Perlite to concrete ratio?

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  • KEmerson
    Apprentice
    • Jan 2009
    • 204
    #1

    Perlite to concrete ratio?

    Hello all,
    Can anyone tell me what the ratio of perlite to concrete is for a hearth? I did mine a few years ago and simply can't remember. I know it's more perlite/ less concrete. 8:1? 5:1? Ok, I'm stabbing in the dark.
    Thanks
    Kim
    Tags: None
    • stonecutter
      Il Pizzaiolo
      • Jun 2007
      • 2003
      #2
      Re: Perlite to concrete ratio?

      5:1 - 8:1 is a good range. More Portland = lower insulating properties.
      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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        • KEmerson
          Apprentice
          • Jan 2009
          • 204
          #3
          Re: Perlite to concrete ratio?

          Thanks. I was working from memory and the big take from this is knowing that there's still some memory to work from.
          Kim

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