Step 3 replacing rotten plywood.
Shingling a steep roof.
Scaffolding and rappelling gear will provide the safety you need.
Step 1 safety.
Starting at the bottom of the roof lay down a single starter course shingle allowing about an inch to clear the edge of the roof.
How to reroof a steep pitched roof.
Step 4 determining the amount of shingles.
Many pros shingle in a vertical line up the roof because it s much faster.
You will need the right equipment to be safe while you work.