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could I use these in place of the second floor slab? - Forno Bravo Forum: The Wood-Fired Oven Community

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could I use these in place of the second floor slab?

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  • could I use these in place of the second floor slab?

    Ceramic Kiln Fire Brick K-23 IFB

    K-23 straight IFBs (Insulating Fire Brick) 9"x4.5"x2.5"

    I have heard a lot of people complain about insufficient insulation in the floor. I see these insulating firebricks for sale locally. Could I pour the normal 3" slab for the floor, then build the next layer out of these firebricks, before laying down the conducting firebricks for the oven? Skip the vermicrete / FB board and just use IFBs for that entire section?

    Is this a good deal @ $2/piece?

  • #2
    Re: could I use these in place of the second floor slab?

    you could use them, although I think you'd want to maybe lay them on edge. Check the ratings, I think IFB is less effective as an insulator than CF board, so you'll want more than 2.5".

    $2 each is a good price for IFB, but how many of them does it take to make up the same area as a sheet of CF board? That's the price comparison I'd do. Check the prices of CF board at McGill's Warehouse.
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    • #3
      Re: could I use these in place of the second floor slab?

      I looked up IFB properties and found thermal conductivity on the order of 0.3 W/mK. Forno Bravo board claims 0.13 W/mK. So yes IFB is slightly less but I think when you get below 1 W/mK it's a great insulator and you're splitting hairs to measure it out to two decimal points. Anyone have a # for 4:1 or 5:1 vermicrete?

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