roof streaking

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Why does my roof have black roof streaks?

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black roof streaks example

Signs of dark roof streaks or discoloration can begin to show approximately five years after an installed roof. Mistaken for dirt or granule loss, the dark streaks usually appear on the north-facing slope of the roof. These streaks are commonly a result of algae growth. Roof streeks are most prominent on roof areas that receive less sunlight.

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