Method of inhibiting algae growth on asphalt shingles

Coating processes – Solid particles or fibers applied – Roofing produced

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427214, 427219, 428404, 106 1836, B05D 700

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053566645

ABSTRACT:
A method of inhibiting algae growth on an asphalt shingle surface exposed to varying humidity using a blend of copper-containing algae-resistant granules and non-algae-resistant granules. The copper-containing algae-resistant granules comprise a substrate granule having at least one inner ceramic coating layer comprising cuprous oxide and a seal coating having a thickness covering the inner layer and which is at time t.sub.o devoid of copper.

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