I'm looking to get some information regarding finishing my basement bathroom. It looks to me like there is only 2 drains. One is for the shower and the other is for the toilet. I'm a little perplexed on how to drain the sink. Here is the image:

This was before the basement concrete was poured. I now have a slab on top of the gravel.

Thanks for any help you all may be able to provide.



Edited 2 times.

No image, but you should have THREE pipes coming out of the floor.

Sorry about that. It's fixed now. Never posted a picture to a forum, now I know how.

Is the bigger pipe (3" or 4" around the shower drain a short piece of sleeve to allow the room for gluing in a shower drain assembly?

Is it possible the design was to add the lav drain with a trap arm off one of the vents?

Yes, the pipe is bigger by the shower drain. I'm not sure about adding the pipe into the vent. I'll have to ask my builder when he stops by.

If your "builder" is the one who installed the piping, I am not sure you should be asking him ANY plumbing questions.

It wasn't him directly, it was subcontracted out to a plumbing company. He has been building houses for 15-20 years, so I would certainly hope he has some idea about what the plumbers did.

I fired a plumbing inspector once because he did NOT know what he was doing. He told every one, " I have been a plumber for 30 years and that apprentice fired me?"

i believe they meant for the lav to drain into the tub vent. the location of that drain precludes using the majority of shower units. only a right hand drain tub will work with that drain location.

what was in the building contract signed by you and the contractor. Were all three appliances in the basement washroom specified?

Best Wishes

IT could drain into either vent depending on the sink's location.

According to the writing on the wall, a 36" lavatory goes to the right of the toilet. There may or may not be enough room, depending on how you frame the stud wall.

given that the vertical form lines in the foundation are 24 inches apart, i would guess a 30 inch vanity would fit to the right of the toilet and drain into the toilet vent.

Wheelchair,

I will have to check. I know he said rough in full bathroom. I'll double check our contract when I get home tonight.