Can I pass a sink drain pipe through a 12×12 wooden support beam in the basement?
I want to install a sink on one side of the support beam (on the floor above) and the main drain is on the other side of the support beam (in the basement). I can’t pass it above the beam because it is the middle of the hallway. If I pass it under, it will be so low that we will have to bend to pass under the drain pipe. Is it acceptable to drill a 1 1/2″ hole through a 12″ x 12″ support beam. I have seen that the diameter of a hole should be maximum 1/4 the height of a joist, but does that apply to a support beam?
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