What is the most effective asphalt shingle product available to inhibit algae growth and prevent the black staining?
Look for the Scotchgard™ Algae Resistant Roofing System logo on quality shingle brands. The Scotchgard™ Algae Resistant Roofing System means protection. Many shingles feature algae resistance. But your assurance of the optimal long-term protection from granule discoloration due to algae can only be achieved when the precise level of granules with Scotchgard™ protection is uniformly distributed across the surface of the shingle in combination with standard colored granules.
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