The information given below is for building a saltbox style shed, which is the most difficult to build. go to the following links for building a gable style shed or a barn style shed roof.. framing the roof for a saltbox shed. Building a shed roof after building the frame of the utility shed, you need to continue the outdoor project by fitting the rafters and installing the asphalt shingles. there are many ways you can get the job done, but in this article we show you the easiest method.. This step by step diy woodworking project is about how to build a 8