Perlite vs Vermiculite. Use one or both?

[stevef22]

Got it, Thank you

[UtahBeehiver]

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".

[stevef22]

Thanks for clarification UtahBeehiver. Always helful.

[UtahBeehiver]

Ratios are just the opposite. See attached. Perlite or Vermiculite what ever is easier to get. David S suggests a mix of the two.,

[stevef22]

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