Three-layer diffusion membrane with longitudinal self-adhesive overlap strip

TECHNONICOL ALPHA VENT diffusion membrane is intended for the protection of the thermal insulation layer of pitched roofs and ventilated facade systems from harmful impacts of water, wind and dust. Due to the high vapor permeability, the membrane contributes to the removal of excess moisture from building structures though increasing its service life without repair and cutting down energy costs.

TECHNONICOL ALPHA VENT is a diffusion membrane made of a functional microporous waterproofing layer reinforced with non-woven polypropylene fabric from both sides. It has the following advantages:

  • Longitudinal self-adhesive overlap strip increases convenience and speed of application;
  • Available in a wide range of surface densities to fit any project and area of application;
  • The marking lines on the top side of the material make installation easier, especially in the zones of overlapping;
  • Anti-glare matt surface ensures roofing work safety;
  • Resistant to molds and bacteria.

Product technical data

Surface density, g/m2
Surface density, g/m2 180±5% 150±5% 130±5% 110±5%
Tensile strength L / T, N/50 mm
Tensile strength L / T, N/50 mm ≥280 / ≥190 ≥220 / ≥160 ≥200 / ≥130 ≥140 / ≥70
Vapor permeability, g/m2×24 h
Vapor permeability, g/m2×24 h ≥1600 ≥1600 ≥1600 ≥1400
Vapor permeability, Sd coefficient, m
Vapor permeability, Sd coefficient, m ≈0.020 ≈0.020 ≈0.020 ≈0.015
Watertightness at 60 kPa for 24 hours
Watertightness at 60 kPa for 24 hours Class W1 Class W1 Class W1 Class W1
UV resistance, months
UV resistance, months ≥3 ≥3 ≥3 ≥2
Length, m
Length, m 50±5% 50±5% 50±5% 50±5%
Width, m
Width, m 1.5±1% 1.5±1% 1.5±1% 1.5±1%