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Vermiculite cure time. - Forno Bravo Forum: The Wood-Fired Oven Community

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Vermiculite cure time.

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  • Vermiculite cure time.

    Hi all,

    Rookie builder here. I have just finished the vermiculite pour of my hearth, and I was wondering if someone could tell me what kind of cure time I can expect, also is there any needed curing of the vermic. layer as there was with the concrete layer?

    Thanks,
    John

  • #2
    Re: Vermiculite cure time.

    If it feels hard and setup.. you are fine to start building your dome.

    Mine was pretty hard the next day.
    My thread:
    http://www.fornobravo.com/forum/f8/d...ress-2476.html
    My costs:
    http://spreadsheets.google.com/pub?k...Xr0fvgxuh4s7Hw
    My pics:
    http://picasaweb.google.com/dawatsonator

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    • #3
      Re: Vermiculite cure time.

      I just poured mine yesterday morning. It was pretty well set by early evening. It's definitely hard this morning.
      GJBingham
      -----------------------------------
      Everyone makes mistakes. The trick is to make mistakes when nobody is looking.

      -

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      • #4
        Re: Vermiculite cure time.

        Well, mine took about a week to get hard, and continued getting still harder for a week after that. I think I'd recommend waiting for a week before starting the dome - its the cement component which hardens after all, and that just needs some time.

        However, I remember reading a thread recently (wish I'd read it when I was at that stage) which says you shouldn't cover the vermiculite layer like you do cement, because it already absorbs so much water while mixing.

        Hope that helps...
        Frances
        "Building a Brick oven is the most fun anyone can have by themselves." (Terry Pratchett... slightly amended)

        http://www.fornobravo.com/forum/f8/p...pics-2610.html
        http://www.fornobravo.com/forum/f9/p...nues-2991.html

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        • #5
          Re: Vermiculite cure time.

          This is a type of concrete. The portland cement in the mix will need water to cure. Keep it covered and wet for at leat a week minimum. Three weeks would be better.

          I would say you could start building the dome about 3 days after the pour.

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          • #6
            Re: Vermiculite cure time.

            Along the same lines, is it better to cure when it's warm/hot or cold out? For example, I'm in AZ and am concerned about curing "too fast" in our very hot summers.

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            • #7
              Re: Vermiculite cure time.

              I think fourty degrees F. is the magic number. Below that temperature the concrete weakens considerably. It's also hard to work with wet heavy stuff when it's cold.
              My geodesic oven project: part 1, part 2

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