basement bathroom rough in - framing questions
Where do I start...
First, I envy you for having a nice little project there. I'm kind of jambed up with redoing some fiberglass insulation in my garage right now. My hot tub surround has to wait until warmer weather.
Next, it looks like whoever built the house did you a sort of favor by roughing in the drains. It would have been nice to know what they were thinking, though. There are minimum clearances for plumbing fixtures, and max distances to the vent, and rules on what can go where, and rules for size pipe can be used for different fixtures and their associated vents. Do you have a drawing of what's under the slab? Or a drawing of what you want?
I'm thinking the drain in the floor is for the toilet. Nobody really stubs up a toilet drain like that above a slab, at least around here, because there's no way to get the flange on and level it to the flooring. Plus you said that stub up was 4 inch, where for a residential toilet, only 3 inch drain size is needed. And that's another question - you know the OD for 3 inch IPS pipe is 3.5", and OD for 4 inch IPS pipe is 4.5", right?
Back to the flange. When we rough in drains under slabs, we box out the area so there's a concrete-free hole in the slab. (I see a messier version of that in your floor.) Then when it comes time to finish, we can set the flange height and pour in the last slug of bag mix concrete or hydraulic cement our selves. So if the one in the floor is for the toilet (which for residential only has to be 3 inch in my neck of the woods), you have room to set a toilet flange. Then there should be a 2" vent coming off the drain line downstream of the toilet, no more than 6 feet away, which might be that stub coming up, but that's a pretty large vent if it's 4 inch like you say. And a shower drain only has to be 2". Maybe it's a cleanout? Really hard to tell.
And I'm not sure what the other end of that room is. Looks like 3 inch with 1-1/4" fixture fitting, which is good for a bathroom sink. But there are two. Any other type of sink should be 2".
In a nut shell, check before you install the toilet. It's illegal to install a shower or anything else upstream of a toilet drain. Plus you need vents per code.
I hate to say it, but I'd have to walk around your basement to figure out what's what. The house looks new. There has to be something somewhere that tells you why they installed that. Check with the town when you pull your permit, or ask the inspector. He may even remember either who did or what's there under the slab. And there might be drawings in your home's file. My first house was built in 1962, and my drawings were still in the file when I pulled my first permit.
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