Hey All-- New here as this is something I have not had to do on this scale before. I am renovating our laundry room, which currently only has the hookups for the washing machine box, but I want to add a sink as well. So I need some help with running the drain pipe mostly to make sure it is correct and to code for both the new sink drain and the washer drain pipe. This pic is how the setup currently is. The sink will be going on the right (where the washer box is now, indicated by the Yellow box) and the washer box will be moved over to the left as I indicated with my lackluster drawing skills. The water pipes seem pretty simple as I just need to add some Tees to get them over to the new laundry box but they are in a good spot for where the sink will be going.



But as for the drain, I am really not sure. I was "thinking" of just adding a new sanitary tee on the middle drain pipe (above the current sanitary tee) and having it facing left, and using the same configuration that is currently on the right side, and running that to the new washer box-- But I am not at all sure if you can have 2 sanitary Tees on one pipe like that. Or would it be better to cut that out and just use a double sanitary tee? Also, for the new sink drain, what would be the best way to get that from the current configuration to the current drain pipe? Could I just cut the right pipe (the old washer drain) and add a 2"- 1 1/2" coupler and attached the sink drain to that?



Thanks in advance for any help everyone!!

You should be able to just add a san tee as pictured for the drain.

It depends on your local code. Under the UPC, you would need to have the clothes washer tee below the sink tee. Under the IPC, only bathroom fixtures can utilize a vertical wet vent. You could reuse the existing tee for the sink if you install a sink vent that ties back into the vent stack and then install the upper tee for the clothes washer.

what you don't want to happen is when the washer drains it syphons the water out ouf the sink trap.
now... as steve said, one jusritiction thinks it can happen and another thinks it can not happen.
also the 220V oultet shouldn't be under the washer box.

Author: steve (CA)
It depends on your local code. Under the UPC, you would need to have the clothes washer tee below the sink tee. Under the IPC, only bathroom fixtures can utilize a vertical wet vent. You could reuse the existing tee for the sink if you install a sink vent that ties back into the vent stack and then install the upper tee for the clothes washer.

------------------------------------

Thanks for the info Steve. Here in FL we are under the IPC, so I will tie the sink vent back into the vent stack as you mentioned. Just curious, I cannot seem to find the reasoning as to why it can't just be tied in at the current T without the tie back? I imagine it has something to do with avoiding backups through the vent, but I would just like to know the reason for that. Thanks again!

Author: packy (MA)
what you don't want to happen is when the washer drains it syphons the water out ouf the sink trap.
now... as steve said, one jusritiction thinks it can happen and another thinks it can not happen.
also the 220V oultet shouldn't be under the washer box.

--------------------------------------------------------

Packy, Thanks for the response and good point. We are in FL so we're under the IPC, so what would you recommend? Is it ok if I install the tieback like Steve said, even if the sink T is under the washer T?

And yes, the outlets will be moved as well, thanks for the heads up though!

the picture steve posted is how i would do it.