Correctly Vent a Washer?

[TDG]

I cut into a wall of a friends house to replace their washer faucets with a washer outlet box. They have their washer drain pipe currently hooked into the vent pipe using a wye fitting (I believe is the name) coming out of the wall (z-axis).

I looked down into the wall and see that the vent is directly into an S pipe which is exiting into the city sewage.

So:
Vent to roof (left side) > WYE > S trap > City




Here is the current set up:

From my research I believe this is wrong. The correct to code solution is a single vertical vent. The drain for the washer should feed downward into a P-trap, travel 4" min. and then feed into the vertical vent (which is directly down into the city) via a sanitary T.

Correct way: (?)



So, this would be the easiest solution:
Just to replace the WYE fitting and turn it into the wall and have the washer box feed into it.




But I'm wondering if I'm able to vent at a 45 degree angle like the following solution or if that isn't to code.



Overall - I need help and I appreciate you folks!

 

[breplum]

In your last image, yes, it is fine to do it that way. Offsets are allowed. Once 6" above the flood rim of the drain box you can even use simple 90 degree elbows. Add a cleanout down low if you have a chance.
There are better WM boxes that have built in Water Hammer Arrestors or can be added on the shutoffs after also.

 

[MicEd69]

Like what breplum said. Also, the P-trap weir need to be between 6" and 18" above the floor, and the height of the standpipe needs to be between 18" and 42" above the P-trap weir, if you are under IPC. UPC and some other codes have a maximum height of 30" for some reason. And this should all be 2" pipe.

 

[TDG]

I just learned that Kentucky uses the "kentucky State Plumbing code" which uses elements from both IPC and UPC.

Awesome, thank you all! I went with the Oatey with the pex barbs instead of the quick attach and the Hammer Arrestors (I didn't exactly understand what they did initially).

 

[TDG]

Offsets are allowed. Once 6" above the flood rim of the drain box you can even use simple 90 degree elbows. Add a cleanout down low if you have a chance.

Okay, so I can use two 90 degree connectors instead of the 45s? So long as both are 6 inches above the flood rim? The one part I'm not following is the cleanout down low...?

Further, everything is jammed into one stud bay here. I'm not sure I have a neighboring bay to work with, because of electric and the bathroom sink on the wall behind it.

Also, will I ever have to worry about 90s clogging.. it is just a vent, but over years and debris..?

Solution:

 

[TDG]

Also, the P-trap weir need to be between 6" and 18" above the floor, and the height of the standpipe needs to be between 18" and 42" above the P-trap weir, if you are under IPC. UPC and some other codes have a maximum height of 30" for some reason. And this should all be 2" pipe.

View attachment 47893

Awesome! On my way to being a pro because of you guys, haha.

 

[Twowaxhack]

I think standpipes should be allowed to be 1.5”. 2” traps.

 

[MicEd69]

Okay, so I can use two 90 degree connectors instead of the 45s? So long as both are 6 inches above the flood rim? The one part I'm not following is the cleanout down low...?

Further, everything is jammed into one stud bay here. I'm not sure I have a neighboring bay to work with, because of electric and the bathroom sink on the wall behind it.

Also, will I ever have to worry about 90s clogging.. it is just a vent, but over years and debris..?

Solution:
View attachment 47901

Your vent line should not be a problem as there is no waste flow through it. But while you can use 90-degree elbows in the vent line, if you ever need to snake the drain line below the vent connection from the roof as you don't have a cleanout, 45-degree elbows will provide better access for a snake.

I don't know the specifics of your Kentucky plumbing code, so you will need to verify the details of your installation.

 

[TDG]

Your vent line should not be a problem as there is no waste flow through it. But while you can use 90-degree elbows in the vent line, if you ever need to snake the drain line below the vent connection from the roof as you don't have a cleanout, 45-degree elbows will provide better access for a snake.

I don't know the specifics of your Kentucky plumbing code, so you will need to verify the details of your installation.

That's what I want imagining. Thanks for your help!