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Q & A: Why is my roof discolored?
Q. I have a light-colored roof that is only 9 years old, and over the past year I've developed dark streaks throughout the roof. I've been told that it is mildew. I have no high trees nearby, and no one else in the neighborhood has such a condition. What causes it, and how can it be cleaned up? -- George Borguno, Moriches
A. The streaking in this case stems from a moisture issue, says Jerry...
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