Basement Bathroom Wet Vent

Hi, I have drains roughed in for my basement and there is a 2" stub next to the 1.5" vanity drain stub - I was told this was a wet vent for the bathroom since there was no way to vent the drains outside - how do I connect this? Do I tie it directly to the vanity drain, or do I use an AAV under the vanity?

Thanks!

Normally the 2" would be the vent for the toilet, and it would be run through the roof.
Are you sure there isn't a 2" that is capped in the ceiling that it is supposed to connect to?

Terry said:

Normally the 2" would be the vent for the toilet, and it would be run through the roof.
Are you sure there isn't a 2" that is capped in the ceiling that it is supposed to connect to?

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thanks for helping Terry!

No, there's nothing capped at all - it's entirely unfinished so I'd be able to see if there was, and as well I've opened up the wall directly above and there's no vent line to the roof to be had...

If you have a laundry room with a laundry sink in your basement, I could almost guarentee that you have some sort of vent in your basement

The 2" stub is the wet vent for your toilet. In the same 2" stub, your Basin/sink will drain. The 1.5" stub is a vent for your bathtub or shower (it is only a vent. IT IS NOT A DRAIN)

Just curious How old is your home?

krow said:

If you have a laundry room with a laundry sink in your basement, I could almost guarentee that you have some sort of vent in your basement

The 2" stub is the wet vent for your toilet. In the same 2" stub, your Basin/sink will drain. The 1.2" stub is a vent for your bathtub or shower (it is only a vent. IT IS NOT A DRAIN)

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Hi Krow,

we don't have a laundry sink (and laundry machines are at the far end of the basement...) I've never found a vent other than the main stack... Hard to know what's lurking in a 100 year old house though...

So do I connect the sink to the 2" wet vent and put an AAV on the 1.25" vent?

Thanks

First I want to make it clear that I am not a big fan of AVV,s.

Second, the AVV's ARE NOT supposed to be used in any toilet applications, but they are allowed for the sake of one or 2 fixtures (toilet not being one of them)

Those 2 pipes connect together at the proper hieght to make one 1.5" vent to deal with. That single pipe is suppose d to be vented to the outside of the house. I know the 100 + year homes are a PITA to deal with in Toronto. The best you could do and still be code compliant, is to send a vent to the basement from an already existing fixture set up from the upper floor. Or send a pipe to the exterior wall of the basement and send a pipe along side the house outside to the height of the roof.

The toilet will not work properly with the AVV installed. It will manifest itself as a plugged toilet. You will not be happy

A pic of the stubs would shed some light of your rough-in

So there's a floor drain in the middle, the vent and wet vent stubs in the middle, toilet flange on the right hand side, and cutoff from the shot is the tub drain on the left

The floor drain the bathroom is not in the diagram. In my opinion, it shouldn't even be there. The vent will extend to the exterior of your home, in some fashion