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Vemiculite Pad - 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.

Ask Me Anything New Forum Feature

You will notice a new forum at the top of the main page called, "Ask Me Anything". This forum will be used for live one hour "Ask Me Anything" (AMA) sessions hosted by people who are knowledgeable in different areas pertaining to wood fired ovens. How it works:
- Each AMA will have a "sticky" thread where the community can post questions they would like answered during the live session. This will allow everyone to participate even if you can't be online for the live session. These questions will not be answered by the host until the live AMA; if you need an answer quickly, you should post it in the appropriate Forum area for the community to respond.
- Another thread will be posted for the live AMA. Registered users who are logged in during the live session can interact with the host by asking questions and receiving responses.
- The live thread will remain in the AMA forum to view after the session.

We hope you enjoy this new feature! Please let us know if there is a topic that you'd like to have as an AMA and we'll look for a host!

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Vemiculite Pad

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  • Vemiculite Pad

    I just poured a 3" pad yesterdayon top of 7" of structural concrete, perfectly level but.. as the pad dried some loose vermiculite kind of floated to the top & now I have some voids on the surface. they're around theedges of the pad & dont matter structurally but I worry about some hot spots when I lay the floor. Should I patch themwith more verniculite concrete, they're about 1/4" deep? Should I skim a veneer of refrax mortar over the top to make it flat again? Or should I just forget about it

  • #2
    Re: Vemiculite Pad

    Balty,

    Personally, I'd skim coat it with refrax. The major reason is to have a really flat, level surface on which to lay your floor. It's the small problems like this one that add up as you go. Take the time to repair it now; it'll save time down the road.

    Jim
    "Made are tools, and born are hands"--William Blake, 1757-1827

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    • #3
      Re: Vemiculite Pad

      One thought would be if you put together a bed of knotched trowel coated sand and fireclay paste thick enough, you could still lay the floor level. That way you would not have to add a layer of set mortar or concrete, but rather use the sand/fireplace to level out the surface.

      What do you think? Jim?

      James
      Last edited by james; 04-25-2007, 01:10 PM.
      Pizza Ovens
      Outdoor Fireplaces

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      • #4
        Re: Vemiculite Pad

        James,

        Sure, that would work, too. I was mainly thinking of ease and speed. If he has Refrax available, it would be a simple matter to mix up a farily sloppy batch and use that. The whole exercise is about making a flat, solid base on which to lay the floor. Other than that, I don't think the materials matter all that much, so long as the mix is refractory.

        Jim
        "Made are tools, and born are hands"--William Blake, 1757-1827

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        • #5
          Re: Vemiculite Pad

          Thanks Guys It'll be a couple of weeks before I get to it. I travel a lot & limited to weekends for the project. I need to get refrax to assemble the oven anyway but I like the sand/fireclay mix. What is the correct mix?

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          • #6
            Re: Vemiculite Pad

            Hi. I used 1:1 Sand/Fireclay mix per the original plans. I would think it would have leveled your situation out, not certain.
            - JC

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            • #7
              Re: Vemiculite Pad

              I just down loaded the Pompei plans, wish I'd done it a week ago. I'm a little worried about my insulated pad, now 1 week old.
              First I used a mixer rather than mixing by hand, although I was careful not to over mix, I read that may reduce the themal properties. Secondly it is only 3" thick.

              I was thinking of increasing the thickness by laying an Island of split firebrick surrounded by some more vermiculite concrete. (as on p 22) The oven floor is going to be a little high as it is (approx) 46" this would raise it to 48"

              I like the idea of some more thermal mass in the floor but what do you guys think? Will the island add a little to the isulating properies of the 3" pad underneath or will it actually do the opposite?

              Hate soggy bottoms

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              • #8
                Re: Vemiculite Pad

                Big weekend for me. I solved my insulation issue by adding another 3 " of vermiculite concrete. I inset a sub floor with split fire brick then skimmed over with a veneer of high temp mortar before laying the floor. I found that the bricks were neither straight, square or dimensionally similar & ended up shaving 1/4 " of the dimension to get the floor to fit with minimal gaps. Over 500 cuts on the saw, which I also discovered is not square either. I'll lay a bed of sand/fireclay under the floor & sand it flat next weekend.

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                • #9
                  Re: Vemiculite Pad

                  Hard work but well worth it. It looks great.
                  James
                  Pizza Ovens
                  Outdoor Fireplaces

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