Will the algae and moss harm my roof?

Algae is a problem because it will lead to moss and lichen. Moss and lichen grow roots into the granules causing them to lift. Removing the black algae streaks and stains will prevent the eventual growth of moss and lichen.
Will the algae and moss harm my roof?

Should zinc strips be put on the roof to make the streaks go away?

Zinc strips will not eliminate streaking that has already occurred. Zinc strips were designed as a deterrent to keep the streaks from ever forming in the first place. Zinc strips have not proven to be completely effective. However, we are happy to install them if you would like them.
Should zinc strips be put on the roof to make the streaks go away?
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