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What's Causing Those Black Streaks on Your Roof?

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Those unsightly dark lines appearing on your roof aren't always a sign of damage. Most commonly, they're the result of algae growth, specifically a type called Gloeocapsa magma. This growth thrives in humid conditions, https://bookmarkbooth.com/story22244559/what-s-causing-those-black-streaks-on-your-roof

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