The most common culprit causing the black streaks on roofs is a blue-green algae called Gloeocapsa magma. Over the past 25 years this strain of algae has become more hardy and has migrated to less humid environments. It has now become a common sight on asphalt roofs across 80% of the United States. This video series shows how to clean your roof and get rid of the black streaks caused by algae.
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baseballgrader 3 years ago