Wet Venting for Dummies

[NCBubby]

Holy Cow today has been a total head scratcher! Props to everything that you professional (and amateur) plumbers have to go thru. I have racked my brain all day today trying to figure out this wet vent and I have to admit defeat. Any advice y’all can give to this newbie will be greatly appreciated.

I am trying to wet vent a simple bathroom (shower, toilet, double lav) and can’t for the life of me figure it out. This first pic is how the bathroom will be laid out:

https://imgur.com/SPwbhif

So my understanding is that the toilet needs to be the most downstream fixture in the wet vent. My plan is to tie the shower, lavs, and toilet into the same 2” vent above the lavs.

I don’t want anyone to think I didn’t draw up at least 10 failed schematics... I did. But I won’t post those here because they will probably only serve to confuse you. Here is my latest and greatest but I have the sneaking suspicion it is wrong...

https://imgur.com/qiyeZhL

At this point I just want the darn thing to be right. I am especially getting confused on where and how (what fittings, diameter, etc.) to tie in the toilet.

This should be simple as I am essentially doing the same as this diagram but in the opposite direction (sewer runs to the right). I guess with all the figuring I’ve done on it I’ve lost my confindence in how it should all be tied together.

https://terrylove.com/forums/index.php?attachments/upload_2017-6-22_8-51-14-png.40421/

Thanks for your help happy to answer any questions.

 

[Plumber Man]

The way you have it drawn is correct.
Because it is a shower you'll need to put in a 3 inch wye at the toilet and then a 3 by 2 wye where it splits to go to the shower and lavatories, put a 3 by 2 bushing in the end of the wye and run 2 in to the shower drain.

 

[Sponsor]

 

[mherman]

removed.

 

[hj]

quote; Because it is a shower you'll need to put in a 3 inch wye at the toilet and then a 3 by 2 wye where it splits to go to the shower and lavatories, put a 3 by 2 bushing in the end of the wye and run 2 in to the shower drain.

WHY? the way he has it drawn is how I would have installed it for over 65 years.

 

[NCBubby]

Awesome, thanks for the replies! Sounds like I am on the right path... Here is my latest design I put the fittings on there does this make sense to yall?

https://imgur.com/I57sjK7

2" X 2" double sanitary tee for the lavs and vent comes down to a 2" X 2" wye the left side of which brings in the shower.... Then I need to go from 2" to 3" not sure if I should use a flexible coupling (rubber) or a 2 to 3 inch reducer coupling (PVC), probably doesn't matter. Then off that coupling I go to 3" X 3" wye to bring in the toilet and that goes out to the sewer. Sound good?

 

[Reach4]

2" X 2" double sanitary tee for the lavs

You want a fitting called a double fixture fitting.

 

[NCBubby]

You want a fitting called a double fixture fitting.

Good catch! Yeah I noticed with the sanitary T if you were to snake it it would just go right to the other side... Double fixture fitting makes way more sense.