Foundation For Construction Dimension(s) 12×6 Quick Assembly Standard Shed Base. Construct a foundation for a garden structure utilizing an EcoBase Quick Assembly Base Kit. Serving as a sustainable substitute to pavement slabs or wet-mix cement, Ecobase Quick Assembly is composed of upcycled grids that link together to furnish you with a foundation for your garden structure that is stable, robust, durable, and effectively drained. Foundation For Construction Dimension(s) 12×6 Quick Assembly Standard Shed Base