Determine the purchase quantity and number of board feet of 2 × 12 needed to construct the girder in Figure 14.61. The foundation walls are 8 inches thick and the bearing distance for the girder is 6 inches.
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The number of board feet is found as follows:
Inside dimension (ft) = 40? – 8? – 8? = 38?8?
Girder length (ft) = 38?8? + 6? + 6? = 39?8?
Total length of girder (ft) = 3 × 39?8? = 119?
Order 9 pieces of 2 × 12 @ 14? so joints break over columns
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