I need to run a toilet drain (3”) through three joists (9 1/4”). Code states holes in joists can not exceed 1/3 the size of the joists. Catch is for 3” pipe I need a 3 5/8” hole — which is larger than 1/3 the height of the joist.
Now what? I assume I could reinforce the joist? But I can’t find any specific info on this. Is there an official way to handle this?
EDIT: one workaround I’m seeing is that I could instead drop below these joists in a closet...which would reduce the height of the closet but maybe the best option?