world-e
2017-04-21 13:01:15
- #1
Hello everyone,
for my basement (24cm thick WU concrete plus 12cm perimeter insulation) I would like to clad the exterior walls in one room with Fermacell composite boards (1cm Fermacell on 3cm Styrofoam) in order to accommodate some electrical installation there as well. The interior walls are masonry and will be plastered as usual. The concrete walls should, if possible, not be plastered; instead of plaster, the Fermacell boards are to be installed. Most of the electrical installation is also located in the interior walls. It is only in one room, which has a light well and is intended to be used as a hobby or guest room. That is why this room should also be "nicer" than the other basement rooms. The construction manager did not want to install the electrical installation in the WU concrete, probably because he did not want boxes nailed to his formwork and it also has something to do with tightness.
My concerns are as follows:
Can condensation occur with the build-up without a vapor barrier? According to the U-value calculator, the build-up should work, especially since there is 12cm insulation on the outside. Or do you have other ideas? I would prefer not to do the electrical installation on plaster. The composite boards seem simpler to me than first building a substructure and then cladding with gypsum fiberboard. Otherwise, the two exterior walls would also have to be plastered or at least sanded and filled.
Thank you very much
for my basement (24cm thick WU concrete plus 12cm perimeter insulation) I would like to clad the exterior walls in one room with Fermacell composite boards (1cm Fermacell on 3cm Styrofoam) in order to accommodate some electrical installation there as well. The interior walls are masonry and will be plastered as usual. The concrete walls should, if possible, not be plastered; instead of plaster, the Fermacell boards are to be installed. Most of the electrical installation is also located in the interior walls. It is only in one room, which has a light well and is intended to be used as a hobby or guest room. That is why this room should also be "nicer" than the other basement rooms. The construction manager did not want to install the electrical installation in the WU concrete, probably because he did not want boxes nailed to his formwork and it also has something to do with tightness.
My concerns are as follows:
Can condensation occur with the build-up without a vapor barrier? According to the U-value calculator, the build-up should work, especially since there is 12cm insulation on the outside. Or do you have other ideas? I would prefer not to do the electrical installation on plaster. The composite boards seem simpler to me than first building a substructure and then cladding with gypsum fiberboard. Otherwise, the two exterior walls would also have to be plastered or at least sanded and filled.
Thank you very much