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Outward pressure on hearth forms - Forno Bravo Forum: The Wood-Fired Oven Community

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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:
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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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Outward pressure on hearth forms

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  • Outward pressure on hearth forms

    I wanted to ask builders what they thought about the outward pressure of the concrete hearth and possibly the vermiculite layer, on the hearth forms. I know that some early verisons of the Pompeii Oven plans called for staps and/or braces to keep the hearth from buldging out, but if you are using 2"x4" studs, I am not sure the outward pressure is enough to require the extra supports.

    My concerns is that new builders are putting a lot of time that might not be necessary into supporting the hearth form.

    Any comments?
    James
    Pizza Ovens
    Outdoor Fireplaces

  • #2
    Re: Outward pressure on hearth forms

    James,

    From a professional point of view, it's probably not necessary. Still, many builders will be inexperienced, and adding the bracing is a certainty and safety issue that's probably worth the effort. My two cents.

    Jim
    "Made are tools, and born are hands"--William Blake, 1757-1827

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    • #3
      Re: Outward pressure on hearth forms

      I used 2x8, with concrete in the lower half, and perlcrete in the upper half. I nailed some little gussets in the corners just to make sure nails didn't get pulled out. I didn't notice any bowing of the forms at all.

      I did make my concrete with a minimum of water, so it pretty much stayed where I put it, and didn't try to push too hard on the forms.
      -Chris-
      I'm building a Pompeii Oven in Austin, Texas. See my progress at:
      Il Forno Fumoso

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      • #4
        Re: Outward pressure on hearth forms

        James,

        I think it would depend on many factors - the volume of the slab which generates the forces which will bend the formwork, the thickness of the formwork, and the length of the timber, would be the major ones.

        My formwork consisted of old 8" x 1" fascia & barge boards which were on hand, and as I didn't want to trip over angled bits of timber during the pour, I used some 1mm wire, threaded through the timber forms from one side to the other and tensioned, to prevent any bulge.

        Worked a treat!

        I shall explain this better with pictures in the 'Brick Oven Photos' section shortly - as soon as I can get my head around the intracacies of photobucket! Stay tuned.

        Paul.

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        • #5
          Re: Outward pressure on hearth forms

          All good points. No sense cutting a corner, and having a problem to deal with later.
          Thanks.
          James
          Pizza Ovens
          Outdoor Fireplaces

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