Bathroom remodel DWV plan - DIY Advice

[JayUSA123]

Hi all,

I'm planning for our bathroom remodel and was hoping for some advice on the DWV plumbing. I'm wondering if the lavatory vent can also vent the tub. The distance from the tub drain to the connection with the lavatory drain pipe (points A & B in the diagram) is approximately 5 feet. Will a wet vent work here or is the distance too far?

Also, the distance from the toilet connection to the stack is about 32". Does this still need a vent? If so, I'm planning to attach a 1.5" wye to the closet bend and take this pipe into the wall and up halfway before tying into the stack. If the toilet does need venting, would this suffice?

Thanks in advance for the expertise!
Jay

 

[Terry]

The lav wet vents the tub if you are running 2" to the lav trap arm, and the 2" trap arm on the tub is 60" or less.
The top of the santee for the lav can be 1.5" on the vent portion.

 

[Sponsor]

 

[JayUSA123]

Thanks for the reply, Terry. So if I understand correctly, the current plan won't work since the distance from the tub to point B is already 5' itself. In order to work the total distance from A to B to lav vent would have to be 5'. Is that right?

Also, does it look like the toilet needs a vent given its proximity to the main soil stack (approx. 32" away.)

Thanks!

 

[JayUSA123]

Based on your previous reply, I put together another plan using a center drain tub. In this plan the distance from points A and B would be 5 feet.

 

[Terry]

The tub trap arm at:
1.5" = 42"
2.0" = 60"
We're counting the horizonal portion of the trap arm, not the vertical to the vent above the lav.
The toilet should be vented before entering a waste stack.
If that's a vent stack, then it can't enter. Water always comes in below.

 

[JayUSA123]

It's a waste stack. There is an existing bathroom here and that's where the toilet drains to. I have to get the walls open more to determine if there is a vent stack in there. (The house is 125 years old, so it's always a gamble.)

 

[Reach4]

It appears that IPC (used by Rhode Island I think) is more permissive than UPC, allowing a 2 inch trap arm 8 ft. You can search this forum for "Table 906.1 " This snip is from https://law.resource.org/pub/us/code/ibr/icc.ipc.2009.pdf page 72 column 2.

 

[JayUSA123]

It appears that IPC (used by Rhode Island I think) is more permissive than UPC, allowing a 2 inch trap arm 8 ft. You can search this forum for "Table 906.1 " This snip is from https://law.resource.org/pub/us/code/ibr/icc.ipc.2009.pdf page 72 column 2.View attachment 32439

That's right, RI uses IPC. I also just checked the RI plumbing code to see if 906.1 was specifically substituted and didn't find anything.

Thanks so much for that, Reach4. That definitely makes things easier for me.