AISSI HiTEN LC/LZ Shape Purlin Another product of Architecks Metal Systems, Inc. is the Lightgage Pre Engineered Rigid Frame known as AISSI. It is made from hot-dipped Zinc Coated Steel. AISSI Purlins are accurately shop fabricated and assembled at site using all bolted connections. No more expensive jobsite welding job and delivered cut to size. 2022-10-25 Denver Editor