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  1. #1
    Join Date
    Sep 2008
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    so so, California
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    Default Gap in fire stop

    Hey Bob,
    In reference to the gap in the fire stop; just wondering if you feel this is somewhat excessive?
    I though i remember Dale F. saying that the largst gap between the flue and the firestop should be around 1/8-3/16"...did I remember that correct?

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  2. #2
    Join Date
    Mar 2007
    Location
    Near Philly, Pa.
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    Cool Re: Gap in fire stop

    From UL 127 7.3.2 Firestop spacers
    "...The inside diameter of the firestop opening shall not be more than 1/8 inch greater than the outside diameter of the chimney pipe, including chimney joints and raised projections."

    If you measure the chimney at its widest point, which is usually the outer female hub of the section above, it should not be less than 1/8 inch than the actual diameter of the FS opening. You cannot go by crude meansurements in the field but moreover, unless there are signs of someone enlarging this hole then verification of a listing sticker to match that fireplace make and model is all a HI should concern themselves with.

    hth

    Keep the fire in the fireplace.

  3. #3
    Join Date
    Sep 2008
    Location
    so so, California
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    Default Re: Gap in fire stop

    Very good Bob, excellent info, thank you.

    Last edited by Marc M; 04-20-2011 at 10:40 PM.
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