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Heat loss thru insulation board - 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.

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Heat loss thru insulation board

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  • Heat loss thru insulation board

    Does anyone have thoughts on how much heat loss is "acceptable" through the insulation board and into the hearth? I am considering a material that, according to the manufacturer's calculations, will reach about 206 degrees F on the side opposite an 1100 degree heat (assuming that heat is direct and constant). Does anyone know how FB Board compares to that? Is 1100 too high a number to use? I could have them recalculate it, but what's a realistic number (i.e., how hot does the base of the oven floor get)?
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  • #2
    Re: Heat loss thru insulation board

    What is the material? What kind of cost range are you talking about? Is it easily obtainable?
    Do not meddle in the affairs of dragons, for you are crunchy and taste
    like chicken...



    My 44" oven in progress...
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    • #3
      Re: Heat loss thru insulation board

      I don't think your floor will hit that temp.

      I could be wrong.

      But the losses you are describing seem normal and acceptable to me.
      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

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      • #4
        Re: Heat loss thru insulation board

        The material is Insblok-19, which others here have used. The numbers I quoted were based on 2" panels. With 3", the outside will reach 171 degrees @ 1100 degrees inside.
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        • #5
          Re: Heat loss thru insulation board

          Originally posted by asudavew View Post
          I don't think your floor will hit that temp.
          Reading other posts (which I should have done earlier ), it seems like 800 degrees may be more reasonable for the oven floor. At that temp, the manufacturer says the 2" board will reach 163 degrees on the outside (at 80 degrees ambient temp). That's more reasonable. Thanks for the input!
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          • #6
            Re: Heat loss thru insulation board

            Maybe one of our thermocouple users can help in this.
            In using my IR, the face temp of my hearth bricks goes off the scale (over 1050 degrees) directly under the fire, how much of that bleeds all the way through the bricks an into the insulation - I don't know. I used 4" of vermiculete as my insulation under the hearth. The highest temp I have seen through the insulation and through the support slab and 1/2" backerboard is around 125 degrees (after firing for 3-4 hrs).

            RT

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            • #7
              Re: Heat loss thru insulation board

              Originally posted by dbhansen View Post
              Reading other posts (which I should have done earlier ), it seems like 800 degrees may be more reasonable for the oven floor. At that temp, the manufacturer says the 2" board will reach 163 degrees on the outside (at 80 degrees ambient temp). That's more reasonable. Thanks for the input!
              Just giving ya a heads up.

              I think the insulation boards are the way to go, if you can afford the expense.

              Take pics of your build.
              We are all voyeurs here!

              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

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              • #8
                Re: Heat loss thru insulation board

                Dave, links to my pics are in my signature line. I have definitely decided to go with the boards; I just need to decide which ones and how thick!
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                • #9
                  Re: Heat loss thru insulation board

                  Originally posted by dbhansen View Post
                  Dave, links to my pics are in my signature line. I have definitely decided to go with the boards; I just need to decide which ones and how thick!
                  Oh!! I didn't notice the link.

                  If I had a do over.... 4 inches of board at the minimum....
                  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


                  • #10
                    Re: Heat loss thru insulation board

                    These would be great for insulating the hearth.
                    Check out the 2 lb bricks.


                    Bailey Ceramic Supply - Kilns & Acc. - Kiln Materials
                    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

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