I have a second floor bathroom that has the typical tub, toilet and sink. Problem is there is no vent that I can see and the tub won't drain unless the toilet outake pipe is open (toilets removed). Sink seems OK, toilet and tub drain within a foot into the same line the sink is about 6 feet away and ties into the same drain line. So, it goes tub drain, tie in sink drain, tie in toilet drain (smaller pipe 1 1/2 brass I think for tub and sink-- and 3 inch PVC for toilet for sure) emptying into 4 inch PVC to CI.

Can I use an AAV to solve this problem? If so where do I tie it in after all the tie ins? My thought was to put it in the 3" pipe with a T-y; 1 1/2 inch vent.

Suggestions?

Thanks

The tub wont drain unless the toilet outake pipe is open (toilets removed). The tub's venting through the open toilet drain. First tell me what you have.
Does the sink drain go into the wall or the floor? How old is your house?
What material are the drain pipes and trap on the sink? Back to you, Tom

The sink goes first into the wall then must go down and runs under the floor.

House is 70 years old bathroom I think was put in in 1985 though.

Trap is pvc the drain is brass (could be copper but looks more like brass) I think.

This is a drawing of what I have


bathroom setup before vent on Flickr - Photo Sharing! (http://www.flickr.com/photos/50039121@N07/4647028481/)

You can add a AAV just downstream from the trap, (see image) and vent the entire bathroom group. Good luck, Tom

You can add a AAV just downstream from the trap, (see image) and vent the entire bathroom group. Good luck, Tom

I know it probably doesn't matter, but the only space there is to put an air vent in is where the sink t's into the system I can put a 4 way and go out the back and then up, how far above the floorline does the aav need to be?

The AAV's location isn't relative to the floor, it relates to the trap and must be above the trap.

The AAV's location isn't relative to the floor, it relates to the trap and must be above the trap.

Is there any minimum distance above the trap it needs to be?

Is there any minimum distance above the trap it needs to be?
If I had an choice I would raise it as high as I could from the trap. Why do you ask? Tom

If I had an choice I would raise it as high as I could from the trap. Why do you ask? Tom

Part of the problem is there is a hot water heater supplying the 2nd floor ba that sits directly over this whole configuration so the aav will need to be squeezed in behind it and around the supply pipes and such, so trying to gauge how far up it needs to go--what Ive read ranges from any distance above the trap to 30 inches above the trap.

This whole thing has come from the Mickey Mouse work done on this bath. I have supported the joists that were notched so badly in putting the drains in in the first place and are 24" on center, just a little wider than they should be huh? I have a 12 foot long beam (2x6 with 3/4 plywood between and another 2x6 bolted together spanning from one wall to another and put another support wall closet under it for added support, tore up the mostly rotted floor and replaced it withnew wood, 1/2 plywood, 1/4" plywood, tile backer board and reinforced 2x6 squares where the toilt sits and I would so rather not redo it again... lol.

I appreciate all your help... I think this should fix the problem (otherwise Im going to just seal myself in the wall).

Would it be possible to install a sanitary or vent tee between the trap and the wall, roll it on a 45 degree angle and then straighten up with a 45 to mount the AAV or is space simply too tight? Back to you, Tom

I am hoping this shows a little clearer the space situation, the first picture is from above and the second is from underneath, the third is what I was thinking would be the best option.

floor open-100_0684-cropped on Flickr - Photo Sharing! (http://www.flickr.com/photos/50039121@N07/4651116005/)

sub-floor from below100_0900 on Flickr - Photo Sharing! (http://www.flickr.com/photos/50039121@N07/4651780852/in/photostream/)

http://www.flickr.com/photos/50039121@N07/4651800760/

I am hoping that I can squeeze the AAV in the right top corner where the H2O heater sits, but it's a tight squeeze and I think to get there it will need a 4way cross to connect in tub/sink/drain and the AAV line--going back directly opposite the sink line the AAV line will go horizontal, then raise 90 degrees and go up as far as I can to the AAV... thoughts?

I am not sure I follow your comment above, though my gut reaction is probably no there isn't much space to go at 45 degrees anywhere in here...

Do the pictures give you any insights into If the plan I have is right?

My fingers are crossed.

Thanks

Do the pictures give you any insights into If the plan I have is right?
My fingers are crossed.
thx
I see several ways to install the AAV.
1) Cut a tee in the PVC drain line just in front of the heater and notch the heater platform, **OR**
2) Lay the tee on as 45 degree angle and line it up with a 45 over to the left. Notch the platform and bring the AAV up right next to the heater.
Good luck, Tom