parcus
2021-01-16 12:55:24
- #1
First of all, I have not read further here.
As it looks, the top ceiling is the end of the building envelope with the mineral wool insulation. (Otherwise pointless)
Consequently, the vapor barrier would be found below the ceiling and not on the roof. Which would rather be an underlay membrane.
However, this seems to be "airtight" at the verge and ridge, i.e. there is no air circulation possible under the underlay membrane.
At the coldest spots, often component connection corners/rafters, the underlay membrane would consequently have to get wet.
How is the roof space continuously ventilated?
As it looks, the top ceiling is the end of the building envelope with the mineral wool insulation. (Otherwise pointless)
Consequently, the vapor barrier would be found below the ceiling and not on the roof. Which would rather be an underlay membrane.
However, this seems to be "airtight" at the verge and ridge, i.e. there is no air circulation possible under the underlay membrane.
At the coldest spots, often component connection corners/rafters, the underlay membrane would consequently have to get wet.
How is the roof space continuously ventilated?