Hi,

I want to hook up a utility sink next to my washing machine on the first floor. The washer discharges into a standpipe. The standpipe has a trap, and then connects through a tee to a vertical waste pipe (drain stack?) that goes upstairs through the roof as a vent. Below this tee, there is a 45 deg. Wye with a cleanout plug. Below this, the drain stack goes through the floor and ties in with the big waste pipes in the basement.

My plan is to remove the cleanout cap, add a tee, and then put the cleanout cap back on. Into the tee I am planning to run the drain from the sink, after a trap.

Does this seem like a good plan :) or am I overlooking something:( ?

Thanks in advance for your help!

SD

That cleanout has to be pretty close to the floor instead of all that messing with the wye and cleanout why not simply cut in a sanitary tee into the washers vent 16 or 18 inches off the floor, (Depending on how deep the sink is) and arm out to the utility sink? The washer will be wet vented by the utility sink and everyone will be happy except perhaps the inspector if wet vents are outlawed in your area. Wet vents pass code in mine. Regards, tom

The sink is pretty deep - the bottom is about 18" from the floor. The wye and cleanout is about 10" from the floor so I figured after I put in the sink drain and trap etc. it would be a convenient place to pick up the waste line. The result would look something like this:

| Vent
|
|
| <--- Washer discharge
| /
|<--Sink Discharge
|
| Drain
|
v

There will be about 5" vertical difference between where the washer and sink enter the stack.

Making the hookup should be straightforward. I'm not sure about the venting though. Is this a typical "wet vent" setup?

Thanks,

Stef

Hey Stef,

My concerns deal with the volume and force produced by the washers pump.
If the ell at the base of the stack vent's just under the slab then you stand a very good chance of filling the sink every time the washer discharges or at least backing up into it. The way I describe would put you higher then the washer discharge and on another line. Your plan would discharge directly above it in the same line. While your plan may work it's not the way I would configure the jiob. I tend to err on the side of caution. And yes, it's a "wet vent" situation. Regards, Tom

Tom,

Thanks for the great advice. With the counter top installed etc. the sink may be just high enough to tie in above the washer like you recommend. It certainly makes sense to go that way. This will be next weekend's project. I'm still putting in the wall cabinets.

Thanks again for your help!

Stef