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how many 80 pound bags? - Forno Bravo Forum: The Wood-Fired Oven Community

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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

    If at first you don't succeed... Skydiving isn't for you.

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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
      My costs:
      http://spreadsheets.google.com/pub?k...Xr0fvgxuh4s7Hw
      My pics:
      http://picasaweb.google.com/dawatsonator

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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
          [/CENTER]

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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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