Question: what are the layers on a roof?
Answer: Decking. The roof deck is the roof layer (also called sheathing) that is installed between the trusses & joists and underlayment layer in a typical roof install. ...  Starter Strip. Starter strip shingles are a strip of shingles that line every edge of your houses roof. ...  Underlayment. ...  Shingles. ...  Ridge Caps.