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vermiculite mixture - Forno Bravo Forum: The Wood-Fired Oven Community



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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vermiculite mixture

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  • vermiculite mixture

    Is the 6 parts vermiculite to 1 part cement mixture based on weight or bulk? Vermiculite comes in 20 lb bags here which are quite a bit larger in bulk than the 80 lb bag of cement.

    My hearth (including an extension) measures 40 square feet. The concrete I can get from Home Depot requires nine 80 lb bags to produce 2" of depth in an area that measures 4x4' ...

    I think I will need 22-23 bags of cement (portland and refractory) to achieve the 5.5" depth recommended. How many 20 lb bags of vermiculite would you guys say I need for the insulating layer?

    And one more question ... I used "quickcrete" to pour my slab and strengthen my oven base. We mixed it by hand (arduous) and it set up very quickly. I'm thinking I should get "un-quick" concrete for the hearth so the vermiculite layer will remain wet long enough for us to mix and pour the refractory layer.

    Please give me the benefit of your collective experience and expertise.

  • #2
    i used three (i think) large bags of perlite, but don't remember the weight of the bags, and one bag of portland cement, i think. i do know i used 29 90# bags for the 3 1/2" thermal layer.
    overdo it or don't do it at all!

    My 2005 pompeii build


    • #3
      thanks ...

      that makes it sound like a 3-to-1 ratio based on bulk. how many square feet did that cover at a 2 inch depth? thanks for your help.


      • #4
        I don't have the volume (sorry), but can confirm that the ratios are based on volume, not weight. You can use a pail or bucket to count units, or for smaller amounts, you can count shovel loads.

        Pizza Ovens
        Outdoor Fireplaces


        • #5
          sorry. i guess it's not too helpful to tell you how many bags of concrete i used if i didn't indicate the size of my hearth. it is 70" x 80.5" x 5.5", with one rounded corner, reducing the volume just slightly.
          overdo it or don't do it at all!

          My 2005 pompeii build