web analytics
Vermiculite concrete under brick arch - Forno Bravo Forum: The Wood-Fired Oven Community



New Forno Bravo Forum Feature

Forno Bravo Forum Community,

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.

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.

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!

Forno Bravo
See more
See less

Vermiculite concrete under brick arch

  • Filter
  • Time
  • Show
Clear All
new posts

  • Vermiculite concrete under brick arch

    Hi everyone,
    Quick question- I have built my oven base on a thick slab and then made a 12cm slab on top of the base bricks, I would like to add a concrete vermiculite mix on top of that slab/underneath my oven floor for heat retention... here the question: will the vermiculite concrete be strong enough to hold the brick arch and floor tiles? I had a look at vermiculite yesterday and it seems very light... Do I have to put another layer of concrete on top for stability? Thanks for your help…

  • #2
    Re: Vermiculite concrete under brick arch


    I moved this to Getting Started, so you can get more input. The short answer is Yes.

    Vermiculite is pretty odd stuff (it's basically volcanic popcorn), and it does seem light and not very stable, but is will set and become solid and it has very, very good compression strength. Your oven will be solid!
    Pizza Ovens
    Outdoor Fireplaces


    • #3
      Re: Vermiculite concrete under brick arch

      Thanks James -I will give it a try this weekend.


      • #4
        Re: Vermiculite concrete under brick arch

        It dries to a cork like consistency. It will flake off at the edges, but you mostly want to keep the edges covered anyway.

        In short: Vermiculite concrete has lots of compressive strength, but almost no tensile strength. It's used for swimming pools that are under tons of pressure.
        My geodesic oven project: part 1, part 2