Plumbing Bathroom in basement - help

**cheese1478** · 12-28-2009, 08:35 AM

I am installing a toilet and sink in my basement. There is an existing 3" drain pipe that ties to 2 other toilets upstairs. The pipe goes down my basement wall and under the concrete. I broke out the concrete and will tie my toilet into the 3" pipe (18" away). I will also tie my sink into the same 3" pipe prior to where it hits the concrete.

Is this OK? Also, do I have to run a separate vent or can I vent throug the 3" pipe? If I can use the existing 3" pipe do i need to tie into or just use my toilet connect as explained above. I can find any other vent pipe?

Thanks,

**johnjh2o1** · 12-28-2009, 08:47 AM

First you can not have three toilets on 3".
Second you do need a separate vent for the new 1/2 bath.

John

**cheese1478** · 12-28-2009, 09:23 AM

I now understand the 3 toilets on a 3" pipe is not code. Assuming I find a different pipe to tie into for the toilet what is the best method to vent the toilet and sink? Any guidance is very much appreciated.

**cacher_chick** · 12-28-2009, 06:06 PM

Any vent must terminate through the roof. If you connect to any existing vent it must be connected above the flood rim of the highest fixture on that vent.