Wet venting Bathroom group

[eBrite]

Hello everyone, I am trying to understand wet venting for a single bathroom group and put it into practice on my house build. Can you let me know if this arrangement will work? the double Lav is my vent. I am not sure about the shower at the start of the set up. I have a main 3" branch that is running through the house and this is the start of that trunk. It is a straight run and everything will feed into it including two other bathrooms and kitchen.

Thank you for the help.

 

[Rossando]

Where are you located what state or county? My local plumbing codes wouldn't allow this so I can't help but provide us this and we have people who can help. All I can say is I wouldn't plumb any fixture without a vent in my home or anyone else's. Drains gasping for air is a big no no.

 

[eBrite]

I am located in New Mexico - Bernalillo County.

I think I need to tie in the lav before the toilet. This is a bathroom group and there are provisions for a single vent in UPC 908.2 for wet venting a bathroom group.

 

[MicEd69]

Yes, a lot of people do not understand venting. Your sketch needs to have some dimensions to be able to answer everything. But the way you have it now, the shower is not vented at all. And depending on the lengths of your runs, the toilet may not be vented under UPC. Also, the way the combos enter the branch matter.

 

[eBrite]

Yes, a lot of people do not understand venting. Your sketch needs to have some dimensions to be able to answer everything. But the way you have it now, the shower is not vented at all. And depending on the lengths of your runs, the toilet may not be vented under UPC. Also, the way the combos enter the branch matter.

The combos come in with basic 1/4” pitch from horizontal. If I switch the toilet and lav drain I believe it works as it should. The trap distance from shower to lav tie in would be less than 2’. The toilet to main is ~4’ and lav drain after dropping into floor is about 8’ run but all the tie ins to main are within 2’ of each other.

 

[MicEd69]

Well, that looks like it would work now. But it seems to be some funky sink drain routing just to eliminate a shower dry vent that would also vent the toilet.
I don't know what restrictions you have, and there are 100s of ways to plumb things, but I like things as straight and as well vented as possible. If I was doing this, I would consider something like below, so that the toilet doesn't have any 90s. And while I don't think wet vents are required to enter drain lines from above the centerline of the drain line like dry vents do, I think that is still best practice.