Shed roof construction getting the job done now that you have a basic idea of what type of roof you want for your shed, what materials you will need, and what pitch is likely to be best, it is time to start thinking about the actual shed roof construction process.. Garden shed construction storage shed flooring materials how much to reshingle a 10 x 20 shed garden shed construction what is a shadow bank building shed roofs home depot sheds kits 10x12 once flooring is done, you begin with the framework in the shed.. In this manner, you will get a rigid structure and a sturdy garden shed. you should study the building codes before starting the construction of the roof. there are certain cases in which you need to choose a certain slope for your roof, so make sure you are aware of the legal requirements, before starting the actual construction..