METAL ROOFING PANELS & MATERIAL MANUFACTURING IN COLORADO Serving Northern Colorado, Denver and Colorado Springs. Flatiron Steel is a premier supplier of metal roofing materials. Our showrooms are located in Greeley and Colorado Springs, CO. We offer roofing supplies for both residential and commercial properties and we ensure the highest quality, paint class, and manufacturing levels. Every building material we supply is completely manufactured in house by highly trained professionals. We sell direct to roofing contractors, residential roofers, and to wholesale suppliers located across Colorado.