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Vermiculite or Perlite, what's the difference? - Forno Bravo Forum: The Wood-Fired Oven Community


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Dome Installation Video - Casa / Premio / Modena


For many of you who bought a modular oven, you may have asked how we put the domes together when we build them. For those of you considering one of our ovens, we shot a video to make your install easier.

Check it out on our You Tube Channel.


If the link doesn't work, simply go to You Tube and type Forno Bravo Channel. The video title is How to Set your Forno Bravo Oven Dome Pieces.

Thanks for participating in our Forum. We will have more video content available soon.
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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.


    • #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


      • #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


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

          Thanks for the information