Method for treating asphalt shingles

Abstract

A method for treating an asphalt shingle comprises applying a coating composition to a surface of an asphalt shingle, or to granules formulated for use in a granule layer of an asphalt shingle. The coating composition includes: (a) a film-forming component; and (b) a biocide component. The biocide component comprises (i) a first organosulfur component, (ii) a second organosulfur component different from the first organosulfur component, and (iii) an organozinc compound. The coating composition optionally further comprises (iv) a nitrogen-containing heterocycle that includes an attached alkylamino group and/or an attached alkylthio group, and/or (v) a carbamate compound.

Dependencies are inferred from the claim text.