washer & sink hookup...

[phantomvs]

Ok so here is the story, the wife wanted a sink next to the washer.

So i did a rough-in and she ran the washer and once i got a little water backup (about 1 cup) into the sink drain.

Is this done correctly or what would you guys change?

I know it should be a 2'' abs tube but its a 1 1/2'' and everything was fine till i added sink.

I am thinking its because the drain for the sink is below the washer , but the reason i did it that way is cause if not the drain would be too high (18'' +) for the sink.

Any ideas ?

BTW where you see the orange wire it leads to a AAV and main drain is coming from the right side.

Thanks in advance !!

[jadnashua]

If the connection to the sink was a wye rather than a sanitary T, it might work better. Or, maybe a double-wye to keep the overall length down. Wait for a pro to comment, as I probably am missing something...

[phantomvs]

You see my main problem is that i need to keep the height down.

If i put the sink above washer it will be too high. How can i have both on the main branch without raising sink level.

[Terry]

Instead of trying to wet vent a washer over a sink, (which would never be allowed in any plumbing code, even if it had been run in 2")
Cut in a wye for the washer to the right, go up to a "Santee" for the trap arm.
For the sink, continue on from the wye horizontal and use a combo fitting for the vent on the trap arm. Now the two vents, the washer vent and the sink vent can tie together at 42" above the floor.

Running a washer past a sink drain is a problem.

Wet venting can only be done on bathroom groups.

Wet venting requires 2" or larger piping.

A wye fitting on the vertical on a trap arm, is an "S" vent. It will siphon the trap. A Santee should be on the vertical for a traparm.

[phantomvs]

Thanks Terry for the help.

Just 1 question, when you say the washer and sink vent can tie together do you mean i use only 1 vent (AAV) or tie together with no vent or double vent ?

Thanks !

Matt

[Terry]

A vent is always required.
You can tie vents together and use one AAV as long as you have an atmospheric vent somewhere on the system.

[phantomvs]

Thank You Terry !!

[mikeplummer]

x2 Terry..one point though. our plumbing code does allow wet venting of fixtures other than bathroom group.... but one should always acknowledge proper plumbing practices.