I’m going to make a statement that not everyone will agree with, windows leak water. Not all are leaking now, some will develop the leak later, as the window and the sealing products used to install the window age. The leak may be an error or failure in the installation, or it could be the window itself that is leaking. It could be a design error, water funneling off a roof over a window, such as in the photo. The leak may only be an incidental amount of water, or it could be a major bulk water concern. The leak may also only be active during the once every ten-year major rain fall event. The point is windows will leak water.
