Shingles may be accumulating dirt or algae over time; or, the rough "granules" of the shingle surface may have worn off with age.
If the roof only leaks during driving rain, the problem may be with the flashing or underlayment.
Inadequate underlayment can allow water from melting ice dams to enter the attic.
Decaying siding or sheathing may be caused by poor attic ventilation.
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