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Physical requirements prescribed by ASTM C90 include dimensional tolerances, minimum face shell and web thicknesses for hollow units, minimum strength and maximum absorption requirements, and maximum linear drying shrinkage. (SEE TABLE 2).
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.
Figure 1 illustrates nominal and actual 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, and thicknesses may be available from local concrete masonry producers.
TABLE 1 summarizes typical assembly weights for an 8 in. (203 mm) wide concrete masonry unit assembly with varying unit densities and spacing of vertically grouted cells.
Minimum face shell and web thicknesses are those deemed necessary to obtain satisfactory structural and nonstructural performance. Note that although there are some unique face shell thickness requirements for split-faced units (see Table 2 footnote B), ground-face units (i.e., those ground after manufac-
Placement: At first course above grade and at all supports. Code required spacing: 33” o.c. MIW recommended spacing (Brick): 24” o.c. MIW recommended spacing (CMU): 32” o.c. Size: The bigger the weep hole is, the more water it allows out of the cavity and the more air it allows to circulate through the cavity.
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