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Häuschen151 Jan 2015 15:13Hello dear forum members!
This forum is really great, and there are many helpful tips. However, we have a specific situation and can’t find anything relevant for our question. That’s why I’m reaching out to you now, hoping someone can help us.
We are building a house, and the shell was completed in mid-November. The windows were installed, and the roof was covered. We are doing a lot of the work ourselves and have started the interior finishing in recent weeks. We now plan to insulate the roof within the next few days. Our problem is that the underlay membrane is damp, and some of the rafters are also moist. In recent days, the temperatures have been very low, and the membrane was frozen solid. We set up some small heaters, so nothing is frozen anymore, but it is still damp.
We are not at all sure whether this is an issue or if it’s okay and will dry out over time. If we place the insulation wool between the rafters, there will be no airflow there, and we are worried it could cause mold since the vapor barrier on the interior side seals everything.
I hope someone knowledgeable about this topic can assist us. If you need any additional information, just let me know.
Thank you very much in advance for your help.
Malu
This forum is really great, and there are many helpful tips. However, we have a specific situation and can’t find anything relevant for our question. That’s why I’m reaching out to you now, hoping someone can help us.
We are building a house, and the shell was completed in mid-November. The windows were installed, and the roof was covered. We are doing a lot of the work ourselves and have started the interior finishing in recent weeks. We now plan to insulate the roof within the next few days. Our problem is that the underlay membrane is damp, and some of the rafters are also moist. In recent days, the temperatures have been very low, and the membrane was frozen solid. We set up some small heaters, so nothing is frozen anymore, but it is still damp.
We are not at all sure whether this is an issue or if it’s okay and will dry out over time. If we place the insulation wool between the rafters, there will be no airflow there, and we are worried it could cause mold since the vapor barrier on the interior side seals everything.
I hope someone knowledgeable about this topic can assist us. If you need any additional information, just let me know.
Thank you very much in advance for your help.
Malu
schubert791 Jan 2015 15:57Please do not insulate when it is damp. You have already made the right considerations regarding mold and similar issues.
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Häuschen151 Jan 2015 16:43Hello Schubert,
thank you for the quick reply. So, you recommend waiting until it is completely dry? That could take quite some time, right?
thank you for the quick reply. So, you recommend waiting until it is completely dry? That could take quite some time, right?
A small general tip to prevent future moisture buildup under the vapor-permeable membrane: In Denmark, so-called roof membrane vents are mandatory in new house construction. These are integrated into the vapor-permeable membrane and provide ventilation between the membrane and the insulation.
Two of my clients use these on every build after experiencing complaints once...
Two of my clients use these on every build after experiencing complaints once...
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