Framing & StructuralQuestion 374 of 700
CALCULATION: Two stair carriages (stringers) are each cut from a 2x12 that is 14 feet long. Using nominal dimensions, how many total board feet of lumber is that?
a.28 board feet
b.42 board feet
c.56 board feet
d.21 board feet
Explanation
Board feet per piece = (nominal thickness in inches x nominal width in inches x length in feet) / 12 = (2 x 12 x 14) / 12 = 28 board feet each. Two stringers = 2 x 28 = 56 board feet. 28 counts only one piece, 42 and 21 use the wrong figures.
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