VARIABLE-HUMIDITY DIRECTIONAL VAPOUR BARRIER

摘要

The present invention relates to a variable-humidity directional vapour barrier which comprises at least two layers, wherein one layer (layer 1) is humidity-variable and the other layer (layer 2) is humidity-independent. For layer 1, the quotient for the water vapour diffusion resistance from the sd value at 25% mean relative air humidity to the sd value at 71.5% mean relative air humidity is greater than 3. For layer 2, the quotient for the water vapour diffusion resistance from the sd value at 25% mean relative air humidity to the sd value at 71.5% mean relative air humidity is less than 1.5. Furthermore, the invention relates to the use of the vapour barrier for sealing buildings and to a system which comprises said vapour barrier. Furthermore, the invention relates to the use of a certain film for sealing a space in buildings which is closed by an exterior skin, wherein the film comprises defined film sides X and Y or layers 1 and 2 and is arranged in a certain way.

主权项

1. Use of a film for sealing a space closed by an outer skin in buildings, wherein the film has a film side X and an opposite film side Y and the film is arranged such that the film side X is aligned with the outer skin, wherein the film sides X and Y are defined such that the water vapor diffusion from film side X to film side Y is greater than the water vapor diffusion from film side Y to film side X, with the proviso that in the experimental set-up according to DIN EN ISO 12572:2001 condition B (85% RH to 0% RH; 23° C.), film side X is aligned with the side of higher relative air humidity, whereby a greater water vapor diffusion can be measured than when at the same measurement, film side Y faces the side of higher relative air humidity.