New toilet plumbing

[mason honaker]

I am adding an upstairs master bath in a small room connected to the master bedroom. There is a wet-wall containing plumbing for an existing upstairs bath and existing downstairs bath. The existing upstairs and downstairs toilets each have their own wastepipes to the main drain in the crawlspace. Can a new toilet connection be added to the vented vertical wastewater pipe that serves the downstaires toilet or would this be a no-no? If not, can a 2-way toilet arrangement (one on each side of the wet-wall) be installed on the vented upstairs vertical wastepipe?

[devidmikeParticipant]

If you want to stay compliant to your building codes, no. If you don’t care about code violations (may be an issue if you ever sell your house) then go ahead, it will work just fine. Just remember the plumbers 3 important rules: Brown trout don’t swim upstream, don’t bite your fingernails and payday is on Friday.

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[DUNBARParticipant]

MICHAEL55 wrote:

I am adding an upstairs master bath in a small room connected to the master bedroom. There is a wet-wall containing plumbing for an existing upstairs bath and existing downstairs bath. The existing upstairs and downstairs toilets each have their own wastepipes to the main drain in the crawlspace. Can a new toilet connection be added to the vented vertical wastewater pipe that serves the downstaires toilet or would this be a no-no? If not, can a 2-way toilet arrangement (one on each side of the wet-wall) be installed on the vented upstairs vertical wastepipe?

You’ll be asking for problems if you go with draining that toilet over the other two. In KY that would be considered an illegal wet vent for sure.

I would properly vent that toilet according to local code and then connect that toilet to your drain system after those other two toilets, having the best scenario possible for the situation.

[Author]

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