Determine the purchase quantity and number of board feet of 2 × 12 joist needed for the floor in Figure 14.61. The joists are spaced 16 inches on center. Be sure to include the headers.
What will be an ideal response?
The number of joists is found as follows:
Number of joist spaces = 40? × 0.75 spaces per foot = 30 spaces
Add 1 to get the number of joist – Use 31 joists. Order 31 pieces at 14? for the top of the drawing, 25 pieces (31 – 6) at 14? for the bottom of the drawing, and 6 pieces at 8? for between the opening and the center of the building. Order 4 additional at 14? for the double joists at the sides of the building, 3 additional joists at 14? for under the walls (one wall aligns with an existing joist), and 4 additional at 14? for the double joists at the sides of the opening. Order 8 pieces at 10? for the headers on top and bottom walls and 2 pieces at 8? for the header at the opening. The total counts are as follows:
67 pieces 2 × 12 @ 14?
8 pieces 2 × 12 @ 10?
8 pieces 2 × 12 @ 8?
Joist length (ft) = 67 × 14? + 8 × 10? + 8 × 8? = 1,082?
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