Permavent BLACK

Permavent BLACK

High performance vapour permeable membrane


A highly competitive and robust roofing underlay, Permavent BLACK is a versatile vapour-permeable membrane that is also suitable for walling applications. An air-tight design solution, providing associated thermal benefits, whilst assisting with condensation risk in your project.


Additional benefits:

  • Optional durable integrated tape system is available to improve speed of application and to control membrane wastage on-site.
  • A superior water resistance value (W1) catering for both roof and wall applications.
  • Discreet in colour, popular for garages and open-constructions such as canopies.


  • High performance breather membrane
  • 120 g/m2
  • Black on both sides
  • Value membrane
  • Fully BBA Certified
  • Tested to BS5534:2014 +A2:2018 wind loading
  • 3 layers membrane
  • UV stable for 3 months
  • For use on any types of roofing/walling applications
  • Available in 1m x 20m, 1m x 50m and 1.5m x 50m rolls


Weight, g/m2120
Water tightness, classW1
Water vapour transmission (sd), m0.02
Maximum tensile force (MD), N/50mm300
Maximum tensile force (CD), N/50mm200
Elongation at max. tensile force (MD), %70
Elongation at max. tensile force (CD), %60
Resistance to tearing MD (nail shank), N120
Resistance to tearing CD (nail shank), N160

UK Wind Zones

Taped Lap1-5
Batten Lap1-2
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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