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Under floor paste on vermiculite? - 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.
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Under floor paste on vermiculite?

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  • Under floor paste on vermiculite?

    I just finished pouring my vermiculute insulation layer on top of the hearth. I certainly see how the compression strength will be there, but I am having a hard time understanding how to spread the under floor paste on top of the vermiculite, especially with a notched trowel. Should I put a super thin coat of cement or fire mortar on top of the vermiculite to have a solid surface to spread the floor paste? That part was not clear to be from the instructions, and I guess my search skills are not up to par because I can't seem to figure it out from the other posts here (although I am sure the answer is here!)

    Thanks!

  • #2
    Re: Under floor paste on vermiculite?

    OK, so it looks like everything but the top 1/4" is solid. Perhaps that top portion dried too quickly? I think I am just going to try to make a slury and see if I can't get that layer to 're-attach' to the overall insulating layer. It seems that when dried, it would be OK to get a layer of the fireclay mixture down...

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    • #3
      Re: Under floor paste on vermiculite?

      It's sometimes easier to lay your floor on a dry mixture of sand and fireclay, and when you get the floor the way you want it, wet it to solidify it.
      My geodesic oven project: part 1, part 2

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      • #4
        Re: Under floor paste on vermiculite?

        Originally posted by dmun View Post
        It's sometimes easier to lay your floor on a dry mixture of sand and fireclay, and when you get the floor the way you want it, wet it to solidify it.
        What is your opinion of using Heat Stop 50 fire mortar instead of fireclay? I am having a hard time finding fireclay for whatever reason.

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        • #5
          Re: Under floor paste on vermiculite?

          It's generally considered not a good idea to mortar your floor down. Some people look at this giant pile of masonry and don't realize that it is an object in motion, forever expanding and contracting with every firing. You want to sit as lightly as you can on the insulation layer.

          There's also the issue that fireclay is about ten cents per pound, as opposed to about a buck a pound for heat-stop.

          BTW I didn't use the leveling mixture. I just plunked my bricks down on the board. If you've gone with the vermiculite insulation, you can also level the floor with the sludge from cutting your dome bricks in half.
          My geodesic oven project: part 1, part 2

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          • #6
            Re: Under floor paste on vermiculite?

            I put my vermiculite concrete down, and it is level so I am about to put my fire bricks down. Should I put a layer of fire clay down on top of my vermiculite concrete and let that dry before putting down my bricks? And if so, what combination fire clay, lime, etc should I use? (I am not using a ceramic board, just vermiculite concrete)

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