DWV and rough in for a 2 story addition...could use a critique

rxharr6 · Apr 23, 2012

Hi Folks,
I just got a shell of an addition built and now a need to begin the work I can't afford to pay anyone else to do. I have completed a few rough ins and a couple complete plumbs in the past but those were mostly straight forward and the stack was there to tap into. So before I jump into this two story 2 bathroom I thought it would be good to get some input from this forum and make any adjustments that might be needed before I get out the tools.
Here is an image of the plan at this point. I have colored everything that is dry-vent green in case that isn't obvious. The stack is 3" and vents through the roof, the rest is 2"
So, anything jump out as ill conceived?
Thanks in advance!

Terry · Apr 23, 2012

If this was UPC plumbing, the downstairs toilet would need to be vented before it connected to the main waste line.

Sponsor · 2022-01-29T12:20:58-0800

Tom Sawyer · Apr 23, 2012

And... all of those fittings on the first floor need to be 10 pipe diameters from the vertical stack that comes down from the 2nd floor

rxharr6 · Apr 24, 2012

OK, thanks, had an alternate version with a toilet vent but wasn't sure about need...but now with Tom's comment below I have some re-work to do...but with a vent on the downstairs toilet of course!

rxharr6 · Apr 24, 2012

Thanks Tom, just studies up on the code and in my Virginia version of the UPC the section I assume you are referring to is "704.3 connections to offsets and bases of stacks"...hadn't read that the way you explain so thanks for the redirect. Of course that means back to the drawing board ...

Nukeman · Apr 24, 2012

The toilet doesn't need a vent here in VA (distance is unlimited). We are under IPC. It won't hurt, but you just don't need it. VA codes are here (scroll down):

https://www2.iccsafe.org/states/Virginia/

hj · Apr 24, 2012

I am not sure if the IPC would allow a "downstairs" toilet to be unvented. That usually only applies to a toilet on the same, or upper, level.

Tom Sawyer · Apr 24, 2012

IPC allows it as long as there is a vent "somewhere" on the system.

hj · Apr 24, 2012

That would be typical of the IPC, but a toilet does NOT need a vent to "prevent siphonage" because that is what makes it work, but the lack of a vent at the downstairs one does NOTHING to minimize the effects of positive pressure caused by operation of the upper floor plumbing.

Terry · Apr 24, 2012

I've seen situations where the upstairs toilet will affect the water level of the toilet below it.
If it were my home, it would be vented. The push of air down the line does have an affect, especially with the newer toilets and bowls. IPC may want to rethink this, or are they stuck in the past with the five gallon bowl thinking?

rxharr6 · Apr 24, 2012

Thanks for all the insight folks. I did a bit of re-work and I think I can have my cake and vent it too with this design change:

Thanks for your help!

Dlarrivee · Apr 24, 2012

Nobody noticed the running trap on the shower?

rxharr6 · Apr 25, 2012

OK, good comment on the trap dlarrivee. Easy tweak, thanks!

hj · Apr 25, 2012

Nobody noticed the running trap on the shower?

Just considered it a "glitch" in his software, since many drawings show it that way.

DWV and rough in for a 2 story addition...could use a critique

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