Step 9: Use a 2x4 to align the new shingles.
The installed, upper course of replacement shingles should be nailed in place but 1/4-inch lower than the existing shingles of the same course. Place a 2x4 under the new course of shingles and hammer up. This will bring the shingles up into alignment and also straighten out the angled nails. Now, place the same 2x4 over the face of the overlaying shingles and give the board a single sharp rap to set the nails underneath in place. With some touch-up stain or paint, the replacement shingles will soon blend right in.
 Hammer up into the 2x4 to bring the new shingle flush with the rest of the course.
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