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What's Causing Those Black Streaks on Your Roof?

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Those unsightly dark marks appearing on your roof aren't usually a sign of damage. Most commonly, they're the result of algae growth, specifically a type called Gloeocapsa magma. This fungus thrives in warm conditions, https://bookmarkworm.com/story22152598/what-s-causing-those-black-streaks-on-your-roof

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