Related Products
To protect the Permo air at the eaves and to prevent ponding, Underlay Support Trays are available along with a range of adhesive tapes. Eaves closers are available for counterbattened roof structures. Wallint 50 and Wallint solar air barriers and vapour control layers.
Installation
Permo air should be laid in accordance with our installation details set out in the BBA approved certificate. An unsupported underlay should provide a drape between
rafters sufficient enough to ensure that any water will run away from the batten fixing nail penetrations at rafters, and allows it to drain to the eaves gutter.
Contact between the membrane and the roof covering should be avoided during and after installation. Permo® air should be laid with a maximum drape of 15mm.
Est Delivery between
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Delivery will always take place on a weekday (Mon - Fri).
For information on delivery costs and more view our delivery info page.
Rated Excellent
