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  1. #1
    Join Date
    Jan 2011
    Posts
    2

    Default Septic gases from rooftop vent reaching ground

    When the wind blows from a certain direction, the septic odors from the vent on the roof of my home seem to curl down to the ground level. They are quite noticeable and strong along the side of the house. The septic system functions correctly, and there is no sign of tank or leach field liquids rising to the surface of the ground. The roof is a 10 pitch, and the vent extends about 18" above the roof surface, and is located about 8 feet in from the gable end, and about 2 feet down from the peak. Intuition tells me that the wind is forming an eddy on the downwind side of the house, causing the air and septic gases to curl downward to the ground level.
    Is this a common problem, and what could a possible solution be? Would extending the vent pipe be an option?
    Thanks so much!
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  2. #2
    Join Date
    Aug 2007
    Posts
    612

    Default Re: Septic gases from rooftop vent reaching ground

    I had a similar issue, extended the vent pipe about 2' and that solved the issue. Your wind currents may require a different length pipe.

  3. #3
    Join Date
    May 2008
    Location
    Pacific Northwet
    Posts
    1,908

    Default Re: Septic gases from rooftop vent reaching ground

    It may also be that the vent pipe is too long. Vents are usually 10-12" above the roof; there may be "dead air" space closer to the roof and if the vent vented a little lower, it wouldn't be blown to the ground.

    Just a thought.
    The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.

  4. #4
    Join Date
    Jan 2011
    Posts
    2

    Default Re: Septic gases from rooftop vent reaching ground

    Thanks so much for the replies. I guess I flip a coin to see if I try a longer or shorter pipe. Has anyone had any experience with these charcoal filters that are designed for stack vents? I'm considering that idea as well.

  5. #5
    Join Date
    Aug 2007
    Location
    Maryland
    Posts
    2,009

    Default Re: Septic gases from rooftop vent reaching ground

    I used charcoal filters from Wolverine on my own house and it solved the same problem. All the vents need to have filters installed. It's been a number of years & I haven't replaced the filters and they still work fine & I haven't had any issues with the plumbing.

  6. #6
    Join Date
    May 2008
    Location
    Pacific Northwet
    Posts
    1,908

    Default Re: Septic gases from rooftop vent reaching ground

    Quote Originally Posted by bilder View Post
    Thanks so much for the replies. I guess I flip a coin to see if I try a longer or shorter pipe. Has anyone had any experience with these charcoal filters that are designed for stack vents? I'm considering that idea as well.
    Just remember, it's always easier to cut a pipe shorter than it is to lengthen it. As much as journeyman plumbers would like apprentices to believe it, a pipe stretcher just isn't part of their toolkit.
    The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.

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