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Floor Insulation - Forno Bravo Forum: The Wood-Fired Oven Community

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Floor Insulation

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  • Floor Insulation

    Hi all just have a quick question, I have been searching the forum about floor insulation and can't find the answer. Can I put the soldier bricks directly on top of vermiculite concrete,I am concerned that it will not support the weight of the oven

  • #2
    Re: Floor Insulation

    G'day
    Yes there is no problem with the insulation layer supporting the oven whether its pearlite cement or ceramic board. I know you can dint the surface of both with a fingernail but the weight is spread out so its supported. All the ovens here are built directly on the insulation
    Regards dave
    Measure twice
    Cut once
    Fit in position with largest hammer

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    http://www.fornobravo.com/forum/f51/...ild-14444.html
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    • #3
      Re: Floor Insulation

      Tarter3,
      Dave is right about that. I just want to elaborate on vcrete strengths. A 5 to 1 (vermiculite to portland cement) is what is recomended for the floor. Vcrete over the dome is usually about 10 to 1. You probably have picked that up already. I just wanted to be sure .
      I don't care what folks say behind my back........They are either braggin' or.......lyin'


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      • #4
        Re: Floor Insulation

        just a recommendation: use some FB Board or equivalent for the actual base under the floor bricks. I think the gain in efficiency and heat retention is easily justified.

        Texman
        My Progress:
        http://www.fornobravo.com/forum/f8/t...ild-17324.html

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        • #5
          Re: Floor Insulation

          I used both vermiculite (bottom 3.5") and 2" calcium silicate board on top. After a number of 800-900F pizza sessions the bottom of the support slab remains at ambient temp.
          Attached Files

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          • #6
            Re: Floor Insulation

            When you look at the vermiculite slab you think there is no way that it will support the dome but it does and is surprisingly strong.

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            • #7
              Re: Floor Insulation

              Originally posted by GianniFocaccia View Post
              I used both vermiculite (bottom 3.5") and 2" calcium silicate board on top. After a number of 800-900F pizza sessions the bottom of the support slab remains at ambient temp.
              Question...are you finding the floor too hot?
              Old World Stone & Garden

              Current WFO build - Dry Stone Base & Gothic Vault

              When we build, let us think that we build for ever.
              John Ruskin

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              • #8
                Re: Floor Insulation

                Originally posted by stonecutter View Post
                Question...are you finding the floor too hot?
                is the floor soap stone?

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                • #9
                  Re: Floor Insulation

                  Question...are you finding the floor too hot?
                  Initially, when I relied on only dome-reflected flames to heat the floor I could only get 400-500F in the center of the floor, making for some pretty doughy pizzas. Now, charging the floor with coals for several minutes, I have been able to get both dome and floor 800F.

                  The last few sessions this has worked well for my neopolitan pies using Caputo 00 and sourdough starter.
                  Attached Files

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                  • #10
                    Re: Floor Insulation

                    G'day
                    You got to be happy with results like that... Good look' pie
                    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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                    • #11
                      Re: Floor Insulation

                      Gunna have to work on my dough. I can't get cornicione like that. I get a puffed up crust around the outside, but not that good.
                      I'm thinking a bit wetter (I'm at 60-62%), and a little less handling.
                      Also our shops finally have typo 00 at reasonable prices.

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                      • #12
                        Re: Floor Insulation

                        Since you all are on the subject of hearth insulation...If I poured a concrete slab, then set a 2" insulation board, then the hearth bricks, would that work well enough, or is a pour of vermiculite preferred under the insul board? I'm still in my planning stages and wondered about that. I know which way works best, just wondered about the effectiveness of just the insul board under the hearth bricks. Or, could I just beef up the insul board to a double layer, perhaps? Pros and cons?
                        My Build:
                        http://www.fornobravo.com/forum/f8/s...ina-20363.html

                        Ok. It was me. I let the dogs out.

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                        • #13
                          Re: Floor Insulation

                          The cal sil board is about twice as good an insulator as vermicrete, but costs more than double vermicrete.
                          50 mm of it is sufficient IMO, but if you want more it wouldn't hurt.
                          The cal sil is dry when you place it while vermicrete is wet and the water needs to be removed for it to work. Covering wet vermicrete with calsil will trap the water in and it will take a long time to remove it.
                          Last edited by david s; 02-13-2014, 02:37 PM.
                          Kindled with zeal and fired with passion.

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                          • #14
                            Re: Floor Insulation

                            Originally posted by david s View Post
                            The cal sil board is about twice as good an insulator as vermicrete, but costs more than double vermicrete.
                            50 mm of it is sufficient IMO, but if you want more it wouldn't hurt.
                            The cal sil is dry when you place it while vermicrete is wet and the water needs to be removed for it to work. Covering wet vermicrete with calsil will trap the water in and it will take a long time to remove it.
                            Thanks. That helps. During normal conditions, how long would be best to let the vermicrete dry before covering it, if I went that route?
                            My Build:
                            http://www.fornobravo.com/forum/f8/s...ina-20363.html

                            Ok. It was me. I let the dogs out.

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                            • #15
                              Re: Floor Insulation

                              Originally posted by NCMan View Post
                              Thanks. That helps. During normal conditions, how long would be best to let the vermicrete dry before covering it, if I went that route?
                              I did some test on this and documented the results. The test was done in ideal drying conditions. Hope this helps.
                              Attached Files
                              Kindled with zeal and fired with passion.

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