A building panel structure is disclosed, in which building panels are used to form a structure. Roof panels and roof panel tiles are used to form the roof of the structure. The roof panel includes a core and a coating covering a portion of the core. In some embodiments the core consists of a frame and at least one insulating structural block. The insulating structural blocks can be encapsulated polystyrene (EPS) foam blocks. In some embodiments the coating includes ceramic material. In some embodiments the coating includes a first layer and a second layer. In some embodiments the coating materials are formed into a roof tile before they are coupled to the roof panel core. The roof panel and the roof tile can be shaped, formed, and colored to look like traditional roof tiles such as shake roof tiles or Spanish roof tiles.