Hot-rolled steel purlins predate modern metal building systems by decades. A multitude of industrial buildings constructed since the beginning of the twentieth century utilized hot-rolled channel and ...

Cold-formed C and Z purlins are the workhorses of the industry. Configurations of these members have originated at the bending press they represent the two basic ways to bend a sheet of metal into a ...

And that's a bargain when you consider the benefits. A metal roof typically lasts 30 to 50 years and instead of covering the whole roof with plywood, you just nail a few 2x4 “purlins” across the ...