AC212 Water-resistive Coatings Used as Water-resistive Barriers over Exterior Sheathing—Approved February 2015, editorially revised July 2020 (PDF Download)
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AC212 establishes guidelines for evaluation of water-resistive coatings used as water-resistive barriers over exterior sheathing. The coatings are covered with either a code-approved exterior wall covering, or one that is recognized in a current ICC-ES evaluation report. Substrates that can be considered under this criteria are wood-based and gypsum-based sheathings, and cementitious backer units complying with ANSI A118.9, or equivalent.