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Hebel arch? - Forno Bravo Forum: The Wood-Fired Oven Community

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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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Hebel arch?

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  • Hebel arch?

    Hi. I have been reading about Hebel (Autoclaved Aerated Concrete) on this formum. Has anyone used it as a lintel into the oven? Cutting an arch out of this product seems easier than laying a brick arch or forming a concrete lintel.

    Will the product withstand the heat?

    Thanks
    Jase

  • #2
    Re: Hebel arch?

    I don't think anyone has tried it.

    And I'm not sure about the heat because I'm not familiar with the product.


    Dave
    My thread:
    http://www.fornobravo.com/forum/f8/d...ress-2476.html
    My costs:
    http://spreadsheets.google.com/pub?k...Xr0fvgxuh4s7Hw
    My pics:
    http://picasaweb.google.com/dawatsonator

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    • #3
      Re: Hebel arch?

      One memeber has used AAC as an under-oven insulation layer, with success. It's a good insulator, but I don't think it will stand up to direct contact with smoke or flame.
      My geodesic oven project: part 1, part 2

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      • #4
        Re: Hebel arch?

        I've used Hebel block for years as an under floor insulation, during my wood fired oven workshops, with great success.
        Although I've not used it internally I have tested it in a kiln to 1000 degrees C with little shrinkage or deteriation. At 1200 degrees C it certainly spalls and shrinks.
        If it was used as an arch I would make it thick as it certainly doesn't have great strength and be aware that being soft it you might find it wears from contact with the peel and door.

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        • #5
          Re: Hebel arch?

          Originally posted by pizzahead View Post
          Hi. I have been reading about Hebel (Autoclaved Aerated Concrete) on this formum. Has anyone used it as a lintel into the oven? Cutting an arch out of this product seems easier than laying a brick arch or forming a concrete lintel.

          Will the product withstand the heat?

          Thanks
          Jase
          I'm using it as my "under floor" insulation layer. It's quite brittle, but for your purposes, perhaps coating/rendering it with refractory cement would give it a tough outer layer?

          Comment


          • #6
            Re: Hebel arch?

            I used HEBEL to sit my oven on, its extremely brittle and cracked alot where we screwed it together. its been rendered and had no probs so far. Heat doesn't seem to bother it.
            Its very soft, you can dig away with it with your fingernail.
            Depending on the profile it has virtually no span strength and its expensive, the reinforcing material in it is no thicker than coat hanger wire, but it is very easy to work with.

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            • #7
              Re: Hebel arch?

              I used the Hebel blocks which had no reinforcing (600mm x 200mm x 100mm), and just glued them to 6mm compressed cement sheet with Hebel adhesive. No screws or nails required.
              I didn't think they were that expensive at $4 each from Bunnings.

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              • #8
                Re: Hebel arch?

                My experience is the less bonding of components in an oven the better.
                You have to work with the knowledge that the oven is constantly expanding on heating and contracting on cooling so better to allow gravity and sound architectural structures to determine how much needs to be 'stuck' together.
                The dome structure is an ideal form to allow these movements to take place and requires less bonding and bracing to hold the oven form together.

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