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    4. what are the dark areas on shingle roofs between the roof trusses
    what are the dark areas on shingle roofs between the roof trusses

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    0  Views: 405 Answers: 1 Posted: 14 years ago
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      It may be Algae>>http://inspectapedia.com/roof/Shingle_Algae_Stains.htm

      12 years ago. Rating: 4
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