When designing steel structures, selecting the right type of purlin is a key decision that impacts the strength, durability, and overall efficiency of the project. Purlins are horizontal structural members used to support roof and wall panels, and they commonly come in two shapes: C-purlins and Z-purlins. But how do you choose the one that best suits your project?
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First: What’s the Difference Between C and Z Purlins?
C-Purlin:
- Shaped like the letter “C”.
- Often used in vertical wall support or as secondary framing.
- Simple and easy to install.
- Cannot overlap easily with other purlins, making them less suitable for long spans.
Z-Purlin:
- Shaped like the letter “Z”.
- Widely used for roof applications.
- Can overlap (lap joint) to create continuous spans over multiple supports.
- More efficient in terms of strength-to-weight ratio.
When Should You Choose a C-Purlin?
Choose C-Purlin when:
- The project is small to medium-sized.
- You need simple, easy-to-install framing elements.
- The focus is more on wall construction than roofing.
- Overlapping or continuous spans are not required.
When Should You Choose a Z-Purlin?
Choose Z-Purlin when:
- The design requires longer spans between supports.
- Overlapping purlins are needed for extra strength and support.
- The roof has a slope or covers a wide area.
- You want to reduce overall weight without compromising structural performance.
Choosing the right purlin is not just about shape—it’s about matching the structural and functional needs of your project. At Hasanoglu, we provide expert support to help you select the right type of purlin, along with custom manufacturing that meets international standards.
Have an upcoming project? Contact us today and let our experts guide you in selecting the perfect purlin solution.