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Old 08-20-2009, 03:07 PM   #1
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Vent for a washing machine drain

I have an older frame home and the plumbing is in need of updating. My problem is: The washer drain comes from the standard set up behind the washer(plastic "box with hot and cold water facets and drain hole in the middle) 2in drain pipe (PVC)goes down thru the floor and is 90 degreed to the "S' trap,2in pvc line goes to kitchen sinkand is tee'd forthe sink trap then on to the bath, then on to the septic tank. Question: When the washer drains it gurgles in the sink so that tells me I need a vent for the washer, right? where do I install one before or after the S trap of the washer? Can I use a 2in tee upright and a 45 or 90 and run outside of the house?ON the outside how high should the vent go?

I told you I would have lots of questions lol


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Old 08-22-2009, 05:13 PM   #2
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Install the vent after the p trap. Check with your local Building Inspection Department for all local code questions. You should be able to run the vent pipe up the outside wall to up near the eave, but be aware of the possiblility of sewer gas getting into open windows, near patios, etc.
You may need a permit and inspection. Keep everything clean with proper records if you ever want to sell the property.
Good Luck!


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Old 08-23-2009, 08:24 PM   #3
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Just fit a AAV to the pipe before the trap. Instructions on how to install this will be on the AAV box. You don't need to vent to atmosphere.
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Old 08-23-2009, 08:51 PM   #4
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Check with your local codes before adding an AAV. AAV's are a handymans fix to anything. Do it right and add a vent.

Some codes DO NOT ALLOW AAV's. In 15 yrs I have to use an AAV once.

The reason that I don't use AAV is because of seal failure. Spiders and nats can get in the seal and cause failure.

Do it right and do it once.
John Wayne once said "Life is tough and it is even tougher if you are stupid"

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