Steel sheds the strongest shed finish, this type of shed finish is used in areas where there are harsh climates. This finish is very durable and rugged and provides maximized security against any invader. This though can be the hardest to work with. Aluminum shed best used in temperate climates, aluminum sheds is more affordable than steel sheds. To protect your shed from moisture and ensuring that it will last a long time, it is recommended to use pressure treated wood. It is also essential that your flooring is leveled and all your corners are squared. Seventh step: You will now be able to build your walls. Raise your walls into position and make sure that the braces are sturdy. After clearing up the soil, dig inside your outline with a depth of about eight inches. For the base, transfer inside sand, about two inches will do. Compact the soil and make sure that it is leveled. Using a post digger, dig six holes, three on each side of your outline, about 4 inches deep. You will use this for the posts where you will attach your roof later on. To make this project work, and by that I mean make it serve its purpose and also make your shed look complimentary to your existing home and other structures, there are some essential factors that you need to keep in mind. First things first, if you want your lean to shed to look good and make it seem as it has been with the original plans of your home, you should design your shed to have a finish that is the same as your home. With any structure, the roof is the most critical part, it should be able to withstand a heavy load, protect against the sun, rain and winds, and equally important, look good as well. If your shed looks like an eyesore, then maybe the convenience it brings is not worth it, especially if your neighbors and guests complain about it. Another option would be sealing, staining or coating natural wood with polyurethane. Painting your shed is also another great option, just make sure that it will compliment your existing structure found around the shed. When it comes to your roof, wood is also a good option. You may either use plywood decking or wooden shingles.