Insulation outside vapor barrier?

[Pontus Baronen Bjarnmark]

Hello
I am working on an extension of 50 sqm. According to my construction drawing, I should have insulation outside the vapor barrier! So

Raw plank
Air gap
195 insulation
Vapor barrier
70 insulation
Sparse panel
Gypsum

Is there no risk that the condensation stays in the insulation?
I am attaching a picture. Thank you in advance

 

[KnockOnWood]

The rule of thumb is that the vapor barrier should be a maximum of 1/3 into the wall, to avoid ending up on the wrong side of the dew point.

So you should be on the safe side.

 

[Stefan1972]

No, as long as the vapor barrier is tight, the air does not move, and no condensation can occur. Construction is done like that nowadays to achieve an unbroken vapor barrier, and then you get an additional 45mm where you can place electrical wiring and such. This avoids puncturing the vapor barrier with lots of sockets and so on.

 

[Pontus Baronen Bjarnmark]

Thanks for the response! I read that too, but then I also read on several pages that the plastic should always be on the outer side against the insulation from the warm side😬 so I got a bit worried! But then it should work!

 

[Pontus Baronen Bjarnmark]

Okay! I thought this way seemed easiest myself because now I have no problems with the electrical wiring and just like you said, I don't puncture the vapor barrier! Thanks for the answer.

 

[Joh_81]

Since you have sparse paneling between the horizontal studs and the gypsum, you can place the plastic on the inside of all the insulation.
28 mm sparse paneling is sufficient as installation space. This way, you also avoid cutting the insulation around all pipes/hoses and outlets.