I had a leaking skylight in the upstairs bathroom. A roofer has fixed this now (installed a new sub-flashing, connecting sheets, etc.). Now it's up to me to fix the ceiling myself.
Here you see pictures of how it looked before the demolition. (styrofoam, 12 mm osb and 12 mm plasterboard).
This is how it looks now:
Looks a bit different, the new cassette (is that what it's called?) with black insulation disrupts the geometry a bit (I have 40 mm + 20 mm thickness to play with except near the window where there is only 20 mm).
How would you fix the ceiling?
I'm thinking battens and 40 mm insulation (better wool or styrofoam?) between the battens and then 10 mm osb + 10 mm plasterboard. Am I wrong in my thinking?
Before you build again, you need to install a vapor barrier and come up with a way to connect to the old vapor barrier. Probably, tape is the easiest way.
Without an air gap, there will be holes from each screw.
You can tape against the green tape at the black.
At the bottom against the wall, it may not be so optimal.
How old is the bathroom? Maybe there's no waterproofing on the wall either.
Ok, thanks.
I don't know exactly how the walls look because I haven't needed to tear anything down there. The house was built in 2010, so the bathroom was probably finished around then.
Before you build again, you need to set a vapor barrier and find a way to connect it to the old vapor barrier. Probably tape is the easiest way.
Maybe a dumb question, but should the vapor barrier be between the OSB board and the insulation or between the roof joists and the insulation? Spontaneously, I think you don't want any moist air to penetrate the insulation from the inside, but I'm a bit unsure about how you should really reason with the vapor barrier.
