Originally Posted by
Tim Moreira
The real question is, what is the size of the lag bolt and it's sheer strength? Also what is the dead load of that floor?
I would say that one bolt would be a little lite. It may be adequate for the load it is supporting but I would like to see a minimum of two.
I think this is a question that need more engineering info to answer.
Forget the lag bolt.
It needs a through bolt.
That said, it also needs (as others have said) an engineer to design appropriate repairs.
You could do what the framer did, but with a large piece, through bolted with an adequate number (probably two, maybe three) bolts, staggered vertically, and top it with another piece extending across the top of it all (maybe even a steel plate). It can be done similar to that, but, the critical aspect is having someone design it who can back up their design ...
The structural engineer.