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Typically, concrete masonry units have nominal face dimensions of 8 in. (203 mm) high by 16 in. (406 mm) long, although other nominal face dimensions are available that accommodate an 8 in. (203 mm) module.
Footnote C establishes a thickness requirement for the entire face shell. C When the units are to be solid grouted, minimum face shell and web thickness shall be not less than 5/8 in. (16 mm). D Minimum normalized web area does not apply to the portion of the unit to be filled with grout.
UNIT SIZES. Typically, concrete masonry units have nominal face dimensions of 8 in. (203 mm) by 16 in. (406 mm), available in nominal thicknesses of 4 , 6, 8, 10, and 12 in. (102, 152, 203, 254, and 305 mm).
Minimum face shell and web thickness requirements of ASTM C90-21, Standard Specification for Loadbearing Concrete Masonry Units (REF. 6). All mortar joints are 3/8 in. (9.5 mm) thick. The mortar joint depth is equal to the thickness of the face shell or web on which it is placed.
In this example, face shell bedding is used for mortar, therefore the bed joint covers both the face shell area for both face shells. The head joint mortar thickness is equal to the face shell thickness. The volume of mortar (Vm) is calculated as follows:
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a standard thickness, 13/8 in. for 10-in. units, 11/2 in. for 12-in. and greater (35 mm for 254-mm units and 38 mm for 305-mm and greater), and. a reduced thickness that can be used when the allowable loads in empirical design are correspondingly reduced.
