How do I drain water from a window opening?

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Interested in the question, I saw that when finishing windows on houses with a facade of metal siding the upper slope of metal is usually set. I myself began to wonder how to properly make the upper slope of the window. And more precisely not clear at a strong slanting downpour of water from the wall will flow and will begin to flow into the area adjacent to the siding outcrop and then flow behind the metal lining, and there it will pour into the insulation?



There is a groove in the slopes, in which the siding is inserted, this groove of the upper slope is bent at the edges and the water flows down this gutter to the bottom slope and down the facade.


I would recommend to use this scheme.

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