We produce precast concrete foundations used primarily for propane and anhydrous ammonia tanks. The benefits of purchasing precasted foundations vs having them poured in place are: Convenience. We try to maintain an inventory adequate to have most models available. Our piers are poured in a single pour. To compare pouring a single pour vs the 2 pours required to pour them in place is comparing apples to oranges. It is difficult and almost impossible to get the air out of the concrete when pouring the piers right side up especially in the top of the footing and radius. The curves of our molds are correct and the same every time. Many people have made costly mistakes with the forming of a proper radius.