A house provider places particular emphasis on a vapor-permeable wall construction in their house descriptions. This is one of the main reasons why the provider does not install a central ventilation system. Another reason is that biomass (small dust particles, etc. in the air) can be drawn into the duct system, which can quickly lead to contamination (mold growth) within the distribution system.
I have two issues with this.
1. We generally wanted a ventilation system, but the provider does not install one at all.
2. We are now unsure how effective this vapor-permeable wall construction really is and whether it might be reasonable to forgo the ventilation system because of it.
Here is a brief outline of the wall construction (Swedish house facade) from inside to outside:
15 mm (0.6 inches) high-quality Fermacell solid construction panels
40 mm (1.6 inches) timber frame structure with Knauf Insulation, 40 mm (1.6 inches), thermal conductivity class 040
0.2 mm (0.008 inches) vapor retarder, diffusion equivalent air layer (Sd) 100 m (328 feet)
160 mm (6.3 inches) timber frame structure with Knauf Insulation, 160 mm (6.3 inches), thermal conductivity class 040
30 mm (1.2 inches) wood fiber insulation board
24 mm (0.9 inches) battens
Approx. 20 mm (0.8 inches) SL boarding, spruce (color according to color chart)
It would be very helpful if someone could explain the advantages of this vapor-permeable wall construction compared to other timber frame walls. The relationship to the ventilation system is especially important for us. With Hagemann Haus, we would have to forego this ventilation system altogether.
I have two issues with this.
1. We generally wanted a ventilation system, but the provider does not install one at all.
2. We are now unsure how effective this vapor-permeable wall construction really is and whether it might be reasonable to forgo the ventilation system because of it.
Here is a brief outline of the wall construction (Swedish house facade) from inside to outside:
15 mm (0.6 inches) high-quality Fermacell solid construction panels
40 mm (1.6 inches) timber frame structure with Knauf Insulation, 40 mm (1.6 inches), thermal conductivity class 040
0.2 mm (0.008 inches) vapor retarder, diffusion equivalent air layer (Sd) 100 m (328 feet)
160 mm (6.3 inches) timber frame structure with Knauf Insulation, 160 mm (6.3 inches), thermal conductivity class 040
30 mm (1.2 inches) wood fiber insulation board
24 mm (0.9 inches) battens
Approx. 20 mm (0.8 inches) SL boarding, spruce (color according to color chart)
It would be very helpful if someone could explain the advantages of this vapor-permeable wall construction compared to other timber frame walls. The relationship to the ventilation system is especially important for us. With Hagemann Haus, we would have to forego this ventilation system altogether.
MStorm schrieb:
That’s true. Still, it’s frustrating to spend €200,000 on a house and not even be able to get what you really want.That’s exactly why I don’t understand why people don’t look for alternatives.
kubus schrieb:
That’s exactly why I don’t understand why people don’t look for alternatives. That’s precisely what I am doing, which is why I haven’t looked into the decentralized ventilation system yet.
B
Bauexperte16 Nov 2014 21:09Good evening,
You shouldn’t twist things to suit your needs!
If you want to sign with the supplier H., then do so ... with full commitment. If the ventilation system is important to you, then look for a different supplier or arrange for a decentralized system to be installed afterward (the necessary ductwork can also be purchased from H.) ... without putting H. in a bad light. If I want to have a house built by "X," I can’t hold them responsible for the features of "Y."
Regards, Bauexperte
MStorm schrieb:
It’s still frustrating when you spend 200,000€ on a house and can’t even have what you really want.
You shouldn’t twist things to suit your needs!
If you want to sign with the supplier H., then do so ... with full commitment. If the ventilation system is important to you, then look for a different supplier or arrange for a decentralized system to be installed afterward (the necessary ductwork can also be purchased from H.) ... without putting H. in a bad light. If I want to have a house built by "X," I can’t hold them responsible for the features of "Y."
Regards, Bauexperte
Help me understand: I want to buy a house from H. (as an example) with controlled residential ventilation. H. says they don’t have that. Okay. So where is the problem with involving a controlled residential ventilation provider early on, who can specify where holes are needed and when the system will be installed?
Or does something like this already have to be considered during the manufacturing process at the factory?
Or does something like this already have to be considered during the manufacturing process at the factory?
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