While preparing the preconstruction estimate lock for the municipal pump-house slab, the exposed beam run requires 416 LF of grade-beam forms at 2.5 ft high on 2 sides. What contact area is required?
Correct Answer
A) 2,080 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 B: 1,040 SF
1,040 SF is below the supported result for grade-beam forms; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 832 SF
832 SF is below the supported result for grade-beam forms; it likely omits allowance, conversion, coverage, or final round-up.
Option D: 2,600 SF
2,600 SF is above the supported result for grade-beam forms; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Measure to form, adjust for contact, then let Concrete Foreman set the finish line.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 10th Edition to Concrete formwork; beam side forms; verify the construction method, material quantity, equipment use, unit conversion, or field-control calculation.
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