Permo Forte

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Permo Forte

Availability: In stock

Vapour permeable membrane roll (50 x 1.5m) for use with Thermafleece insulation. Permo Forte is certified for use in cold and warm roof systems.

Every effort has been made to ensure the accuracy of the colour and texture of products on this website but due to the limitations of technology, we strongly recommend that sample products are purchased for testing in situ prior to the full order being placed.

Permo Forte for Roofs 1.5m x 50m Roll

£135.00 (Excl. VAT)


Permo Forte is a very strong, breathable, laminated sheet material, with outer layers of polypropylene, an inner layer of microporus polyethylene film and re-inforcement mesh. Suitable for non-ventilated cold and warm roof applications.

No ventilation of the roof void required. 

Roll size 1.5m width x 50m length.

Colour: outer surface light grey, inner surface white. U.V. Stable for four months.


  • Thickness (mm) 0.6
  • Water Vapour Resistance BS 3177 (MNs/g) 0.2
  • Sd Value EN ISO 12572 (M)² 0.02
  • Water Vapour Permeability BS3177 (g/m2 /day) 1034
  • Water Vapour Permeability EN ISO 12572 (g/m2 /day) ³ 1200
  • Weight (g/m2 ) 175
  • Tensile Strength DIN EN 12311-1
Technical Documents
View FilePermo Forte Data Sheet    Size: (1.4 MB)

Very strong and robust vapour permeable underlay 


Four- layer material 

BBA and IAB Approved 

Suitable for cold and warm roof applications 

No ventilation of the roof void required 

UV Stable for four months 

Hydrophobic treated