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question about hearth floor - Forno Bravo Forum: The Wood-Fired Oven Community

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I'm Peter Reinhart! Ask Me Anything! Monday, February 15, 2016 7:00-8:00 pm EST

To kick off our AMA feature, we have invited author, chef and master bread maker and host of Pizza Quest, Peter Reinhart, to be our first host! Peter will be in the Forum on Monday, February 15th, from 7:00 - 8:00 pm EST. If you are unable to be online during the live session, you can post your questions in the sticky post. Peter will answer those questions during the live session on February 15th. You can view Peter's answers to your questions as well as what happened during the live session in the session thread.

Ask Me Anything New Forum Feature

You will notice a new forum at the top of the main page called, "Ask Me Anything". This forum will be used for live one hour "Ask Me Anything" (AMA) sessions hosted by people who are knowledgeable in different areas pertaining to wood fired ovens. How it works:
- Each AMA will have a "sticky" thread where the community can post questions they would like answered during the live session. This will allow everyone to participate even if you can't be online for the live session. These questions will not be answered by the host until the live AMA; if you need an answer quickly, you should post it in the appropriate Forum area for the community to respond.
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question about hearth floor

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  • question about hearth floor

    we are at stage of building hearth floor. there are 2 directions to go.

    insulated conc. mix which is 2 parts
    then the use of teh superslol

    I am confused. the directions indicate a 2 stage pour for the insulated conc. pour and a reinforced 3 1/2" pour when using the superslol. where does the superslol go? is the firebrick placed directly on this?

    we were anticipating using the ceramic fire blanker as it is readily available.

    it seems like the directions are there for the insulated concrete but then skip right over the use of the superslol and go to building the oven floor.

    help this is our intended weekend project for the holiday weekend!

    thx
    carla

  • #2
    Re: question about hearth floor

    There is a goodly amout of heat that will push down and out of the oven, through the floor. I poured a 5 inch hearth slab and placed a 2" thick piece of insulation board on this slab. On the board I then placed my firebricks, the oven floor and the soldier course. If I were doing it again I think I go even thicker on the insulation board. If I were using Perlite or Vermiculite concrete, I'd make sure to go at least what is recomended in the FB plans and if the hearth is low enough I'd go for more thickness.

    Someone here can comment on vermicrete thickness. I used the board and havn't been unhappy.

    Chris

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    • #3
      Re: question about hearth floor

      4" of vermiculite concrete, or two inches of refractory insulation board. Either or. Some people use both, and of course it's better to have too much insulation than too little, but it seems like belt and suspenders to me. I have two and a half inches of insblock19, and my slab almost never heats up.

      Don't use the blanket form of the insulation under the floor. It compresses too much to be effective there.
      My geodesic oven project: part 1, part 2

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      • #4
        Re: question about hearth floor

        thanks for all the help. now bigger question is where to get this board. its not that we dont want to purchase from site, we just live clear across the country and the shipping will kill us. doing searches online isnt getting us anywhere either.

        carla

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        • #5
          Re: question about hearth floor

          Check with James first and I'd bundle the board with the blanket to spread the cost of shipping over the two.

          Chris

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          • #6
            Re: question about hearth floor

            I dropped you another message, Wow you folks are in between everywhere but not so close to anywhere that I could be sure that you can find what you need.

            Please keep me informed, I hope I can help.

            Chris

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            • #7
              Re: question about hearth floor

              Originally posted by dmun View Post
              I have two and a half inches of insblock19, and my slab almost never heats up.
              That's interesting. I have three inches of InsBlock 19 and I agree that the hearth doesn't got hot very quickly. However, several hours into my session I would say that the underside of my hearth is definitely warm.

              I wonder how our ovens differ in this regard. I keep thinking my oven's thermal weakpoint is the floor, I frequently get the dome cleared and the entire dome maxing out my IR thermometer and the floor is still in the 600s, 700s if I clean off the coals and expose it for a while.

              Quite strange, I thought I had a lot of floor insulation.

              Website: http://keithwiley.com
              WFO Webpage: http://keithwiley.com/brickPizzaOven.shtml
              Thread: http://www.fornobravo.com/forum/f21/...ttle-7878.html

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              • #8
                Re: question about hearth floor

                Kebwi, I feel the same way about the floor being the overlooked area as far as insulation goes. I'm happy with the performance and how long the heat stays put, but it's in my nature to wonder about what if..

                Chris

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