Vapour Barrier/Diffusion Barrier Installed Incorrectly?

[svenbe]

I have searched through countless threads here looking for an answer to my question, but without success.
A house built in '95, where the vapor barrier is placed as follows:

13mm plasterboard + 145mm insulation between 45x145 studs + vapor barrier 0.2mm + 45mm insulation + 9mm gnu board + 80 mm mineral wool...

This suggests that it is placed too far out in the wall? Some people I've talked to say that it was done this way before and it has worked. My ambition is to tear down the plasterboard from the inside and fix it, what are your thoughts?

 

[hul]

I don't understand how you are supposed to fix this from the inside? explain, or is it me who is thinking wrong?

 

[svenbe]

By taking down the plaster with the insulation, cut down the vapor barrier. Add new insulation, apply a new vapor barrier. Frame with 45x45 and then new plasterboard.
You probably have to remove some plaster from the ceiling so you can access the vapor barrier from the ceiling and connect them.

 

[hul]

then I'm with you.

understood it as if you would take down the drywall to the plastic and put it back with drywall again.
you can always make a hole in one place all the way to the existing plastic and feel with your hand if it's damp

 

[svenbe]

Yes, I have done that but no indication of moisture. But then the question is whether it has come from somewhere else etc. etc. That's why I'm wondering if anyone else has experience with this construction?