Just to jump in on this thread.... I wouldn't worry about the deflection for this area. Just keep the boxed in area as small as possible. The cut joist in a properly boxed in area will be well supported by the two joists it is tied to. It is a bit heady to think about it but seems to me that the cut joist would actually gain strength since its span does not run the entire length...but the joists to which it is connected would gain load by the headers tied to it since they would have to carry the load of the cut joists. I have added 2 x 4's (blocking) around pipes to support the floor which was no longer supported by the joist which was cut..... maybe all this makes sense...
As for the pipe size... you'll need to cut out that tee the trap is connected to and replace it with a tee for the 2" drain.
As for the pipe size... you'll need to cut out that tee the trap is connected to and replace it with a tee for the 2" drain.
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