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chimney clearance?

kevin coppinger_4
kevin coppinger_4 Member Posts: 2,124
in THE MAIN WALL
a Stainless steel liner to a masonary chimney in an oil fired application does that now change the clearance requirement of 2" to combustibles? you are no longer heating the brick...it is mearly acting as a conduit...yea or nea? kpc

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Comments

  • Maine Ken
    Maine Ken Member Posts: 531


    The chimney is still the chimney. Two inches is still two inches. Lined, unlined, tile, supaflu, double brick, stainless it is all two inches from the outside.

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  • Bob Harper_2
    Bob Harper_2 Member Posts: 54
    liners

    The codes are not retroactive. You are not expected to remodel the home to meet the clearance. However, when you reline with a listed liner, the clearances of the listing apply. All oil liners I'm aware of allow for a zero clearance to the interior of the flue and a zero clearance to the exterior without any special insulation. Same with gas. Wood is another matter. You must insulate and how much insulation is based upon a Level II inspection, which includes determining clearances.

    The liner instructions should clarify this but if not, contact the liner mfr. or even the testing lab such as UL, Warnock Hersey, ETL, OMNI, etc.

    HTH,
    Hearthman
  • Paul Fredricks_3
    Paul Fredricks_3 Member Posts: 1,557
    I may be wrong....

    ...but I think the 2" clearance isn't for heat. IT has to do with the chimney collapsing if the house comes down, or something like that. If the framing is right up against the chimney it can drag the chimney down too, which can be a safety problem for fire fighters.
  • Robert O'Connor_12
    Robert O'Connor_12 Member Posts: 728
    yea

    Chimneys and vents shall have airspace clearance to combustables in accordance with the International Building Code and the chimney or vent manufacturer's installation instructions. Noncombustable fire-blocking shall be provided in accordance with the International Building Code.

    The exception to this would be that masonry chimneys equipped with a chimney lining system tested and listed for installation in chimneys in contact with combustables in accordance with UL 1777, and installed in accordance with the manufacturer's instructions, shall not be required to have clearance between combustable materials and exterior surfaces of the masonry chimney.


    Robert O'Connor/NJ
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