When sizing beams, you should stick with 2x6 to 2x12 members because:

When sizing beams, you should stick with 2x6 to 2x12 members because they are readily available and easy to handle. You may have to consider larger size members when spans exceed the lengths that 2x6 to 2x12 can handle. In addition, larger size members may be required to support the load carried by a beam.

The size of beams used in construction varies depending on the span, the weight of the load it is going to support, the species of lumber used, and the spacing between joists.Consequently, larger beams may be necessary to support larger loads or spans. Furthermore, larger beams may be necessary to support the load carried by a beam. Typically, 2x6 to 2x12 is the most commonly used beam size due to their availability and ease of handling.

In summary, it's recommended that you stick to 2x6 to 2x12 beam sizes when sizing beams due to their ease of handling and availability. Nevertheless, when spans exceed the lengths that 2x6 to 2x12 can handle, larger size members may be needed.

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