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  1. #1
    Join Date
    Jun 2007
    Farmington, MN

    Default Flue pipe under grade, is it allowed?

    Got what appears to be a stainless double walled flue pipe buried about 2 foot below grade for a basement gas wood stove. I have never seen one buried before. Is this allowed?

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  2. #2
    Join Date
    Feb 2009
    Southern Vancouver Island

    Default Re: Flue pipe under grade, is it allowed?

    Is it purposely buried with soil, or is that just a lot of windblown debris? It is wrong either way. The seams and that tee need to be visible for monitoring. Soil and debris will hold moisture against the metal and that will lead to premature corrosion.

    No doubt, Sir Bob Harper will supply the final judgement.

    John Kogel, RHI, BC HI Lic #47455

  3. #3
    Join Date
    Mar 2007

    Default Re: Flue pipe under grade, is it allowed?

    I have run into clay flue liners covered in concrete underground, by a certain builer I think was on something.
    That was acepted locally here in ct, why I don't know but most still in use for 40 years or so.
    But that, I have never seen and would agree with john that it is trouble.
    Call the local building dept for their take on it.
    It's not a dumb question.
    You're relationship with your client depends on your willingness to help them.
    You started here, geed
    now go further and check with the locals
    bring a banjo

  4. #4
    Join Date
    Oct 2011
    Minneapolis, MN

    Default Re: Flue pipe under grade, is it allowed?

    Maybe this is a dumb question, but what's a gas wood stove?

    Do not think of knocking out another person's brains because he differs in opinion from you. It would be as rational to knock yourself on the head because you differ from yourself ten years ago.
    - James Burgh, 1754.

  5. #5
    Join Date
    Mar 2007
    Near Philly, Pa.

    Cool wood gas stove?

    Now, if it was phrased "gasified wood stove" it would be more correct than "wood stove". If the stove is straight up gas stove, then this is a 'vent'. Otherwise, it would be called a 'chimney' for a solid fuel application.

    Regardless, it will carry a stated clearance to combustibles, which is an air space. You cannot bury chimney or vents into soil. The listings do not allow it nor do mfrs. instructions.

    As always, it would REALLY help if you can provide the model and mfg date code of the appliance, ANSI listing, and fuel type. Also, the venting will have some identification as to the mfr. and type of venting.

    This venting configuration would need to be cross-checked against both the appliance and vent mfr. for acceptability. Regardless, the pipe is not only in direct contact but this portion of it cannot be inspected and it is not properly supported.

    Any other pics inside or out? Where does it terminate?

    Keep the fire in the fireplace.

  6. #6
    Join Date
    Jul 2008
    Snowbird (this means I'm retired and migrate between locations), FL/MI

    Default Re: Flue pipe under grade, is it allowed?

    It would likewise be of interest just how this chimney penetrates/breaches the block foundation wall, thimble, etc. and what is on the originating end.


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