Diffusion-open, weldable roofing underlay membrane

Advantages

  • Reliable seam sealing: homogeneously weldable
  • Excellent occupational safety: non-slip and abrasion-resistant surface
  • Suitable as a roofing underlay to meet the most stringent requirements
  • Maximum protection: diffusion-open, rainproof against driving rain, and highest hail-resistance HR 5 (Swiss VKF/AEAI directive) and as per EN 13583
  • Easy to work with: robust with extremely high tear-resistance
  • Also keeps structural elements dry during the construction phase: excellent protection against driving rain thanks to monolithic functional film

Areas of application

For use as a 3-ply diffusion-open, homogeneously weldable, rainproof/watertight roofing underlay membrane. Suitable for installation over pressure-resistant subsurfaces, e.g. timber sheathing, wood-based panels and wood-fibre underlay panels.

Technical specs

  Material
Functional film, both sides Monolithic TPU
Backing fleece Polyester
Property Value Regulation
Colour Blue
Surface weight 350 g/m² ; 1.15 oz/ft² EN 1849-2
Thickness 0.8 mm ; 31 mils EN 1849-2
Water vapour resistance factor µ 225 EN ISO 12572
sd value 0.18 m EN ISO 12572
g value 0.9 MN·s/g
Vapour permeance 18.2 perms ASTM E 96
Fire class E EN 13501
Outdoor exposure Cen./Nth. Europe & Canada/Nth. US: 6 months ; RoW: 4 months
Driving rain test Passed TU Berlin, GHS
Hail resistance Passed EN 13583
Hail impact resistance Class HR 5 VKF / AEAI
Minimum roof pitch
Suitable as temporary roof covering (Germany) Yes ZVDH
Water column > 4 000 mm ; > 13' 1" EN ISO 811
Watertightness, non-aged/aged* W1 / W1+ EN 13859-1 / EN 1928, GHS
Tensile strength MD/CD 320 N/5 cm / 400 N/5 cm ; 37 lb/in / 46 lb/in EN 13859-1 (A)
Tensile strength MD/CD, aged* 275 N/5 cm / 320 N/5 cm ; 31 lb/in / 37 lb/in EN 13859-1 (A)
Elongation MD/CD 50% / 70% EN 13859-1 (A)
Elongation MD/CD, aged* 50% / 70% EN 13859-1 (A)
Nail tear resistance MD/CD 200 N / 200 N ; 45 lbf / 45 lbf EN 13859-1 (B)
Durability after artificial ageing Passed EN 1297 / EN 1296
Flexibility at low temperature -20 °C ; -4 °F EN 1109
Abrasion-resistance Passed GHS
Temperature resistance Permanent -40 °C to 100 °C ; -40 °F to 212 °F
Thermal conductivity 0.04 W/(m·K) ; 0.3 BTU·in/(h·ft²·°F)
CE labelling Yes EN 13859-1