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Hearth Floor Questions (More) - 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.
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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!

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Hearth Floor Questions (More)

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  • Hearth Floor Questions (More)

    Sorry, I know some of these are a bit redundant, but I am new and have a small brain. I plan on using 2x8's to make a form for my hearth.

    1. If I put down 3.5" of concrete with rebar is that good enough for strength? (54"x54" square with a span of 42")

    2. If I fill the rest of the form up with vermiculete, is that enough insulation?

    3. Then I put my fire brick for the floor of the oven on top of the hearth. Can I use splits and lay them "flat" or do I need to lay them on edge to get enough mass for the floor?



  • #2
    Re: Hearth Floor Questions (More)

    2x8" are 7.5" wide. Assuming your frame overlaps the support wall by, say, two inches, you're look at 5.5" total fillable height. If you fill 3.5" of concrete that's only 2" of vermicrete. Vermicrete is a decent insulator at high thicknesses but it isn't all that great. It isn't like the fancy ceramic insulating materials. I doubt if 2" of vermicrete is much good at all frankly. I would recommend a minimum of 4" of rebar concrete (that's about what I did) and at least another four inches of vermicrete if you aren't planning on using any other form of floor insulation, more would be better.

    Splits are not thick enough for an oven floor. Double them up to get normal face-up firebrick thickness, which is how most of us lay our floor. You could get three splits high if you wanted a little more thermal mass on the floor.

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