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NCMA Solutions Center: Is there special detailing for combining clay and concrete masonry?

Yes. When using clay and concrete masonry in a single wythe the banding details should account for differential movement (shrinkage of concrete masonry and expansion of clay) of the two materials. Incorporating horizontal joint reinforcement, vertical control joints, and/or expansion joints are some of the things that can be done to prevent unwanted stresses due to shrinkage and expansion that can cause cracking. For more information on banding clay and concrete masonry, see TEK 5-2A Clay and Concrete Masonry Banding Details.