How To Fix Curling And Cupping Shingles
If you have an asphalt roof, you may eventually see damaged shingles that curl or bubble. Most issues with shingles come from exposure to the elements and heat.
Curling also occurs because of improperly secured shingles, multi-layer roofs that put weight on the shingles below, or poor attic insulation allowing moisture onto the decking. You should be able to fix the shingles by following these steps.
Prepare to Fix the Shingles
To fix curling or cupped shingles, gather the following:
- work gloves
- extension ladder
- tool belt or five-gallon bucket
- galvanized roofing nails
- flat nail bar
- utility knife
- paint brush
- brick or cinder block
- roofing cement
- replacement shingles
Make certain you feel confident working from heights. If you don't trust yourself, or there are a number of damaged shingles, hire a professional roofer. Roofs with dark spots or shingles with most of the granules worn mean it is time for a roof replacement
Set a ladder on a sturdy area, and get someone to hold it for you, or attach a safety harness. Use a tool belt or pull a five-gallon bucket to the roof by rope
To fix a bubbling shingle, use the utility knife to slice a line in the middle of the bubble, making the cut slightly wider than the bubble. Take care to not damage the underlayment.
Spread some cement or mastic on the putty knife, and fill the cut area two-inches past the damage in all directions. Cut a piece of spare shingle two inches bigger than the damaged area, and press it into the cut space. Close the opening, and spread cement or mastic two inches beyond the repair area; then let the cement or mastic dry.
Repair Curling Shingles
Gently lift the corner of the curled shingle. Use the flat pry bar to pull nails from the damaged shingle, if needed. Grip the nail head with the prongs, slightly angle the handle, and tap the handle using the hammer.
Spread cement under the corner, and push it firmly on the surface. Lay a brick or cinder block on the shingles overnight to help them lay flat, or nail the corners down if they are on sloped areas. Check for curling after 24 hours, and if it looks good, cover the nail heads with cement, and sprinkle granules over the shingle to hide the repair.
To replace the shingle, when all else fails, completely remove the shingle. Raise the edge of the shingle above the damaged area, spread cement on the surface, and slide the new shingle in place, aligning edges.
Press the shingle down, and hammer nails evenly spaced in each corner. Cover nail heads and under the tabs with cement using the provided applicator.
For more information on roofing repairs, contact a professional.