AW: Suche glass fasade detail

Yes,the structure is metalic.The slab is concrete on corrugated steel formwork but no concrete attic. I see two solutions:
A) The slab has a stopper for horizontal insulations, for the vertical attic is used only the curtain wall sistem with back facing panel. The problem is the where do you fasten the waterproof membrane?
B) The slab has above a metalic structure for the attic,backing the curtain wall.The wp membrane is fixed on the metalic profiles, but it's more complicated structure.
Tell me what do you think.

Miniaturansicht angehängter Grafiken

   

Hmm, do you really need an attic of that height? If not, just cut off the curtain wall so that it matches the top of your angle profile (variant A). That's exactly where the water proofing may end (in Germany, you have to go 15 cm above the general water proofing level).

Is the front sandwich panel an asset in the building's elevation? If not, omit the panel by raising the glazing to the top of the lowered attic.