At the airport rental-car counter, during the material-order review, the two-sided wall line requires 88 LF of stem-wall forms at 3.5 ft high on 2 sides. What contact area is required?
Correct Answer
D) 616 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: 308 SF
308 SF is below the supported result for stem-wall forms; it likely omits allowance, conversion, coverage, or final round-up.
Option B: 176 SF
176 SF is below the supported result for stem-wall forms; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 770 SF
770 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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