Metal roof
I would put a metal roof on it. They are made for low slope roofs, last 30 years and are light in weight. You don't need decking for a metal roof. Build your framing and then put 2x4 purlins every 2' to screw the metal panels to.
I would put a metal roof on it. They are made for low slope roofs, last 30 years and are light in weight. You don't need decking for a metal roof. Build your framing and then put 2x4 purlins every 2' to screw the metal panels to.