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 ...

Structurally, roof covering may resist wind and live loads and may serve as bracing for roof purlins. Metal roofing is among the most attractive features pre-engineered buildings have to offer, having ...

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 ...