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Old 12-08-2009, 11:11 AM   #1
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New basement bathroom vents


I'm adding a bathroom in my basement. The house was studded in for the bathroom when it was built about 5 years ago. The picture below should shed some light onto the subject.

In the picture, the 5 gal bucket emersed in concrete is for the tub drain, next to it the toilet drain. In the wall you'll notice the backside of the laundry hookups on the other side of the wall. You can't see it in the picture, but one stud over from the vertical vent pipe is a metal duct for the dryer vent.

I need to put a sink on the wall down from the toilet, and want to know if the drain can attach to the same stack as the laundry drain just above where it turns vertical without causing any venting issues. I presume I will need to "re-vent" the sink drain to the vent somewhere overhead. This vent is a 2" pipe, which I suppose is the vent for the whole setup. Is this sufficent? The sump (located in the garage behind the wall behind the tub) is also vented with what I believe is a larger pipe, maybe 2-1/2".

Any help is greatly appreciated.

-J
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Old 12-08-2009, 11:37 AM   #2
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New basement bathroom vents


I'm a carpenter, so I'll let the plumbing experts chime in...

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Old 12-08-2009, 01:41 PM   #3
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New basement bathroom vents


It's allowed here in MA as long as the waste arms that dump into the stack are no greater than 10" apart center to center. It's called a "miscellaneous common vent". There's another rule to follow for this type of venting, but I think you're fine as is (again this is MA plumbing code - you'd have to find out what's allowed in your neck of the woods.)

You can also run an 1 1/2" waste arm 5 feet between the trap and the vent before re-venting is necessary.

The thing that wouldn't pass MA plumbing code is: Here, you're not allowed to use a laundry to "wet vent" any other fixtures, so the installation as seen in your picture would fail an inspection. Maybe it's allowed in GA. I think the reasoning is that suds can fill the pipe (below the tee) and block air flow through the vent leaving the other fixtures (the toilet and tub, in your case) unvented.

Last edited by Ishmael; 12-08-2009 at 01:44 PM.
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Old 12-10-2009, 06:38 PM   #4
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New basement bathroom vents


Thanks Ishmael,
After reading several posts about codes on here and then examining how my house was built (2004), I'm beginning to get the idea that codes are fairly loosely enforced in these parts. That or the builder had a "good" relationship with the inspector...guess I'll find out when I start working with him during the remodel process.

Kidding aside, anyone in GA know if the wet-vent is allowed for the laundry?

Thanks a bunch
-J
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Old 12-10-2009, 06:56 PM   #5
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Call your local plumbing inspector...from a pay phone.
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