Here is a study regarding ånspärren.
http://du.diva-portal.org/smash/get/diva2:732034/FULLTEXT01.pdf
Now it should be added that I have spoken with Henrik Janols who was the Thesis Supervisor for this test, similarly it has emerged that a significant part was not represented in this study, which is wallpaper and wallpaper paste, which have a very large impact on moisture permeability according to Henrik. They will conduct a new study/test where the walls will be wallpapered/painted to see what the effects are then. The tests that everyone seems to refer to are not reality-based but just a look at how water vapor affects sheet material but they have nothing to do with reality.
So much for evidence
http://du.diva-portal.org/smash/get/diva2:732034/FULLTEXT01.pdf
Now it should be added that I have spoken with Henrik Janols who was the Thesis Supervisor for this test, similarly it has emerged that a significant part was not represented in this study, which is wallpaper and wallpaper paste, which have a very large impact on moisture permeability according to Henrik. They will conduct a new study/test where the walls will be wallpapered/painted to see what the effects are then. The tests that everyone seems to refer to are not reality-based but just a look at how water vapor affects sheet material but they have nothing to do with reality.
So much for evidence