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Simple question and probably stupid question...but this forum is generous

Post in 'DIY and General non-hearth advice' started by JPapiPE, Jul 11, 2008.

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  1. JPapiPE

    JPapiPE New Member

    Joined:
    Jun 10, 2008
    Messages:
    408
    Loc:
    South-West hills of Maine, Red Neck Country
    What is the clearance for HT A-type chimney as it goes thru the roof and attic? I have an insulated attic and think the clearance is 2" I also have a 1/2" decking (roof sheathing) beneath my metal roof. and suspect the clearances should be 2" around the wood roof sheathing, but could come in contact with my metal roof. Is any of this correct?

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  2. Highbeam

    Highbeam Minister of Fire

    Joined:
    Dec 28, 2006
    Messages:
    8,797
    Loc:
    base of Mt. Rainier on the wet side, WA
    My installer cut the roof hole (sheeting and comp roof) large enough to provide the 2" required clearance. The 2" is clearance to combustibles so you could make a case that the metal part of your roof is non-combustible but the sheathing has to be cut anyway.
  3. JPapiPE

    JPapiPE New Member

    Joined:
    Jun 10, 2008
    Messages:
    408
    Loc:
    South-West hills of Maine, Red Neck Country
    When you say 2" clearance you mean 2" all the around the chimney right? So the total hole would be 4" larger than the pipe diameter. Example a 6" pipe would require a 10" hole from my combustible roof sheathing and also a 10" clearance where my chimney passes through my insulation? Giving it 2" on all sides. Is this correct?
    Thanks so much , I do think i understand this principle
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