Hello lars vegas,
I would recommend installing a vapor retarder. Although it can be somewhat complex from the outside, it is manageable if the roofer has experience.
It is also possible to build a vapor-permeable roof, but this requires a construction design that ensures the vapor resistance decreases from the interior to the exterior. However, there remains a residual risk because, due to climatic conditions, the pressure conditions in the roof area can sometimes reverse.
I would recommend installing a vapor retarder. Although it can be somewhat complex from the outside, it is manageable if the roofer has experience.
It is also possible to build a vapor-permeable roof, but this requires a construction design that ensures the vapor resistance decreases from the interior to the exterior. However, there remains a residual risk because, due to climatic conditions, the pressure conditions in the roof area can sometimes reverse.
L
lars vegas-110 Apr 2013 15:58Hmm, but there is no vapor barrier shown in the picture. What exactly is supposed to be made airtight in this construction? Should I insist on having a vapor barrier, or is it acceptable as described in the link? I’m confused.
M
MODERATOR10 Apr 2013 17:33Since the manufacturer specifically offers this solution, it can be assumed that this roof structure is and remains free of defects. Because convection from the interior side is not impeded in this way, I must admit it raises some questions for me. According to traditional theory, convection within the roof structure should be prevented.
The manufacturer provides contact information on their website; it is best to call a company technician and describe your project. They can explain most effectively how to apply their product without issues.
The manufacturer provides contact information on their website; it is best to call a company technician and describe your project. They can explain most effectively how to apply their product without issues.
L
lars vegas-111 Apr 2013 08:56I sent them an email. But I also feel the same way: I have some reservations about the construction. I will post the results here. Thanks first of all for your help!
The question arises: why doesn’t the roofer simply use a better above-roof insulation system? For example, there is neodach.de, a system with expanded polystyrene, which can be installed on intact battens, with the roof tiles placed on top. This way, only the airtightness on the surface and at the eaves needs to be considered.
I have had good experience with this myself; I installed such a roof 8 years ago, and everything still fits perfectly today.
I have had good experience with this myself; I installed such a roof 8 years ago, and everything still fits perfectly today.
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