Figure 2-4. Planning concrete-wall openings
2-8. Nominal Length and Height. All horizontal dimensions should be in multiples of nominal full-
length blocks. Both horizontal and vertical dimensions should be in multiples of 8 inches. Table 2-1,
page 2-8, lists the nominal height of concrete-block walls by stretchers. Table 2-2, page 2-9, lists the
nominal length of concrete-block walls by course.