Attic with roof terrace -> full floor calculation

The roof terrace is not included in the area over 2.30m. So you can have 53sqm over 2.30m and then as much roof terrace as fits.

I don't exactly understand why I should leave out the roof terrace.

You should leave out the roof terrace in the calculation because it does not have a clear room height!

I think you mean the same thing and are talking past each other. The thread starter considers the 3/3 and asks whether a rooftop terrace counts as part of the 2/3. You only look at the 2/3 and say: "Leave out the rooftop terrace," which answers the OP's question with "No!"

I think you mean the same thing and are talking past each other.

Yes, but in the end we fortunately still found common ground thematically