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Actual foundation size for a 42" oven - 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:
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Actual foundation size for a 42" oven

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  • Actual foundation size for a 42" oven

    Hi,
    I'm a newbie living in Prescott, AZ, and have started excavating the foundation for a 42" pizza oven. My question to all of you that have built ovens before me is what was the actual foundation measurements for your oven as the ebook actual has 2 different size foundations for a 42' oven. Any feedback would be appreciated.
    Barry

  • #2
    Re: Actual foundation size for a 42" oven

    I am about half done with my dome. I used the 77" by 86" size for my foundation. Hope that helps.
    Lane

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    • #3
      Re: Actual foundation size for a 42" oven

      Hi Lane,
      Thanks for the information.
      Regards,
      Barry

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      • #4
        Re: Actual foundation size for a 42" oven

        My foundation slab is 88x79. Here's what went into figuring that number: My stand is 5 blocks by 4 1/2 blocks. I wanted 4 inches of reveal on the sides and back with 6 inches of reveal in front (for us non-techies, reveal means the part of the slab that extends beyond the blocks that form the stand). The blocks are 8x16, except they are about 3/8inches less than that for mortar. I urge you to dry stack them close together, so they will be 3/8 inch shorter and narrower than 8x16, totaling about 78 by 71. Adding 10 inches to the length and 8 inches to the width gives 88x79.

        I did a 10 inch curved cantilever, so I ended up with extra room at the back, so my foundation could have been shorter, but I'm not sure it could have been a half block shorter. The primary consideration after making sure it will be big enough for the oven and the insulation you plan (a blanket will take up less space than loose insulation) is to not have to cut blocks.

        Joe
        Joe

        Member WFOAMBA Wood Fired Oven Amatueur Masons Builders America

        My thread: http://www.fornobravo.com/forum/f8/j...oven-8181.html

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        • #5
          Re: Actual foundation size for a 42" oven

          You got frost heave in Prescott. Are you planning footings or a floating slab?

          Joe
          Joe

          Member WFOAMBA Wood Fired Oven Amatueur Masons Builders America

          My thread: http://www.fornobravo.com/forum/f8/j...oven-8181.html

          Comment


          • #6
            Re: Actual foundation size for a 42" oven

            Hi Joe,
            You are correct in the frost heave in Prescott. Because of the oven location, I've had to excavate, by pick and shovel, quite a few cu yards of dirt. I was planning a slab over several inches of 3/4" rock and hope that qualifies as a floating slab. What do you think?
            Barry

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            • #7
              Re: Actual foundation size for a 42" oven

              I was planning a slab over several inches of 3/4" rock and hope that qualifies as a floating slab. What do you think?
              Six inches of crushed rock should suffice, if the area is well drained. If you are building in the lowest part of the yard that floods when it rains, then more may be required. The idea is that if there's no water, there's no frost heave.
              My geodesic oven project: part 1, part 2

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