Foundation For Constructing Size(s) 14×12 Speedy Installation Standard Shed Base. Establish a foundation for a garden construction utilizing an EcoBase Fastfit Base Kit. Serving as an eco-conscious substitute for paving slabs or conventional concrete mix, Ecobase Fastfit consists of reused grids that seamlessly link up to produce a foundation for your garden structure that is sturdy, durable, enduring and well-drained. Foundation For Constructing Size(s) 14×12 Speedy Installation Standard Shed Base