For the crew-release check at the water-treatment control room, the two-sided wall line requires 216 LF of stem-wall forms at 3.5 ft high on 2 sides. What contact area is required?
Correct Answer
B) 1,512 SF
Form contact area equals length times height times the number of formed sides.
Why This Is the Correct Answer
Form contact area equals length times height times the number of formed sides.
Why the Other Options Are Wrong
Option A: 756 SF
756 SF is below the supported result for stem-wall forms; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 432 SF
432 SF is below the supported result for stem-wall forms; it likely omits allowance, conversion, coverage, or final round-up.
Option D: 1,890 SF
1,890 SF is above the supported result for stem-wall forms; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Stem-Wall Forms cart for Concrete Foreman: form first, contact second, whole sf last.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 10th Edition to Concrete formwork; contact area estimating; verify the construction method, material quantity, equipment use, unit conversion, or field-control calculation.
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