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    supercat's Avatar
    supercat Posts: 8, Reputation: 1
    New Member
    		  
    #1

    Jan 30, 2010, 09:29 AM
    Venting a basement sink
    I have a 10` peace of pipe under my basement floor that is not vented. It is clean. I snaked it. But my washer water still backs up Is not having a vent the problem??
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #2

    Jan 30, 2010, 09:36 AM

    10' long but what diameter" Can you take a picture?
    supercat's Avatar
    supercat Posts: 8, Reputation: 1
    New Member
    		  
    #3

    Jan 30, 2010, 10:03 AM

    It looks to be about 2 1/2" or 3". It is all under a concrete floor.
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #4

    Jan 30, 2010, 10:23 AM

    A 2" or larger is what you need, if it still backs up you aren't rodding it fully. What are you rodding with?
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #5

    Jan 30, 2010, 11:12 AM

    Please start with the washer and tell us how it's piped. Telling us that your drainage's under the slab doesn't help. Is there a stand pipe that's trapped? Could you install a AAV, (see image) just downstream from the trap? Let's have more details. Regards, Tom
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