Foundation For Constructing Size(s) 14×8 Fastfit Standard Shed Base. Establish a foundation for a garden structure utilizing an EcoBase Fastfit Base Kit. Serving as an eco-conscious substitute for paving slabs or cement mix, Ecobase Fastfit consists of reused frameworks that link together to offer a firm, sturdy, durable, and well-drained foundation for your garden construction. Foundation For Constructing Size(s) 14×8 Fastfit Standard Shed Base