ᐅ What happens to the air when it reaches the warm vapor barrier?

Hello,

what actually happens when the warm air reaches the vapor barrier but does not condense there due to sufficiently high temperatures? Something must happen to it because it is, after all, moisture in the air.

Second question:

What if the insulation is installed damp or becomes somewhat damp during a winter or similar period, and then the vapor barrier is applied in front of it? What happens then? Many people must deal with such problems, right?

The question is specifically about our planned wall construction (from inside to outside):

1. Gypsum board
2. OSB board
3. 6cm (2.4 inches) installation cavity with mineral wool insulation
4. Vapor barrier
5. 20cm (7.9 inches) mineral wool insulation
6. Wind barrier membrane (breathable)
7. 1.5cm (0.6 inches) air gap
8. 7cm (2.8 inches) log panel

Thank you very much 🙂

Nothing happens at all. That is precisely why the dew point is calculated during the construction build-up. If the build-up is correct, no condensation occurs within the structure, or so little that it can dry out without causing any damage.

Regards