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

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Oven Insulation

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  • Oven Insulation

    I just completed insulating my oven, but I'm so sure I did it correctly. I mixed 10 parts of vermiculite to 1 part portland cement and 3 parts of water. I also place three layers of heavy duty aluminum foil over the bricks and then proceeded to put wire mesh over the foil then the insulation. From what I see of some of the mixture that fell on the ground and dryed it's very loose and I'm afraid when I take the forms away it will crumble. did I do it right? will it crumble should I stucco it? Help!

  • #2
    Re: Oven Insulation

    It should harden up sufficiently for you to stucco over it.
    Kindled with zeal and fired with passion.

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    • #3
      Re: Oven Insulation

      hi David,
      how long do I need to wait before I can remove the forms around it

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      • #4
        Re: Oven Insulation

        I don't use forms, but rather just press the mixture in place and tap the outer surface with the flat of a trowel. If you've used formwork I hope you oiled the face of the forms, otherwise I think it will stick. 24 Hrs should be sufficient for it to harden enough. Making the mixture stronger by adding more cement is a mistake in that you reduce the insulation efficiency. You want it just strong enough to stand up on its own and be firm enough to take the stucco coat. A 10:1 mix seems about right.
        Kindled with zeal and fired with passion.

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        • #5
          Re: Oven Insulation

          Thanks David for the quick response. I didn't oil the form.
          I built a barrel type oven. I may use stucco or I might just
          Brick the walls and put a roof over it

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