I had a full basement roughed in, they added a AAV (Oatey) to the vent stack. If I am adding a toilet, sink and shower can I use the AAV only? The actual vent is about 50' away on the other side of the house. Please take a look at the picture.

Can you clarify something, if you have a vent stack why do you need or want an AAV? AAV are used when you don't have a vent stack close enough to a fixture

Hi guys...

You could use one AAV for the entire bathroom but you'll still need to run the bathroom vents and then connect them into the 2" vent stack with the AAV.

You'll need to run the vent at 42" or so and then connect into the vent stack at about 48" off the finish floor. The AAV must be at the high point... usually associated with the sink. The AAV must be accessible through an access panel or set in a wall that is accessible from behind so you change the AAV out if/when needed.

I think I know what each pipe is in the picture above, but can you confirm which is for the sink and which is for the tub?

I can probably draw something up, but want you to confirm which pipe is which, OK?

Back to you...

Mark

Thanks for the responses!

OK, ballengerb1, The AAV is already on what I believe I can leave as the vent stack. It is the pipe with the white cap in the back (and the highest pipe coming out of the floor). I guess I was asking is if I could just leave that as my vent and not connect it to a real piped vent because the actual vent is 40+ feet away.

massplumber2008, that's what I was wondering, do I still need to run the vent with the AAV. I was hoping I could not vent and rely only on the AAV. The AAV in my design will be under the vanity. As for each pipe, I believe this is the order from the far wall and the white cal AAV:

Vent (with AAV)- this will hide under vanity
Toilet drain - this is where I will hide
Sink drain - I think it's the sink drain, I will run it in the studs to the vanity where the AAV is, if not is the this vent and I should take the AAV off and use that pipe as the drain for the sink?
Black box is the shower drain - obvious.


I will upload the crude image to you shortly.

Sorry, cannot figure out how to add another picture

This may work though
http://gallery.me.com/dominak/100044/Sewar%20diag

http://gallery.me.com/dominak/100044/Sewar%20diag

Hi Dominack...

Without knowing how this was piped underground I can only guess at what is supposed to happen here, but when I put it all together and use space in a way I think fits this best I see it laying out pretty nice as seen below.

I think you could come up with other arrangements as well and use what I set up as a shower vent as a sink drain... both ways would work. Here, as long as the drain/vents connect together as drawn in black (reverse AAV if sink drain and shower vent are swapped) you can use the one AAV to vent the entire bathroom. You could probably also just install another AAV at the shower vent as long as you keep it "readily accessible" and you wouldn't even have to connect the vents together as drawn!!

The green square in the drawing is a 2" clean out. Put one there facing away from the shower and another at the sink drain/vent right before it goes into the ground (behind toilet...facing away from the bathroom where it can be accessed in the future if the studs go in as I drew up).

If you do use only one AAV then the vent fitting is inverted as drawn. The sink drain fitting is a 2"x1.5" sanitary tee fitting. The shower vent pitches at 1/8" per foot of pipe back toward the drain. Secure the pipe every 4 feet.

The toilet drain wants to end up at 12" to the center of the drain pipe off the ROUGH STUD face for normal toilets. This leaves a fit of 11.5" for setting the toilet at finish which usually ends with only 1" between the toilet tank and the finish wall. Do not try to get tighter as some toilets are a tight fit.

Hopefully, in the drawing you get the idea of vents and fixture placement for this job. As I said, you can play with other layouts as well.

Don't forget to install a large bathroom exhaust fan with a heater fan if you live in a cold climate. You will thank me later... ;)

Back to you...

Mark

Mark,

Thanks for the detailed info! I had that as a similar layout, but moved the toilet to the wall and the sink to the left of it opposite of the shower. It will work, I'll run the vent back to the wall and the sink drain down and tie it all into the shower vent. Does that make sense? Any chance you could sketch it out or review my idea?

Take a look at this picture...
http://gallery.me.com/dominak#100044

All looked good!

With this layout I would just hook up the sink and install an AAV under the sink and then install another AAV at the shower vent... install 2 90s to bring the shower vent AAV to an accessible spot, say near the waste stack with the cleanout and either install an access panel there or if the wall will be kept open all set there.

No need to connect the vents this way... not bad, huh?

Mark

Thanks I was wondering if I could get away with just the AAV. I will have access to the shower AAV, it will be in the little bump out behind the shower and I will have access in through the closet that backs up the shower