What causes the shingles on a roof to curl under? Is it wind/weather damage?
Answers:
This is from the sun and age. The older the shingles get the more the sun attacts them and they begin to shrink and curl. How old is your roof. If it is 15 years or older than it is time for a new one. If it is newer get a hold of the manufactor or installer.
Other answers:
It could be age, or it could be that the attic is too hot. Do you have eave or gable vents? How about vents in the roof or peak?
It could be age, or it could be that the attic is too hot. Do you have eave or gable vents? How about vents in the roof or peak?