Since 1946, Union Corrugating has been a leading metal roofing manufacturer, providing metal roofing products, supplies, and wall systems for residential and commercial buildings.  Watch a video about why you should choose Union Corrugating Metal Roofing Supplies As a leading metal roofing manufacturer, we continually strive to make commercial and residential metal roofing materials that are more durable, beautiful, and energy efficient... commercial and residential metal roofs that save you money while protecting the environment.