Transition from vapor barrier in exterior wall to waterproofing in bathroom?

[claes_g84]

Hi!

I am building a vacation home and have started on insulation and vapor barrier in the ceiling (for practical reasons, I am starting with the ceiling).
The walls will be the next step, and I am wondering how to typically handle the transition of the vapor barrier in the walls to the bathroom's waterproofing layer?

In the attached image, the vapor barrier will extend 45mm into the outer wall, indicated by RED, and will end at the bathroom where the color changes to BLUE.
In the bathroom wall, there should not be double waterproofing, but how do you effectively seal the transition to ensure it is waterproof?
Should I extend the vapor barrier slightly into the bathroom wall or what is the typical approach?

Best regards, Claes

 

[hul]

Hello!

I'm building a vacation home and have started insulation and vapor barrier in the ceiling (for practical reasons, I start with the ceiling). The walls will be the next step, and I'm wondering how to normally solve the transition of the vapor barrier in the walls to the bathroom's waterproofing?

In the attached image, the vapor barrier in the RED 45mm comes into the outer wall and ends at the bathroom where the color changes to BLUE. In the bathroom wall, there shouldn't be double waterproofing, but how do you handle the transition well so it becomes tight? Should I extend the vapor barrier a bit into the bathroom wall, or how is it normally done?

Best regards, Claes

IF you're doing it super professionally, the vapor barrier should end at the waterproofing and be folded out on the wall, but that is almost never done.

The easiest is to set the vapor barrier as usual, that is, completely bypass the bathroom. Then just make a slit with the knife in the plastic where the bathroom will be. You can tape it to the waterproofing too if you like.

 

[claes_g84]

If you want to do it super professionally, the vapor barrier should end at the waterproofing layer and fold out onto the wall, but that's hardly ever done.

The easiest way is to set the vapor barrier as usual, that is, bypass the bathroom completely.
Then just make a cut with the knife in the plastic where the bathroom will be.
Then you can tape it to the waterproofing if you want as well.

Thanks for the input!

I actually remembered after I wrote the post that I have a KA to call upon in situations like this!
My KA gave the same answer as you, I either bypass the inner wall a bit where the waterproofing begins in the bathroom or, as you say, super professionally fold it onto the wall against the waterproofing and tape the vapor barrier to the inner wall.

As a DIY builder, you can easily turn such considerations into bigger problems than they actually are

 

[hul]

Great, then it resolved itself, but choose the simple option