7 Best Of How To Build A Basic Shed Roof Best Images PNG. The first thing you will need to do is find a flat open area with a concrete floor so that you can lay out a 2x4 or 2x6 that is at least as long as your shed is wide. That gives us rise over run of 24.
Build the perimeter of the floor frame by assembling a square box made of pressure-treated 2x8s that is equal to the length and width of the shed. Test the rafter assembly by standing it up and lining it up with the edges of the shed floor. To locate the foundation build the perimeter of the floor frame first.
Circular saw make sure it has a tilting base plate.
Since the ridge of our gambrel roof will run the length of the shed down the center that leaves us with about 4 horizontal feet from the ridge to the outside edge of the shed. You will need to build a number of trusses based on the length of your roof. Now whatever the width of your shed is measure and mark this off on the 2x4. You want the ridge of the gable to be 2 feet.