Will this DWV situation work?

[Steven JP]

Will draining and wet venting this shower right above a toilet present any problems. The shower will be 2 inch and tie into the vent stack using a sanitary tee. Then directly below it I will go to three inch and the toilet will tie into the stack.

 

[Reach4]

I am not a plumber. I think it would probably be OK, but it would be better if the toilet fed in with a wye instead of a sanitary tee.

 

[Sponsor]

 

[Steven JP]

I've read that sanitary tee is better because it lets the pipe wet vent. I figure this will be ok too. I just wonder if when the shower is running will it not let the toilet vent if it is flushed

 

[Reach4]

I've read that sanitary tee is better because it lets the pipe wet vent.

Then I hope this encourages you to you read more.

 

[Steven JP]

Then I hope this encourages you to you read more.

Huh?

 

[Reach4]

I was hoping you were now encouraged to read more on the topic. A quick look did not turn up the clear discussion I was hoping for, however. The advantage of a wye is that it helps the solids to better get going in the correct direction. Venting for a toilet serves a very different purpose than for other things. For other things, the vent must prevent the trap from siphoning out. A toilet trap is intended to siphon out, and the trap gets refilled by the refill tube from the fill valve.

There will probably be more comments on this thread as to which, wye or santee, is better, so that might be the best reading.

Maybe a poll would be appropriate, such as.... Between santee vs wye in this case:

1. only a santee would be acceptable
2. both are acceptable but santee is better
3. both are equally acceptable
4. both are acceptable but wye is better
   
5. only a wye would be acceptable.

Here are 2 ways a wye could be used, but not the only ways:

 

[Steven JP]

I was hoping you were now encouraged to read more on the topic. A quick look did not turn up the clear discussion I was hoping for, however. The advantage of a wye is that it helps the solids to better get going in the correct direction. Venting for a toilet serves a very different purpose than for other things. For other things, the vent must prevent the trap from siphoning out. A toilet trap is intended to siphon out, and the trap gets refilled by the refill tube from the fill valve.

There will probably be more comments on this thread as to which, wye or santee, is better, so that might be the best reading.

Maybe a poll would be appropriate, such as.... Between santee vs wye in this case:

1. only a santee would be acceptable
2. both are acceptable but santee is better
3. both are equally acceptable
4. both are acceptable but wye is better
   
5. only a wye would be acceptable.View attachment 53175

Oh ok yeah I'll have to do more research. Thanks

 

[hj]

ON a purely theoretical level, the sanitary tee is "required" since it does NOT create an elongated "S" trap and makes inspectors happy. As a practical matter, however, since the trap is already an "S" trap a combo/Y/T, is immaterial as all work equally well. In your poll, 1, 2, or 3, o.k., but NOT 4 or 5.

 

[Steven JP]

ON a purely theoretical level, the sanitary tee is "required" since it does NOT create an elongated "S" trap and makes inspectors happy. As a practical matter, however, since the trap is already an "S" trap a combo/Y/T, is immaterial as all work equally well. In your poll, 1, 2, or 3, o.k., but NOT 4 or 5.

In your opinion would that setup I drew up work fine? Im going to come below a joist, tie into the water pipe with the toilet, and then come through the same joist and tie in the shower right above it
I wish there was a better way without lowering the ceiling.