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Hearth insulation. Vermiculite v pumice - 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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Hearth insulation. Vermiculite v pumice

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  • Hearth insulation. Vermiculite v pumice

    Hi there everyone, I have just found out about this site and have now decided to change my plans for a pizza oven to on of these ones. I have already built the base so now have to look at extra insulation in the hearth. In New Zealand fire bricks and vermiculite are pretty expensive $7 - $8 per brick and $10 for 5 litres of vermiculite. Has any one ever used pumice and concrete in the hearth instead of vermiculite? Would the thermal value be reduced too much?
    Look forward hearing your thoughts.


  • #2
    Re: Hearth insulation. Vermiculite v pumice

    Pumice works, the ancient romans used it, it's way better than some of the workarounds like sand or broken glass. You may need more than the four inches you need for vermiculite or perlite.

    8 dollars for a one dollar firebrick? What are they doing, shipping them by parcel post?
    My geodesic oven project: part 1, part 2


    • #3
      Re: Hearth insulation. Vermiculite v pumice

      Check for perlite. It does as well as vermiculite.


      • #4
        Re: Hearth insulation. Vermiculite v pumice

        Hi Kris

        I am from New Zealand and also in the process of building an oven. I managed to pick up 100 litre bags a vermiculite from a garden supply off the internet for around $60.00 - do a search and find the cheapest. Also using fire bricks from placemakers for around $6 each after getting a discount for bulk purchase. Unfortunately we do seem to be paying way too much for bricks in New Zealand compared to others on this site.