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5" foundation = 3in gravel + concrete? - 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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5" foundation = 3in gravel + concrete?

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  • 5" foundation = 3in gravel + concrete?

    Hello...
    am planning out a Casa 2g 90 build, will be laying my first foundation.

    When the install guide says 5 1/2 slab, then goes on to say 3" gravel to start with plastic on top, does that mean excavate 8 1/2" do the 3" gravel, then do a full 5 1/2 slab? or is the 3" included in the 5 1/2"? I'm guessing its total 8 1/2" slab, but not clear and I dont know better, and I dont want to mess this part up!

    other questions:
    -how to estimate how much concrete is needed?
    -looking at the corner install plan they have in the manual, how much bigger does the foundation need to be?

    thanks

    Ben

  • #2
    Re: 5" foundation = 3in gravel + concrete?

    "does that mean excavate 8 1/2" do the 3" gravel, then do a full 5 1/2 slab?"

    Yes.

    Measure your slab in cubic feet. For example a 6 ft by 6ft by 5 1/2 inch slab = 16.5 cubic feet, or about .6 cubic yards.

    If you are going the pre-mix bag route, there is 0.6 cubic feet in one 80 pound bag. Therefore the slab will require 16.5/.6 = 28 bags. Get more than you need , you can always return un-opened bags.

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    • #3
      Re: 5" foundation = 3in gravel + concrete?

      thanks for that info... I started my excavation today, assuming that I needed 3" gravel then 5 1/2 in slab.


      More questions to follow, I'm sure!

      Ben

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