How to build a slanted roof shed: step by step step 1: gathering requirements. as i began thinking about my new shed, i considered my needs. i decided to build a bigger shed with more space. i wouldn’t have to move the lawn mower to get to the ladder, or the snowblower to dig out the generator.. If you are building your own shed, you should probably consider a number of different shed roof plans before making your final decision. a roof is so much more than a way to keep the contents of your shed clean and dry. the right shed roof design will not only keep out the elements, it can provide you with a significant amount of extra storage space.. Building a loft in the roof cavity is easy and provides much more storage space than either the gable or saltbox sheds. how to frame a gambrel shed roof. saltbox shed roof. do you want to build a shed that makes a perfect garden shed? the saltbox roof design offer lots of character and charm to the backyard..