September 6, 2018
Yes. The dimensions of concrete masonry units (CMU) must meet the requirements of ASTM C90, Standard Specification for Loadbearing Concrete Masonry Units. ASTM C90 provides minimum dimension requirements as well as permissible variations for CMU. For more on CMU configuration, see TEK 2-5B New Concrete Masonry Unit Configurations Under ASTM C90.