... for roof and wall with steel structure. Good Quality, Low cost. EPS Foam Sandwich Panel (expanded polystyrene)Advantages:Light weight, high strength, good water ... popular used in the steel structure buildings or prefab house as wall or roof systemAlso PU(polyurethane), rockwool, glasswool sandwich panel are for ... .326, 0.376, 0.426, 0.476, 0.5mm) EPS foam sandwich panel