- 1). Cut a piece of metal flashing to fit under the split shingle. Make the piece about 2 1/2 inches wide, and about 1 inch longer than the exposed portion of the shingle being repaired.
- 2). Bend the lower corners of the metal shim. Bend the corners down so that when the shingle is slid into place the bent corners will keep it from slipping out.
- 3). Insert the metal shim underneath the split shingle. Center the metal underneath the split in the shingle and knock it into place using a wood block and hammer. Position the metal shim so that its lower edge ends up flush with the butt end of the shingle.
- 1). Pry the damaged shingle with a pry bar. Lift the shingle until the nail shafts are exposed.
- 2). Pull the nails with a slater's ripper; or cut the shafts with a hacksaw blade saw.
- 3). Remove the damaged shingle.
- 4). Insert a new shingle into position so that the butt end of the replacement shingle is about 1 inch below the butt end of other shingles in the course.
- 5). Fasten the shingle with two corrosion-resistant nails. Drive each nail about 3/4 inches from the edges of the shingle. Start the nails just below the shingle course above, and drive them into the shingle at a 45-degree angle towards the upward slope of the roof.
- 6). Knock the shingle into place using a wood block and hammer. Position the shingle so that the butt end of your replacement piece is flush with the other shingles in the course.
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