hello!
I've torn out the bathroom on the upper floor and am about to start rebuilding, but I'm a bit uncertain about the floor construction.
It's currently framed at CC600, planning to have waterborne floor heating, wet room flooring, and there will also be a normal-sized bathtub there.
Now for the questions

1. Should I frame at CC300, or is CC600 enough?
2. Do I screw in grooved flooring and lay pipes and heat distribution plates?
3. A layer of floor gypsum glued on top of that?
4. Then self-leveling compound on that?
or am I way off track?