hombrewdude wrote:
My old machine was routed direct to the laundry sink.
I bought a new machine, and I want to get the plumbing out of the
sink..

All of my drain pipes in my 30yr old house are 1-1/2" ABS

My kitchen sink drain runs directly behind my washing machine
Sink is upstairs, machine is in the basement.

so...

I plan on adding a 1-1/2 tee near the floor
Off the T a p trap
Off the p trap a standpipe - taller then the washer machine
Then attach the washer machine hose to the top.

Any problems with this?
I have read I should have 2" drain pipe. but all of my pipe is 1-1/2"

I checked all the responses. I don't have the 1 1/2"
problem, but when I moved in the washer had been backing
up periodically for years. I got tired of it and had
the drain replaced. The plumber offered to do it the
cheap way. He punched a hole in the foundation and
ran the new drain through that. The whole drain
assembly is exposed. He added a vent by running the
vent pipe up the wall about 7 feet and putting one of
the one way valves on top of it. So if you are in the
garage you can do it that way.

I have also seen sink draings vented using the same
technique under the cabinet. I expect the vent needs
to be above the level of the trap.

Bill Gill