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new build Q need an A - Forno Bravo Forum: The Wood-Fired Oven Community

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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!

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new build Q need an A

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  • new build Q need an A

    I have been reading for a while here and planning even longer. I have poured my slab and getting ready to start my stand. My slab is 6x6 with 24 beams and rebar. I am now getting started on my stand. My first real questions is would it hurt to put concrete in all the hollow cores of the cinder blocks or should I just fill every other one as directed in the plans. I plan on cutting out the dividers on the top row of blocks and make a beam for the hearth slab. The other concern is that I wanted to pour a 7 hearth slab 3.5 vermiculite and Portland. Is there any benefit to pour a retaining wall for the vermiculite? Is the thicker slab going to create more thermal draw? Any advice would be greatly appreciated. And I will post pic soon.
    Best Regards,

  • #2
    Re: new build Q need an A

    Welcome and congrats on your start. I filled all the cells of my block, just makes it that much stronger. As far as the top course, they make bond beam blocks which are blocks with the center recessed a couple inches for steel. If you buy those for the top course it will save some cutting. As far as the retaining wall for the vermiculite, I'm not quite sure what you mean. I poured my hearth slab with a form in the center so the finished hearth would be my form for the insulated slab. There are pictures of it on page 3 of my thread (Marks WFO). I'm sure there will be a lot more help following!

    Mark

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    • #3
      Re: new build Q need an A

      "I wanted to pour a 7” hearth slab 3.5 vermiculite and Portland."

      You need two layers. First the structural layer. A 4 in thick reinforced concrete layer should be all you need. This can be supported by the walls of your stand - you do not need additional interior beams.

      On top of this is the insulating layer. I suggest 4 inches or so of vermiculite 8:1 mixture. No stronger or you loose to much insulating value. An 8:1 mix is plenty strong enough to support your hearth and dome. No reinforcing steel.

      On top of this go your hearth bricks. These, along with the dome bricks are part of the thermal mass. This thermal mass should be, as far as possible, completely surrounded top and bottom by an insulating layer.
      Last edited by Neil2; 05-01-2009, 05:29 PM.

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