Permavent GRAPHITE

Permavent GRAPHITE

Highly durable vapour permeable membrane


The preferred roofing underlay for many national housebuilders and supported by a number of the UK’s largest roofing contractors, Permavent GRAPHITE is a high-performance and competitive vapour-permeable membrane. GRAPHITE is a versatile secondary waterproofing barrier, which can be specified and installed UK-wide in accordance with BS5534:2014+A2:2018.


Additional benefits:

  • Perfect for new-build or refurbishment-led projects.
  • A competitive yet high-performance membrane, providing confidence when installed in conjunction with budget-sensitive projects.
  • Perfect for UK wide application, a UV stability of 3 x months and a hydrostatic head of water more than >2.0m.


  • Highly durable
  • 130 g/m2
  • Excellent tensile strength
  • Excellent tear resistance
  • 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 50m


Weight, g/m2130
Water tightness, classW1
Water vapour transmission (sd),m0.02
Maximum tensile force (MD), N/50mm245
Maximum tensile force (CD), N/50mm175
Elongation at max. tensile force (MD), %50
Elongation at max. tensile force (CD), %60
Resistance to tearing MD (nail shank), N130
Resistance to tearing CD (nail shank), N140

UK Wind Zones

Taped Lap1-5
Batten Lap1-3
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