The polyurethane roof panel is composed of 2 layers of weather-proof colored steel sheets and jetted the hard forms of polyurethane between 2 layers which feature fireproof materials. It divided into two types: The three waves of polyurethane composite roof panel, The four waves of polyurethane composite roof panel. The characters of PU roof panel are heat insulation, waterproof, soundproof, and easy to install. The excellent function is the reason that so many people choice it as roof board.