Determine the purchase quantity and number of board feet of 2 × 12 needed to construct the girders in Figure 14.62. The foundation walls are 8 inches thick and the bearing distance for the girder is 6 inches.
What will be an ideal response?
Top girder is calculated as follows:
Inside dimension (ft) = 13?4? – 8? – 8? = 12?
Girder length (ft) = 12? + 6? + 6? = 13?
Order 2 at 14?. The bottom girder is calculated as follows:
Inside dimension (ft) = 36? – 4? – 8? = 31?4?
Girder length (ft) = 31?4? + 6? = 31?10?
Order 6 at 12? because of the post spacing.
Total length of girder (ft) = 2 × 14? + 6 × 12? = 100?
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