A 20-foot by 18-foot room needs subfloor panels. Using 4-foot by 8-foot panels, how many panels are needed before waste?
Correct Answer
B) 12 panels.
The floor area is 360 square feet. Each 4-foot by 8-foot panel is 32 square feet, so 360 / 32 = 11.25 and 12 panels are needed.
Why This Is the Correct Answer
The floor area is 360 square feet. Each 4-foot by 8-foot panel is 32 square feet, so 360 / 32 = 11.25 and 12 panels are needed.
Why the Other Options Are Wrong
Option A: 10 panels total.
10 panels total. is below the supported result for subfloor quantity calculation; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 14 panels total.
14 panels total. is above the supported result for subfloor quantity calculation; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 16 panels total.
16 panels total. is above the supported result for subfloor quantity calculation; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Estimating Sheathing takeoff: count the condition before counting the package.
Reference Hint
Study anchor (closed-book): memorize Subfloor quantity calculation from California Residential Code, California Code of Regulations Title 24. / Title 24 California Residential Code floor sheathing quantity concepts; know the rule or calculation trigger without relying on exam-room lookup.
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