In the seemingly ceaseless quest for additional storage space, many homeowners look beyond the walls of their home and in their backyard. Here, a shed can provide the extra square footage needed to hold everything from patio furniture to gasoline. Of course, whether you're buying a prefab model or custom-building your own, a shed needs a foundation. While shed foundations take many different forms, the best are poured concrete slabs. With its fast strength gain, high durability, and low shrinkage, Rapid Set Concrete Mix is an ideal choice for the purpose.