On a relatively new facade (passive construction), when it rains heavily or for a long time, water flows under the window sill from somewhere under the facade. Would anyone have an idea where this water would come from?

This problem has been relevant for a couple of months, I have been in contact with various experts or installers and none of them can find the source.

The visible water spot is only visible on the outside of the facade (finish layer, the inside facade is completely dry)

https://www.reddit.com/gallery/1fw86bn

Posted by nejc03

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