Hi there,
I'm building a laundry in a closet with a stackable unit.
I have put in place a 2" standpipe for the drain. I goes through the floor and into a crawl space in the basement. The cast iron sewer pipe runs horizontally, and is about 6 feet away.

What's the procedure to tie into it? I understand I will need to use a trap, but from there, it gets foggy.

Here's a diagram of what I have so far:
http://www.havecamerawilltravel.net/plumb-config.jpg


Thanks Much!

This is how you should install your w/m drain. Drawing assumes you have 3" ex. main sewer. If 4" than substitute 3x2 Y with 4x2" Y. Vent can also be in 2" pipe and can be tied together with another vent about 48" and higher above the floor. That San T is actually 2" x 2" x 1 1/2". 1 1/2" is pointing upwards and is used for vent. In case Home Depot doesn't have it than buy 2x2x2 San T and glue in 2 x 1 1/2" bushing... and you are all set to go !

Thanks for the diagram, that's perfect!

Ok, that works, except there isn't a vent and I think it would be very tricky to install a pipe going all the way up through the roof. Is there a way around that?

Thanks much!

Yes, there is. It is called AAV vent. It is a mechanical cap-like attachment that you attach on vent pipe below the ceiling. It would be perfect for your situation. However, AAV vent is not legal in every state - so if your project is under inspection, then you should call your local Building Dept. and inquire about local Code. I will post photo of AAV vent...

This is what AAV vent looks like. You can purchase it in Home Depot or Lowe's for about $5.00...

Super fast answer! Thanks a million.

Ok... now we're on to something.
Could this possibly be a case for a "studer vent"?

5 Bucks!
Perfect.
Best news I've had all day.

Once I get this sorted out, I'll be sure and post the results.

One more thing...
This is a 2 family house and it turns out there is another PVC down there for the washer that is in the other apartment. It taps into the cast iron sewer pipe. Can I simply send my washer drain to that?

What kind of fitting should I use for the connection? And would I still need the vent?

Thanks again!
Sam

We usually like to keep each section of house with its own dedicated plumbing. But - yes, you could lead your new 2" drain under the floor and connect it to the existing PVC pipe that serves other washing machine. This way you would avoid cutting into existing sewer.

Yes, there is. It is called AAV vent. It is a mechanical cap-like attachment that you attach on vent pipe below the ceiling. It would be perfect for your situation. However, AAV vent is not legal in every state - so if your project is under inspection, then you should call your local Building Dept. and inquire about local Code. This is what it looks like:

Milo's a bear on code. If a AAV works for you then install it. Do not enclose it inside a wall. Keep it out where it can be serviced if necessary. Good luck. Tom