... strength, 2 flat surface and high performance XPS heat insulation sandwich panelsimple introduction: Structure:Structure: 2 layer ... roofing insulation, etc., and the insulation effect is more remarkable2,Exterior wall insulation:3,Insulation,heat insulation,waterproofing4,Ground floor insulation:5, ... ultraviolet radiation has damaging effects on the XPS,such as deformed and sparkling.Avoid the direct ...