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Fatal insulation error---I Fear. - Forno Bravo Forum: The Wood-Fired Oven Community


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Dome Installation Video - Casa / Premio / Modena


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Fatal insulation error---I Fear.

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  • Fatal insulation error---I Fear.

    My dome/vault area is made of 4 1/2 inch firebrick, back wall also 4 1/2 inch, floor 4 1/2 inch. I applied about 3/4 inch of mortar over the vault to lock it all together.

    My concern is that I have just finished my house enclosure, 2 X 4 walls, and there is only about 4 inches between the outer oven surface and the closest 2X4 edge. I plan on filling the total area, wall cavity and 4 inch space with perlite.

    I have a thermocouple on the top, back wall, and under the floor. I am going to get a hot fire going before I do the roof and see what happens.

    Will the 2X4s burn?

  • #2
    Re: Fatal insulation error---I Fear.

    I have 2" of cerra-blanket over my dome and the hottest it's ever gotten on the outside is 100-degrees-F; but then my dome is not enclosed. You might want to consider metal studs for the roof -- I know of one oven who's wood roof burned off, now it's got a steel one. Good luck!


    • #3
      Re: Fatal insulation error---I Fear.

      The closest the 2X4 roof will get to the oven roof is 6 inches up to about 12 inches away.

      Tomorrow will be the big burn and we will see hot hot it gets.



      • #4
        Re: Fatal insulation error---I Fear.

        The ignition temperature of wood is pretty high (500F+), I do not think you will have a problem. As an example, fireplace clearances are usually 4" on the sides, and that is for exposed flame.


        • #5
          Re: Fatal insulation error---I Fear.

          Thanks Tom,

          I was hoping that I would not have to track down some insulating blanket or something. There will be quite a bit of perlite on the sides and top. I remember seeing your photo and the big amount that you needed. The space does not look that big until you start to fill it.



          • #6
            Re: Fatal insulation error---I Fear.

            I would suggest using steel 2x4s. And sheathing it with hardiplank or equivalent. That way you have no concerns. (NOTE: I don't think it is likely to be a problem but...


            • #7
              Re: Fatal insulation error---I Fear.

              I have a piece of hardibacker left over from a tile job and I think that I will put pieces of it in between the 2X4 edge and layers of perlite. I found perlite for $8.60 per 4 cu/ft so I am going to lay it on heavy.