Yes, I lived in a place where they commonly put a steel sheet on the window sills (not sure of the terminology), probably to protect the concrete from water inf

Yes, I lived in a place where they commonly put a steel sheet on the window sills (not sure of the terminology), probably to protect the concrete from water infiltration, and it was horrible as soon as it rained. And it rained a lot. Like almost always when it was not snowing. In fact, it was worse when the rain was just a drizzle and the drops coming from above the window would fall distinctly, one after the other, on the sheet. In the place where I am now, metal roofs are only used for barns (or industrial warehouse and such, if there was any).