Re: Waste through joists
I would advise checkin how many other holes are in the same joist that are near to where you are going to put your waste as not to weaken too much in one place.
If there are too many holes in then you can cut a lengh of 18mm pine ply 9" wide then glue and screw to the joist then drill your hole through the ply as well also brace between joists wi noggins ( as uug197h) said..
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