Those black streaks are algae, not age. Here's what causes roof streaking in the Big Bend and how to treat it safely.
The dark streaks running down North Florida roofs are a blue-green algae called Gloeocapsa magma, not dirt or worn shingles. It feeds on the limestone in asphalt shingles and spreads fastest in the shade and humidity that define the Tallahassee area.
High pressure strips shingle granules and cracks tile, shortening the life of the roof and voiding many warranties. A low-pressure roof cleaning in Tallahassee uses a soft-wash treatment that kills the algae at the root.
Because the treatment kills the organism, results last several years. Under heavy tree cover, treat the roof before the streaks get dark and pair it with a house wash. Get an upfront roof-cleaning quote.
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