The other choices include spruce which is actually the spruce-pine-fir category, and the engineered I-joist. The beam calculations provided by this online tool are for educational and illustrative purposes only. 2 pine is the the most common so the field is pre-selected at that. For example if a room is 10′ inside to inside and the joists are cut 10′ 7″ so they will bear fully on both walls, then the span will be 10′. Double check yourself with these span charts. This will be slightly less than the length of the board. Calculate the size needed for a beam, girder, or header made from No. Most lay outs are on 16″ so the field is pre-selected.
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