What are the nominal dimensions for an 8-inch CMU block?

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Multiple Choice

What are the nominal dimensions for an 8-inch CMU block?

Explanation:
In masonry, nominal dimensions are the numbers used in plans and specs to describe standard block sizes, not the exact measured size after mortar is added. For a standard CMU block, the block is 8 inches tall, 8 inches wide (thickness), and 16 inches long in nominal terms. The actual dimensions are just a bit smaller—about 7 5/8 inches by 7 5/8 inches by 15 5/8 inches—because mortar takes up space. So the 8x8x16 combination matches the standard nominal size used in drawings and specifications. The other options would imply a different length (12 inches), a different cross-section (8x8x8 would be cube-like, not a standard CMU), or a thinner width (8x6x16).

In masonry, nominal dimensions are the numbers used in plans and specs to describe standard block sizes, not the exact measured size after mortar is added. For a standard CMU block, the block is 8 inches tall, 8 inches wide (thickness), and 16 inches long in nominal terms. The actual dimensions are just a bit smaller—about 7 5/8 inches by 7 5/8 inches by 15 5/8 inches—because mortar takes up space.

So the 8x8x16 combination matches the standard nominal size used in drawings and specifications. The other options would imply a different length (12 inches), a different cross-section (8x8x8 would be cube-like, not a standard CMU), or a thinner width (8x6x16).

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