Back to back bathroom drains and vent setup

Users who are viewing this thread

jeffesonm

Member
Messages
43
Reaction score
5
Points
8
Location
NC
Renovating back to back bathrooms. Was hoping to keep the 1950s cast iron as the outside looked good but got a clean out off and inside looks not great.

Does this look okay? Line to kitchen has its own 2” vent.
 

Attachments

  • FDF0180A-C20A-4F0A-B755-4712571456B2.jpeg
    FDF0180A-C20A-4F0A-B755-4712571456B2.jpeg
    105.1 KB · Views: 31

Breplum

Licensed plumbing contractor
Messages
1,850
Reaction score
742
Points
113
Location
San Francisco Bay Area
Would not meet UPC code because the WCs and shower would each need their own vent.
Any run in excess of 5' needs a cleanout if on the first floor.
 

wwhitney

In the Trades
Messages
6,493
Reaction score
1,807
Points
113
Location
Berkeley, CA
The layout works for the IPC. The right hand lav can wet vent the tub and two WCs; the left hand lav just wet vents the shower. So it is important that the kitchen tie in downstream of any wet venting.

For the tub and shower drains, they are limited to one pipe diameter of fall before joining their respective lav drains to be wet vented. This is to prevent siphoning of the traps.

Cheers, Wayne
 

jeffesonm

Member
Messages
43
Reaction score
5
Points
8
Location
NC
Thanks Wayne.

Here is what I hope to be the final layout.

One of the two lavs on the left is actually a bar sink upstairs on the wall adjoining one of the bathrooms. From what I read it the wet venting has to include only bathroom group fixtures so moved shower drain over to main line instead of wc arm.
 

Attachments

  • D778F425-32B7-4B4C-A7FF-2017ED68ED5E.jpeg
    D778F425-32B7-4B4C-A7FF-2017ED68ED5E.jpeg
    97.5 KB · Views: 13

wwhitney

In the Trades
Messages
6,493
Reaction score
1,807
Points
113
Location
Berkeley, CA
Here is what I hope to be the final layout.
That looks fine. Note the tub trap arm extends from the tub trap outlet to that vertical wye where it joins the lav drain as it turns horizontal. It's a little odd that your tub trap arm increases in size, but fine, particularly as long as the drain center line falls no more than one pipe diameter based on the trap size.

One of the two lavs on the left is actually a bar sink upstairs on the wall adjoining one of the bathrooms. From what I read it the wet venting has to include only bathroom group fixtures so moved shower drain over to main line instead of wc arm.
That is correct that wet venting has to include only bathroom group fixtures. So your options are to move the shower as you did, or to put the bar sink on a separate vertical drain (with separate vertical vent, although the vents can combine within the wall at any elevation at least 6" above both sink flood rims). Then the bar sink drain could join the kitchen sink drain, but that bar/kitchen drain would need to be kept separate from the lav drain until after the shower drain joins the lav.

Either way is fine, just wanted to throw out another option.

Cheers, Wayne
 
Top
Hey, wait a minute.

This is awkward, but...

It looks like you're using an ad blocker. We get it, but (1) terrylove.com can't live without ads, and (2) ad blockers can cause issues with videos and comments. If you'd like to support the site, please allow ads.

If any particular ad is your REASON for blocking ads, please let us know. We might be able to do something about it. Thanks.
I've Disabled AdBlock    No Thanks