ᐅ Which wall assembly is suitable for being vapor-permeable?
Created on: 15 Mar 2021 12:34
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Hausbauer2021
Hello everyone,
I am currently researching wall construction with a focus on vapor-open systems. I am very concerned about mold growth in the house, which is why I have often read that a vapor-open build is preferable (using a vapor retarder instead of a vapor barrier). However, when I look at the wall constructions of various manufacturers, a vapor barrier is often installed rather than a retarder (for example, Danwood). If the mechanical ventilation system fails, does this then inevitably lead to mold growth? Can anyone share their experience with how this (PE foil) actually performs in a house? Are there wall constructions where a mechanical ventilation system is installed as a nice-to-have but not essential? We currently live in an apartment and have to air the rooms multiple times in winter to prevent mold from forming under the blinds’ boxes. Are there houses or walls that do not experience these problems? We definitely want a ventilation system, but I would like to avoid the worry of mold growth within a few days if the system fails.
Thank you very much for your experiences.
I am currently researching wall construction with a focus on vapor-open systems. I am very concerned about mold growth in the house, which is why I have often read that a vapor-open build is preferable (using a vapor retarder instead of a vapor barrier). However, when I look at the wall constructions of various manufacturers, a vapor barrier is often installed rather than a retarder (for example, Danwood). If the mechanical ventilation system fails, does this then inevitably lead to mold growth? Can anyone share their experience with how this (PE foil) actually performs in a house? Are there wall constructions where a mechanical ventilation system is installed as a nice-to-have but not essential? We currently live in an apartment and have to air the rooms multiple times in winter to prevent mold from forming under the blinds’ boxes. Are there houses or walls that do not experience these problems? We definitely want a ventilation system, but I would like to avoid the worry of mold growth within a few days if the system fails.
Thank you very much for your experiences.
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nordanney25 Mar 2021 10:58T_im_Norden schrieb:
Either mechanical ventilation with heat recovery And what about decentralized fans? They are also mechanical ventilation with heat recovery. Instead of two large openings in the façade, you get several small ones. They don’t create significant thermal bridges or poor insulation of the devices. These are basically the same units as in a "large" central system, just smaller.
A central mechanical ventilation system with heat recovery is of course more elegant, but also much more expensive.
By the way, a window rebate vent is basically just a window permanently tilted open. I consider that a disaster. But it’s very cheap.
T_im_Norden schrieb:
Personally, I am not in favor of decentralized ventilation systems at all. It should either be a mechanical ventilation system with heat recovery or window frame ventilation.Mechanical ventilation with heat recovery only makes sense when it is centralized; conversely, centralized mechanical ventilation is only practical if you want to include all or most rooms in the system. Mechanical ventilation for only selected rooms makes more commercial sense in a decentralized setup, but this is then without heat recovery. A well-known home builder (Kern), as far as I know, favors decentralized mechanical ventilation—probably because it is more cost-effective for their construction method using formwork block systems.https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
untergasse4325 Mar 2021 16:49For me, the decentralized option would be a no-go solely because of the facade appearance.
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alterego13425 Mar 2021 17:14untergasse43 schrieb:
For me, the decentralized option is a no-go just because of the facade appearance.I always think the same when I see a facade cluttered with ventilation openings...
If you’re already replacing the windows as part of a renovation, integrated window ventilation systems with heat recovery could be a solution, couldn’t they? They are practically invisible.
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nordanney25 Mar 2021 18:2011ant schrieb:
Mechanical ventilation with heat recovery obviously only works well if it’s centralized; May I ask why?
alterego134 schrieb:
Would integrated window ventilation with heat recovery be a solution or not? What is that? I wasn’t aware of integrated systems with heat recovery before. The heat exchanger and technology take up a lot of space. I only know of decentralized systems with ventilation openings on the outer window reveal.
nordanney schrieb:
May I ask why?The process of heat recovery is technically less efficient when implemented in individual room mini controlled residential ventilation units; I’m not even sure if the manufacturers don’t actually agree and only offer heat recovery with central systems.https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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