Hello,
I will try to get straight to the point.
Can someone briefly explain the differences between what I would call "prefabricated wooden houses," like Scanhaus Marlow, Danwood, Massahaus, etc., and wooden houses from networks like 81fünf that promote traditional carpentry companies from the local region?
What are the advantages and disadvantages?
Thank you very much.
I will try to get straight to the point.
Can someone briefly explain the differences between what I would call "prefabricated wooden houses," like Scanhaus Marlow, Danwood, Massahaus, etc., and wooden houses from networks like 81fünf that promote traditional carpentry companies from the local region?
What are the advantages and disadvantages?
Thank you very much.
N
nordanney17 Aug 2020 21:29joschua_85 schrieb:
Polystyrene, all kinds of foil, etc., inside and on the walls.You won’t be able to completely avoid using vapor barriers (at the latest on the roof). Otherwise, cellulose insulation, mineral wool, hemp, flax, wood fiber boards, and others. In timber frame construction, achieving KfW 40 energy efficiency is one of the easiest tasks. It is difficult not to reach at least 55.
In solid construction, there are also alternatives to polystyrene: phenolic resin insulation, mineral wool, ventilated and suspended wooden facades with appropriate insulation, monolithic designs. It’s just more challenging than in timber frame construction.
J
joschua_8518 Aug 2020 19:18Just saying, the guy explains it in a really friendly and clear way. This is exactly how our carpentry would build it.
[MEDIA=youtube]GA8liPBdC8g[/MEDIA]
[MEDIA=youtube]GA8liPBdC8g[/MEDIA]
K
knalltüte18 Aug 2020 22:08Hi,
our KfW40 house is being built almost entirely without plastic (more precisely: synthetic materials).
Even under the roof, no membrane is planned. The airtight layer is formed by the 10cm (4 inch) solid wood wall (cross-laminated timber).
On the outside, there is an 8cm (3 inch) wood fiber insulation board serving as a base for plaster. Behind that, there is currently 20cm (8 inch) of mineral wool insulation (which essentially uses glass as a raw material). We are currently having the builder calculate whether blown-in insulation, as originally planned, could still work. The architect initially specified mineral wool because my living units are quite small, resulting in an unfavorable room-to-surface ratio. However, the head of the construction company is concerned about this and persistently working on it in a positive way. If it is approved by the calculations and remains affordable, it will make the building even more ecological.
For the roof structure, we are using OSB4 boards (which contain more adhesive compared to OSB3, making them airtight).
Of course, there will be some tape used to seal openings and pipes, but no entire layer made of plastic.
Under the foundation slab, it was not possible to avoid XPS for cost reasons. The alternative, glass foam gravel, would have been disproportionately expensive.
our KfW40 house is being built almost entirely without plastic (more precisely: synthetic materials).
Even under the roof, no membrane is planned. The airtight layer is formed by the 10cm (4 inch) solid wood wall (cross-laminated timber).
On the outside, there is an 8cm (3 inch) wood fiber insulation board serving as a base for plaster. Behind that, there is currently 20cm (8 inch) of mineral wool insulation (which essentially uses glass as a raw material). We are currently having the builder calculate whether blown-in insulation, as originally planned, could still work. The architect initially specified mineral wool because my living units are quite small, resulting in an unfavorable room-to-surface ratio. However, the head of the construction company is concerned about this and persistently working on it in a positive way. If it is approved by the calculations and remains affordable, it will make the building even more ecological.
For the roof structure, we are using OSB4 boards (which contain more adhesive compared to OSB3, making them airtight).
Of course, there will be some tape used to seal openings and pipes, but no entire layer made of plastic.
Under the foundation slab, it was not possible to avoid XPS for cost reasons. The alternative, glass foam gravel, would have been disproportionately expensive.
J
joschua_8524 Aug 2020 23:12A quick note about your OSB panels. Over the weekend, we visited a prefabricated house center for the first time in a while, just to gather some floor plan ideas.
There, we came across an architectural firm that builds with solid wood walls® using air grooves—completely without glue or adhesives.
I have to admit, I might be a bit susceptible to controlled uncertainty.
But they even criticized the timber frame construction from the video above because of the glue in the OSB panels, saying you might as well use polystyrene instead.
Also, the mechanical ventilation system in their show home was reportedly switched off after two years due to "hygiene" concerns. They basically called it unnecessary.
Price-wise, this is probably in a completely different league, so I didn’t look into it further.
However, the whole ventilation issue still bothers me. Something I have considered during the planning phase for a Ytong construction (aerated concrete) might be a solution for my conscience and budget = window rebate vents everywhere plus decentralized exhaust (or just bathroom fans?) in the bathroom, guest toilet, and utility room.
The advantage I see is that at least some air could circulate, and it could easily be dismantled or deactivated if it turns out to be unnecessary, which I assume. Because if I have a central or decentralized system costing a lot, I will lose my mind at the slightest fan noise or draft—I just don’t like that. And then running it at level 1 just for background noise—that should also be manageable with the number of window rebate vents, right!?
This is just my guess; feel free to criticize or advise.
Thank you very much
There, we came across an architectural firm that builds with solid wood walls® using air grooves—completely without glue or adhesives.
I have to admit, I might be a bit susceptible to controlled uncertainty.
But they even criticized the timber frame construction from the video above because of the glue in the OSB panels, saying you might as well use polystyrene instead.
Also, the mechanical ventilation system in their show home was reportedly switched off after two years due to "hygiene" concerns. They basically called it unnecessary.
Price-wise, this is probably in a completely different league, so I didn’t look into it further.
However, the whole ventilation issue still bothers me. Something I have considered during the planning phase for a Ytong construction (aerated concrete) might be a solution for my conscience and budget = window rebate vents everywhere plus decentralized exhaust (or just bathroom fans?) in the bathroom, guest toilet, and utility room.
The advantage I see is that at least some air could circulate, and it could easily be dismantled or deactivated if it turns out to be unnecessary, which I assume. Because if I have a central or decentralized system costing a lot, I will lose my mind at the slightest fan noise or draft—I just don’t like that. And then running it at level 1 just for background noise—that should also be manageable with the number of window rebate vents, right!?
This is just my guess; feel free to criticize or advise.
Thank you very much
D
Daniel-Sp25 Aug 2020 00:33Again, timber frame construction can be done without OSB in the wall structure....
J
joschua_8525 Aug 2020 07:12But I hardly believe that I can or am allowed to tell any carpentry company what they have to install.
For all of them, it’s probably more like either this way or we leave it, which I can understand. But what would be your alternative?
I just wanted to point out how other general contractors see it. Whether and how we want to proceed with the whole thing is still (almost) completely open.
For all of them, it’s probably more like either this way or we leave it, which I can understand. But what would be your alternative?
I just wanted to point out how other general contractors see it. Whether and how we want to proceed with the whole thing is still (almost) completely open.
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