The completed shed with a slanted roof image first. slant roof style is also known as a skillion, shed or lean-to.it is a single sloping roof and can be thought of as half of a pitched roof.. How to attach roof felt on a shed in this article: cutting your felt pieces cleaning and preparing your roof attaching your roof felt community q&a 11 references roof felt, also known as tar paper, is a waterproof fiberglass product.. Storage sheds are beneficial if you lack storage space to store unused items and tools. building a 5-foot-by-10-foot storage shed with a simple flat roof on already level ground is an achievable task, requiring a few days of work..