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There is no static calculation because everything is approval-free. The contractor only told me which stone to use. I just wonder if a higher airtightness level makes noticeable differences. I don't feel like the stone chipping right away if you hit it with a bike, wheelbarrow, or something similar. Therefore, no aerated concrete either, as originally suggested by the contractor (although, of course, there are different airtightness levels for aerated concrete as well).

The bulk density of the stones has no effect on the holes you make with the wheelbarrow in the plaster of your finished house. But it has an effect regarding soundproofing, thermal insulation, and load-bearing capacity; I would decide based on that if both meet the structural requirements.
Best regards, Nida

Eieieiei I mixed up the compressive strength

A house without structural engineering? I've never heard anything so weird. Do they hold their finger in the air?

Are there not single-family houses where a structural stability certificate or something similar is sufficient? Then no structural engineer needs to be involved. It could be that I am mistaken!

Yes, you are mistaken. Without structural analysis, no one builds in Germany.