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Problem with Hearth - 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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We hope you enjoy this new feature! Please let us know if there is a topic that you'd like to have as an AMA and we'll look for a host!

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Problem with Hearth

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  • Problem with Hearth

    Contractor poured concrete yesterday while i was out. Bad move!! He poured it 4.5 inches deep leaving only 3" for insulated layer. Now, i need to make a decision to either raise form an inch making entire hearth a full inch thicker or pour the remaining 3" of the insulated layer and then purchase some Cal Sil board and lay it on top to make sure there is enough insulation under the floor of the oven.
    Any comments? or suggestions which would be preferred?
    Thanks,
    Jim Bob

  • #2
    Re: Problem with Hearth

    Three inches and the Cal Sil board is the way to go if you can afford that option.

    Otherwise raise it an inch or two.
    My thread:
    http://www.fornobravo.com/forum/f8/d...ress-2476.html
    My costs:
    http://spreadsheets.google.com/pub?k...Xr0fvgxuh4s7Hw
    My pics:
    http://picasaweb.google.com/dawatsonator

    Comment


    • #3
      Re: Problem with Hearth

      Thanks. Not sure i can find the Cal sil board in Memphis and i have no idea how expensive it is. Sounds like from you it is very costly. Have an idea of price range?
      Jim Bob

      Comment


      • #4
        Re: Problem with Hearth

        I'm not sure because I didn't use it.
        But I think it's in the $150 - $200 range.
        My thread:
        http://www.fornobravo.com/forum/f8/d...ress-2476.html
        My costs:
        http://spreadsheets.google.com/pub?k...Xr0fvgxuh4s7Hw
        My pics:
        http://picasaweb.google.com/dawatsonator

        Comment


        • #5
          Re: Problem with Hearth

          Cal-sil (and insblock19) boards come in one inch thickness. You could use one inch of refractory board on top of two inches of vermiculite concrete to get your three inches and required insulation. Cal-sil has the Memphis is a big place: they are sure to have a refractory supplier. Consult maps.google.com
          My geodesic oven project: part 1, part 2

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          • #6
            Re: Problem with Hearth

            i finally gave up trying to locate Calsil board. First it was too expensive and second the minimum purchases were ridiculous for my needs.
            So, i found some very thin and flexible masonite and cut long strips 4" wide and stapled them to the inside of form and now the full 4" of vermiculite/cement mix can be poured.
            As always though, i appreciate the quick, informed responses that i receive on this forum. Will try posting some of pics soon.
            Jim Bob

            Comment


            • #7
              Re: Problem with Hearth

              Good deal Jim.

              That's probably what I would have done.

              Dave
              My thread:
              http://www.fornobravo.com/forum/f8/d...ress-2476.html
              My costs:
              http://spreadsheets.google.com/pub?k...Xr0fvgxuh4s7Hw
              My pics:
              http://picasaweb.google.com/dawatsonator

              Comment


              • #8
                Re: Problem with Hearth

                Well, the hearth is completed now with a full 4" of insulated concrete on top of the 4.5" of regular concrete. Yea, i know the contractor poured it too thick, but it's done now and looks okay. One thing I did do was use a product called Poolkrete. It is 5 parts vermiculite and 1 part cement- just right. except the vermiculite looked like a pretty fine grade. Not sure how well it will insulate. But it is very inexpensive($10/2 cu ft bag). It is made by Strong Mfr in Pine Bluff, AR. they also make a straight vermiculite which i have ordered for the loose material on top of the oven. It is very reasonbly priced too. ($12 per 4 cu ft, plus freight). Of course i ordered it thru my friend who owns a pool company.
                Anyway, now ready to lay the floor of the oven after i drill holes in the hearth for the temperature probes.
                Getting excited now,

                Jim Bob

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