In Florida the tie beam need 4 #5s, there is one in each doweled cell (corners, both sides of any window or door and every 4' on a running wall) and 2 in the footer. These are all wire tied together to make a matrix.
If the beam is load bearing, you may have four #7s and two #5s. Every one of them is part of the engineered assembly and cutting one is about like cutting truss chords.


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Greg Fretwell