Permavent Breather Membrane


Permavent’s membrane easily out performs other heavier roofing underlays such as the Tyvek. The independent tests from the BBA show just how good our roofing felt really is. The example below shows how our lighter weight breather membrane is stronger and more flexible than its competitors heavier membranes.

Permavent MAX Tyvek Supro Proctor Roofsheild Klober Permoforte
Base weight 140 145 175 175
Tensile strength 245.5 275.5 230 324
Elongation 93% 21% 37.5% 15.5%
Mail tear 180 125 143 156
Breathability 1343 935 2409 1034
Water tightness >600 237 114 >200
Vapour resistance 0.15 0.22 0.09 0.20



Please visit our trade counter or call 01254 300 222 to place an order. Our technical team are always on hand to answer any questions you may have regarding Permavent products.