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Western Iowa | Boy I used almost 2 full bundles of 1/2" rebar on each 42ft bin pads I did a couple of years ago.
I did 18" OC on the grid. Wanted to do 12" but figured we'd all be getting our feet stuck raking....... lol
By the time you do 4 circles in the footing and all the 4ft long uprights holding them up it takes a lot of bar
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 IMG_7001 (full).JPG (151KB - 5 downloads)
IMG_7004 (full).JPG (153KB - 4 downloads)
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Amount of rebar in a 48' circle
