TUV Certified Solar Structure Steel Z Purlins for Construction

The primary advantage of Z Purlins is their Z-shape profile, which allows them to overlap (splice) at supports. This creates a stronger, continuous span, making them ideal for long-span roofing. C Purlins are typically used for wall girts or shorter spans where overlapping is not required.

HDG provides a thick, durable zinc coating that protects the steel from rust, especially in humid, coastal, or industrial environments. It lasts significantly longer than paint or pre-galvanized coatings. Unlike painted surfaces that can chip or scratch during installation, galvanized steel is self-healing at cut edges and requires virtually no maintenance.

These numbers refer to the cross-sectional dimensions: 200 mm: Web height (the vertical height of the beam). 75 mm: Flange width (the horizontal width of the top/bottom lips). 20 mm: Lip size (the length of the small turned-up edge for rigidity). 2.5 mm: Material thickness (usually in millimeters or gauge).

While they are primarily designed for roofing due to their overlapping strength, Z Purlins can be used for walls. However, C Purlins are generally preferred for walls (girts) because they are easier to install without the need for complex overlapping at joints.

Z Purlins are fixed to the main rafters using bolts and cleats (connection plates). To join two pieces together to achieve a long span, you must use splice plates at the overlap point. This ensures the structural integrity of the connection.