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This is a nice demonstration of the sequence of bending flashing. However, the installation as explained will leak at the corners. By simply cutting the top and bottom flashing at the corners and bending the vertical leg around the corner will leave a hole right at the bottom of each corner. Even if the step flashing is cut in a similar way with a vertical leg bent around the corner, there is still a hole at the bottom of each corner. These holes can be caulked as the flashing is installed, or the top and bottom flashing need a corner return soldered as part of each end of the top and bottom flashing. Easier shown than explained. If the video actually showed a corner with the flashing cuts, this would be evident.
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