I am thinking about installing a basement wet bar w/ sink. There is a main sewer line coming from upstairs, going straight into the cement (has a cleanout about 2.5 ft above floor). The location I am looking to install the sink will be roughly 36 ft from this main swere line, with two 90 degree turns. I am assuming 1/4" drop per ft. of drain line off the sink to the sewer main. My question is concerning the tie-in to the sewer main. How simple / or not so simple is this? Would I run the pipe from the sink to the sewer main using the 1/4"/ft. drop in my run, and then go into the sewer main at a 45 degree angle? I am concerned about not backing up my basement sink off the sewer main.

I notice you haven't mentioned a vent off the bar sink, (every fixture having a trap MUST be vented). Figure 18" off the floor to pick up the bar sink and a 9" drop at 1/4" to the foot which will leave you a 9" drop to the floor line. How did you plan on connecting to the sewer? If you have a floor drain in the basement then a back up will come out the floor drain and not your wet bar. Good luck, Tom

What is usually done to tie in to the sewer main?

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Originally Posted by KGF

What is usually done to tie in to the sewer main?

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Cut in and roll a combination wye and eighth bend up on a 45 degree angle from the main and 45 down to it from the drain line. Good luck, Tom