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Floor insulation question - Forno Bravo Forum: The Wood-Fired Oven Community

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  • Floor insulation question

    Bummer,
    I think the fiberboard I got for my build is the wrong material. It is compressible and not very rigid. I am curious if Insulating Fire Brick, "IFB", can be used for floor insulation? Seems I saw something about using it under the floor is OK. But can't find it now. Any opinions or thoughts about using IFB for that purpose. I can get them for $28.50 per case of 10.

  • #2
    Re: Floor insulation question

    Vermicrete has the same insulation properties as IFB, only cheaper. You'll need twice the depth of vermicrete/IFB as fiber-board to get the same insulation value. Get the proper board if you can. Try Harbison Walker (anhrefractories.com) in Dallas. A number of builders have used their Insboard 19.

    Dallas, TX 214-330-9243 214-330-6085 Renee Fouts
    4585 Mint Way Willie Edwards
    Dallas, TX 75236 Joe Lloyd

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    • #3
      Re: Floor insulation question

      Thanks Gianni, I'll give them a call first thing in am. I have been to their web site and did not get much info out of it.

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      • #4
        Re: Floor insulation question

        Harbison Walker did not work out, their minimum order is over $600. Ill keep looking.

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        • #5
          Re: Floor insulation question

          I purchased FB board from our host and had it shipped to Texas. Tscarborough in Austin may have a source, check with him.
          Good luck, finding the right material is one of the challenges of building the WFO correctly. Take your time and get the right stuff.
          Tracy
          My Progress:
          http://www.fornobravo.com/forum/f8/t...ild-17324.html

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          • #6
            Re: Floor insulation question

            Mucho Thanks to Texman!
            After a couple of person to person e-mails, I believe I do have the right insulation after all. Gave me a scare though.
            All the help available on this site is unbelievable. As soon as I mortar the first two brick together it will be my first two ever!

            Thanks to all and especially Texman!

            moT

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            • #7
              Re: Floor insulation question

              Originally posted by GianniFocaccia View Post
              Vermicrete has the same insulation properties as IFB, only cheaper. You'll need twice the depth of vermicrete/IFB as fiber-board to get the same insulation value.
              So vermicrete really has half the insulating properties...
              The English language was invented by people who couldnt spell.

              My Build.

              Books.

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              • #8
                Re: Floor insulation question

                It depends on how much cement it contains. The higher the cement content the higher the conductivity /lower the insulation value.
                Kindled with zeal and fired with passion.

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                • #9
                  Re: Floor insulation question

                  I updated the results of my vermicrete slab drying experiment which shows a water loss of some 75% over a four week period in uncovered, ideal drying conditions. Make of it what you will.
                  Attached Files
                  Kindled with zeal and fired with passion.

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                  • #10
                    Re: Floor insulation question

                    Originally posted by brickie in oz View Post
                    So vermicrete really has half the insulating properties...
                    ceramic blanket K value (thermal conductivity) around 0.04 (av. between #6 and #8)
                    Vermicrete 4:1 K value 0.16
                    6:1 0.12
                    8:1 0.09
                    Vermiculite alone 0.06
                    Perlite alone 0.03
                    So yes blanket is about twice as good as 10:1 vermicrete, although the values change a bit with increased temp.
                    Also note that perlite is a superior insulator on its own, although combined with cement expect the values to be much the same as vermicrete.

                    Sorry the table was nice and neat until I hit the submit button and it's jumbled it up.
                    Last edited by david s; 09-28-2012, 10:05 PM.
                    Kindled with zeal and fired with passion.

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