A CMU wall area is 2,240 sf after openings. If one block covers 1.125 sf and 4% waste is included, how many blocks should be estimated?
Correct Answer
B) 2,071 blocks
Divide net wall area by block coverage and add waste.
Why This Is the Correct Answer
Divide net wall area by block coverage and add waste.
Why the Other Options Are Wrong
Option A: 1,991 blocks
1,991 blocks is below the supported result for cmu takeoff; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 2,150 blocks
2,150 blocks is above the supported result for cmu takeoff; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 2,240 blocks
2,240 blocks is above the supported result for cmu takeoff; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Measure to divide, adjust for net, then let Checks Masonry set the finish line.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 11th Edition, 2024 to Estimating and quantity takeoff; masonry unit coverage; match the role, timing, and required approval before choosing.
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