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-   -   Sewer gas from basement fixtures (https://www.askmehelpdesk.com/showthread.php?t=299528)

  • Jan 5, 2009, 03:48 PM
    SMB1968
    Sewer gas from basement fixtures
    Hello all,
    We have a basement (full) bathroom that is just slightly above grade (I suspect it wouldn't even be allowed under current code -- it is an old house). The bathroom is right next to the outgoing sewer line to our septic tank & the toilet often gurgles and sewer gas comes through (maybe even through the showet stall) when upstairs toilets or showers are used. I'm trying to find a way to eliminate these odors. I read about backflow valves, but I haven't run across anyone using one for this purpose. In our utility room I can see where the line from the downstairs bathroom runs into the main sewer line, so it is accessible. Would this work? Any other advice?
    Thanks
    Scott
  • Jan 5, 2009, 04:12 PM
    21boat

    You never put a check valve on a sewer line to the septic. Your problem is there is not good venting on that line after the toilet. The sewer gas builds up in the line to the tank and bubbles in the toilet to vent that gas build up. As Long as you have drainage to the outgoing sewer line and there isn't standing water out in the sewer line you need a 2" PVC vent within 5' of the toilet. The vent needs to tied into the main stack vent for the house or run up and out the house roof. check to see if you have a vent already after the toilet and if not, thats the problem "venting

    21 Boat

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  • Jan 5, 2009, 05:05 PM
    SMB1968
    Thank you for the quick reply. I'll take a look at the venting issue.
    Scott
  • Jan 5, 2009, 06:14 PM
    mygirlsdad77

    Yep, sounds like a vent issue, as 21 stated.

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