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Vermiculite or Perlite, what's the difference?

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  • Vermiculite or Perlite, what's the difference?

    I placed my order for the supplies to start my project and the masonry supplier only carries Perlite. Is that the same as vermiculite? I asked if it was silicone coated and he said no, but I am not sure if the guy would have known in the first place.

  • #2
    Re: Vermiculite or Perlite, what's the difference?

    Perlite will do the same job as vermiculite. Perlite is a "blown" rock.

    Make sure it is the coarse grained perlite. Particles should be in the order of 1/8 to 1/4 inch or so.

    I used half vermiculite / half perlite in my insulating layer.

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    • #3
      Re: Vermiculite or Perlite, what's the difference?

      Perlite works fine. It's what I used, and I didn't have any grains as big as quarter inch. It has the advantage, being white, of having a visual indication of when it's fully mixed with the portland.
      My geodesic oven project: part 1, part 2

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      • #4
        Re: Vermiculite or Perlite, what's the difference?

        I just finished working with perlite and can report that it's easy to work with and mixed well with the portland. I dry mixed the portland and perlite then added water and it mixed well. With a 5:1 perlite to portland ratio I used 8 cubic feet of perlite to about a bag of portland. Hope this helps
        My Build Thread

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        • #5
          Re: Vermiculite or Perlite, what's the difference?

          Thanks for the information

          David

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