Hello everyone,
We have a tent roof with the following structure:
- Tiles
- Underlay membrane
- Insulation
- Vapor barrier
Originally, a vapor-permeable vapor barrier was supposed to be used, but the site manager mentioned that in his last training, for our roof type, a standard vapor barrier, meaning not vapor-permeable, was recommended.
What is your opinion? Are there any reasons why a vapor-permeable vapor barrier should not be used?
Thanks in advance.
We have a tent roof with the following structure:
- Tiles
- Underlay membrane
- Insulation
- Vapor barrier
Originally, a vapor-permeable vapor barrier was supposed to be used, but the site manager mentioned that in his last training, for our roof type, a standard vapor barrier, meaning not vapor-permeable, was recommended.
What is your opinion? Are there any reasons why a vapor-permeable vapor barrier should not be used?
Thanks in advance.
Vapor retarders (climate membranes) are more forgiving of installation or construction errors than vapor barriers. Therefore, it is generally better to choose them. The additional costs are actually negligible, around 100-200€.
The site manager’s seminar was probably focused on cost savings, which is why vapor barriers were recommended.
The site manager’s seminar was probably focused on cost savings, which is why vapor barriers were recommended.
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pffreestyler24 Feb 2020 14:24@Nordlys I’ve been wondering this several times looking at your photos: why is the bare membrane visible around an existing window? I always thought that these membranes only withstand UV light for a limited time. Shouldn’t there be at least some protection like drywall or similar installed in the window area?
My cousin left his open for 6 years. The membrane became so fragile that just touching it was enough to tear a hole in it. However, it wasn’t a climate membrane but just a basic vapor barrier.
My cousin left his open for 6 years. The membrane became so fragile that just touching it was enough to tear a hole in it. However, it wasn’t a climate membrane but just a basic vapor barrier.
As already mentioned, the issue has nothing to do with the costs.
Bookstar schrieb:Bookstar also wrote that a vapor retarder would be incorrect and that if anything, a climate membrane would make sense.
A standard vapor retarder would be wrong! It has a fixed sd value of 2, which could be insufficient in some cases, and your insulation might get wet.
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