I am remodeling my house and was wondering if I can put on a same 3 inch drain line a toilet upstairs and a washer downstairs ? The drain will be of course directly vented

Thanks

Nigel

Hi Nigel

As long as the toilet and the washing machine are both individually vented then yes, you can do what you propose!

Mark

Hi Mark

Thanks for your fast response

So I guess the toilet will be dry vented and the washer drain will be wet vented

I have a small drawing attached below can you confirm me if this design is correct ?


Thanks
Nigel

Nope, that's not going to cut it. You will need a dedicated/individual vent for the washer trap that will go up and tie into the toilet vent at least six inches above the rim of the toilet. Otherwise, every time you flush your toilet it will siphon the washer trap allowing sewer gas into your home. Health issue at the least. Im betting Mark can draw up a correct way to do this. I also note that the washer trap in your diagram is a running trap. Also a no go. The washer standpipe needs to drop directly into the p-trap.

Since Lee suggested it (thanks lee... :p) I drew this up real quick... see image!

NOTE: You cannot wet vent a washing machine!

The diagram shows an alternative piping arrangement with a 2" vent for the toilet. Here, as long as you have at least 1 - 3" vent going through the roof of your house you don't need to run another 3" vent through the roof..can run 2"... see image.

I forgot to mention that the washer standpipe (pipe coming out of the washer drain P-trap) needs to be about 30" tall. The AAV is a mechanical vent when, if allowed, can save you the time of running the washer vent up and over and connecting into another vent. It is NOT allowed in mosts states, but in case it is allowed in your state I wanted to mention it!

Mark, I was just certain you had all this free time on your hands, so I figured you would love for me to give you a little extra to do for free here. Ha. Honestly, if you don't get "tips" here, you damn well should.

That s way clearer now
Thanks everybody for fast, clear and very efficient answers

NIgel

Good luck on your project. Please keep us posted on your progress.

I'm with MGD I think all the plumber here should be tipped. You guys are great.

Should be no problems, as long as drain runs down hill all the way

Once again, jazzas has chosen to pop in and offer up a ridiculous answer even AFTER the question was answered properly and showed that it is in fact A PROBLEM if not designed and executed according to plumbing engineering principles!

Lee and Parttime, thanks for nice words! I think we all deserve a few more pats on the backs then we get around here... that's for sure!

Mark