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Perlite vs Vermiculite. Use one or both?

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  • Perlite vs Vermiculite. Use one or both?

    Under floor and around dome. What is preferred? Ive seen people use one, or both. Does it matter?

    5:1 ratio around dome 3-5 inches
    8:1 ratio under the oven floor 4-6 inches. Correct?



    What is the difference between these?


    Thank you

  • #2
    Ratios are just the opposite. See attached. Perlite or Vermiculite what ever is easier to get. David S suggests a mix of the two., Click image for larger version

Name:	Vcrete K values.JPG
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    Russell
    Google Photo Album [https://photos.google.com/share/AF1Q...JneXVXc3hVNHd3/]

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    • #3
      Thanks for clarification UtahBeehiver. Always helful.

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      • #4
        Also, v/pcrete roughly requires twice the thickness of CaSi or ceramic blanket. IE, "minimum" floor/dome thickness of CaSi board/ ceramic blanket (dome) is 2" so you need at least 4".
        Russell
        Google Photo Album [https://photos.google.com/share/AF1Q...JneXVXc3hVNHd3/]

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        • #5
          Got it, Thank you

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