Foamed polystyrene insulating layer with the thickness of 100m/m in the center, steel wire truss coated with zinc of 3m/m(3.8mm) between the insulating layer is pinned at 2`` intervals, at both sides of which forms up at 5Cm X 5Cm(5Cm X 10Cm) intervals with the wire mesh coated with zinc of 3m/m that is at fine-spun 50m(100m)intervals. So the whole points of contact in all steel wires are joined in a spot welding, which is a panel of 2.4m(4m) full length, 1.2m width, 60~150mm thickness.