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1-4. Depth

When the depth of a girder is doubled, the safe load is increased four times. For example, a girder that is 3 inches wide and 12 inches deep will carry four times as much weight as a girder 3 inches wide and 6 inches deep. To obtain greater carrying capacity, it is better to increase the depth than to increase the width of the girder. The sizes of built-up wood girders for various loads and spans may be determined by using Table 1-1 .

Table 1-1. Sizes of built-up wood girders

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