Healthy Building - What is important?

  • Erstellt am 2021-09-06 17:45:45

haydee

2021-09-10 14:52:13
  • #1
I know what you mean. It has happened to me too, but there are really good ones where you don't stand in your own juice.
 

RotorMotor

2021-09-10 15:21:20
  • #2
Ah, measurable, then bring on the measured numbers. I have been waiting for that from you for so long. Because it makes me very skeptical that CO2 can pass through (walls, whether wood, stone, or plastic) and N2, O2, ... cannot, although they are smaller?! And that they then also have a preferred direction, that's rather adventurous! That some building materials can temporarily absorb some moisture and also release it again I can still imagine, but I would also be interested here in how the materials really differ (numerically). So how much better is the clay plaster? 1%, 10%, 100%?
 

nordanney

2021-09-10 15:41:35
  • #3
A wall that actually allowed free air exchange from inside to outside and vice versa would be a building physics disaster. With the air, heat and water vapor would also eagerly switch sides, resulting in energy waste and moisture problems up to mold infestation.

Perhaps a brief excursus on where the "breathable" walls come from (text Wikipedia, it’s easier than writing it yourself): "The hygienist Max von Pettenkofer found in 1858 during air exchange measurements in his office that after supposedly sealing all joints, the air exchange rate decreased less than expected and explained this by a significant air exchange through the brick walls. According to current knowledge, however, he had overlooked that rooms have other components than walls and that the stove in his test room was not sealed."

Even in masonry known to be well "breathable," water vapor diffusion – not air exchange – accounts for only max. 2 - 3% of the moisture removed by normal ventilation. When using the description of "breathable walls," the impression is often mistakenly given that there is an exchange of air from inside to outside through the walls. But that does not exist!
 

guckuck2

2021-09-10 16:14:09
  • #4
Exactly the same. Diffusion-open = minimally more moisture transfer compared to "hardly" or "not at all" diffusion-open. The relevance for an "indoor climate" is ridiculously low. Marketing and nothing more. If you want good indoor air, you can do something with materials (moisture-regulating, directly preventing entries). But the royal road is air exchange. Since all new buildings are airtight by law, this is solved by means of a ventilation concept. There are various solutions from manual ventilation to controlled residential ventilation.
 

Bertram100

2021-09-10 16:22:30
  • #5
I experienced it differently. I have been in a solid wood house (the walls were whole, peeled tree trunks) and I have also been in a house whose timber framing was filled with a clay-straw combination. Even as a visitor, I could notice that it was very pleasant inside the house.
 

RotorMotor

2021-09-10 16:29:22
  • #6
And what was so pleasant about it? Or more pleasant than in other houses? Or even more pleasant than outside? Or was it perhaps just the wooden appearance? Or the resin that evaporates from the wood?
 

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