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  • Pompeii Foundation

    Hi,

    I have been wanting to build a pizza oven along with an outdoor grilling area and fireplace for quite some time and I finally decided to start this project as I have secured all my material for the build and will be delivered soon.. I am from Chicago so we have pretty cold winters and in my area the frost line in 42" I am in the trades so I am able to get information on pretty much everything except for concrete I just don't see those tradesman where I work too much anymore. I want to pour a pad that is 13' long and then 45 degrees 5'6" long. I would be putting rebar in this pad every 16" - 18" to give it some good reinforcement. When I build something I tend to over kill it and spend extra money and waste material but it would be a tank. My question to everyone is I was thinking of our winters and I was thinking of putting 12" sonotubes at each corner of the pizza oven 42" deep along with 4 sonotubes in each corner of the fireplace and space a few 12" tubes in between the fireplace and the pizza oven. The tubes would have rebar in them and bent over to tie into the 6" pad rebar and all poured in a monolithic pour so it's all together and the stone base would be 8" compacted gravel. I talked to a landscape contractor who does these builds for a living and he told me I was over killing it. He said 8" of stone and an 8" concrete pad would be more than sufficient and he would put his name on it. He even said the 8" pad was overkill but if I felt better to put it in go for it. He said he warranty's his builds for 5 years and he has never had a call back for anything shifting or settling. I know there has been multiple posts on this forum for foundations and base construction but I would like to open it up again in a new thread to see what anyone else has done since and if they were close to my area with similar weather. I'm looking to start in a few weeks on the pad and get my build going.
    My Build Pictures
    https://onedrive.live.com/?authkey=%...18BD00F374765D

  • #2
    I live in Utah and our winters are pretty tough too. My oven has been in over 5 years and no cracking in the slab or any frost heaving. I have about 10" of 1" minus compacted gravel with a 2x6s for a concrete slab (5.5"). There is quite a discussion about the use of sono tubes in this site so you can do a search but the main opinion was it causes more potential of slab cracking than not. I am not a concrete expert but I have not have had any structural issues with my slab. I can only recall a handful of builders who went beyond this method.
    Russell
    Google Photo Album [https://photos.google.com/share/AF1Q...JneXVXc3hVNHd3/]

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    • #3
      Beautiful!!! True craftsmanship
      My Build Pictures
      https://onedrive.live.com/?authkey=%...18BD00F374765D

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      • #4
        Thanks for the info on what your method for your slab. We put huge generators on 6" slabs out side and they never move so im with you on this but these ovens are so time consuming to build and a work of art so i just dont want to be devasted one day....im going with the 8" stone and 8" pad i think its way more than enough...i staryed my dig today for a little but to see how it is going ro go amd rivjt now the ground is soft so i almost have the oven base pad excavated
        Last edited by Chach; 03-28-2018, 05:45 PM.
        My Build Pictures
        https://onedrive.live.com/?authkey=%...18BD00F374765D

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        • #5
          Chach, I agree with Russell. The important thing with a concrete slab the size we are talking about for these ovens is that any movement be relatively equal across the area of the slab. If the oven or slab is not connected to another rigid structure, some movement can be tolerated as long as the slab has adequate reinforcement and everything moves together. The problem with the sonotubes is they provide a lot of surface area for any frost heave to act against and therefore, will induce concentrated forces into the slab at the location of each tube. For the tubes to be effective, you need to design a beam between the tubes sufficient to spread those forces from one tube to the other. Just my $.02.
          Dan

          Build Log
          Build Photo Album

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          • #6
            I appreciate the input...it was way overkill...I can't wait to pour the slab and get this project underway.

            Ricky
            My Build Pictures
            https://onedrive.live.com/?authkey=%...18BD00F374765D

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            • #7
              Not overkill, just conservatively designed I look forward to seeing your progress.
              Dan

              Build Log
              Build Photo Album

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              • #8
                Conservatively designed...I like it...your build looks like it's going well. I can't wait to start to share some of my progress
                My Build Pictures
                https://onedrive.live.com/?authkey=%...18BD00F374765D

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