Surprisingly, the sun does more to damage a roof than wind or rain. The constant bombardment of the sun's rays works to make shingles brittle over time. The sun also softens the tar that binds shingles together, which makes them susceptible to warping. Due to warping and cracking, rainwater can penetrate through the interlocking system of shingles your roof integrity depends on.
Rain and wind, after the sun, are the most common causes of roof leaks. Stormy weather can make shingles shift, bypass imperfect seals around vents and flashing, and otherwise infiltrate beneath the shingles and roofing felt
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