I have a fairly nice 18 foot grain bin (Butler) that I modernized on a new foundation. Added an aeration floor, fan, and unload auger. Originally the bin was 6 and one-half rings high. Didn't use the one-half ring, but did add one more full ring to make the bin seven rings high. The bottom ring is basically the same gauge as the 2nd from the bottom ring. The bottom two rings are made up of pieces that weigh about 70 pounds each (six per ring). As you go up the pieces weigh less. Most say I do not need to add stiffeners (two per section of ring - 12 total around the bin) if I am putting dry corn in the bin. They say the rings give way because higher moisture corn sticks to the side and then settles pulling down on the side causing the sheets to crush down. Corn going in will be dry - 14.5 percent. I have a similar bin, 7 rings high and it does fine. The problem is I don't know if it has heavier sheets at the bottom. I can still put stiffeners on and would probably only need to go a couple rings high. If dry corn and/or beans are OK then it would be over kill. Ideas would be appreciated. Thanks.