Permo forte  


Permo® forte is an extremely strong 4-layer vapour permeable underlay with a built-in safety grid. It is suitable for all pitched roofs. Permo® forte should be laid in accordance with our installation details and BBA/IAB Certificates.


  • Suitability/use Suitable for warm and cold pitched roofs.
  • Material(s) Strong laminated sheet material, with outer layers of polypropylene, an inner layer of microporus polyethylene film and re-inforcement mesh.
  • Special features Very strong and robust vapour permeable underlay, 4 layer material with grid, UV stable for 4 months, Double hydrophobically treated, Allows the roof structure to breathe, yet fully waterproof, Counterbattens only required on fully supported application, Limits air leakage in a sealed roof application, Type LR underlay
  • Pack quantity 20 rolls per pallet, 25 x 1.5m - 35 rolls per pallet