Window connection / reveal in double-leaf masonry

That the inner sealing is made with such [APL] - that is unfortunately wrong.

Nope ... just take a look at post #5

Rhenish greetings

Yes, I still don't read anything about an internal sealing. He never connected it with that anyway ;)

So with us in the new building, the plasterers also worked with a [Anputzleiste], they don’t do anything different.

Good, then it must be like that everywhere ;)

I didn't say that :p You probably got up on the wrong side of the bed today ;) I just wanted to express that there is no "general" rule, but it is probably done differently everywhere.