A CMU wall requires 8-inch blocks with Type S mortar. The wall is 100 feet long and 12 feet high. Assuming standard 8×8×16 inch blocks, approximately how many blocks are needed? (Account for 3/8-inch mortar joints)
Correct Answer
C) 1,080 blocks
Wall area = 100 ft × 12 ft = 1,200 sq ft. Each block covers (16 + 3/8) × (8 + 3/8) = 16.375 × 8.375 = 137.14 sq in = 0.952 sq ft. Blocks needed = 1,200 ÷ 0.952 = 1,261 blocks. Answer B is closest.
Why This Is the Correct Answer
Wall area = 100 ft × 12 ft = 1,200 sq ft. Each block covers (16 + 3/8) × (8 + 3/8) = 16.375 × 8.375 = 137.14 sq in = 0.952 sq ft. Blocks needed = 1,200 ÷ 0.952 = 1,261 blocks. Answer B is closest.
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