Most homeowners don't realize: neglecting roof algae can void your shingle manufacturer warranty. Here's what you need to know.
Most major shingle manufacturers — GAF, CertainTeed, Owens Corning — include maintenance clauses in their warranties. If you allow biological growth like Gloeocapsa magma (the black algae streaks) to persist unchecked, it can be classified as "homeowner neglect," potentially voiding your warranty coverage.
On Long Island, our coastal humidity creates the perfect breeding ground for this bacteria. It feeds on the limestone filler in your shingles, accelerating degradation. A roof replacement costs $15,000-$30,000. A professional roof soft wash costs $400-$900.
The Asphalt Roofing Manufacturers Association (ARMA) explicitly recommends soft washing — never pressure washing. Our veteran-owned team uses the exact chemical ratios recommended by ARMA to safely kill algae at the root without stripping a single protective granule.
Don't gamble with a $20,000+ asset. Schedule a professional roof cleaning and protect both your warranty and your investment.
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