How do you install the vapor barrier in inaccessible areas?

  • Erstellt am 2024-10-07 19:24:47

handwerk97

2024-10-07 19:24:47
  • #1
Hello everyone,

now that the beam bearing is free, I can install the vapor barrier. The installation will be done almost over the entire beam bearing of the upper floor ceiling.

Unfortunately, there are a few spots (about 5 cm gap between the wall and the rafters) where access is very difficult. Additionally, there are nails hidden behind, which makes installing the vapor barrier challenging.

My thought was to leave these areas free of insulation and simply lay the foil over the beam edge towards the wall. Basically, so that the inaccessible area is only filled with air.

Is that possible, or can too much air between the foil and the ceiling/rafters cause moisture damage?
The rafters will be fitted with 0.32 density, 180 mm insulation wool and diffusion-open wood fiberboards with 80 or 100 mm above that. Finally, diffusion-open boards as the covering.
 

Tolentino

2024-10-07 19:30:15
  • #2
I would foam the areas and then stick the foil over them.
 

handwerk97

2024-10-09 16:09:21
  • #3
Ok that sounds like a solution. Then I will look for a suitable foam.
 
Oben