Single-family house Which stone suits us?

@ Tego12: oh yes and could you please tell me which of these things are "Stammtischgeschichten"? I would rather claim that your disparaging talk about the unemployed counts as "Stammtischgeschichten"! :-)

On the topic of controlled residential ventilation: In my opinion, it is always mandatory nowadays because buildings have to be airtight. Nobody manages to ventilate sufficiently (except if someone is unemployed). Secondly, it greatly increases living comfort.

Who just mentioned something about "Stammtisch"? ;)
We only have a condensing boiler and built according to the Energy Saving Ordinance 2014 (around KfW 70). I have a hygrometer in every room.
We moved in May, after half a year the rooms reach 48-52% humidity when we are away all weekend; on a normal working day we don’t even get above 45%...
Well, the roof window was basically open all the time from May to October, there was a dehumidifier running in the house (which hasn’t been on since August), the windows were either tilted or fully open whenever we were at home.

A rough guideline at the end: we have a plaster facade and our construction water meter showed about 9,000 liters at final billing, in addition to that comes water from the foundation and ceiling.

: What does your wall structure look like? Monolithic construction Ytong? From your statements, I gather that you don't have a ventilation system?

36 cm exterior wall made of aerated concrete + plaster without ventilation system. I also had a few issues hanging my coat rack, but there are good solutions from the common manufacturers, you just have to not be squeamish :)

: We also just thought about it, nice thing!

Regarding drilling behavior: the more porous the stone, the easier the drilling - my opinion!
KS is solid and is the hardest to drill, Poroton is red and leaves red dust. If you generally drill into a joint/mortar, it is very tedious.
If a layperson drills into aerated concrete (Ytong), no craters form, provided you check beforehand if you are using the right drill bit. But as an unskilled layperson, you do things like that ;)
Every stone requires its own plug.
As a woman, I found aerated concrete to be the ideal material for me, yet we did not build with it.

In my opinion, a controlled residential ventilation system should be installed in the house today to ensure air exchange without wasting heating energy through open windows. This would be the case in winter or the heating phase. But windows tilted open all year round can suddenly attract burglars - the damage would then not be insured under new contracts (at least that is my knowledge).

Regards