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Insulating the flue?? - Forno Bravo Forum: The Wood-Fired Oven Community



New Forno Bravo Forum Feature

Forno Bravo Forum Community,

You will notice a new forum at the top of the main page called, "Ask Me Anything". This forum will be used for live one hour "Ask Me Anything" (AMA) sessions hosted by people who are knowledgeable in different areas pertaining to wood fired ovens. How it works:
- Each AMA will have a "sticky" thread where the community can post questions they would like answered during the live session. This will allow everyone to participate even if you can't be online for the live session. These questions will not be answered by the host until the live AMA; if you need an answer quickly, you should post it in the appropriate Forum area for the community to respond.
- Another thread will be posted for the live AMA. Registered users who are logged in during the live session can interact with the host by asking questions and receiving responses.
- The live thread will remain in the AMA forum to view after the session.

To kick off our AMA feature, we have invited author, chef and master bread maker and host of Pizza Quest, Peter Reinhart, to be our first host! Peter will be in the Forum on Monday, February 15th, from 7:00 - 8:00 pm EST. If you are unable to be online during the live session, you can post your questions in the sticky post. Peter will answer those questions during the live session on February 15th. You can view Peter's answers to your questions as well as what happened during the live session in the session thread.

We hope you enjoy this new feature! Please let us know if there is a topic that you'd like to have as an AMA and we'll look for a host!

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Insulating the flue??

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  • Insulating the flue??

    Hi all,

    Have been on the site for a while now but have only just recently been able to work on the WFO. Would like to say a quick thank you to the forum and all the guys for being a great source of advice. I could not have gone this far without the help of this awesome community!!!! you guys rock!!

    I have just finished building a 48" dome and am about to attach a 6" galv flue on top of the vent. I have a guy making me an 8" clay flue to cover the 6" and have half a bag of vermiculite left over from the insulating slab. Can I / should I pour this loose between the 6" and 8" flues??

    I live in quite a rural area and would like the oven as insulated as possible to reduce any fire risk. Will also be putting a spark arrestor on the flue and a stainless mesh door for firing the oven.

    Any comments would be appreciated.


  • #2
    Re: Insulating the flue??

    Your plan should work fine, except the galvanized stove pipe liner. First - ofgassing hot zinc is not something you want around food, second - it's likely to rot out from corrosion is two or three seasons. I'd spring for stainless pipe here if you can get it, if not, get the black stuff they sell to go with woodstoves.

    A final consideration: six inch is a small flue, and 48 is a large oven. If you want to avoid smoke leakage on startup, you may want to switch to an 8.
    My geodesic oven project: part 1, part 2


    • #3
      Re: Insulating the flue??

      Hi dmun,

      Thanx for the reply.

      Would it be better just to use the 8" clay flue?

      Would this get too hot? or is a double flue just overkill?