Advice on proposed layout for updating bathroom plumbing

[Wyeorwyenot]

This picture shows the current bathroom plumbing. The pipe on the left is the sink drain and has a vent pipe on the other side of the bathroom. The abs portion of the plumbing on the right is for the tub. Due to a few factors I need to move the partition wall the tub vent traveled in and move the toilet over a couple inches (yes, I know the joist is in the way).

My proposed layout is below. Any advice, critiques, or confirmation on design would be greatly appreciated. Is it possible to consider the main stack vent appropriate for the tub? The drawing is supposed to be the same point of view as the picture. Sorry for poor drawing!

 

[Jeff H Young]

well its not very clear , but it might work that way hard to interpet . but what fitting are you expecting to get a 2 inch move with toilet? even a spigot 22.5 degree befor the closet bend will give you more than 2 inches

 

[Sponsor]

 

[Wyeorwyenot]

Well it needs to move about 4 inches, so I was planning a 22.5 degree right near the toilet flange at the end. I haven't done the math yet, but eyeballing indicates it should work. One of my biggest concerns was if I would be able to entirely remove the existing vent from the tub. In my eyes it looks that it is vented through the main stack, but I'm no pro.

 

[Reach4]

I think the pipe below the bathroom sink (lavatory) sanitary tee is supposed to be 2 inch to do the wet venting.

https://www.iccsafe.org/wp-content/uploads/20-18927_GR_2021_Plumbing_Venting_Brochure.pdf shows IPC venting. See the diagram on the bottom of page 12. Your setup looks like a subset of that.

 

[Jeff H Young]

I forgot to mention the sizing depending on code , But Id be running 2 inch to sink and out roof or reventing at the 3 inch stack

 

[wwhitney]

I think the pipe below the bathroom sink (lavatory) sanitary tee is supposed to be 2 inch to do the wet venting.

If it's a single lavatory, 1-1/2" is allowed by the IPC to be a horizontal wet vent carrying just 1 DFU.

Cheers, Wayne

 

[Jeff H Young]

If it's a single lavatory, 1-1/2" is allowed by the IPC to be a horizontal wet vent carrying just 1 DFU.

Cheers, Wayne

Thought so! Id run 2 if its convieniant though at least up to the lav with a 2x2x1 1/2 santee

 

[Reach4]

If it's a single lavatory, 1-1/2" is allowed by the IPC to be a horizontal wet vent carrying just 1 DFU.

Even if it is wet-venting the toilet?

 

[wwhitney]

Even if it is wet-venting the toilet?

Yes, the IPC only requires a 1-1/2" vent for a WC.

Cheers, Wayne