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Vellumcedar7
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RE: Black algae streaks returning after roof cleaning
I’d be cautious about treating zinc strips as a dependable whole-roof preventative, even where they’re installed correctly. They work by releasing zinc into rainwater, so coverage depends on water actually washing over t...
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RE: Black algae streaks returning after roof cleaning
Before treating the roof again, have the cleaner determine whether the streaks are still biological growth or whether you’re seeing granule loss and permanent discoloration. Flat staining on the shaded slope can be algae...