I'm trying to put a washing machine in my storage closet that back onto the bathroom but the only thing I can tie into is the bath tub drain can this be done

I believe the answer is yes, assuming your bathtub drain is at least a 2 inch drain, and assuming you vent the new drain to the washer properly (and assuming your bathtub is properly vented). I am not aware of any codes that require more than 2 inches for a washing machine, but you may want to check to be sure.

Bath tubs rarely have 2" drains so check it out before cutting into it. Now if that were a shower stall I could almost guarantee its a 2" drain.

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Originally Posted by brenjan

i'm trying to put a washing machine in my storage closet that back onto the bathroom but the only thing i can tie into is the bath tub drain can this be done

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Yes it can be done. No it's not a good idea!
. You propose to connect the washer to the vertical tub waste pipe, correct?
The washer pump discharges with great force and volume. I can see the washer discharge coming up in a floor level outlet which would be your tub drain.
You would also be double trapping the washer which is against code.
If I've got it wrong and I'm mistaken about the way you plan on connecting click on back and correct me. Good luck, tom

Hello Brenjan: In my area we rough-in tubs with 2" drains and 1 1/2" vents. If you have 2" drain than you could connect the washer into tub vertical drain below the tub trap arm connection. Continue upward and reconnect with tub vent. See the drawing...

Looking at that drawing I am thinking this may be a problem. It is like discharging a washer into a stand pipe with no height. Excess water may back up into the vent but some will likely get pushed through the tub trap. Milo and/or Tom may have more thoughts on the hydraulics of this drain.

There is nothing wrong with that drawing.

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the only thing I can tie into is the bath tub drain

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The problem here is we're not quite sure what pipe he wants to connect to. Milo's thinking under the floor while I'm thinking the tub waste. It would be nice if he would come back and clear matters up. Regards, Tom

Oh, you are thinking he wants to cut into the overflow on the tub waste? If he does hopefully we can post another pic on "the lighter side of plumbing" before he has it fixed by a pro!