Hello,
last year we renovated our upper floor using a timber frame construction. The wall assembly from inside to outside is as follows:
2 layers of gypsum board
Counter battens / installation space
18mm (0.7 inch) OSB board, tightly glued
200mm (8 inches) mineral wool with a thermal conductivity of 0.035 W/mK between the studs
18mm (0.7 inch) OSB board
My question is whether the outer OSB board might be a potential weak point regarding mold growth—possibly because it is too airtight? If so, how could this issue be addressed?
Perhaps additional external insulation?
Or should it simply be removed again?
I would appreciate any constructive advice.
last year we renovated our upper floor using a timber frame construction. The wall assembly from inside to outside is as follows:
2 layers of gypsum board
Counter battens / installation space
18mm (0.7 inch) OSB board, tightly glued
200mm (8 inches) mineral wool with a thermal conductivity of 0.035 W/mK between the studs
18mm (0.7 inch) OSB board
My question is whether the outer OSB board might be a potential weak point regarding mold growth—possibly because it is too airtight? If so, how could this issue be addressed?
Perhaps additional external insulation?
Or should it simply be removed again?
I would appreciate any constructive advice.
Hello,
basically, you should really have a professional on site calculate the whole thing...
Installing a vapor barrier retrospectively is not exactly cost-effective either. The cladding and installation layer would have to be dismantled again. Besides, there is always a difference between theory and practice. In theory, it might work with a vapor barrier, but who supervises the work and ensures the membrane is installed correctly? I consider this solution to be risky.
The wall’s bracing is most likely provided by the inner OSB board. I would assume that the outer OSB board has no structural function. The wall build-up is incorrect, and I don’t think the structural engineer accounted for it this way.
Cost for a wood fiberboard: I would estimate around 15 to 20 euros per piece (if you install it yourself), but I’m not one hundred percent sure. Your carpenter can probably give you more precise information.
Best regards
basically, you should really have a professional on site calculate the whole thing...
Installing a vapor barrier retrospectively is not exactly cost-effective either. The cladding and installation layer would have to be dismantled again. Besides, there is always a difference between theory and practice. In theory, it might work with a vapor barrier, but who supervises the work and ensures the membrane is installed correctly? I consider this solution to be risky.
The wall’s bracing is most likely provided by the inner OSB board. I would assume that the outer OSB board has no structural function. The wall build-up is incorrect, and I don’t think the structural engineer accounted for it this way.
Cost for a wood fiberboard: I would estimate around 15 to 20 euros per piece (if you install it yourself), but I’m not one hundred percent sure. Your carpenter can probably give you more precise information.
Best regards
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