I am going to relocate my washer /dryer to the basement below where it currently is located. The current drain is a 2" pvc which I plan on teeing off for the basement drain, keeping the existing location intact in case it needs to be returned to use. My question is, do I need to put an "s" trap in the drain down stairs? I'm sure for gas purposes it should but I wasn't certain of the requirements. If I should, what would be the recommended connections? I guess I mean should I use a T or would a wye be a better way to go? There is also the possibility that I might install a work sink to the left of the washer as well. The vertical drain pipe is going to go down the right side of the washer.

Thanks for any insight.

Don

Hey Don,

The one word I searched for in your question was "vent". True, a "S" trap will do away with a vent but they're illegal in every state and Canada and I'm not too sure how a "S" trap would handle the forced discharge from the washer pump. A better way would be to come off the vertical drain pipe with a sanitary tee into a upright tee with a AAV,(Air Admittance Valve) and from there into a "P" trap and a 36" washer stand pipe. We'll discuss adding a laundry tray if you decide to install one. Good luck, Tom

Here is a standard washing machine/laundry sink rough-in.

Great picture Growler But what's the second tee picking up? May I use it in my image data base? Tom

The tee at the bottom is picking up the laundry sink and the tee above it is a 2" clean out tee.

Here is a photo of the front view.

And feel free to use any photo I upload.

The tee at the bottom is picking up the laundry sink and the tee above it is a 2" clean out tee.

Here is a photo of the front view.

And feel free to use any photo I upload.


Thanks for the answer and especially the picture. They are better than a thousand words. As for venting, the present drain and current kitchen sink drain both feed into a 3" vent pipe. It is located about 10' from the washer location. I will be putting the new connection closer than the current one so I thought it should be okay. This was a new construction 2 years ago and they told me they could use large drain pipes that allow air around the waste instead of a vent pipe close by. We haven't had any venting issues that I have noticed anyway.

Thanks again for the help.

Don

"they told me they could use large drain pipes that allow air around the waste instead of a vent pipe close by"
This is called "wet venting" however wet venting will never take the place of a dry vent. Regards, Tom