Help for moving existing lines

My basement was already stubbed for a bath but the locations were not what we wanted. In the picture you can see the builder ran the sink lin between where the shower and toilet sit. The lines indicate where I want to take the lines but am not sure of the best route. The shower seems pretty straighforward, I'm simply moving it a foot or so to center it for a walking shower. The sink drain I was thinking of capping off and running a new line from the location I indicated. Is it ok to cap off the existing wye just off where the shower passes?

Once that is figured out, I have to figure out how to vent these. The builder didn't run the vent down to the basement. The quotes I got all said they would use a studor vent. I have a place to locate it opposite the sink but am not sure how the shower will tie into this. In it's current config, would a studor vent off the sink would work for the entire set of fixtures? If so, would it also work with the lines in the new location?

Last question. Is it normal to go from a 4in pipe to a 3in? The toilet pipe is 4in till it turns.

thanks for a great site.

lf

DWV should never go down in size, always up. Going from larger to smaller leaves fluid in the larger pipe that may cause build up and future problems.

Not sure it's good to use a studor vent with a shower or toilet...

Do it right and vent thru the attic.

4" to 3"

I didn't see any pictures, so I'm wondering how far the toilet's 4" run goes. A 4" to 3" reducing closet bend is very common. It's one piece that joins the toilet at 4", reduces to 3" over the course of the 90 degree bend to join the 3" waste pipe. If the toilet actually empties into a run of 4" pipe that eventually joins a 3" pipe via a reducing coupling, my amateur opinion is you've got a big problem.

Mikey, that's it then. Not sure why the picture didn't attach. I'll see if I can try it with this post. It does immediately go at the 90 to a 3 inch.

Looks like that attached ok. Prashter, I'm trying to get the original plumbing plans for the house to see where I could tie in if possible. The AAV idea came from what other plumbers said when I got quotes. I had only heard of them being used in sinks (we have one on our kitchen sink) but I was told you can buy larger ones for more than one fixture. I'm also going to get some official word from an inspector to see what they like here in Ga.

The lines in the picture are mainly to show location of the fixtures not really where I plant to run the actual lines. I read that it's good to have the toilet down from the sink so I wanted to tie the sink drain into the toilet drain. I've seen to configs for this. One had the sink draining into the back of the toilet, the other had it tied directly after the toilet made the 90 turn horizontal. Is either better?

thanks again,

lf

Just spoke to an inspector and he said a wet vented studor vent is fine.

So now my additional question is:

Are the shower and toilet vented if I vent behind the sink and tie into the toilet. I think I've confused myself or am making it too hard as I've seen numerous wet vent diagrams that don't seem to fit this situation.

thanks,


lf

Toilet likes to be downstream of sink only bkz minimizes chance of siphoning. But if normally vented (all fixtures need to be indiv vented) not a big deal. Not sure if studor vents make it a requirement.

For the sink and toilet, I'd vent in the walls. You can really run the sink drain above ground through the wall instead of having it under concrete.

Prashter, so you'd take it all the way around the corner in the wall? I was just going to cut out that section and cap it off. I had thought about running it in the wall at one point but it seemed like a long way to go. I was just trying to shorten the distance.

thanks,

lf

thought I'd let everyone know how it turned out

Just thought I'd post a shot of the finished drainage. This doesn't show the supplies, or the studor vent line behind the sink but gives you an idea what will hopefully pass inspection. I'll let you know how it goes. Thanks to all for the advice, it went in a little different than I first had imagined.

lf

What code are you working with?

That wouldn't work with the UPC plumbing code.

drains

It looks like a good DIY system, but I would not have installed it like that, and the inspector should have a problem with the shower drain not being vented. The toilet flow past its connection may create a suction and affect the shower's trap. The aav at the lavatory has to be accessible once the walls are installed.

I still don't get how the toilet is vented. Or the shower for that matter. HJ, how's that make it a good DIY job???

Yikes,


So first to answer Terry's question. I have to say first I got advice from at least 3 plumbers (2 of which are friends). I also called an inspector prior to proceding with the install. I also read quite a bit from this forum and books so I felt somewhat prepared. The thing that sealed it was info from the studorvent website that had some diagrams but also referenced 4 codes. Apparently the AAV code they follow in Georgia for installation is under the IPC and IRC. Basically to answer the question, I wasn't following UPC.

So I say yikes because I checked the responses after the inspection was scheduled. So you can imagine I was a bit nervous when the guy showed up. He did confirm that the "proper" way to do this would have been to just do a double wye where the sink....er lav is entering the main drain. He also said it would take quite a bit of water to siphon the shower and since we're on 1.6 gallon flushes, it just won't happen. So the long and short of it is, it passed. I even offered to change it. He said that if he didn't think it would work, he definitely would not pass it.

I think there may also be a bit of confusion based on what I've read as to where I actually placed the AAV, so I'll post the final later today.

So all in all, Whew!

thanks again,

lf

Roger the double-Y, but it looks like everything is wet-vented through the lav, which doesn't look right to me. OTOH, I haven't a clue what a "studor" vent is, so I'm anxiously awaiting the picture of the final.

Hey, thanks for the patience. Here is a picture from a different angle that shows where the AAV (Studor vent) runs behind the sink and the rest of the finished lines. I still have to put blockers up over the studs and a few other things. The room behind the sink will remain unfinished and will give access to the vent. Sorry 'bout the compression.

let me know what you think, and thanks again,

lee

Even though he passed it he told you it wasn't right when he said

"He did confirm that the "proper" way to do this would have been to just do a double wye where the sink....er lav is entering the main drain. He also said it would take quite a bit of water to siphon the shower and since we're on 1.6 gallon flushes, it just won't happen. "

So I hope all goes well in the future for you and whoever buy the house from you when the time comes to sell.