Hello...
In our house, we have insulated the space between the rafters all the way up to the ridge, and the intermediate ceiling between the upper floor and the attic is also insulated. The vapor barrier is installed along the roof slopes on the upper floor and then continues along the intermediate ceiling. In other words, there is no vapor barrier in the attic (the insulation between the rafters is currently exposed)…
Now we want to cover the attic so you don’t keep brushing against the insulation with your clothes. Can I install 12mm (0.47 inch) OSB boards or tongue-and-groove boards directly? Or should or must a vapor barrier also be installed there (which would then be applied between the ceiling joists/collars, extended downwards and connected to the vapor barrier of the intermediate ceiling)?
It is not planned to be used as living space at the moment; besides, the technical unit for ventilation is installed up there. Otherwise, it will be used as storage space…
Greetings
In our house, we have insulated the space between the rafters all the way up to the ridge, and the intermediate ceiling between the upper floor and the attic is also insulated. The vapor barrier is installed along the roof slopes on the upper floor and then continues along the intermediate ceiling. In other words, there is no vapor barrier in the attic (the insulation between the rafters is currently exposed)…
Now we want to cover the attic so you don’t keep brushing against the insulation with your clothes. Can I install 12mm (0.47 inch) OSB boards or tongue-and-groove boards directly? Or should or must a vapor barrier also be installed there (which would then be applied between the ceiling joists/collars, extended downwards and connected to the vapor barrier of the intermediate ceiling)?
It is not planned to be used as living space at the moment; besides, the technical unit for ventilation is installed up there. Otherwise, it will be used as storage space…
Greetings
D
Doc.Schnaggls22 Dec 2014 10:50Hello,
just a quick question upfront: Do you regularly ventilate your attic (daily), or if the central ventilation unit is installed up there, do you ventilate the attic automatically together with it?
If not, I’m concerned that with the insulation in the attic, you might end up with serious mold problems caused by condensation.
We had also considered insulating the attic completely up to the ridge in addition to the ceiling insulation (mineral wool and vapor retarder). However, for the reasons mentioned above, both the house manufacturer and several friends (tradespeople) strongly advised against it.
Without this insulation and vapor retarder, our ventilation roof tiles are now working perfectly, and the attic always has pleasantly fresh air.
Regards,
Dirk
just a quick question upfront: Do you regularly ventilate your attic (daily), or if the central ventilation unit is installed up there, do you ventilate the attic automatically together with it?
If not, I’m concerned that with the insulation in the attic, you might end up with serious mold problems caused by condensation.
We had also considered insulating the attic completely up to the ridge in addition to the ceiling insulation (mineral wool and vapor retarder). However, for the reasons mentioned above, both the house manufacturer and several friends (tradespeople) strongly advised against it.
Without this insulation and vapor retarder, our ventilation roof tiles are now working perfectly, and the attic always has pleasantly fresh air.
Regards,
Dirk
Do you mean mold in the insulation or between the insulation and the underlay membrane? Or between the insulation and the future interior cladding?
Yes, the ventilation system now also includes the attic (initially it didn’t, but it was changed after a few months, which surprised me because, on the one hand, the system has to be installed in a frost-free location (I don’t know why, since it is right against the gable wall and draws in the freezing outside air, so a certain part of the device is cold from the inside anyway). I can only imagine that the device itself isn’t sufficiently insulated to operate solely on the “waste heat” from the indoor air, or that the efficiency decreases...) and therefore a ventilated attic with roof vents would not be feasible...
However, I don’t know if the ventilation up there is working as it should, since the system is placed on the floor and the air isn’t being extracted at the very top, for example.
Yes, the ventilation system now also includes the attic (initially it didn’t, but it was changed after a few months, which surprised me because, on the one hand, the system has to be installed in a frost-free location (I don’t know why, since it is right against the gable wall and draws in the freezing outside air, so a certain part of the device is cold from the inside anyway). I can only imagine that the device itself isn’t sufficiently insulated to operate solely on the “waste heat” from the indoor air, or that the efficiency decreases...) and therefore a ventilated attic with roof vents would not be feasible...
However, I don’t know if the ventilation up there is working as it should, since the system is placed on the floor and the air isn’t being extracted at the very top, for example.
D
Doc.Schnaggls22 Dec 2014 14:09We were warned about mold forming on any surface if we fully insulated the attic and then did not ventilate regularly. Essentially, anywhere condensation could settle.
I’m not a ventilation system expert, but since our mechanical ventilation system either extracts air from the ceiling or from the wall just below the ceiling, it might be a good idea to relocate the exhaust point higher up...
Best regards,
Dirk
I’m not a ventilation system expert, but since our mechanical ventilation system either extracts air from the ceiling or from the wall just below the ceiling, it might be a good idea to relocate the exhaust point higher up...
Best regards,
Dirk
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