Roofing shingles used in the south have, or should have, copper infused granules that will keep algae under control. My past experience indicates that there is a finite life to their algae killing ability. In a previous home, after about 10 years I started to see algae growth (black vertical stains) on the north facing roof. Copper strips, as high up as possible, will also do the trick but the extent of the "coverage" seems to be about 18 feet. In other words, if your roof is deeper than that you may need a second strip of copper 18 feet down from the peak. You may want to touch base with a professional roofer.
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Originally Posted by saratogaman
Are zinc strips recommended to prevent algae growth on roof shingles? I see a number of homes in Duval (10 years old) with algae developing but not (yet) on most.
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