Hi all - I am in the planning stage of finishing my basement and would appreciate some feedback on the plumbing.
I don’t have much experience (yet, still in my 20s!) with plumbing but I need to get an idea on how I can design and frame this bathroom with what is in place. Help on identifying which piping is meant to handle toilet/shower/sink would be awesome.

The pipe in the far right corner has an outside cap diameter of 4.5”. I couldn’t get the cap off to measure, looked bigger than 3” though. All the rest are 2” and 3”.

I’ll do my best answering all questions. Would love to know everyone's guess at what their vision was when installing the plumbing.

Attachment 49285

The 4" pipe is definitely the toilet drain (see image).

I believe the lavatory drain is that 2" pipe next to the 3" waste stack coming out of the floor. This drain would pick up the lavatory drain and then run 2" full size to pick up the shower vent.

To be sure the 2" pipe I marked as a shower drain is the shower drain you'll need to uncap the 2 drain lines and pour water into the pipes. The pipe that has standing water in the drain after pouring the water into the pipes is the shower drain (the PTRAP should be underground and will hold water).

After receiving the lavatory toilet/lavatory vent the shower vent will continue full size and connect onto the FUTURE VENT (find pipe in ceiling marked FV) and vent work should be finished.

Let me know what you think...

Mark

Mark,

Thanks for your response. There is a vent and water lines stubbed in the ceiling (behind me in the first picture) that I can plumb to all of these rough ins pretty easily. EDIT - This is NOT a vent and water lines.

I have attached a sketch of what I would like to do as well as a description below. Let me know what you think.

Left to Right

Large pipe against wall = Sink for wet bar
Small pipe by framed section = Shower drain
Small pipe by framed section = ???? ideas on what to do with this? save for other side of wall?
Large pipe set away from wall = toilet
Small pipe set away from wall = bathroom sink

Mark,

Your answer identifying the shower drain and the vent helped me a lot. I am hoping to use the 3" to the far left as a wet bar drain.

Any chance you can post a diagram of how the venting should be set up.

Thanks again for your help!

I just don't have time for that right now. I'd consult a local plumber on this and don't forget to confirm the shower drain has a ptrap under the floor.

Mark