SIKA Index Vapordiffuser V 4kg Roll | WPD Group

Vapordiffuser/V is an APP modified bituminous roof membrane, torch applied, flexible at -10 °C and reinforced with a glass fleece. The underside has thicker knobs with 3,5 - 4 mm, which covers almost 35% of the surface and allow the diffusion of the remaining moisture of the surface. To ensure the application, the underside has a polyethylene burn-off film. This semi-adhesion is also used to distribute and soften mechanical strain on the laying surface. It can be applied on concrete substrates and over existing bitumen roofing membranes. Weight: 2,0 kg/m2.


Roof waterproofing membrane for:

  • Flat and slope roofs under protective layers or ballast
  • Balconies and terraces under tiles
  • As a first layer on all damp surfaces


  • Great resistance to the wind;
  • Vapor diffuser and waterproof on the same membrane;
  • Distributes the movement across the laying surface;
  • Good cold flexibility;
  • Good mechanical properties (tensile, tear, shear);
  • Easy to install by torching method;
  • Choice of primers to suit substrate and weather conditions


SIKA Index Vapordiffuser V PDS