I was just at the structural engineer's and we should make the two walls load-bearing anyway. Therefore, they must be at least 17.5 cm thick and that settles the matter anyway.
Even though I personally prefer “white” inside due to lack of advantages of “red”. But with you, that will already start at the outer wall and therefore probably won’t be an option.
Why do you think it wouldn’t?
we should make the two walls load-bearing anyway.
I don’t understand that – especially making both load-bearing at the same time – nor could I align it with the ground floor (?)
Therefore they must be at least 17.5 cm thick and that settles the matter anyway.
I already said that nothing is settled by wall thickness.