Do I need an air gap with a vapor barrier?

[lallaren]

I have bought Isolina vapor barrier, a paper that is marketed as diffusion-open.

Do I need to have an air gap between the glass wool and the vapor barrier, or does it matter less? The point is that the paper should be able to vent moisture out anyway, right?

What does the expert panel here on the forum say?

 

[Håbbe01]

The air gap should as usual be inside the facade and wind board. This paper is on the warm side, so the answer is no

 

[guggen]

An air gap is on the outside, inside the outer panel, and especially if you have large amounts of insulation and want to paint with plastic paint, which is the norm these days. Isolina's paper barrier is normally used for hygroscopic insulation, such as isolina's flax or some wood fiber. What is the idea of using it for fiberglass insulation?

 

[lallaren]

According to säkervatten, you should have a ångbroms, so I bought a ångbroms. Did I do something wrong now??!!

 

[lallaren]

The air gap should, as usual, be inside the facade and the windboard. This paper is on the warm side so, answer no

Okay! Thanks for the simple and clear answer.