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Reach4, your last drawing I don't think is allowable because what you are showing is a wet vent. You cannot wet vent a standpipe for a washer with a lavatory as the washer is not considered part of a bathroom group which allows a shared/wet vent. What I am planning on doing is the pic below: -...

Smooky, what is the problem with changing direction once you have reached the drain only section of the pipe? The reason I am doing this is because there is an LVL directly under the wall that cannot be compromised. The floor on the other side of the wall is raised so I am able to 90 it under...

Reach4, I was just looking over your drawing again that show a wye and 1/8 bend being restricted due to blockage of airflow. Wouldn't that only apply if the vertical drain was acting as a wet vent for the lower branch coming in due to the lower branch not having it's own vent? In my situation...

Ok, so I should use a sani-tee plumbed in below the existing sani-tee on the standpipe drain. Thank you Reach4.

Smooky, thanks for the pics. standardairconditioner I appreciate your help as well. Looks like I need to do the separate vent. WV is under the IPC and IRC as far as I can tell, and I remember now seeing that definition of a bathroom group in my research. This is not a typical bathroom, lol...

Smooky, isn't a tee-wye the same as a y with an 45" street elbow on it? What's the problem with the tee-wye? Please don't take my questions as argumentative, I am just wanting to learn :)

Yes that was one of my proposals. The other would be the exact same thing but adding a vent to the lav. using a sanitee if I could not share the standpipe vent like you have it drawn. By the way, what program are you using to draw those nice illustrations?

standardairconditioner, I think I know why you are confused now. I have already moved the standpipe. What you are seeing in the pic is the new location. The proposed connections are tying in a lavatory to the right of the standpipe drain in the next wall cavitiy over. The left piece of blue tape...

Thanks Smooky, thats what I was hoping I could do. I will put in a combo tee-wye below the laundry sanitee and come over to the sink area keeping a 1/4" slope and put in another 1.5" sanitee and vent out the top of it. And no I was not planning to put the trap for the sink in the wall.

New further out pic, no markings. I'm not sure how just putting tape where I want the connections helps versus drawing it but that is what you asked for. Smooky, how is the proposed connection a wet vent? Does the vent not start at the top of the sanitee and from the bottom of the sanitee down...

I am moving my washer and re-plumbing the standpipe and adding a sink. My current plan is to have the sink drain straight down like the standpipe is currently and tie into the 3" line running in that joist cavity in the basement. But then I got thinking it would be simpler to tie into the drain...

So I did a mock up of what I am thinking of doing. It is not perfectly to scale but shows the connections. From left to right (first and second pic) Top to bottom (3rd pic): 1. Connection for floor mounted rear discharge toilet. 2. Connection for washer 3. Connection for lavatory Some...

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I continued searching old threads on the site and seen where it was mentioned that closet bend would be acceptable, where as I thought I would have to use a long sweep. Is this correct?

I am adding a toilet and sink to an existing laundry room so I have another "1/2 bath" in the house. Having an issue with plumbing the toilet. Due to the placement of an LVL in close proximity to the 2x6 plumb wall it will be very difficult if not almost impossible to use a standard floor...

Bump...planning on starting this first thing tomorrow morning. Any help is appreciated

Thanks for the replies. So if I cannot count the Standpipe as a vent for the WC, I see 2 options: 1. Add a 2" vent between the WC and the Standpipe of the 3" line. (using a 3"x2" wye rolled so the vent starts above the center line of the drain) 2. If possible, have the drain for the Standpipe...

Hello, If I could get some confirmation that this plan is going to work it would be greatly appreciated. I am adding a half bath to an existing laundry room. Currently there is no vent at all in this room, thanks to an idiot builder. Also, the p-trap is below the floor in the basement (heated)...