Adding sink drain to washer drain without going thru studs

[Strapping Young Comrad]

Hi All,

I have been researching this and have not seen an exact scenario but I am hoping that I have come to the correct answers. If someone can review my potential install that would be greatly appreciated.

I am trying to add a utility sink drain to my existing washer drain plumbing. I have an existing 2 inch drain coming out of the slab and a santee going to a 2inch washer drain and trap to the right, the vent going up is a 1.5 inch with a cleanout installed (plug is facing out of the wall). I am trying to replace the santee with a double fixture tee and add a 2 inch sink drain going to the left.

My issue is that I do not want to cut through the 3 studs and dryer vent that would be in the way as this is under the stairs anyway. Can I have the sink drain come out and go around the studs and then thru the drywall for the sink trap as shown in EX 3 (my current situation) and EX1 (an example I found online)? Will this cause any drainage issues?

Also, the 2inch sink drain arm will be about almost 4 feet in length, will that cause any issues considering the washer drain arm is much much shorter, about 1 foot maybe? As shows in EX 2?

Thanks for any feedback you can provide.

 

[Reach4]

Would this work for you?

Alternatively, you could put in a laundry tub, be rid of the standpipe, and put the washer drainage into the laundry tub.

The limitation is that IPC now wants 3 inch drain for a standpipe and laundry tub combined in the method you proposed.

 

[Sponsor]

 

[Strapping Young Comrad]

Would this work for you?

Alternatively, you could put in a laundry tub, be rid of the standpipe, and put the washer drainage into the laundry tub.

The limitation is that IPC now wants 3 inch drain for a standpipe and laundry tub combined in the method you proposed.

Thanks for the reply. If I want to include a p trap for the sink which will be at the left end of the red line in EX2, will I still need a 3 inch drain? This is also considering I will use a double fixture tee between the sink drain and the washer drain.

 

[wwhitney]

Are you under the IPC or the UPC? If IPC, and you have two traps, one of which is for a laundry standpipe, then the combined drain needs to be a 3" drain.

Cheers, Wayne