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    Brother Tim's Avatar
    Brother Tim Posts: 4, Reputation: 1
    New Member
    		  
    #1

    Mar 2, 2007, 11:33 AM
    Moved Washer upstairs, Q about venting
    I wish I had discovered this forum earlier...

    I moved my washer/dryer upstairs and had no trouble doing the plumbing, I thought :-)

    It is working fine so far, but after reading some posts it seems I may should have vented the washer drain.

    Currently it is on a 40" stack pipe. The P-trap is below the floor, and the drain line tee's into the sink's 1.5" drain eight feet from the washer's P-trap. Then the sink drain empties into a 6" drain about 12 feet later.

    So far no problems... I have not yet done the drywall behind the washer completely. Should I add a Studer AAV? The washer drain is not a tight fit, so I assume some natural venting is occurring, right?

    Thanks in advance!
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #2

    Mar 2, 2007, 12:22 PM
    That non-tight fit isn't going to help as much as you think. The vent should be after thetrap. A stuer vent would be a good option. Are you saying the sink drain isn't vented either? If it has a trap it should have a vent.
    Brother Tim's Avatar
    Brother Tim Posts: 4, Reputation: 1
    New Member
    		  
    #3

    Mar 2, 2007, 01:51 PM
    The sink is vented... all seems to be working fine... I was just wandering if the washer drain had to be vented or if the vent from the sink was OK. Thanks.
    doug238's Avatar
    doug238 Posts: 1,560, Reputation: 62
    Ultra Member
    		  
    #4

    Mar 2, 2007, 01:56 PM
    If the washing machine trap is not vented and not on a 3" trunk line then the flow of water could pull the trap dry.
    Brother Tim's Avatar
    Brother Tim Posts: 4, Reputation: 1
    New Member
    		  
    #5

    Mar 7, 2007, 07:41 AM
    Thanks Doug... that I understand (now). I could not understand why the vent went after the trap... duh... now I get it. I have had no problems doing 4 loads a day for 2 weeks now. SO I think the vent from the sink is sufficient, but if I have a problem I will have to put in a second trap + AAV after it or cut the flooring to access it. (The drywall is nearly finished in the basement!)

    Thanks everyone!

    I am a photographer. Guess I should go over some posts related to that and return the favor ;-)
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