Gaps along the floor of a new grain bin Grain bin with spray foam solution 
Installing spray foam around the inside of a new gran bin
Bins are meant to keep grain dry. If the bottom ring is not properly sealed to the floor, bins don’t keep the water out and the grain doesn’t stay dry.
We’ve been using spray foam to successfully seal the floors of grain bins for years. We have done it on the inside and on the outside. The pictures below show interior work, and this is our preferred
