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RainBloc® for Mortar is a liquid admixture used at the masonry construction site to make mortar. RainBloc® for Mortar should only be used with concrete or clay
masonry units manufactured with RainBloc® water repellent additive in exterior masonry wall construction. To ensure your masonry wall system is completely water repellent you must remember to include the Rainbloc additive to the masonry mortar on site.