Hello,
Some background: our construction company built a cold roof (KFW 55 standard). So, there is a vapor barrier and mineral wool insulation. I’m not sure if this is normal, but on the mineral wool beneath the boards (which are vapor-permeable), there are droplets of condensation. Some of the boards look damp and slightly moldy because of this. The construction company advised us against installing OSB boards. They also said we must not add any insulation because “there is no air exchange, and it will only cause problems. We would then lose the warranty. The attic may only be insulated if it is heated and ventilated.” I don’t really understand the last part—is that true? I assumed that the more the entire house including the roof is insulated, the better.
Now I would at least like to insulate one side (the gable wall). I plan to install some shelves there later, so that area will be difficult to access. My question is whether this makes sense if the rest of the roof remains uninsulated? If it just lowers the temperature difference between outside and inside by a few degrees, that’s fine by me. Or does it only make sense if the entire attic is insulated with mineral wool and a vapor barrier?
Is there an expert who could give me some advice?
Thanks in advance!
Some background: our construction company built a cold roof (KFW 55 standard). So, there is a vapor barrier and mineral wool insulation. I’m not sure if this is normal, but on the mineral wool beneath the boards (which are vapor-permeable), there are droplets of condensation. Some of the boards look damp and slightly moldy because of this. The construction company advised us against installing OSB boards. They also said we must not add any insulation because “there is no air exchange, and it will only cause problems. We would then lose the warranty. The attic may only be insulated if it is heated and ventilated.” I don’t really understand the last part—is that true? I assumed that the more the entire house including the roof is insulated, the better.
Now I would at least like to insulate one side (the gable wall). I plan to install some shelves there later, so that area will be difficult to access. My question is whether this makes sense if the rest of the roof remains uninsulated? If it just lowers the temperature difference between outside and inside by a few degrees, that’s fine by me. Or does it only make sense if the entire attic is insulated with mineral wool and a vapor barrier?
Is there an expert who could give me some advice?
Thanks in advance!
bwradar schrieb:
That’s what I thought. I would have dared to insulate it completely; I don’t understand the builder’s resistance with the argument "only if it is heated."
Unfortunately, I have to comply, at least as long as the warranty is still valid. Otherwise, I would lose it. However, I would already question the current condition with condensation and mold buildup—and thereby also the warranty 😉
It might be worth consulting an expert now to assess the situation on-site...
We have already discussed this. The situation was described here:
https://www.hausbafeuchtigkeit-im-dachboden-waerme-kommt-von-der-innenwand
The bricks were insulated with expanding foam.
Another area where the mineral wool gets wet is around the chimney. Nothing has been done there.
https://www.hausbafeuchtigkeit-im-dachboden-waerme-kommt-von-der-innenwand
The bricks were insulated with expanding foam.
Another area where the mineral wool gets wet is around the chimney. Nothing has been done there.
Take a look at the thread from which this quote of one of my posts comes:
Overall, it is about the suitability and upgrading of an attic as a storage room, and specifically in the linked thread by @Nordlys, it is also mentioned that you can basically place a climate-controlled container in your attic.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
11ant schrieb:
Karsten has commented in several similar threads; referring to his own project, the best answer can probably be found here: https://www.hausbau-forum.de/threads/kaltdach-mit-klemmfilz-daemmen-preis.30189/ – but I believe it was less about a “warm” storage room and primarily about a “less temperature-fluctuating” storage space.
Overall, it is about the suitability and upgrading of an attic as a storage room, and specifically in the linked thread by @Nordlys, it is also mentioned that you can basically place a climate-controlled container in your attic.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/