Structure For Constructing Size(s) 14×6 Fastfit Standard Shed Base. Establish a foundation for a garden structure utilizing an EcoBase Fastfit Base Kit. Serving as an eco-conscious substitute to paving slabs or liquid-mix concrete, Ecobase Fastfit consists of reused grids that link together to present you with a foundation for your garden edifice that is sturdy, durable, enduring, and well-drained. Foundation For Constructing Size(s) 14×6 Fastfit Standard Shed Base