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What is causing the algae growth on my shingles?

April 26, 2017algae causing growth Shingles

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What is causing the algae growth on my shingles?

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Algae growth is typically seen on light colored shingles. It exists as a brown to black discoloration of the shingle and is caused by an algae known as Gloeocapsa. Although algae may exist on a shingle, it does not affect the performance of the shingle. Essentially, this is an aesthetic problem.