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Pre-made foundation? - Forno Bravo Forum: The Wood-Fired Oven Community

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I'm Peter Reinhart! Ask Me Anything! Monday, February 15, 2016 7:00-8:00 pm EST

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.

Ask Me Anything New Forum Feature

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.

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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Pre-made foundation?

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  • Pre-made foundation?

    So I have just been given 2 concrete slabs in excellent condition. One is 6'x5'x4" & the other is 6'x2'x10".
    Looking at the plans, if I put the 2 together it will be just a few inches smaller than what the plan calls for, but large enough to build the 42" oven on top of.
    My plan is to dig out the hole & pack sand into it until the slabs are both level & even with the ground. I realize there is a difference in width between the 2, but it shouldnt be too hard to match them.
    Any major problems with doing it this way as opposed to pouring a foundation?
    S.

  • #2
    Re: Pre-made foundation?

    I have no personal experience with this type of foundation, but I would worry about the Canadian frost heaving them in different ways, or if they were to settle at different rates, leading to an uneven foundation. Can you join them together somehow, maybe with rebar drilled into both sides? Do they have rebar in them already (i.e., are you sure they're strong enough)? At a minimum, you might want to put a thick layer of gravel under the sand and a layer of rigid insulation under the whole thing to help minimize the heaving. Here are a few related links:


    Ground Freezing and Frost Heaving - Canadian Bldg Digest

    Thread
    Shallow foundations
    Last edited by dbhansen; 05-23-2008, 09:44 AM.
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    Oven-building thread

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    • #3
      Re: Pre-made foundation?

      I wouldn't use sand, that will hold moisture. A bed of washed stone (3/4"+ size, a couple feet deep) with drains in the bottom running to daylight (if you have a slope) or a dry well would be a safer bet. If there's no water underneath, it can't freeze.

      A horizontal layer of rigid foam insulation around the slab (buried a few inches deep) would be good too.

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      • #4
        Re: Pre-made foundation?

        I think a layer of stone, covered with plastic, then sand to level is the way forward.
        I could also drill a pile or two down to fill with concrete
        Thanks for those links!
        S.

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