Revisions log for question
What vapor barrier option to choose for the roof?
Revision 1
2022‑10‑08 08:20
Active REV1
Initial text
We would like to build a wooden frame house in a vapor permeable construction. Now we have a proposal with different options for roof construction or vapor barrier performance. Can anyone here give an assessment of the advantages/disadvantages?
-roofing shingles.
-8 cm purlins / counter purlins
-7 cm soft fibreboards
— 20 cm rafters with wood-fiber insulation
-foil insulation
-grids / counter grids
-gypsum board
-wallpaper/plasterboard
This is a construction in an occupied attic. In the attic, OSB is used as a vapor barrier for the brake itself, stiffening and sheathing.
As an alternative for the residential attic, I have been offered a heavy paper/cardboard vapor barrier with fabric (Pro Clima) or OSB boards. What should I think of this?