I am installing a shower in our downstairs bathroom in which I cut into our laundry room as to save bathroom space. My options on running the drains are 1. cut the bathroom floor out and tie in to the sink drain (the sink is located next to the toilet). Not knowing exactly where the pipes are could be an issue. 2. cut out floor in my laundry room and tie into washing machine drain(not sure how it is vented). 3. cut out laundry room floor and tie into the main drain that drains into an ejector pump. Any information would be appreciated.
Thank you dave

Unless you plan on running a separate vent for the shower I would go with door#1. If you connect to the lavatory drain the shower will be wet vented. If the washer were vented that would work also but you stand a good chance of having the washer pump the washer directly into the lower shower floor.
Your best bet is the lavatory drain. Good luck, Tom

Thank you for the advice. I did forget one other option. Could I run a separate drain line to the ejector pump basin itself. I am just trying to weigh my options. I see what your saying about the washing machine drain. Is tapping in to the drain line close to the ejector pump out of the question? Thanks again dave

Is tapping in to the drain line close to the ejector pump out of the question?

Not if you plan on running a separate vent for the shower. Code MANDATES that every fixture that has a trap MUST be vented. Regards, Tom

Is tapping in to the drain line close to the ejector pump out of the question?

Not if you plan on running a separate vent for the shower. Code MANDATES that every fixture that has a trap MUST be vented. Regards, Tom

Tom, if I use this option, can I tap into the vent into the vent pipe that comes out of the ejection pump and if not how do I know if I'm allowed to use the aav. And if I can use one where can they be purchased from. Tapping into any other vents or running a new vent out the roof isn't going to be possible. I just wanted to find this out before I started ripping up the concrete. Thanks again
Dave

"can i tap into the vent into the vent pipe that comes out of the ejection pump?" NO! This is a dedicated vent for the pit.

"how do i know if i'm allowed to use the aav?" Ask the plumbing inspector. Your best bet is to tie to the lavatory drain line and let the lavatory wet vent it. Regards, tom

Tom,
I took your advice and cut the concrete out to tie into the lavatory drain. I have the drainpipe exposed but it is only 1 1/2 inch pipe. From the location I am going to connect it to where it appears to tie into the main drain line off the toilet is only about 16". Is that acceptable to tap into the 1 1/2 line ? And if so should i run 2" off the shower as far as I can before reducing down? And one last question with tying in to the lavatory drain line to wet vent the shower does the shower still need a trap installed.
Thank you very much for the input and help.
Dave

tom,
I took your advice and cut the concrete out to tie into the lavatory drain. I have the drainpipe exposed but it is only 1 1/2 inch pipe. from the location i am going to connect it to where it appears to tie into the main drain line off the toilet is only about 16". Is that acceptable to tap into the 1 1/2 line ? And if so should i run 2" off the shower as far as i can before reducing down? And one last question with tying in to the lavatory drain line to wet vent the shower does the shower still need a trap installed.
Thank you very much for the input and help.
Dave
Hey Dave,

Since most shower drains are 2 inch I would run 2" over and connect to the lavatory drain using a DWV 1 1/2 X 1 1/2 X 2" Tee.

Yes, the shower will need its own trap. If it's not trapped then you leave a direct open connection between your home and the sewer. Regards, Tom