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First time builder - lintels for hearth? - 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.
- 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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First time builder - lintels for hearth?

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  • First time builder - lintels for hearth?

    I'm just starting project for modular pizza oven. Have laid 8" thick reinforced foundation onto which I'll build concrete block base. My questions are to do with materials for hearth. I have concept of using concrete lintels 100mm X 65mm (4" X 2.5") laid between the concrete blocks then topped with 12.5mm Hardibacker board, then either making insulating layer of vericrete & CALSIL board or just CALSIL board without Vermicrete. I figure maybe I'll need 4 lintels to bridge the 1.2M square gap adequately. Does anyone have any experience of doing this rather than pouring concrete hearth? Are there any risks or potential poor performance with oven? Cooking surface will be firebricks.

    Also thinking if I can use 140mm wide hollow dense concrete blocks rather than normal 215mm wide as they should be lighter to handle, with every other hollow filled with concrete - is this likely to be stable enough?

    Thanks in advance for advice - don't want to screw up through trying something new.....

  • #2
    Re: First time builder - lintels for hearth?

    Hi, I had the same idea to use lintels. after giving it lots of thought I believe it would work just fine. definitely put the concrete board on top of that and you should be good to go. the heat will never reach the lintels and so what if it does a little???? you will have the concrete board, FB Board and firebrick on top of them so it should never be a problem. I ended up not using lintels since I strained my wrist digging the foundation by hand and found that the lintels that long are heavy. my two cents is that it should work.


    • #3
      Re: First time builder - lintels for hearth?

      I think Rob posted the same question on three forums at the same time. It was answered here
      My build progress
      My WFO Journal on Facebook
      My dome spreadsheet calculator


      • #4
        Re: First time builder - lintels for hearth?

        Hi Dagored- I posted in several places as I couldn't really decide where the best place was to get some responses. From the replies it looks like newbies was the best. Thanks for your answer - it differs from most others who think that the only safe way is to pour solid concrete hearth - I still think the lintels would be strong enough and a darn sight easier but we're in the minority. For my first build I may finish up playing safe and pouring concrete.

        I will post again when I decide and advise on the results.