The metal roof drip edge should always be positioned to hang down so that its bottom edge sits directly on the inside of the gutter, meaning the gutter goes under the drip edge. This precise alignment ensures that any rainwater shedding off the roof deck flows smoothly over the metal drip edge and drops straight into the gutter trough without running down behind the back wall of the gutter, leaking onto the fascia board, or rotting the underlying wooden structure over time.
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