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Vermicrete very crumbly after setting - 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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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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Vermicrete very crumbly after setting

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  • Vermicrete very crumbly after setting

    Hi, I've mentioned this in another thread but felt like its a subject deserving its own.
    I mixed the vermicrete for my hearth insulation using 6:1 mix with slightly over 23litres water to 100L of mix because I have a document from my supplier with these instructions saved in my email from a year or 2 ago. Anyway, the mix was VERY dry. It has dried out very crumbly. It shouldn't be a problem because its in a concrete/block box like structure so it can't go anywhere. My oven is now sitting on top and I'm ready to insulate it.
    Anyway, I now find this document (attached)on my suppliers website that recommends I use 40/50% water in the mix. I know this is contrary to all the advice here but from my personal experience mixing this stuff I'm pretty sure it needs to be much wetter than the original 23% water mix or it'll never hold on the dome structure. Has anyone had similar experience? Could my suppliers vermiculite be different from others?

    Thanks

    Richard
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  • #2
    Re: Vermicrete very crumbly after setting

    Originally posted by RichC View Post
    Could my suppliers vermiculite be different from others?
    I doubt it, vermiculite is vermiculite.

    Vermiculite - Wikipedia, the free encyclopedia
    The English language was invented by people who couldnt spell.

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    • #3
      Re: Vermicrete very crumbly after setting

      I think every batch of vermiculite varies a little, but I've found 30 L water to every 100 L vermiculite to be the ideal ratio. If the stuf has got wet then less is required or if using a fine grade more is required. If you end up with water in the bottom of your barrow or bucket then you've added too much water. I've mixed tons if this stuff and the water addition is important to get right.
      23 L water for 100 l verm. Is not enough OMO.
      Last edited by david s; 09-07-2013, 07:08 AM.
      Kindled with zeal and fired with passion.

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