How to build wooden roof trusses. updated on june 14, 2016. mlowell. more. roof trusses. generally, 2x6 or 2x8 size timber is used, but for smaller home additions, sheds, and buildings, 2x4s may be sufficient.. Building a roof truss over a shed can be a somewhat lengthy process but is fun nonetheless.it is important to note that a roof truss is designed not only to support the roof that you plan on building over the shed but the roof truss also helps to stabilize the walls of the shed.. The two side truss will have gussets only on one side. cut two 2
