It is actually an algae. Pretty much all shingles used in the south are treated with copper to kill the algae. Unfortunately, it doesn't last forever and you may eventually see some black staining develop.
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Originally Posted by neilbcox
Have you ever noticed the stained roofs in Th Villages? I have so I went to my best friend who was a CFO with some of the largest shingle companies. Below is his expert opinion!
It sounds like fungus growth, which is common on roofs in this part of the country. There are several ways to treat this and even some ways to prevent it from coming back. We actually made a fungus-resistant shingle by mixing copper granules in with the regular granules. As the granules oxidized, it created a chemical reaction that would kill the fungus. Some people put copper strips on their ridges to get the same effect. Some companies will wash the roofs with similar chemicals. Check with a reputable roofer for your options there.
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