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    ekim's Avatar
    ekim Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Nov 19, 2007, 03:32 PM
    Stinky drain
    My problem is I am getting a very bad septic smell from my downstairs bathroom.My investigating has determined that the trap is not staying full of water.My question is does the plumbing vent belong before the trap or should it be after the trap.My sinks in both our bathrooms do not vent before the trap and I do not get smells from those or any other drains in the house.
    All help appreciated
    Yours smelly big fig:eek:
    tickle's Avatar
    tickle Posts: 23,796, Reputation: 2674
    Expert
    		  
    #2

    Nov 19, 2007, 03:54 PM
    Dear smelly big fig, why don't you follow the rule of thumb with the other drains that you don't get a smell from. Would this be a big undertaking should you corrrect it ?

    I will probably get shot down from some of our experts, but I couldn't resist your sign off name so that's why I answered. :)
    ekim's Avatar
    ekim Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Nov 19, 2007, 04:00 PM
    I have been considering this but am not sure if this will vacumn lock the drain.Also worried that this may cause other drain problems through out the house.Thanks for your response any ideas from all would be great!
    Big fig out:cool:
    mikeperr's Avatar
    mikeperr Posts: 5, Reputation: 1
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    #4

    Nov 19, 2007, 10:25 PM
    Most likely you vent line is blocked and need to be snaked. When the line is not getting its vent air your trap seal will be siphoned out.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #5

    Nov 20, 2007, 05:51 AM
    My question is does the plumbing vent belong before the trap or should it be after the trap.
    The vent should install downstream,(after) from the trap. If you have one installed before the trap tyen you have a unvented fixture and the suction caused by the drainage could very well lower the trap seal to the point of allowing sewer gas to escape. Regards, Tom
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