Why Are There Black Streaks on My Roof? What Central Valley Homeowners Should Know
A lot of homeowners assume those dark streaks are just dirt, dust, or age. In many cases, though, the staining is caused by living organic growth such as algae, moss, or lichen. These growths can make your roof look older than it really is, hurt curb appeal, and in some cases contribute to long-term wear if they are left untreated.
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