When an asphalt shingle is beyond simple repair, it’s best to replace it. Asphalt shingles are relatively easy to replace, but the repair may stick out like a sore thumb if you don’t have an exact replacement for your type of roofing.

When you visit a roofing dealer or home improvement center, take along a small, broken piece of your existing shingles to help you find a good match. (It pays to store a few shingles for repairs when you roof your home.)

To remove and replace a damaged shingle:

1) Use a flat prybar to gently lift the two shingles directly up-roof from the damaged one. Break the black, self-sealing strip that holds the shingles in place by sliding the prybar along the length of each shingle.

2) Raise the shingle tabs, and carefully pry up the nails holding the damaged shingle and the shingle directly above it (this means you’ll have to go two shingles up-roof).

3) Slide out the damaged shingle.

4) With a utility knife, cut off a small piece from the top corners of the replacement shingle, and then slide the shingle into position under the existing shingles, being careful not to tear the roofing felt.

5) Nail the new shingle in place with galvanized roofing nails, hammering against a prybar placed on the nail heads, under the shingle above. Cover the nail heads with plastic roofing cement, and spread a little extra cement beneath the tabs that you folded back to help glue them back down.

Don’t remove slightly damaged shingles from ridges; instead, nail each corner of the existing shingle in place and cover with a new one. Likewise, if a ridge or hip shingle is damaged, nail down each corner with roofing nails, and apply a second shingle over the top, first coating the bottom of that shingle with roofing cement. Nail down the corners, and cover the roofing nail heads with plastic roofing cement.