` Excellent insulationBecause the polyethylene foamed sheet, which is foamed as high as 40 times, is thermally bonded to the color steel plate, its heat conductivity is very low, and it gives elegancy as the exterior material of buildings and excellent insulation effect.a Corrosion of the steel plate is prevented thanks to its water-proofing and moisture-proofing characteristics. When the product is deposited under the water pressure of 3kg/