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General 12-25-2010 07:28 AM

Adding washer to basement with no way to vent drain pipe
I've decided that putting a washer in the basement is the best choice (I was thinking about putting it in the kitchen at first) but the issue with the basement is the lack of a vent pipe. I have a cast drain pipe running horizontally thru the location that the washer would go, but there is no reasonable way to run a vent up to the roof.

There is a copper pipe from the kitchen sink running down into the cast drain pipe, would I be able to tap into that pipe to use as a washer drain since that pipe is vented above?

Would I be able to use a slop sink to drain the washer into so it has time to sit there if it drains slow?

Basically I am just looking for a way to drain the washing machine without a vent, if possible.


Work4living 12-25-2010 05:18 PM

Use an AAV air admittance valve... Basically it is a code approved mechanical vent.

General 12-25-2010 09:22 PM

S I would be able to insert this valve in the new drain pipe and run it into the existing cast drain pipe?

Work4living 12-26-2010 05:47 AM

Yes, basically you will tee off of the vertical drain pipe. This vertical line should be at least 2". Then you will need another tee on its back for the vent. And a ptrap for you washer drain. The aav has to be at least 4" above the washer drain ptrap. I prefer 6" above the flood rim of the washer approx 42" above the floor.

General 12-26-2010 08:39 AM

That sounds even simpler than I thought. The vertical copper drain is a 2" pipe coming down from the kitchen, I assume that none of the kitchen drainage will come out of the drain I install in the basement?

Work4living 12-26-2010 10:08 AM

You know what they say about assumptions. In this case yes you are correct. As long as there is no obstruction in the drain pipe i.e. a stoppage then you should have no problem with the sink drainage. If you are truly concerned you can install a sump check valve in the horizontal line before the aav tee.

General 12-26-2010 11:11 AM

What type of T should I put in the 2" copper line? Can I use a No-Hub type T fitting? Or does it have to be one of those T's with the downward sweep in it?

I appreciate all the help!

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