Dumb, probably repeat laundry standpipe question

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davgoo

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If I'm using 2" pipe and I'm within 5' of the main 4" drain stack, can I just tie a laundry standpipe to it and be done without additional venting? Thanks!
 

davgoo

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Fair enough. Can I tie back into that same stack as a vent, like I attached?
 

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davgoo

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So realistically I'm looking at an AAV (if permitted, I haven't researched) or ... what? There's no existing plumbing down here so ... tying into the dry side of the kitchen plumbing upstairs? Running a new vent up through two stories to the roof?
 

Mik_15

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I'm fairly new to this whole plumbing gig but as I understand it, yes, you would have to run the vent to the floor above and have it tie into an existing vent, or add a new one to the stack above the highest fixture (existing vents should be like this) for it to be correct.

Someone chime in if this is wrong.
 

davgoo

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You can't wet vent between floors. The waste develops too much speed down the pipe for that to work.
Wet venting is for bathroom sets, on the same floor. You don't drop toilet waste over anything. That's called siphoning the p-trap, not venting.
Install an AAV on the trap arm, at the least.

I won't ask anyone to speak to Iowa code, but from a "good plumbing ideas" perspective, is an AAV sufficient for a clothes washer?


/eta reminder of use case
 

Cacher_Chick

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If you are not being inspected, you can try it. If the room fills with sewer gas, it's a pretty clear indication that the trap is siphoning.
Using a long riser for the vent will help to protect the AAV from becoming contaminated
 

davgoo

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OK, reanimating an old thread, sorry. Still thinking about this project.

Since I'm working in the basement, and there's a floor drain, I think there's a vent for the drain... It's not as close as in this example photo but I can't imagine what else it could be.

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Two questions.
1) How can I prove that pipe's the vent for the floor drain and nothing else? Instinctively I'm thinking I turn on every faucet in the house and listen for water running down the pipe, but is there a better way?
2) If it is the floor drain vent, is it safe to assume that I can vent the washer to this pipe above the flood level of the washer? Thanks!
 

Cacher_Chick

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If it is a dry vent, then yes, you can tie in another fixture vent. The new vent coming from the standpipe must be pitched to drain any incoming rainwater and/or condensation.
 

davgoo

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And I guess additionally, can I drain the washer into this? I think the answer is no because the washer would siphon the floor's trap out?
 
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