Help with dry vent

[cerealhunter]

Hello,

I'm finishing my basement and I just had the underground plumbing inspection and the inspector found 1 violation on a vent. He cited IPC 905.5 but would not give me to much info on how to remediate it. Everything else he checked out was fine.

Apparently, the issue is that the vent cannot be horizontal

I had 3 different plumbers come out and they cannot figure out what is wrong. the pictures attached show the setup, this is in a basement and the whole thing goes to a sump where the ejector pump lives.

There is also a wet vent (not in pictures) for the sink.

I'm not sure how to move forward, the inspector keeps saying that this is a simple fix but I cannot picture it.

Any help will be appreciated

 

[wwhitney]

IPC 905.5 is about the height at which you can tie vents together. Perhaps the inspector meant 905.4, which is about the vertical rise of dry vents:

https://up.codes/viewer/georgia/ipc-2018/chapter/9/vents#905.4

In that last photo, is the smaller line coming off the wye a dry vent or a wet vent? If it's a wet vent (the lavatory drain), the arrangement looks IPC compliant to me and I see no problem.

If it is a dry vent, then I agree it violates 905.4 (and 905.3). Other plumbing codes (UPC) have an exception there for when the vertical rise is "prohibited by structural conditions," but the IPC does not. So it seems like the way to fix it would be either (a) make it into a wet vent, so it can be a horizontal connection like you have or (b) move the wye closer to the wood framed wall, so that you can roll the wye side branch up at least 45 degrees and enter the wall without ever going flat.

Cheers, Wayne

 

[Sponsor]

 

[Breplum]

Side note: The lav drain (the last two inch branch) should have a long sweep 90, not a regular 90 as it appears to me in the photo.
The rest is Horizontal Wet Vent, which your IPC allows, so it is perplexing to me.
What is with the 3" cleanout under the slab?
We normally would also have run a 3" cleanout above the slab into the wall to be able to fully snake horizontal runs greater than 5'.

 

[cerealhunter]

IPC 905.5 is about the height at which you can tie vents together. Perhaps the inspector meant 905.4, which is about the vertical rise of dry vents:

https://up.codes/viewer/georgia/ipc-2018/chapter/9/vents#905.4

In that last photo, is the smaller line coming off the wye a dry vent or a wet vent? If it's a wet vent (the lavatory drain), the arrangement looks IPC compliant to me and I see no problem.

If it is a dry vent, then I agree it violates 905.4 (and 905.3). Other plumbing codes (UPC) have an exception there for when the vertical rise is "prohibited by structural conditions," but the IPC does not. So it seems like the way to fix it would be either (a) make it into a wet vent, so it can be a horizontal connection like you have or (b) move the wye closer to the wood framed wall, so that you can roll the wye side branch up at least 45 degrees and enter the wall without ever going flat.

Cheers, Wayne

Thank you! I'm going to use the pipe that I capped off (Looks like a cleanout) which will take me closer to the wall and then I can come up where the cat is standing at higher than 45 Deg. and then up the wall.

Thank you again for your help.

 

[wwhitney]

For standard wet venting, your dry vent has to attach to a fixture drain, meaning it has to attach to a drain section that is only seeing the flow of one fixture. It can't be downstream of a wye where two fixtures come together.

Cheers, Wayne