You mean because then there is one centimeter of sheet metal on the left and right each that "stands in"? Hmm. Well, but what would be the alternative?
Well, agreed, good question. I would have to check again but probably something like aluminum window sills on the windows. Done. It could be that a quantity is listed in the offer. I can take a look tonight. But that doesn't really help me much either. The general contractor wants to do it, of course. However, he doesn't want to tear open the facade for it, and I actually don't want that either.