Structural Purlins (C, Z, Sigma)

C Purlins

Depth (H)	Flange (F)	Lip (L)	Thickness (mm)
80 mm	40 mm	10-15 mm	1.5 - 2.5
100 mm	50 mm	10-15 mm	1.5 - 3.0
150 mm	50/60 mm	15-20 mm	1.5 - 3.0
200 mm	60/70 mm	15-20 mm	1.8 - 3.0
250 mm	70 mm	20 mm	2.0 - 3.0
300 mm	80 mm	20 mm	2.0 - 3.0

High Strength-to-Weight Ratio: Offers excellent structural stability while keeping the overall dead load of the building low.
Cost-Effective: Significantly reduces steel usage compared to traditional hot-rolled steel sections.
Easy Installation: Pre-punched holes allow for immediate bolting on-site, eliminating the need for welding or cutting.
Corrosion Resistance: Manufactured from galvanized steel (120GSM to 275GSM), ensuring long-term durability against rust.

Depth (H)	Flange (F)	Lip (L)	Thickness (mm)
150 mm	50/60 mm	15-20 mm	1.5 - 2.5
200 mm	60/70 mm	15-20 mm	1.8 - 3.0
230 mm	75 mm	20 mm	2.0 - 3.0
250 mm	70 mm	20 mm	2.0 - 3.0
300 mm	80 mm	20 mm	2.0 - 3.0
350 mm	100 mm	25 mm	2.5 - 3.5

Continuous Span Capability: Z sections can be overlapped (lapped) at supports, which significantly increases structural continuity and strength.
Material Savings: The ability to lap allows for longer spans with lighter sections, resulting in up to 40% steel savings.
Transport Efficiency: Z purlins are stackable (nestable), which means more quantity can be transported in a single truck, reducing logistics costs.
Flexibility: Can be used for both simple spans and continuous spans, making them highly versatile for engineers.

Depth (H)	Flange (F)	Web Rib (R)	Thickness (mm)
200 mm	60-80 mm	20-30 mm	1.5 - 3.0
220 mm	70-80 mm	20-30 mm	2.0 - 3.0
250 mm	70-90 mm	20-40 mm	2.0 - 3.5
300 mm	80-100 mm	20-40 mm	2.5 - 3.5

Superior Strength: The unique ribbed web design provides higher torsional rigidity and resistance to buckling under load.
Geometry Optimization: The shape allows the center of gravity to be closer to the shear center, minimizing twisting.
Easy Connections: The flat web surface facilitates easier and stronger bolted connections compared to standard C/Z sections.
Maximum Efficiency: Offers the highest strength-to-weight ratio among all cold-formed sections, ideal for very long spans.

Top Flange	Height (H)	Bottom Flange	Thickness (mm)
40 mm	40 mm	20 mm	0.8 - 1.5
50 mm	50 mm	20 mm	1.0 - 2.0
60 mm	40-60 mm	25 mm	1.0 - 2.0
80 mm	50-80 mm	30 mm	1.2 - 2.5

Direct Fixing: Provides a wide, flat top surface that makes screwing roofing sheets or solar clamps fast and secure.
Lightweight yet Rigid: Extremely light compared to box sections but offers high stiffness due to the hat shape.
Versatile Installation: Can be installed directly over existing roofs or purlins without adding significant dead weight.
Screw Retention: The geometry ensures excellent screw pull-out strength, vital for holding solar panels against wind uplift.