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Author:
handywill (OH)
Hello,
I am finishing my basement and have a question about how to vent a washer. I have a washer going in about 12 feet from the main soil stack (cast iron, goes into floor, not “hung”), which I had a plumber put in a place that I can connect to with 2” PVC a while ago. The stack has various other things connected to it, including a toilet, sink, and a 3 inch line from an addition we had put on our house (which has its own vents). Next to the 4” stack, there is a smaller cast iron pipe that looks to be 1 1/2”, with only a slop sink going into it, and possibly more fixtures draining into it above. My question is could I tie into this 1 1/2” pipe (above where the sink drains into it) for an auxiliary vent/revent for the washer (red option in drawing)? The only problem I see is that the slop sink gurgles when it drains, which could be a venting issue. Another option would be to vent into the main stack, because that is obviously what the toilet is vented with, which works fine (blue option in drawing). The last (unfavorable) option is to use a Studor vent, which I’ve read don’t always work with washing machines (black option in drawing). Please see the attached drawing (and note that none of the fittings or slope of the pipes are correct at all, the drawing is just for a basic idea). Thank you!
Image link: [ibb.co]
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Author:
hj (AZ)
#1 is okay if you do NOT drop the horizontal line down the way you show it.
#2 is better
#3 is only if there is no other way, since water flow in the main stack CAN create a "positive" pressure against the AAV.
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Author:
handywill (OH)
Thank you for your reply. I think venting into the 1 1/2” stack the sink drains and vents into is my best option (by the way, it will not be dropping down like in the picture) because the main 4” stack is in between some joists and would be really hard to access. I guess another option would be not to trap the washer at all and just drain it into the sink, although that wouldn’t be very elegant. Thanks again!
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