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Insulation question fast - Forno Bravo Forum: The Wood-Fired Oven Community



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Dear forum users,
Thank you for your patience with the Photo galleries. We've got your galleries online!
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Insulation question fast

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  • Insulation question fast

    My dome is done and i have it wrapped with foil, i have the chicken wire but i cannot find any vermiculite or perlite in this country at all, I have gone to every plant nursery building store everywhere and nothing, not to mention i asked if there were any fire proof or temp resistant insulation materials i could use and still nothing. Does anyone one know any materials that I can use for insulation in the dome? I have all the components except the insulation and the blanket and vermiculite seem to be out of my reach here in Santiago. Can anyone give me an idea fast. I don't want to lose all my heat every time i fire the oven.

  • #2
    Re: Insulation question fast

    If you are really stuck and the oven is under cover, would mud and straw work?


    • #3
      Re: Insulation question fast

      Is cinder blocks a common building material in the Dominican? If so, check out some building suppply stores that sell blocks and bulding materials. At one time vermiculite used to be used to fill the cores of the blocks as the walls were built to provide some insulation properties.

      You might have some luck there.

      Check out my build at:


      • #4
        Re: Insulation question fast

        I assume that if you can't get insulation, you didn't insulate under the oven floor, so you may have a problem even if you can get vermiculite or refractory insulation at this point.

        Is Hispanola volcanic? There may be tufa or other lightweight rock that would work. I'm thinking that coral might do the same kind of thing.

        The DR has a huge tourism industry, hence a lot of swimming pools. Perlite or vermiculite concrete is commonly used to construct swimming pools. You might try pool suppliers.
        My geodesic oven project: part 1, part 2


        • #5
          Re: Insulation question fast

          I got some of my first perlite from pool guys.

          For what it's worth, it had portland cement mixed in with it.

          My oven progress -


          • #6
            Re: Insulation question fast

            My pool guys had both with and without portland cement and offered me the choice. I didn't know the ratio they had going of portland to vermiculite, so I just went with plain.



            • #7
              Re: Insulation question fast

              Hi, I'm a newbie on this forum, but I was having a similar problem to Mark's. Brick ovens are extremely popular here in rural Mexico, but no one uses vermiculite. I don't even know how to say it in Spanish! I've hunted all over for reasonable alternatives and found nothing here that will work.

              Anyway, the tried and true insulation for generations of brick ovens here: a mixture of 1 part tierra muerta and 1 part caca de vaca. Yes, that's one part good, ol' dirt and 1 part dried cow patties. When in Rome, right???

              I'm pretty sure you've already solved your delimma, but maybe this could be useful for another oven-builder in a country with no Home Depot.

              Hope that's somewhat helpful!
              -- Rebecca


              • #8
                Re: Insulation question fast

                I love the last post. I have no doubt that it will work if nothing else is available. I think if you search ebay for ceramic blankets, you should be able to find the firm in Portland Oregon that (I assume) can ship you the insulation best suited to your needs.
                Everyone makes mistakes. The trick is to make mistakes when nobody is looking.



                • #9
                  Re: Insulation question fast

                  Also look for Argilite...it's an expanded clay ball used in masonry insulation.

                  That's where I'd go, to a mason to see what they use for insulation from heat or the sun.

                  Good luck

                  (that second last post was a bunch of siht!)
                  sigpicTiempo para guzarlos..... ...enjoy every sandwich!


                  • #10
                    Re: Insulation question fast

                    Eta em XJ! You think you're soooooo cool hangin' in Spain while the rest of us suffer cold and wet winters! Hell! Let me tell you - I'm loving this crappy weather! I live for it! I'd never live anywhere else! Toppless women on the beach, mild winters, and great food are no reason to abandon the great old U S of A just because the weather's a bit dicey! Enjoy this sandwich baby!!! Thhhppppppphhhhhhh!!

                    Hola amigo. Que paso?
                    Everyone makes mistakes. The trick is to make mistakes when nobody is looking.