TYPICAL SIZES AND SHAPES OF CONCRETE MASONRY UNITS -
Specified 3 dimensions of concrete masonry units are typically /8 in. (9.5 mm) less than nominal dimensions, so that a 4 or 8 in. (102 3 or 203 mm) module is maintained with /8 in. (9.5 mm) mortar joints. Figure 1 illustrates nominal and specified dimensions for a nominal 8 x 8 x 16 in. (203 x 203 x 406 mm) concrete masonry unit. In addition to these standard sizes, other unit heights, lengths