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  • Oven floor insulation

    I'm building a 42" Pompeii and I'm using vermiculite as my oven floor insulation. Should I build the dome on top of the insulation or the concrete base? The vermiculite seems a little too fragile to support the dome. TIA

  • #2
    Originally posted by kcwagner17 View Post
    I'm building a 42" Pompeii and I'm using vermiculite as my oven floor insulation. Should I build the dome on top of the insulation or the concrete base? The vermiculite seems a little too fragile to support the dome. TIA
    Do a search on the forum for "vermicrete" - it's a mix of concrete and vermiculite for the floor insulation layer
    My build progress
    My WFO Journal on Facebook
    My dome spreadsheet calculator

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    • #3
      Welcome KC! Many of us have used either vermiculite or perlite (or a 50/50 mix) with cement in a 5:1 ratio for the base insulation layer. You must have an insulation layer between your top concrete slab (the hearth) and your oven otherwise the concrete will actually act as a heat sink and getting your oven up to temp will be difficult & costly (if even possible). I used 5:1 (perlite:cement) under my oven and it's worked well for me since 2009. Be aware that you will want a minimum of 4"-5" of the insulating cement under your oven. The CaSi insulating board is expensive, but well worth it in terms of time & effort. Also the CaSi is a better insulator...only 2" needed to provide adequate base insulation.

      Doing your dome insulation, you also have the option of using a ceramic batting or the perlcrete or vermicrete mix. If you use the insulating cement mix over the dome, it is done with a 10:1 mix ratio. david s is our casting expert and he has noted that if you choose to make the perlcrete or vermicrete, throwing in a handful of clay powder with each batch makes it easier to mix. We also have many successful builds on this site that build a "dog house" around their oven and simply pour in loose perlite or vermiculite to cover and insulate the dome.

      Didn't mean to rattle on here, but I thought this info might be helpful for you...Good Luck and spend time looking at the builds on this site. A good place to start is the thread I've linked below for you.

      https://community.fornobravo.com/for...n-the-archives
      Mike Stansbury - The Traveling Loafer
      Roseburg, Oregon

      FB Forum: The Dragonfly Den build thread
      Available only if you're logged in = FB Photo Albums-Select media tab on profile
      Blog: http://thetravelingloafer.blogspot.com/

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      • #4
        Thanks for the information! So much good stuff to digest. I did a 5:1 vermicrete insulation base but it didn't seem strong enough to support the dome. It's been 5 days of curing and I'm starting to feel more confident that it will hold.

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