Help me understand venting in basement bathrooms

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Old 04-04-20, 11:33 AM
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Help me understand venting in basement bathrooms

Hi all! Just finished framing my 2200 sf basement and am starting the electric now. Was originally planning to hire the plumbing, but given the quarantine I've got time on my hands and am considering tackling it myself. Been reading up on roughing in, and one thing that confuses me is venting. The house was new construction 11 months ago, and we had it roughed in for two full bathrooms and a wet bar with a small sink. They left PEX stubs in the ceiling pretty close to every place that needs water, but venting I know nothing about. I'm including a link to some photos and hoping an expert can help me make sense of them.

From the very little research I've done, this is a "wet venting" situation where the bathroom sinks ("lav?") handle the venting up to capped stubs off PVC lines nearby. I count 3 of those up in the ceiling: one near the master bath (toilet, separate vanities, and separate tub and shower) and two near bathroom 2 and the ejector pit (which has a line running up the wall labeled "vent" that then splits off into those two stubs). Nothing near the wet bar.

All thoughts and advice appreciated, and no offense will be taken! Thanks!

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Last edited by Nick Abel; 04-04-20 at 11:53 AM.
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Old 04-07-20, 08:12 AM
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Just bumping this to see if anyone has input. I got a reply over the weekend on another forum indicating that I should vent the lavs to those capped PVC stubs above, and that if there's nothing near the bar it's likely included in the wet vent to the master bath via AAV under the concrete. Everyone agree with that general advice? Thanks again for any help!
 
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Old 04-07-20, 10:06 AM
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Sorry for missing your post the first time around. It sounds like it was well-roughed in to make the finishing reasonably easy. Each bathroom group typically needs one vent. As long as it's laid out normally, the toilet and shower/tub will vent through the vanity drain and up the wall to the roof vent.

The bar is likely planned to be vented with an AAV/Studor vent. Since it drops down, it can't vent through the bath vents. Vents only work horizontally and vertically. Since the bar will go through the p-trap ~18" above the floor, then drop under the floor, it will need some type of vent. But since it's a small sink, an AAV will probably be sufficient.
 
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Old 04-08-20, 08:55 AM
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if there's nothing near the bar it's likely included in the wet vent to the master bath via AAV under the concrete.
I am by no means a plumbing expert, but I don't need to be an expert to know an AAV cannot be installed under concrete. I believe before I relied on an AAV vent I'd check with the inspector to see if he even allows an AAV. I was always told they weren't allowed by code, but I have seen a few that I always assumed were installed with no permit. I cannot imagine a plumber roughing in a future bath and not installing the proper vents in the rough-in. Even a bar sink could be vented with a loop vent rather than an AAV.
 
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