Black stains on roof

What is it and what causes it?

Thanks!

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Algae.

Visit this website for more information:

http://edis.ifas.ufl.edu/HE640

Here is another one. Not only tells the story of what causes this but offers some real solutions. Enjoy. I like your last name.

http://www.durashield.com/

Thanks Joe and Doug for that helpful info. By the way, Doug, I like your name too. Douglas Edwards is my late grandfathers name. Everyone called him Doug.

I like this site…

http://www.askthebuilder.com/082_Black_Algae_Stains_On_Asphalt_Shingles.shtml