5 Simple Steps to Repairing Shingles

April 26, 2010

Shingles play such a critical role in the performance of your roofing system that they absolutely must be periodically examined for wear and tear. This 5-step repair plan is simple enough for even the most inexperienced DIYer to complete. Keep in mind that only a certified contractor is qualified to complete major roof repairs, but following these steps could help you intercept a small problem before it becomes an expensive one.

1. Cut through the adhesive line.
Find the dashed line of asphalt adhesive that runs across the middle of the shingle. This is called the adhesive line--or sealer strip--and provides extra anchoring to secure the piece. Use a long knife, putty knife, or small crowbar to gently lift the shingle at the adhesive. Slide the tool across the entire shingle, as well as the two upper shingles that secure the damaged one in place.

2. Remove nails from the damaged shingle.
This step takes a steady hand, as you want to avoid damaging the securing shingles in the row above the shingle to be replaced. Using a pry bar on top of a wood block, gently lift on the shingle high enough to loosen the four nails in the middle of the piece.

3. Loosen nails from the securing shingles.
Repeat the nail removal process for the two upper shingles that secure the damaged one. There is no reason to remove these nails. Just lift them far enough up to set the damaged shingle free.

4. Remove and replace the damaged shingle.
Slide out the damaged shingle and use it to size the replacement shingle if it's not standard width. This holds particularly true for shingles around the edges and corners of your roof. Use a utility knife to cut precisely. The fit should be snug.

5. Nail and cement the replacement shingle.
Using a nail driver, place four nails across the middle of your new shingle. Also, secure the two upper holding shingles using the nails already in the pieces. Add a small amount of cement over the nails and press firmly.

KEEP THIS IN MIND! Placing a double layer of shingles over your roof to repair cracks, blisters, or curls is never a good idea! While it seems like a quick fix, several problems may develop. If you have a smaller or manufactured home, the sheer weight of that second layer may be too much for the trusses to bear. And if cracked shingles are your problem, water will inevitably penetrate the seal of the shingles and cause mold in your attic.

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