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Masonry chimney questions - Forno Bravo Forum: The Wood-Fired Oven Community

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I'm Peter Reinhart! Ask Me Anything! Monday, February 15, 2016 7:00-8:00 pm EST

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.

Ask Me Anything New Forum Feature

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.

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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Masonry chimney questions

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  • Masonry chimney questions

    I am about to start construction on a masonry chimney but have some questions about my design:

    I have two 8-inch diameter, 12-inch tall flue liners. I was planning on mortaring them together to make a 24-inch tall chimney but am not sure whether I need that height. I am considering using just one of them. Are there any considerations besides zoning restrictions that would make having a shorter chimney a bad idea?

    I am going to build a brick chimney tower around the flue liner with regular clay brick and an air gap between the flue liner and the tower. Will the heat from the flue liner be too much for the non-firebrick tower or should I use firebrick to make the tower?

    I am also going to fabricate a steel buttress frame for the brick tower to distribute the weight so it is not all centered on the arch. Are there any considerations about such a strategy?

    Thanks - C

  • #2
    Re: Masonry chimney questions

    The higher the better for draw. You should not need any additional support for the arch, so long as it is sufficiently buttressed.

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    • #3
      Re: Masonry chimney questions

      Originally posted by Cyungle View Post
      I am about to start construction on a masonry chimney but have some questions about my design:

      I have two 8-inch diameter, 12-inch tall flue liners. I was planning on mortaring them together to make a 24-inch tall chimney but am not sure whether I need that height. I am considering using just one of them. Are there any considerations besides zoning restrictions that would make having a shorter chimney a bad idea?

      There are combustible clearances to consider, as far as zoning, that is a local issue. In my experience, there are little specific zoning restrictions pertaining to outdoor wood burning units, beyond common sense stuff.

      I am going to build a brick chimney tower around the flue liner with regular clay brick and an air gap between the flue liner and the tower. Will the heat from the flue liner be too much for the non-firebrick tower or should I use firebrick to make the tower?

      No need to use firebrick for the chimney and an air space between the flue and chimney is proper masonry practice

      I am also going to fabricate a steel buttress frame for the brick tower to distribute the weight so it is not all centered on the arch. Are there any considerations about such a strategy?

      What kind of an arch do you have? Centering the load on the arch is exactly where you want it.

      Thanks - C
      See above in bold.....
      Old World Stone & Garden

      Current WFO build - Dry Stone Base & Gothic Vault

      When we build, let us think that we build for ever.
      John Ruskin

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      • #4
        Re: Masonry chimney questions

        Why do you need the flue liner?
        The English language was invented by people who couldnt spell.

        My Build.

        Books.

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        • #5
          Re: Masonry chimney questions

          They are not susceptible to heat damage like building brick, they protect the chimney, and they create a smooth chase for the gasses and smoke to escape.
          Old World Stone & Garden

          Current WFO build - Dry Stone Base & Gothic Vault

          When we build, let us think that we build for ever.
          John Ruskin

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