Determine the purchase quantity and number of board feet of 2 × 12 joist needed for the floor in Figure 14.62. The joists are spaced 16 inches on center. Be sure to include the headers.
What will be an ideal response?
Determine the number of joist spaces for bottom and middle row of joists:
Number of joist spaces = 36? × 0.75 spaces per foot = 27 spaces
Add 1 to get the number of joist – Use 28 joists. Determine the number of joist spaces for the top row of joists:
Number of joist spaces = 13?4? × 0.75 spaces per foot = 10 spaces
Add 1 to get the number of joist – Use 11 joists.
Bottom row of joists: 2 @ 10?, 26 @ 12?
Middle row of joists: 1 @ 12? (cut in half), 26 @ 12?
Top row of joists: 11 @ 10?
Doubled joists: 2 @ 10?, 8 @ 12?
Joist headers at top: 2 @ 12?, 1 @ 14?
Joist headers at bottom: 3 @ 12?
Joist headers at opening: 1 @ 8? (cut in half)
The total counts are as follows:
1 pieces 2 × 12 @ 14?
66 pieces 2 × 12 @ 12?
15 pieces 2 × 12 @ 10?
1 pieces 2 × 12 @ 8?
Joist length (ft) = 1 × 14? + 66 × 12? + 15 × 10? + 1 × 8? = 964?
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