This is the general idea but you want the AAV located higher.

 

It all wrong Water has to drop below the AAV above the trap.

 

Would that cause positive pressure?

 

I am not a plumber but I like answering questions.
I am guessing this is the reason we are not allowed to use S traps in my area.
Until a plumber gives you the correct answerer, I would get a P trap and attach it to the side of the T and run the vent off the top of T.
Or you could wait for a Plumber.
Edit: Sorry completely missed page 2

 

Is this like what you guys are talking about? The S trap would get turned into a P and I'd put a 90 curve on it to hook into the T pipe that is being moved up from the bottom. The AAV would go on top of the T joint. Where the old T joint was it'll just be a straight run up, correct? Will this solve my positive pressure problem?

 

Here is how I was thinking it should go... Any idea's?

 

This will work. It's what E-Plumber was suggesting.

 

The S-trap is the problem----look at the picture in post #17---do that and it will drain properly---

 

Can you please look at the picture on my post #34 and tell me if that is the case with what I proposed to do?

 

Get your drain snaked. Get rid of the S trap. Install a Sanitary tee with A P trap and AAV 6 inches directly above the tee.

 

only took 49 post do i hear 100 :confused1::lol:

 

For everyone's information S traps have been illegal to use for almost 34 years now. S traps have a bad habit of self siphoning and losing the water seal that is what keeps the evil sewer smell from entering your abode.

 

This old work has been there for probably over 40 years. Which would explain my post I did above.

 

Seen a lot of kitchen sinks that way from the era you state.
Your sink is still not vented or plumbed correctly (I didn't say the word code)

As i asked long ago and other plumbers have brought up- clean the line to improve flow, and install the tee above the P trap. By doing this, you will have eliminated unknowns(to you) and then you can move forward to more expensive and time consuming fixes- like putting the sink on your septic

 

That is something that was common then? To just vent a sink out into the lawn vs hooking it up to the septic? I see why they now require inspectors and things of that nature. I rent this house so I am not trying to do too much work to it. Only reason I did this was to hook up a dishwasher that he said he'd pay for. If it was my house I'd redo everything. Unless he wants to pay me I'm not going above and beyond just so the next tenant can enjoy it.

According to the plumber I talked to it's not going to magically make the positive pressure go away by installing the T above the trap. The positive pressure is most likely because it's not even going to the septic and is just drained right into the lawn.

 

 

Is it possible that I have positive pressure in the line and it's actually closing the AAV even more?

 

Just a guess. The Tee is allowing water to go back up the pipe with the AAV. That pressure is causing the AAV to close so water does not come out.

 

The AAV is above the trap though. Tech it should never even reach that far. Also, why would the sink completely drain the 2nd I remove it?

Thank you for the reply!

 

The water will not reach the AAV with your set up but it doesn't know it. Where the tee is you really need a wye so it directs the water down. The way it is now, some water can take a left and go up the AAV pipe. The water flows when you turn the AAV because you are breaking the vacuum.

 

I see what you are saying but I do not see how water would naturally go up the T. One the water is running down so it should tech skip right over the T, 2nd I have it angled so the water should continue going down the tub even if any got inside of it.

 

Take the pipe off that come out of the tee towards the AAV. Run your sink and see how much water comes out.

Since it's temporary it might be easier to unscrew the AAV when you need the sink vs investing a ton of time and parts.

 

I think you get a bit of bottleneck at the tee because of the different pipe diameters.

 

Ok I can confirm positive pressure.

I put a plastic bag over the pipe with the AAV off and the thing filled up like a balloon!

What would be causing positive pressure to that extent? Does anyone have idea's?

 

Why did you decide to add theaav in the first place- slow drain?

 

Yes because it was not properly vented. The only vent was a small copper piping coming out underneath the sink in the craw space. It didn't allow enough air to travel through it.

 

You have an S trap---that's bad--vent must be allow air in above the P=trap--

Remove all of your piping---start pipe at the floor---add a T- for a P-trap--
Then place the AAV above the T---

 

Can someone or yourself draw a diagram on how it should be set up? I'm not 100% sure on how this would help. The current AAV install is higher then the trap.

Would this current install cause positive pressure? Like I said before air is trying to come out of the AAV vs being sucked in. There is currently positive pressure. Would the way you described setting it up eliminate the positive pressure?

 

You need to put the vent where Mike and djlandkpl said- that is the proper location.

If you have drainage problems after that- you need to clean the line.

 

Is the current location of mine definitely causing the positive pressure? There doesn't seem to be a clog in the drain as the 2nd I unscrew it the drain flows very smoothly without ever backing up.

Thank you for the picture reference. I see what you guys are talking about. Any idea's on how to incorporate that into my current setup? Seems hard to do since it's a straight drop right after the trap.

 

Your diagram will work short term.

I'm not a pro but I think you still have an S trap if your trap comes up to the tee and drops immediately. E or Mike can verify.

 

http://www.diychatroom.com/f7/legal-198636/ This thread might clear it up for you. Only difference is I use real vent. start from #1

 

I don't mind having an S trap, I just want the AAV to work.

Can anyone explain why my current set up would be causing positive pressure?

 

I can't explain it, but my guess would be because your current set-up is causing a piston like reaction, forcing air into your AAV and causing it to close when the sink/dish washer are draining. Nothing wrong with the AAV's, they are working properly. Just a thought. As Mke, Javiles and "E" have said, your current set-up is wrong.

You can google "positive air pressure in sewer pipes" or go to the library and get a more in-depth answer to your question.

Stay tuned, there is a civil engineer and experienced plumbers who would be able to explain it better. Thanks.

 

My guess would be that the water going down the drain and through the trap until it got to the T would be causing positive pressure. I wouldn't cause neg pressure until it passed the T. Assuming you are meaning pos pressure to vent.

 

Yes, I took the AAV off and when the sink would drain I put a plastic bag over the hole. The bag started to fill with air like a hot air balloon. The picture I drew on looks like a way that it could be set up correct?

Thank you very much for your help and quick reply's!

 

May be something like this would work for you. You might still need a way to connect the copper pipe. But again I would wait for a plumber. It would solve the pos pressure issue I think. The way people are today always wanting to sue you might not get an answer from a plumber because it is probably not code.

 

May be something like this would work for you. You might still need a way to connect the copper pipe. But again I would wait for a plumber. It would solve the pos pressure issue I think.
View attachment 83933

Wow! Thank you for the drawling! That seems like a lot easier of a way without using more parts.

I'll keep that in mind and see what a plumber says when they come by.

 

May be something like this would work for you. You might still need a way to connect the copper pipe. But again I would wait for a plumber. It would solve the pos pressure issue I think.

The AAV is on the wrong side of the trap.