FoundationsThe most common storage shed Foundation are the wooden skid and the concrete slab.I built this storage shed on a skid foundation, it's easier and cheaper to construct, and it allows you to move the storage shed if you need to.How to build a storage shedMaterial for the foundation.2- 4x4x8 Treated Pine for the skids.2 2x4x8 treated pine for bands.7 2x4x93" treated pine for floor joist.2