ᐅ External insulation using wood fiber boards installed over OSB panels
Created on: 16 Feb 2022 05:19
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Baupfusch0815B
Baupfusch081516 Feb 2022 05:19Hello everyone.
I need some advice.
We have renovated an old house.
We removed the entire upper floor and rebuilt it using a timber frame construction. Insulation wool was installed between the beams.
For the exterior, I wanted to have the insulation and plastering done by a professional company.
They wanted me to cover the outside of the timber frame with OSB boards first.
Now, they were supposed to insulate and plaster, but the person responsible from the company said he doesn’t understand why the OSB is there. He said he can’t attach wood fiber boards onto it.
We have now obtained a second opinion, and they said we should remove the OSB boards. The window sills and shutters are already installed.
I’m not sure if I can remove the boards, as they were nailed in.
So my question is:
Can I leave the OSB boards in place, and is it possible to apply insulation on top of them so that plastering can be done?
I need some advice.
We have renovated an old house.
We removed the entire upper floor and rebuilt it using a timber frame construction. Insulation wool was installed between the beams.
For the exterior, I wanted to have the insulation and plastering done by a professional company.
They wanted me to cover the outside of the timber frame with OSB boards first.
Now, they were supposed to insulate and plaster, but the person responsible from the company said he doesn’t understand why the OSB is there. He said he can’t attach wood fiber boards onto it.
We have now obtained a second opinion, and they said we should remove the OSB boards. The window sills and shutters are already installed.
I’m not sure if I can remove the boards, as they were nailed in.
So my question is:
Can I leave the OSB boards in place, and is it possible to apply insulation on top of them so that plastering can be done?
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Baupfusch081516 Feb 2022 10:26Attached is a photo of the house. This shows the current status.
Baupfusch0815 schrieb:
Now they should insulate and plaster, but the person from the company responsible asked why there is OSB on it. He said that wood fiber boards can’t be attached to that. He should explain a) why not and b) how he plans to fix the boards. If he wants to glue them and finds the wood too smooth, there are primers available to pre-treat the surface. Removing the OSB panels again would be nonsense.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
They probably *could* do it, but it’s not common practice. Most likely, this is because the installed OSB is vapor-tight. Usually, the wood fiber insulation boards are installed directly onto the rafters. Between the rafters there is insulation, and BELOW THAT a vapor-tight layer. If wood fiber insulation boards are placed on top of the OSB (is there insulation below the OSB?), moisture will accumulate in the wrong place, which can lead to mold and other serious problems. Since this involves a professional company, they would even be liable for consequential damage, even if you sign off that they should install it this way. Of course, this is just my “layman’s opinion,” as always without any guarantee.
Bottom line: Remove the OSB in good weather, then immediately install the wood fiber insulation boards on the rafters. Alternatively, make the OSB vapor-permeable (or there may be another reason for this → ask).
Why did this happen in the first place? Probably due to a lack of communication between the client and the contractor!
Bottom line: Remove the OSB in good weather, then immediately install the wood fiber insulation boards on the rafters. Alternatively, make the OSB vapor-permeable (or there may be another reason for this → ask).
Why did this happen in the first place? Probably due to a lack of communication between the client and the contractor!
i_b_n_a_n schrieb:
Usually, wood fiber insulation boards are installed directly on the rafters. Between the rafters is insulation, and BELOW THAT is the vapor-tight layer. Now, if wood fiber insulation boards are placed on the OSB (is there insulation below the OSB?) What do you mean by "rafters" and "below"? – we are not talking about a roof, but an exterior wall.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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