A CMU takeoff shows 3,450 sf after openings. One unit covers 1.125 sf and 3% waste is carried. How many blocks should be estimated?
Correct Answer
B) 3,159 blocks
Divide net wall area by coverage and add waste.
Why This Is the Correct Answer
Divide net wall area by coverage and add waste.
Why the Other Options Are Wrong
Option A: 3,067 blocks
3,067 blocks is below the supported result for cmu block count; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 3,263 blocks
3,263 blocks is above the supported result for cmu block count; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 3,450 blocks
3,450 blocks is above the supported result for cmu block count; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Measure to divide, adjust for net, then let Levels Masonry set the finish line.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 11th Edition, 2024 to Masonry estimating; CMU coverage and waste; verify the quantity, Florida notice/permit rule, or field-control record before answering.
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