... -static 2)fireproof,keep warm 3) environmental protection 4)low cost,fast delivery Roof sandwich panelcharacteristics: 1, the quality of light ... per square meter of less than 24kg, can reduce the cost of the structure. 2, quick installation of light weight, ... be matched with any style of the building takes 6, insulation insulation material commonly used are: rock wool glass fiber, cotton, polystyrene ...