This will be the rafters length. Cut the rafters from 24 piece of wood. How To Build A Shed Part 4a Ridge Beam Rafters Building A Shed Shed Shed Storage Purchase timber and any other wood necessary according to the engineers plans for the trusses. How to make homemade shed trusses . Have plans for trusses drawn up according to your preferred style and ensure that those trusses will be able to support the weight of the roof as necessary. Video 4 How To Build Homemade Trusses For The Shed. The next step is to put the top of these truss halves together then double check the bottom measurement from outside truss edge to outside truss edge. 101313 1030 AM. Step 2 -- Purchase Timber. How to Build a Shed - How To Build Roof Trusses - Video 4 of 15. After you watch this video youll see how easy it is to build your trusses. Assemble all the trusses that you made and need for your shed in a level surface. After you watch this video youll see how easy it is to build your tru