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Cast concrete chimney vent - Forno Bravo Forum: The Wood-Fired Oven Community

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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.
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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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Cast concrete chimney vent

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  • Cast concrete chimney vent

    I'm getting towards the end of my build and having had enough of cutting firebricks I've decided to make a cast concrete vent for the chimney connecting plate which will be the male part of the connection.

    This will of course get very hot, so can anyone please tell me what's the best recipe to use for the concrete?

  • #2
    Re: Cast concrete chimney vent

    This will of course get very hot, so can anyone please tell me what's the best recipe to use for the concrete?
    You want to use a castable refractory product for this use, reinforced with stainless steel needles. Regular concrete will spall and crack, and shouldn't be used unless you line it with refractory flue liner, and provide an expansion space between the concrete and the outer chimney.

    Once you get a quote on refractory concrete, you may think twice about cutting more bricks.
    My geodesic oven project: part 1, part 2

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    • #3
      Re: Cast concrete chimney vent

      Do a search on KS-4, the castable refractory I used to see comments.

      It was not very expensive and for a vent transition you will need only 1, 55lb bag/bucket. I bought it here;Empire Refractory Specialists Shopping Cart
      Wade Lively

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      • #4
        Re: Cast concrete chimney vent

        Portland cement based concrete is susceptible to heat. It will start giving up its strength if it reaches about 650 degrees.

        Successive heating cycles will cause it to deteriorate.

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        • #5
          Re: Cast concrete chimney vent

          I would put a liner in the chimney to reduce the heat deterioration.
          Looking for chimney liners in Canada.

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          • #6
            Re: Cast concrete chimney vent

            Due to the unique shape of my vent I'm thinking of casting my vent as well.
            I could also use the castable for the shallow landing as well, where it meets the oven floor.

            George
            George

            My 34" WFO build

            Weber 22-OTG / Ugly Drum Smoker / 34" WFO

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            • #7
              Re: Cast concrete chimney vent

              George,
              check out the link by lcripe just below your post. He did an excellent job of casting a chimney vent transition.
              Eric

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