Space. We believe that the Ratcliffe sheds are probably the best looking metal sheds on the market. Designed in different sizes you will now find a metal shed to suit your garden space & needs. Strength. Most Important The deep roll-formed wall & roof panels provide unique strength unlike shallow formed clad sheds. Base. Please ensure that when you build your concrete or flagstone base to insert a strong plastic membrane BELOW the concrete or flagstones to prevent rising damp. Build your base NO more than 30mm larger all round than the BASE measurements given below under TECHNICAL INFORMATION to allow rainwater discharging proud off your base at the sides of the Ratcliffe. Instructions. Comprehensive, illustrated step-by-step user instructions supplied. What is a Steel Foundation Kit & do I need one. It is a quick & easy way to create a suitable base for your metal shed after you have leveled your site & inserted a DPC Damp Proof Course below the foundation kit. It is ma