No vapor barrier in wet room?

[Draven]

Shouldn't one have a vapor/diffusion barrier in the wet room because the waterproofing layers you will have act as one instead?

We are planning to have a tiled bathroom, and one wall is an exterior wall, so I shouldn’t have a vapor barrier there? Just drywall, waterproofing, then adhesive and tiles?

Then in the ceiling, can I keep the vapor barrier there? Planning to have a beadboard ceiling there.

 

[AndersG]

You should not have double barriers, so on the walls that have a moisture barrier you should not have a vapor barrier (film)

See e.g.:
http://www.byfy.lth.se/Publikationer/Other/TVBH-7226.pdf

 

[Draven]

You should not have double barriers, so on walls that have waterproofing you should not have a vapor barrier (film)

See for example:
[link]

Ok good, now I know this. Thanks

 

[AndersG]

No problem We did build prefabricated houses and there the elements meant for wet rooms were clearly marked "Saknar fuktspärr". The thing about moisture barriers can be a bit tricky, as double barriers, without ventilation in between, can be very bad.