External sealing for terrace windows is sufficient here with insulating paint

Hey

We are currently looking at how to represent the sealing all around.
At the moment, we have a floor slab (strip foundations all around) with bitumen sheet as horizontal sealing and then the walls on top of that.
All around it's plastered including colored roughcast, beneath that down to about 30cm depth under the slab I now want to apply insulating coating and dimpled membrane, then later gravel splash protection in front of that.

I am a bit confused about the terrace window here.
Also paint the white area and then put a drainage channel in front of it? The window is fixed, so this is really only about "how to best let the rainwater drain".

Attached is a picture so you know what I mean

But the window installer forgot something. That is not watertight against driving rain. There still needs to be an EPDM membrane or something similar. Your gutter then protects against standing and pressing water

Ah thanks, then I will probably take care of that first.