Here are those factors. Slope of the ramp when choosing the location of your shed, you should put into consideration the space where your ramp will be placed. The length of your ramp is dependent on the slope that you have chosen. Choosing the slope of your ramp is very critical as this will be the determinant on the ease of use and its safety. But, your roofing material should be determined based on the pitch of your roof. What you re after is a roof that does not leak, so feel free to use any material that will help you achieve this goal. Depending on your budget or creativity, you can just buy prefabricated doors and windows. If you have the skills and the time, you can choose from a wide variety of window shapes and styles. You can now pour in your cement for your foundation; it should be about six inches deep and make sure to level it. Leave to completely dry. When completely dry, lay out your bricks. Lay the bricks around the base and when you are finished on all four sides, lay down some mortar and place the next layer. After your application has been approved, you should now have your roof trusses fabricated, if you don t have the tools nor the skills to do this, most lumber yards can do this for you for a minimal fee. When you have the trusses ready, you need to mark the wall of your shed to determine where the trusses will be anchored to usually an interval of 2 feet of space is done. If you want a more durable shed siding, then wood would also be a good option. And with this option, you have many choices. For enhanced resistance in rotting and bug infestation, you may use red cedar. The downside to this is that it can be a bit costly to some. A less pricey alternative is the white cedar. Different combinations of the two elements allow manufacturers to make different types of steel, and this allows them to make structures for a steel shed. As your shed design grows in size, then you would certainly want stronger steel, you can check out their grade. But for other parts of the shed, you wouldn t need steel that are as strong, for example, for the structure or frame, you will need stronger steel, especially the rafters for roof support, but for the walls and the roof itself, sheet metal would suffice, or even corrugated steel sheets.