How to plumb basement sink drain?

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oldrover

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I'm finishing a bathroom in my basement, roughed in by builder 6 years ago. Did I plumb for the sink correctly? Thanks! :)
 

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Jadnashua

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Does the horizontal drain slope down to the vertical connection?
 

oldrover

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Yes. I sloped the pipe down to the vent. I was just concerned because I saw some pictures showing a loop configuration for a sink drain.
 

Dubldare

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Not legal where I'm from- too many offsets in horizontal trap arm. Maximum allowed 90° between trap and vent.
 

oldrover

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dubldare said:
Not legal where I'm from- too many offsets in horizontal trap arm. Maximum allowed 90° between trap and vent.

I'm sorry, I don't understand what you mean. I came straight off the vertical pipe and have a 90 at the end. What should I have done?

Thanks.
 

Dubldare

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It appears that between the vertical stack (where the tee is) and where the sink goes, you are offsetting 180 degrees (on the horizontal).

The tee is where the vent for the sink is.

If you would have drilled the studs and aimed the tee toward the 90 for the sink, you would be fine.
 

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oldrover

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Doh! :confused:
Thanks. Now I understand.
I did it that way because the wall was framed slightly out of square and I am ripping 2x4's to make that wall square. So, there isn't room to notch them. So, can I get by with this, or is there another way to do it?
Thanks. :)
 

oldrover

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One more try;
Is there a way to plumb this with the pipes going behind the wall as I've done? What about a loop to the vent? Is that what I need?
What would happen if I just left it the way it is? Would it still work ok?

Thanks...
 

oldrover

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I'm open to suggestions..
I can't go straight through the studs, because they will only be about 2 inches thick in that area.
 

Gary Swart

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How about making the entire wall wider. You could sister on to the 2x4 studs with 2x6s or even 2x8s and that would give you the room you need. Walls that have drain pipes usually have 2x6 studs.
 

oldrover

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Thanks for the suggestion!
I hadn't thought of using 2x6's. Sounds like a good idea!
Just to make sure I'm not screwing this all up, I have attached more photos to better represent my situation.
In order to make the tub fit correctly, and keeping the room square, I figured that I would need to rip some 2x4's to just barely enclose the vent pipe.
But, the toilet rough in will be 12 inches on center from the studs, so I have to get a 10" toilet, right?
I also have a standard tub at the end of the bath. That rough in seems to be ok. As you can see, I have already dug it out and attached the drainpipe to make sure it fits. (I am really paranoid about screwing this up!)
 

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Jadnashua

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When you add the 1/2" drywall, the 11.5" you have left will still allow some 12" toilets to fit...so, all is not lost, you just have to be more selective. The selection of 10" rough-ins isn't as big.
 
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