C-purlins & C-girts
Simple-span members for short bays, wall girts, door and window framing, and light trusses.
Cold-formed secondary steel
C & Z purlins and girts, cut and punched for your building
High-tensile galvanised purlins that carry your roof and walls – supplied with our steel frames, or on their own to Thai fabricators, roofing contractors and builders.
Small members, big influence on cost
Purlins and girts can make up a fifth or more of the steel in a light industrial building. Choosing the right profile, gauge and lap arrangement – and spacing them for the roof sheet you actually use – is one of the easiest ways to save money without touching safety.
We design purlins to AISI S100 together with the main frame, so laps, sag rods and bracing work as one system, and deliver them cut to length, pre-punched and bundled by building zone.
Z-purlins
Nestable profiles that lap over supports to act continuously – stronger and lighter on multi-bay roofs.
Eave struts & girts
Eave members that support roof and wall sheets and tie the frames together at eave level.
Bracing & accessories
Sag rods, rod or angle bracing, flange braces, cleats and purlin bolts supplied as a complete kit.
Sections
Typical sections
| Section | Depth | Flange | Thickness | Typical use |
|---|---|---|---|---|
| C100 – C150 | 100 – 150 mm | 50 – 65 mm | 1.5 – 2.5 mm | girts, short roof spans, framing |
| C200 – C250 | 200 – 250 mm | 65 – 75 mm | 1.8 – 3.0 mm | roof purlins, wall girts |
| C300 | 300 mm | 75 – 90 mm | 2.0 – 3.0 mm | long spans, heavy loads |
| Z150 – Z200 | 150 – 200 mm | 55 – 65 mm | 1.5 – 2.5 mm | lapped roof purlins |
| Z250 – Z300 | 250 – 300 mm | 65 – 75 mm | 1.8 – 3.0 mm | wide bays, solar roofs |
| Z350 | 350 mm | 75 – 90 mm | 2.0 – 3.0 mm | 9 m+ bays, heavy roofs |
Material: high-tensile galvanised strip, yield strength 450 or 550 MPa, zinc coating Z200–Z275 (ASTM A653 / JIS G3302 equivalents). Final sections, gauges and coating are confirmed by design for each project.
Delivered ready to fix
Why our purlins go up faster
Cut to exact length
No site cutting, no off-cuts, no exposed cut ends to touch up.
Pre-punched holes
Holes for cleats, laps, sag rods and girts punched by CNC – bolts line up on site.
Lapped for continuity
Z-purlin laps sized by design for lighter gauges on multi-bay roofs.
Bundled by zone
Bundles labelled by roof or wall zone and grid line, matched to the erection drawings.
Galvanised for Thai climate
Zinc-coated strip resists humidity during storage and service.
Purlin-only orders welcome
Thai fabricators and roofing contractors can order purlins and accessories on their own, CIF or DDP.
FAQ
Questions Thai clients ask us
C or Z purlins – which is better?
Z-purlins are usually more economical on roofs with several bays because they lap over the frames and act continuously. C-purlins suit single spans, girts, openings and framing. Our design uses each where it saves the most.
What purlin spacing do I need?
It depends on the roof sheet profile and thickness, wind zone and span. Tell us the sheet you plan to buy in Thailand and we space purlins to its load tables.
Can you supply purlins without the main frame?
Yes. Send a purlin layout or the roof plan and we quote purlins, girts, sag rods, cleats and bolts, cut and punched, delivered CIF or DDP.
Send us your drawings – receive a priced steel package for Thailand
Structural design, fabrication, fire protection and CIF or DDP delivery in one quotation. Answer within 48 hours.