Light-gage purlins of 8 to 12 in in depth can span 25 to 30 ft ... Cold-formed purlins are normally made of high-strength steel. Uncoated cold-formed members, still in the majority, usually conform to ...

Hot-rolled steel purlins predate modern metal building systems by decades ... The main advantage of hot-rolled steel beams lies is their higher load-carrying capacities as compared with light-gage ...