Algae Danger Zones
Algae are seen on roofs in over 80% of the United States. Appearing first on the north slope of a roof,
where extra shade and moisture support its growth, algae’s windborne spores can quickly spread
from shingle to shingle and rooftop to rooftop. In at-risk areas, the Scotchgard™ Algae Resistant
Roofing System logo on quality asphalt shingle brands is your assurance of built-in long-term algae and
stain resistance.
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