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how many 80 pound bags? - 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.
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how many 80 pound bags?

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  • how many 80 pound bags?

    any help appreciated.have 10 --80 pound bags premix concrete.will it be enough for a 7 foot by 6 foot by 3.5 inches thick insulating hearth slab?thanx.

  • #2
    Re: how many 80 pound bags?

    You need around 14 cu ft of concrete. Most bags of concrete are 2/3 ft. Looks to me that you would need 21 bags.

    Les...
    Check out my pictures here:
    http://www.fornobravo.com/forum/f8/les-build-4207.html

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    • #3
      Re: how many 80 pound bags?

      Yeah you need more.

      I calculated 19 bags, but I would rather have a few too many, than a few too short.
      My thread:
      http://www.fornobravo.com/forum/f8/d...ress-2476.html
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      http://spreadsheets.google.com/pub?k...Xr0fvgxuh4s7Hw
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      • #4
        Re: how many 80 pound bags?

        I used a couple of slab calculators which may help you out. The first one will give you the number of cubic yards needed (27 cubic feet in a cubic yard) and the second one allows you to enter the number of 80 pound bags you have and it will tell you how much concrete you will get. I threw in you numbers and asudavew's 19 bags seems like a good number!

        http://www.concretenetwork.com/concr...caluclator.htm

        Standard Pre-Mix Bag Concrete Quantity And Cost Calculator

        Cheers, Versachi
        "Opportunity is missed by most people because it is dressed in overalls and looks like work." Thomas A. Edison

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        • #5
          Re: how many 80 pound bags?

          Concrete Slab Calculator - The Concrete Network
          Your link said 'page not found' but found the site. Sometimes they time out especially if you link to something already calculated. This one worked when I tested it.
          Last edited by Archena; 09-26-2007, 08:16 PM.
          "He is no fool who gives what he cannot keep to gain what he cannot lose." - Jim Elliot

          "Success isn't permanent and failure isn't fatal." -Mike Ditka
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          • #6
            Re: how many 80 pound bags?

            Here's the simple excel concrete calculator I made when I was pouring my benches and columns. Enter your dimensions in the yellow area.

            It seems to work pretty well for 80 lb bags - I really haven't purchased 60lb bags - but it oughta work.

            I used it so regularly during my construction phase I thought I'd send it along.

            Christo
            Attached Files
            Last edited by christo; 08-03-2009, 10:39 AM.
            My oven progress -
            http://www.fornobravo.com/forum/f8/c...cina-1227.html
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            • #7
              Re: how many 80 pound bags?

              Get a few extra. It's always easier to return a bag or two at your leisure later in the week than to race out like a madman in the middle of a pour.
              Mike - Saginaw, MI

              Picasa Web Album
              My oven build thread

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              • #8
                Re: how many 80 pound bags?

                Been there done that for sure!

                I always add an extra bag to the list. Maybe more if I over excavate or know I'll be pouring more soon.

                I've had 3 bags sitting on top of a milk crate in the backyard covered by plastic for 6 months and they did not go hard on me. Keeping them dry and off the ground is key for storage.

                When I was making my concrete cap stones, I was pretty happy with the accuracy of the calculations. Excavations are totally different.

                Christo
                My oven progress -
                http://www.fornobravo.com/forum/f8/c...cina-1227.html
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