Expanded a 1930s villa by about 100 square meters. The new part is built in a modern way in every aspect. The old part remains as it was. Right now, we are renovating the bedroom/closet on the upper floor. The ceiling originally consisted of the following from the attic down:
1 sawdust
2 paper
3 boards
4 stretched paper
5 paint
Sometime in the 80s, a 45x45 frame was added to the ceiling (I suspect it was for electrical purposes and some extra insulation in the slanted ceiling area) and paneling.
Now removing the paneling and 45x45. Adding 45x70 to level it, new electrical wiring, and drywall for a smooth and nice ceiling.
The question is, do I need a vapor barrier? The joists are already in the ceiling, is it completely wrong to place the plastic between the drywall and the joists? The room has slanted ceilings in some parts, which would be colder compared to the flat ceiling. Does this affect the need for a vapor barrier? Previously, there was no plastic.
1 sawdust
2 paper
3 boards
4 stretched paper
5 paint
Sometime in the 80s, a 45x45 frame was added to the ceiling (I suspect it was for electrical purposes and some extra insulation in the slanted ceiling area) and paneling.
Now removing the paneling and 45x45. Adding 45x70 to level it, new electrical wiring, and drywall for a smooth and nice ceiling.
The question is, do I need a vapor barrier? The joists are already in the ceiling, is it completely wrong to place the plastic between the drywall and the joists? The room has slanted ceilings in some parts, which would be colder compared to the flat ceiling. Does this affect the need for a vapor barrier? Previously, there was no plastic.
Vapor brake of diffusion-open material, NOT diffusion-tight plastic.