A submittal lists standard 8 by 8 by 16 concrete masonry units. What actual unit size should the estimator use when allowing for a 3/8 in. mortar joint?
Correct Answer
A) 7-5/8 in. by 7-5/8 in. by 15-5/8 in.
A standard nominal 8 by 8 by 16 CMU has actual dimensions 7-5/8 in. by 7-5/8 in. by 15-5/8 in., leaving room for 3/8 in. mortar joints. Other choices: the nominal size includes joints, 7-1/2 in. dimensions do not match standard modular CMU, and mixing nominal length with actual height is inconsistent.
Why This Is the Correct Answer
A standard nominal 8 by 8 by 16 CMU has actual dimensions 7-5/8 in. by 7-5/8 in. by 15-5/8 in., leaving room for 3/8 in. mortar joints. Other choices: the nominal size includes joints, 7-1/2 in. dimensions do not match standard modular CMU, and mixing nominal length with actual height is inconsistent.
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