The growth of fungus and algae spores can create black streaks on asphalt and fiberglass roofs. This can lead to water leaks, the need for roof replacements and may even reduce the value and appeal of your home.
Most often you will find these streaks on the north side of your roof, as this side of your house receives the least amount of sunlight during the day. The moist environment creates a breeding ground for algae and fungus to grow.
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