Thank you for your interest in Nick's work. Nick did not specify the manufacturer. The material is standard galvanized corrugated metal. He selected the material for its' low cost and maintenance and expected long life. Traditionally in Texas, this material will age gracefully, dulling and eventually acquiring some rust. We do recommend installing it in a "rain screen" fashion, which allows an air gap between the metal and the buildings waterproof sheets. You may want to order a standard and a heavy gauge galvanized corrugated metal to make a comparison. Both have been used for inexpensive siding and roofing for decades.