A beam infill package includes twenty-four nominal 2x10 members, each 16 ft long. Using board-foot measure, what lumber quantity is represented?
Correct Answer
A) 640 bf
Board feet for one member are 2 x 10 x 16 / 12 = 26.67 bf. For 24 members, 26.67 x 24 = 640 bf. Other choices use the dressed size, fewer pieces, or a shorter length.
Why This Is the Correct Answer
Board feet for one member are 2 x 10 x 16 / 12 = 26.67 bf. For 24 members, 26.67 x 24 = 640 bf. Other choices use the dressed size, fewer pieces, or a shorter length.
Why the Other Options Are Wrong
Option B: 480 bf
board feet, choice a: 480 bf backs into 18 when divided by 26.67; the accepted setup gives 24 on that same base.
Option C: 560 bf
board feet, choice b: 560 bf backs into 21 when divided by 26.67; the accepted setup gives 24 on that same base.
Option D: 600 bf
board feet, choice c: 600 bf backs into 25 when divided by 24; the accepted setup gives 26.67 on that same base.
Memory Technique
Store board feet with its last math move; nearby answers are usually unfinished versions of 640 bf.
Reference Hint
Open Carpentry and Building Construction, 2016; use the index entry or section for "Board-foot lumber quantity calculation" to confirm that Board feet for one member are 2 x 10 x 16 / 12 = 26.67 bf.
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