... Structure waterproof, thermal protection and insulation, structure maintenance adopt EPS (Expanded polystyrene) panel, rock wool, or other insulation color steel ... panel, 0.42mm color steel sheet ,density of polystyrene foam (EPS sandwich panel) is 12kg/m3, Heat Insulated coefficient ... /.k.6Roof Panel50mm EPS sandwich panel, 0.35mm -0.42mm color steel sheet, density of polystyrene foam is 12kg/ ...