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Cupping and Curling Asphalt Roof Shingles


Curling and Cupping Roofing Shingles Should be Replaced ASAP


By Mark J. Donovan



Curling, fishmouthing and cupping asphalt roof shingles is a clear sign that your shingles have been stressed and are in need of replacement.


If while inspecting your asphalt roof shingles you notice shingles with concave centers and/or raised or curled edges your roof should be repaired soon. As a matter of fact, if you observe these conditions prior to actually walking on the roof, do not go further.


Stay off the roof, as curling and cupping asphalt shingles are extremely fragile and by walking on them you run the risk of cracking them and causing roof leaks.


Curling and cupping asphalt shingles may not leak for a couple of years, however they are at the stage where they could leak at any time, and thus why I recommend replacing them as soon as possible.

Cupping and curling asphalt roof shingles should be repaired before the roof leaks.

Photo by Mark Donovan


Curling and cupping roof shingles can occur for a variety of reasons. The shingles may simply be old and solar and weather conditions may have simply got the best of them. However, in many cases cupping and curling roof shingles is a sign of inadequate insulation and ventilation in the attic. If heat builds up in the attic and is not relieved by ridge, soffit, and gable vents, the roof shingles can become extremely stressed. This stress manifests itself in distorted and cracked shingles.


Curling and cupping asphalt roof shingles can also be the result of ice dams. Water that works its way up under shingles and then freezes distorts and stresses the asphalt shingles significantly. Again, proper attic ventilation and insulation can prevent ice dams from occurring.


So if you observe cupping, fishmouthing or curling asphalt shingles, contact a roofing contractor as soon as possible.

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If the asphalt shingle distortion occurred well short of the expected life of the shingles also inspect your attic to make sure you have adequate attic ventilation and insulation.


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For more help on Shingling Your Home's Roof, see HomeAdditionPlus.comís Asphalt Shingle Roofing Bid Sheet. The Asphalt Shingle Roofing Bid Sheet will help to ensure that your roof won't end up with a blue tarp over it and a dumpster sitting in your yard for weeks as you wait for the roofing contractor to come back and finish roofing your home.

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