What are the Types of Purlins?
Purlins come in four types: compression, tension, shear, and thrust. Each has the characteristics that make it ideal for a certain type of application. Compression purlins resist the outward pull of a load, such as a roof panel or door. They are usually made from metal or plastic and have coils that pack together to create resistance. The tension purlin resists the inward push of a load, such as a window or a door. It is usually made from metal and has slots that extend along its length to create resistance. Shear purlins resist the lateral forces that can cause a collapse in an object, such as a beam or column. They are usually made from metal and have blades at either end that spread the force across the width of the purlin. Finally, thrust purlins resist the vertical forces that can ca...