Permavent RED

Permavent RED

Ultra strong vapour permeable membrane


Permavent RED is a heavy-duty vapour-permeable roof membrane, which has gained the trust of roofing contractors all around the UK. Red’s superior tensile strength and exceptional nail-tear resistance help create an excellent secondary barrier to wind and rain both during and following the construction process:

‘The quality of the membrane is second to none’ – Gareth Swan, G Swan & Sons Roofing Services.


Additional benefits:

  • A resilient roofing underlay, tailored for long-term roofing projects with a UV stability of 3 months.
  • A superior water-resistance (W1), provides a flexible design solution in pitched roofs and walls; for new-build, commercial or refurbishment projects.
  • In-house and external technical teams are on hand to assist you with your next project.


  • Ultra strong breather membrane
  • 160 g/m2
  • Superior tensile strength
  • Superior tear resistance
  • Fully BBA Certified
  • Conforms to BS 5534:2014 +A2:2018
  • 3 layers membrame
  • UV stable for 3 months
  • For use on any types of roofing/walling applications
  • Available in 1m x 50m and 1.5m x 50m rolls


Weight, g/m2160
Water tightness, classW1
Water vapour transmission (sd),m0.02
Maximum tensile force (MD), N/50mm350
Maximum tensile force (CD), N/50mm240
Elongation at max. tensile force (MD), %70
Elongation at max. tensile force (CD), %70
Resistance to tearing MD (nail shank), N140
Resistance to tearing CD (nail shank), N230

UK Wind Zones

Taped Lap1-5
Battened Lap1-5
Request Sample

Related Products

Single Sided Tape

  • High adhesion.
  • Ideal for roofing applications.
  • Membrane repair tape.

Double Sided Tape

  • High adhesion
  • Ideal for roofing applications
  • Multi material use

Low pitch system for slates

  • Unique breathability and condensation control
  • Extends the life of the roof by keeping battens dry
  • Creates new areas for slate application
  • Pitch as low as 10° with fibre cement slates

Low pitch system for plain tiles

  • Pitch as low as 17.5°
  • Creates new areas for plain tile application
  • Extends the life of the roof by keeping battens dry