Purlins are essential structural components in the construction of pre-engineered buildings (PEBs). Typically made from cold-formed steel, purlins provide support for roof and wall sheeting, ensuring the structural integrity and stability of the building. They are designed to withstand various loads, including the weight of the roof, wind, and snow loads, and distribute these forces evenly across the structure.

Purlins come in different shapes and sizes, the most common being Z-purlins and C-purlins. Z-purlins, with their distinctive Z-shaped profile, are often used in larger buildings due to their ability to overlap at joints, providing added strength and continuity. C-purlins, with their C-shaped profile, are typically used in smaller structures and can be easily installed.

The manufacturing process of purlins involves precise engineering and fabrication to ensure high quality and durability. Modern techniques allow for the customization of purlins to meet specific project requirements, making them a versatile solution for various types of buildings, including commercial, industrial, agricultural, and residential structures.