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Need help to continue SE MN insanity - 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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Dome Installation Video - Casa / Premio / Modena

Hello,

For many of you who bought a modular oven, you may have asked how we put the domes together when we build them. For those of you considering one of our ovens, we shot a video to make your install easier.

Check it out on our You Tube Channel.

https://www.youtube.com/watch?v=-7q7...jSniYogfUra06Q

If the link doesn't work, simply go to You Tube and type Forno Bravo Channel. The video title is How to Set your Forno Bravo Oven Dome Pieces.

Thanks for participating in our Forum. We will have more video content available soon.
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Need help to continue SE MN insanity

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  • Need help to continue SE MN insanity

    I need some positive reinforcement. I finished ( I hope) my insulating hearth, with is 2 inches of Asian FB board set onto an inch of perlcrete. The boards did, as told, absorb water from the perlcrete mixture. They were set in last Thursday...and today (Monday--5 days out) some parts of the boards are a little mushy, and I'm hesitant to start putting hundreds of pounds of bricks on them. Any advice? Wait a little longer to see if they dry out? Replace them?

    Thanks in advance,
    Eric

  • #2
    Re: Need help to continue SE MN insanity

    Eric, I would avoid tossing on the tons of weight until they dry. I did do a test and the board survived - but I would not subject my build to it. Can you lift the boards to give them a bit of air? Where you live is not your friend in respect of humidity (until it is insane cold)...
    Check out my pictures here:
    http://www.fornobravo.com/forum/f8/les-build-4207.html

    If at first you don't succeed... Skydiving isn't for you.

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    • #3
      Re: Need help to continue SE MN insanity

      Thanks Les,

      Yes, at 8 pounds a brick I'd be putting close to a ton on there, and at this point I can depress the FB boards 1/4 inch with finger pressure; so, this morning I dragged my basement dehumidifier up to the hearth enclosure and cranked it way down. Hopefully I can pull the water out of those boards by Sat AM, when I hope to set the soldiers. I can't lift them out without really destroying them, I think. They aren't soggy, just damp. We'll see, I may have to go with another plan.

      Thanks again,
      Eric

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      • #4
        Re: Need help to continue SE MN insanity

        Do the calculations as to actual loading and you will be surprised. Assuming a 36" firebrick dome and a 3000 pound load of firebrick, parging, etc, that gives you a floor loading of :

        38.25(center line of firebrick for a 36" diameter dome) * 3.1416 = 120.2 (circumference) x 4.5 (width of firebrick) =540.75 Square Inches of bearing surface, more or less.

        3000 / 540.75 = 5.54 pounds per square inch compressive weight on your substrate.

        Normal concrete has a compressive strength of around 3000 PSI and pink closed cell foam insulation is around 25 PSI so other than shrinkage issues as it dries, no worries.

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        • #5
          Re: Need help to continue SE MN insanity

          Many thanks! Your calculation is no doubt closer than my "Fermi" calculation of 10 psi. Your result is even more encouraging. The boards seem to be drying out well, but for a while there they deformed quite a bit under finger pressure. I was worried I had ruined the binder matrix around the fibers, and that the construction would sink. The dry parts of the boards are much, much stiffer. I expect the whole board to shrink a small percentage after some good firings, but this should be constant for the whole structure, and hopefully I wont get any shifts with unwanted stresses.

          Again, thanks!

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