Shed plans, roof assembly. building the roof truss for a gable garden shed. simple to follow illustrated instructions to build a shed roof.. If you need space for storage, garden tools, lawn equipment, or whatever the need is, building your own shed is easier than you think. these shed plans are designed. Diy step by step woodworking project about gable shed roof plans. we show you how to build a simple roof for your garden shed, using common techniques and tools.