Step 6: Install the upper course of replacement shingles.
For the upper course, slide the replacement shingle up and under the existing course above. Center the new shingle in place but leave the bottom of the new shingle about 1/4 of an inch below the bottom of the existing shingles in the same course. Drive two galvanized 8-penny nails into the new shingle. Drive the nails up and under the drip line of the shingle above, and then drive them in at an angle.
 Hammer up at an angle to drive the nail under the drip line.
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