C-Section Purlins are fixed to the sides and gable-ends of a building, providing reliable support for wall sheets. They come in varying lengths, depths, and gauges to accommodate the specific size and requirements of the building.

The specification of the C-Section Purlin is determined by factors such as the size of each bay, the building width, the end-to-end span, and load factors, ensuring the appropriate strength and support for the structure.