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Old 01-25-2012, 03:33 PM   #1
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Venting Question!


Hello,
I've never asked a question here, but get SO much out of this board from reading other topics. This is really a great thing you guys are doing and your time replying is appreciated! I just had a G.C install my rough in and noticed that the laundry drain is hooked up downstream from the vent! I'm not sure, but I believe this is wrong. SO, I guess my question is does a drain hooked up downstream from a vent mean it isn't vented?? plz help

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Old 01-25-2012, 03:52 PM   #2
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Vent should be downstream of trap. What did your G.C. say and why is he plumbing anyways?

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Old 01-25-2012, 05:47 PM   #3
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I thought he was a plumber and turns out he's more like a g.c. what kinds of things should I worry about happening beacuse the vent is upstream to the laundry?
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Old 01-25-2012, 06:15 PM   #4
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I read somewhere else that the washing machine hose usually lets enough air in to where it doesn't need to be vented... is that true???
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Old 01-25-2012, 06:35 PM   #5
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If you could post a picture of the rough in that would get the best answer---Mike---

The laundry set up should be a 2" pipe with a P- trap
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Old 01-26-2012, 12:43 AM   #6
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Originally Posted by Smith1158 View Post
I read somewhere else that the washing machine hose usually lets enough air in to where it doesn't need to be vented... is that true???
Washing machine line should definately have a full sized vent to it,but dont take my word for it .
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Old 01-26-2012, 04:35 AM   #7
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see if this photo of a washing machine standpipe and a laundry sink rough in helps
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Old 01-26-2012, 07:21 AM   #8
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That is one tall stand pipe!
Sink is also really close to washer tie in
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Old 01-26-2012, 02:30 PM   #9
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Sink is also really close to washer tie in
Depends on your definition of really close.

I guess the laundry tub stub out could of been put in the next room(to the right in the photo) but why? How much room does someone need between the washer and sink??

How wide is your washer and how wide is your laundry sink?

No comment on the height of the standpipe though.

Last edited by hammerlane; 01-26-2012 at 02:32 PM.
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Old 01-26-2012, 03:08 PM   #10
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If you are replacing your laundry sink, why do you need the standpipe? Drain into the sink.
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Old 01-26-2012, 06:22 PM   #11
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If you are replacing your laundry sink, why do you need the standpipe? Drain into the sink.
Because for whatever reason you do not want to drain into the laundry sink.

I personally think having the standpipe is a cleaner look rather than draining into a sink but thats me.
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Old 01-26-2012, 06:26 PM   #12
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Depends on your definition of really close.

I guess the laundry tub stub out could of been put in the next room(to the right in the photo) but why? How much room does someone need between the washer and sink??

How wide is your washer and how wide is your laundry sink?

No comment on the height of the standpipe though.
Normally the tie ins should be seperated by 5' off pipe and the washer should be independent to the 3".
But as has been said a lot lately,im just a hack so check with cold iron or devil plumber666 just to be safe!
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Old 01-26-2012, 06:37 PM   #13
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Normally the tie ins should be seperated by 5' off pipe
Do you mean their respective San-T's on the main stack should be separated by 5' of pipe?

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and the washer should be independent to the 3"
I do not follow what you are trying to convey with the above statement.
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Old 01-26-2012, 06:46 PM   #14
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Do you mean their respective San-T's on the main stack should be separated by 5' of pipe?



I do not follow what you are trying to convey with the above statement.
Couldnt tell from your picture if that was a 3" pvc stack or not
The five feet of seperation is to avoid another line or fixture from being loaded up with soap from washing machine when it drains.
Is there any other fixtures above the washing machine vent tie in on that stack?
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Old 01-26-2012, 10:54 PM   #15
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The five feet of seperation is to avoid another line or fixture from being loaded up with soap from washing machine when it drains.
Again. Where are you saying there should be 5' of separation.?
I reinserted the photo and numbered all fittings so that nothing can be lost in translation. As a note the stack is 2" not 3". This is not my work or my setup. It was another post on this site about 2 months ago. I saved the photo.




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Is there any other fixtures above the washing machine vent tie in on that stack?
I do not know. This is not my work. Assuming that there are no other fixtures draining into the 2" stack above fitting #5 this would be OK.
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