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  • Depends on you final outer coating, if in a structure you are probably good as is. Remember there is a ton of water in pcrete and you need to really let it dry out before or if you put on a render coat.
    Russell
    Google Photo Album [https://photos.google.com/share/AF1Q...JneXVXc3hVNHd3/]

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    • Thank you Russel. So back to my original question, when the mix cures, what is the consistency supposed to be? Should it be hard, like cement, or is it crumbly?
      thanks. Just looking for a point of reference.
      John

      "Success can be defined as moving from failure to failure without loss of enthusiasm"- Churchill
      ______________
      My Build Album: https://photos.app.goo.gl/mYnNG6wjn3VAUqkK6

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      • The higher the proportion of cement in the mix, the stronger it will be, however it also reduces its insulating capacity markedly. If you are not asking this layer to insulate then you can make it stronger by simply making it richer. I find a 10:1 ratio is about as lean as is workable yet still providing sufficient strength to act as a firm substrate for rendering over. If you leave the surface too loose it sets as a rather crumbly layer. I tap the surface with the flat of the trowel when I've finished the later and this compresses it slightly as well as producing a nice flat surface that doesn't dry crumbly. Also a little powdered clay added to the mix imparts some stickiness. I also find a 50?50 mix of both perlite and vermiculite (medium grade) produces a better result than either of them alone.

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        Last edited by david s; 04-15-2021, 06:31 PM.
        Kindled with zeal and fired with passion.

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        • One other question.... once the entire dome is covered with the perlcrete/cement mix (in my case about 3 inches thick), about how long to wait before start doing the curing fires?

          Thank you all for the help.
          John

          "Success can be defined as moving from failure to failure without loss of enthusiasm"- Churchill
          ______________
          My Build Album: https://photos.app.goo.gl/mYnNG6wjn3VAUqkK6

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          • I think you can start (small) curing fires as soon as you have your insulation layers on.
            My 42" build: https://community.fornobravo.com/for...ld-new-zealand
            My oven drawings: My oven drawings - Forno Bravo Forum: The Wood-Fired Oven Community

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            • Originally posted by CapePizza View Post
              One other question.... once the entire dome is covered with the perlcrete/cement mix (in my case about 3 inches thick), about how long to wait before start doing the curing fires?

              Thank you all for the help.
              So much depends on how dry the layer has become. Weather, thickness of the layer etc. When it turns white you'll think it's dry but it won't be deeper in. If fired too aggressively the vermicrete layer can swell and crack. Try the sheet plastic over it during firing to observe any condensation on its underside, or use a garden moisture meter.
              Kindled with zeal and fired with passion.

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              • Finally finished up the percrete layer. I think starting out the first layer was a bit dry and caused application issues. Making it a bit wetter made the rest of the applications much easier. Having let it dry out for a number of days now, I'm planning on starting the curing fires today. I'm surprised how "large" the oven looks. Having a 32 inch oven, this most recent application of the perlcrete layer makes it look much larger than when it was just having the brick. Hard to imagine how large an oven in the 45" size or larger must be.
                John

                "Success can be defined as moving from failure to failure without loss of enthusiasm"- Churchill
                ______________
                My Build Album: https://photos.app.goo.gl/mYnNG6wjn3VAUqkK6

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