A 18×14 Expedited Large Shed Foundation. Establish a foundation for a garden structure utilizing an EcoBase Fastfit Foundation Kit. Serving as an eco-conscious substitute for paving slabs or wet-mix cement, Ecobase Fastfit comprises recycled grid components that link together to furnish you with a foundation for your garden structure that is sturdy, robust, enduring, and adequately drained. 18×14 Expedited Large Shed Foundation