Purchasing a Duramax foundation kit along with the shed makes the assembly go even easier. These heavy-duty, hot dipped Galvanized Steel frame kits are the perfect base for DuraMax Sidemate sheds. It eliminates the need for a traditional concrete or slab base. All you need is level ground. If you want additional protection from moisture, a strong plastic sheet should be placed below the entire area covered by the foundation kit. After constructing the metal foundation kit, you can fill it in with concrete for a smooth floor or cover with timber or moisture resistant chipboard. If you intend to use concrete, plan on pouring the foundation to be two inches thick.