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Repair a split shingle by closing the gap between the two pieces, nailing them to the roof deck, and sealing the crack and nail heads with roofing cement. Shingles that have lifted from the roof can simply be nailed down; seal the nails with roofing cement.
To replace a damaged shingle, pull out as much of it as you can, splitting it along the grain of the wood if need be. Pry up the shingle above the damage to reach the nails holding it down; cut these nails off to the roof deck. You’ll need a tool called a shingle ripper (or a hacksaw blade) to do this. Take care to not damage the roofing material beneath the shingles.
Insert the new shingle and allow it to stick out about a quarter of an inch below the other shingles. Because shingles and shakes come in random widths, you’ll probably need to trim the shingle to fit the space. Leave a quarter of an inch on either side of the shingle so that the wood can expand with moisture changes.
1) Split and remove all pieces of the damaged shingle.
2) Cut off the nails, using a shingle ripper.
3) Nail the replacement about 1/4-inch lower than its neighbors, then drive it up with a wood block.
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