Adding sink next to wrong side of washer

[Ajt2014]

Hi guys,

I have been reading countless forums searching for an answer to my problem I'm facing. I have learned quite a bit the last few days about plumbing, being an amateur.

The dilemma I am facing is that the sink I am adding is on the other side of where the vent stack is. I have attached a drawing of what is currently there and where I'm wanting to put the sink.

The issue I'm facing is that all the tutorials and questions is see similar to this are all when the sink is on the other side of the vent, making it simple to tie into the drain/vent stack (the one common photo I see on a lot of posts).

One "solution" (possible maybe?) Would be to use an AAV (legal in Oregon where I live). I have attached another photo of what I believe would work, maybe?


Another "correct" solution would be to do something like this I believe?


The distance from the sink to the main stack is gonna be about 4.5 feet.

If you need any more info, I'll be active on this forum post...

 

[Terry]

In a perfect world, the washer gets a vent and the sink gets a vent.

 

[Sponsor]

 

[Reach4]

In both of your sketches, the sink does not have a P trap. You could give each trap arm its own AAV. There would an alternative to use one AAV with other piping.

Another possibility is to discharge the washer into the sink and have no standpipe.

 

[Ajt2014]

Okay, so would this work then since the sink would have a p trap and the AAV would be after the sinks p trap?

The blue and red are already there. Green is what I'm adding.

The washer into the sink is not an option since this sink will be a small "bar" sink, 6 inch deep sink.

Is there any way I could pipe the sink into the washer standpipe? This would be the easiest to do but I don't think it is really allowed.

IF this is possible, would I still need a p trap for the sink since there is a p trap for the washer drain?

Thank you guys.

 

[Reach4]

Is there any way I could pipe the sink into the washer standpipe? This would be the easiest to do but I don't think it is really allowed.

I am not a plumber, but I don't think it is allowed. It would probably work fine.

IF this is possible, would I still need a p trap for the sink since there is a p trap for the washer drain?

No P-trap for the sink in that case.

To make your drawing better, you want to join the sink drain below the sanitary tee that the washer uses. If you post a photo of the existing stuff might help. More knowledgeable people may have a better suggestion.

 

[Terry]

If the standpipe has a trap, I have seen the sink tied into that without the additional AAV.
Is it code? I'm not sure. Anybody here try that before?

 

[Ajt2014]

Okay guys, bear with me... My Photoshop (paint) skills are subpar. I have one photo of the wall currently... I followed the baseboard to where the washer standpipe to the left (out of the photo)... I don't have another photo now. Sorry for the mess...

 

[Reach4]

What we are thinking about is like that but with no AAV.

 

[Ajt2014]

What we are thinking about is like that but with no AAV.

That makes it easier...

You mentioned connecting the sink to the standpipe below the sanitary T that the washer uses? The sanitary tee is the part where the blue connects to the red, correct? Or is the last drawing I have posted good (and removing the AAV)?

 

[Reach4]

You mentioned connecting the sink to the standpipe below the sanitary T that the washer uses? The sanitary tee is the part where the blue connects to the red, correct?

Yes.

Or is the last drawing I have posted good (and removing the AAV)?

Whether it is technically OK, is maybe debatable. I think it would work fine anyway.

The connection to the standpipe would be a wye. The sink pipe would be at 45 degrees near the standpipe.

 

[Ajt2014]

Okay. Thank you!

 

[408guy]

This is how I would roll if possible. 2” waste below the trap, and 1.5” vent, or second drawing attempting to illustrate @Reach4’s point:

 

[Terry]

You have the wall open there. It would be so easy at this point to cut out the washer and run both the washer and sink the right way.