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Alton, Ia | 11" WOW.
We've got a 12 ton bin on a 6" pad, poured 30+ years ago, no cracks. We did dig down under the leg spots, IIRC, maybe a couple inches.
If like another poster mentioned, you'll have a minimum charge, pour a bigger pad. Concrete on a farm is kinda like that celebrity comment I heard once- "you can never be too rich or too thin".
What's as or more important than concrete thickness is the prep underneath. Good solid clay, pour thin. Squishy silt, pour thick.
Edited by Oliver1 3/5/2016 12:36
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Bulk bin pad...??
