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House has 2x10x12 joist 16"oc. I'd like to put some extra blocking around where the toilet goes.as you can see in the pic the toilet drain goes right up where a joist would go, and copper water lines run between the last joist and exterior wall. I was thinking of framing a box where the toilet goes, but would have to notch about 3" on the bottom to clear water lines if I use 2x10 to run perpendicular to the joists. It would run from wall through opening in first joist then end at the 2nd joist. There is blocking as you can see from wall to 1st joist, then another under the subfloor by the ladder that you cant see. Is this a good idea?