Venting Question!

Smith1158

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

TheEplumber

Vent should be downstream of trap. What did your G.C. say and why is he plumbing anyways?

Smith1158

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?

Smith1158

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???

oh'mike

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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plummen

Washing machine line should definately have a full sized vent to it,but dont take my word for it .

hammerlane

see if this photo of a washing machine standpipe and a laundry sink rough in helps

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plummen

That is one tall stand pipe!
Sink is also really close to washer tie in

hammerlane

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.

47_47

If you are replacing your laundry sink, why do you need the standpipe? Drain into the sink.

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What we've got here is... failure to communicate. Some men you just can't reach. So you get what we had here last week, which is the way he wants it... well, he gets it.

hammerlane

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.

plummen

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!

hammerlane

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.

plummen

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?

hammerlane

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.




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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