Use a caulking gun to apply a dab of roofing sealant about 4 per 10 oz.
Repear roof asphalt shingle.
As asphalt shingles get older their corners often begin to curl downward or upward.
Use a flat bar to pry up the damaged shingle and remove the nails being careful not to damage the shingle above it.
Tube under the corner.
Repairing or replacing the most common type of roofing asphalt or asphalt fiberglass shingles sometimes called composition roofing is relatively easy but be sure you can work safely and comfortably on it before you decide to make your own repairs.
Just remove them and replace them with new shingles of a similar style to the rest of the shingles on the roof.
Repair a torn or curled asphalt shingle.
Replace a badly damaged asphalt shingle.
If you notice a shingle starting to curl you can forestall the inevitable curling by gluing down the curled section.
This is a serious problem and will require a roof replacement.
Loosen the adhesive underneath the tabs of the damaged shingle then pull them free and discard.
Loosen and remove the damaged shingles.
How to replace an asphalt roof shingle.
About repairing a roof yourself.