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Basement Bathroom rough in question

Posted by pmfleisch (My Page) on
Sat, Feb 23, 13 at 12:54


I'm a DIY'er wanting to start a basement bathroom project. I'm going to hire a plumber for permitting and final ok's, but want to start trenching to get the project going.

The bathroom will have a shower, lav and toilet. I also want to put in a new floor drain on the other side of the bathroom wall to replace the current floor drain that will be removed by my project.

There is a floor drain that I'm going to drain everything into (under grade). There are dry vents above the bathroom that I'm going to vent everything into.

Here's my questions...

1) Does my layout make sense? I think I'm doing it right, but the floor drain tied into the shower is a bit of a guess.

2) If the layout does work, do my sizes look ok?

3) How deep do all these things have to be? Is it just enough to keep a 1/4" per foot angle for drainage or is there a 6" under flood requirement?

4) Any other bits of wisdom would be appreciated.

Again, I'm not planning on doing this start to finish by myself, but I want to get things going. I've got a baby on the way and want to do what I can before I run out of time.

Thanks for your help.

This post was edited by pmfleisch on Sat, Feb 23, 13 at 14:47

Follow-Up Postings:

RE: Basement Bathroom rough in question

I suggest posting your questions and illustration on the Plumbing forum. Believe you'll get better expertise there.

Here's what I think will be recommended:

WC drain being 3". The new 5-litre toilets are coded for a smaller diameter drain in order to assure water actually washes everything clean.

Lav being 1.5", same logic.

I'll be following information you gather as I'm probably going to do similar next summer. Good luck.

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