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Is green or black algae on roof shingles as much of a problem as moss or lichens?

April 26, 2017algae Black lichens moss problem roof Shingles

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Is green or black algae on roof shingles as much of a problem as moss or lichens?

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Algae on a roof surface appears as a thin green coating which is mostly a cosmetic concern. The presence of algae on the roof is an indicator that this roof area is in a shaded spot where you may want to be alert for development of moss or other roof problems, but the level of damage from algae is probably low, even less than that caused by lichens. Avoid any aggressive cleaning methods that might damage the roof surface.