Profile: Koreteck offers panelized building system. We offer flat steel products & coated steel used in construction and steel building components. Our Koreteck™ system is a series of connected panels that can be installed rapidly. It is made with a solid galvanized 20-gauge steel core surrounded by Perform Guard® EPS insulation, with heights up to 18-feet (stackable for greater heights) & widths from 2 to 4 feet and has solid, noncavity construction in 6- or 8-inch thicknesses.