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Old 11-28-2006, 07:10 PM   #1
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Sewer gas from Laundry drain


I have roughed in my plumbing for my laundry (moved it to main level from basement) and I currently have the drain pipe plugged up with a plastic bag. The problem is that if I put my nose close to the drain I can really smell sewer gasses, and if I take the bag out....wow what a smell!!

My concern is that when I move my washer upstairs and install the drain line, that only just rests in the pipe, not sealed, the smell is going to be awfull.

Is there anything I should do or check? Should I have a P trap on the washer drain line?

I have the drywall up, but not mudded and taped, so I can remove it if need be. Although the drywaller is coming on Friday to finish it up.

Any ideas?

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Old 11-28-2006, 07:14 PM   #2
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wait a minute....to maybe answer my own question.

I have not used anything on this stack yet, or no water has gone down it yet. Does that mean the trap in the floor may be dry?

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Old 11-28-2006, 07:25 PM   #3
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Make sure theres water in the p-trap.
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Old 11-28-2006, 07:45 PM   #4
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I didn't install a p-trap? Is there one in the floor drains?
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Old 11-28-2006, 11:01 PM   #5
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Sewer gas from Laundry drain


Yes you need a P-Trap at the laundry.
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Old 11-29-2006, 10:15 AM   #6
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Oh, I thought that the force that the washer pushes the water out would empty a P-Trap? So thats not the case?

Thanks for your help!
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Old 11-29-2006, 11:23 AM   #7
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So where should I put my P trap? See attached.

D
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Old 11-29-2006, 03:00 PM   #8
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Sewer gas from Laundry drain


Quote:
Originally Posted by jeepwillies View Post
Oh, I thought that the force that the washer pushes the water out would empty a P-Trap? So thats not the case?

Thanks for your help!
That may be the case for the first rush of water, but what about the very last bit? There wouldn't be anyting driving it hard, thus it stays in the trap.
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Old 11-29-2006, 05:45 PM   #9
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Sewer gas from Laundry drain


Any idea on how to hook up the P trap in my situation?
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Old 11-29-2006, 05:55 PM   #10
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Cut in a tee and then the trap, is this vented?
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Old 11-29-2006, 05:58 PM   #11
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There is not a direct vent as it is not code. Should I direct vent it? Also based on my diagram, where would I put in the T?
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Old 11-29-2006, 06:05 PM   #12
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Sewer gas from Laundry drain


Here you go trap and drain should be 2"

Vent should be 1-1/2"
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Old 11-29-2006, 06:09 PM   #13
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Thanks RTP!
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Old 11-29-2006, 06:10 PM   #14
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Sewer gas from Laundry drain


Your welcome

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