When you build a shed roof, like any other roof, you should consider the load that your roof will be taking. For example, if you know that the winter in your area comes with a heavy snow downfall then you should put extra braces. Your roof should last a long time and should not cause you any problems. A garden shed would need good storage areas such as shelves, cabinets and chests for storing chemicals and fertilizers as well as a safe area for storing sharp garden tools. For some, a shed ramp is also necessary if you decide to store a large grass mower. Barn sheds this is usually the largest. Many barn sheds utilize packed dirt flooring which can accommodate small heavy machineries. This is the time that you may need to build a shed. Although there are some sheds that can be bought pre fabricated, sometimes they may not provide the size and shape that you require, plus, they can be a bit pricey. Building your own shed will allow you to customize its size and the storage space inside, like shelves and cabinets for optimum storage. Make sure that the bricks are tightly packed so that water could not seep in. Don t forget to leave an opening for your door and windows. Step 5. Leave a gap of about three to four inches for ventilation for the frame of the roof. Connect your lumber from one side of the post to the other. Make a six inch overhang for each lumber. Second, check with your local planning and zoning commission and show them your building plans. This way, you can be assured that you will have no problems with the authorities later on. Now let s start building. It is imperative that you have all your materials prepared before the actual building process. One option is to get a plan online, while there are free plans available, most of them are not complete, so there s really no point in getting any of them as it may even cause you more problems. What if the plan you got did not have any guidelines in laying the foundation? Without a complete detailed list of the materials needed, you may end up buying, more than what s needed.