Yes, asphalt roof shingles should slightly overhang the outer edge of the metal drip edge by approximately one-quarter to one-half of an inch. This specific overhang distance ensures that rainwater running down the roof slope flows cleanly off the edge of the shingles and drops directly into the metal drip edge, which then guides the water smoothly into the gutters. If shingles are cut too short, water can curl backward and rot the roof deck, and if too long, they can sag or break.
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