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Old 02-17-2016, 11:41 AM   #1
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Washing Machine Plumbing Vent


I just cut into my wall to replace some shut off valves for my washing machine and noticed my drain pipe does not have a trap or vent. The 1.5" drain pipe drops about 4' from the main level to the basement where it converts to a 3" pipe and bends to follow the floor joist. That 3" pipe then connects with the kitchen sink drain and continues to the main vertical drain feeding to the septic.

I've never had an issue which I assume is attributed to two things:
1. I don't have a trap.
2.The 3" pipe is only flowing the small amount of water from the washing machine. I'd like to think that the water never completely fills the line so air is able to back fill over the top, and no vacuum is created.

Adding a vent to the roof will require completely ripping apart the room to connect into another vent. Does anyone have any recommendations?
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Old 02-17-2016, 11:52 AM   #2
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Welcome to the forum eckie.

Maybe they had the same thought as you when it was done. Everything works, no sewer gas smell, and drains fine. Doesnt mean its right.

Please wait for one of the plumbers to respond, they will know the proper codes for septic systems. Thanks.

Please post some pics. I responded to your post so you should be able to post a couple pics of your set-up for the plumbers to look at so they can give you better advice/suggestions. Thanks.

Last edited by jmon; 02-17-2016 at 12:14 PM.
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Old 02-17-2016, 11:57 AM   #3
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Washing machines also require a 2" drain.
Without a trap the sewer gas is leaking into the room.
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Old 02-17-2016, 11:59 AM   #4
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when you say a 3 inch pipe connects to the kitchen sink drain? what size is the kitchen sink drain? any pictures would help, and its definitely not piped correct..many things will work, but are not right..
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Old 02-18-2016, 07:56 AM   #5
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Thanks everyone I'm still waiting to have the picture feature unlocks. Once i'm able, i'll upload a few pictures.
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Old 02-18-2016, 03:05 PM   #6
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in a pinch, you could add a trap and use an AAV if your town allows it. I did the same thing for my washing machine and haven't had any issues.
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Old 02-18-2016, 03:27 PM   #7
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How does it not stink like sewer gas in there? Everytime I've broken open a sewer line it's stunk up the whole room in minutes.
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