Ecobase Fastfit Shed Base kits are designed to provide a firm long lasting base on which to install a garden building. Each kit comprises a number of strong, heavy-duty grids made from 100% recycled plastics that click together, and a sheet of weed resistant membrane to stop weeds growing under the building. The grids are lightweight and simple to install following the instructions provided - they are a lot lighter and easier to handle than paving flags and less messy and much quicker to install than laying a wet-mix concrete slab.