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Fibre board hearth insulation. - Forno Bravo Forum: The Wood-Fired Oven Community

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  • Fibre board hearth insulation.

    I'm building my oven with stuff I have laying around (budget non-existent)
    and I happen to have 3 insulating fibre boards laying around.

    I have two of these: Promatect H that has 0.21 W/mK at 200?C and is 25mm thick.
    (http://www.promat-ap.com/pdf/HTI_TE38_500.pdf)

    the other is Promafour that 0.185 W/mK at 200?C 20 mms thick.
    (http://www.promat-hti.be/files/cms1/...OUR%20(EN).pdf)

    I'm building a low dome Neapolitan oven and plan on running it mighty hot. (and both brand claim to be "shape and dimensionally stable up to 400 ?C")

    I guess my question is threefold:
    1. Are these the right boards for insulating my floor?
    2. Which one?
    3. Since I have 'em and I'll probably get rid of the ones I don't use, is there an advantage to be had by using two of them stacked together?


    Any help is greatly appreciated!

  • #2
    Re: Fibre board hearth insulation.

    Gray Crusty
    This is a hard one to answer as probably no one has used this insulation before.
    I can't say myself but if I was considering this insulation would it take the weight of the oven firstly.
    Secound could it take the heat that an oven can produce , which is about 500C so your best to have something that should handle 650C.
    If it can take the weight great. If it is a bit low on the temperature side and funds are tight you could use it as a secondary insulation layer protected by a higher rated insulation layer. From what I read its rated at 400C which is a little low.
    Sorry for being carful with my answer as its pretty hard to replace after your oven is finished.
    Regards dave
    Measure twice
    Cut once
    Fit in position with largest hammer

    My Build
    http://www.fornobravo.com/forum/f51/...ild-14444.html
    My Door
    http://www.fornobravo.com/forum/f28/...ock-17190.html

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    • #3
      Re: Fibre board hearth insulation.

      Thanks for the answer.
      I'm prettty sure they can take the weight, they are hard, heavy and lay flat on a concrete slab so where are they gonna go? And both are calcium silicum boards, which a lot of people on here are using.
      Anyway, I already layed down the thicker one and cut it to shape, I'll see if I can find something else to put on top of it free or cheap, otherwise I'm using the second board I guess.

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      • #4
        Re: Fibre board hearth insulation.

        G'day
        Use the other board as well you can't have to much insulation. If you can get pearlite or vermiculite mixed with Portland cement 5 to by volume. A couple of ins should protect things. You can usually find this as a soil conditioner and as a hydropics medium.
        Regards Dave
        Measure twice
        Cut once
        Fit in position with largest hammer

        My Build
        http://www.fornobravo.com/forum/f51/...ild-14444.html
        My Door
        http://www.fornobravo.com/forum/f28/...ock-17190.html

        Comment


        • #5
          Re: Fibre board hearth insulation.

          Thanks, instead of that I used blocks of Ytong of 7 cms thick on top of the concrete and under the boards, they cost next to nothing. Should do the trick.

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