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Vermiculite after curing? - Forno Bravo Forum: The Wood-Fired Oven Community

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Dear forum users,
Thank you for your patience with the Photo galleries. We've got your galleries online!
We have finished writing a custom script to migrate the PhotoPlog to vBulletin5’s albums.

Unfortunately V-Bulletin killed the "Photoplogs" in their software upgrade which was unforeseen and we're the first development group to have written a script for getting the galleries back... that said, it took some time to reverse engineer the code and get the albums to move over seamlessly!

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Vermiculite after curing?

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  • Vermiculite after curing?

    I am just about done with the dome, so I am now starting to think through the final process. I will be curing with vermiculite all around the exterior of the oven. However, I was planning on curing the oven prior to adding the exterior insulation (to be able to see cracks and correct if necessary).

    When I add the external vermiculite, will moisture get back in? Do I essentially need to cure the oven twice in that case?

    Thanks!

  • #2
    Re: Vermiculite after curing?

    Yes, vermiculite absorbs LOTS of water. It's why it's used as a soil conditioner in agricultural use. Once you pile on your vermiculite concrete, it will be wet all over again.

    This doesn't apply if you're building an enclosure, and pouring the vermiculite in loose.
    My geodesic oven project: part 1, part 2

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    • #3
      Re: Vermiculite after curing?

      I am building an enclosure. Would pouring in loose vermiculite have the same thermal benefits as the vermiculite/cement combination? Six inches of loose vermiculite and I am good?

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      • #4
        Re: Vermiculite after curing?

        Originally posted by phippsj View Post
        Would pouring in loose vermiculite have the same thermal benefits as the vermiculite/cement combination?
        Probably better than vermicrete as it doesn't have the binding cement to transfer what small amount of heat it transfers.

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        • #5
          Re: Vermiculite after curing?

          Originally posted by dmun View Post
          This doesn't apply if you're building an enclosure, and pouring the vermiculite in loose.
          I'm building an enclosure and using 3 inches of insulation-blanket around the oven. A neighbor from southern France says they fill the enclosure with sand. Is vermiculite much better than sand?

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          • #6
            Re: Vermiculite after curing?

            Originally posted by Bambalorna View Post
            Is vermiculite much better than sand?
            Yes. Sand is more an addition to oven mass than real insulation.

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            • #7
              Re: Vermiculite after curing?

              One advantage of a weak vermiculite/cement (12:1) mix for the dome insulation that it will eliminate loose vermiculite from seeping or blowing out of joints in your enclosure. (In any case, your enclosure should be well vented to keep the insulation dry.)

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              • #8
                Re: Vermiculite after curing?

                Originally posted by Laku View Post
                Yes. Sand is more an addition to oven mass than real insulation.
                Thank you Laku, much appreciated

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