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Is it supporting one floor or two? What about an attic? What is the joist length on each side of the beam?
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Ok. Let me run the numbers on that.
That beam is undersized
It will work at 13'-5" only if it's southern pine no. 2. How much it's over otherwise depends on the species and grade. For something like Doug-fir no. 2, it's over by approximately 25%.