Overview
Purlins are roll-formed from coated coil, typically with a yield strength from G350 to G450. Z purlins can be lapped over supports to act as continuous beams, which reduces the gauge needed compared with simply supported C purlins.
Design follows AISI S100 or AS/NZS 4600 and needs purlin bridging (sag rods) against buckling. The coating is specified by mass (for example Z275 or AZ150) and governs life in corrosive environments.
Uses
- 01Roof purlins of factories and warehouses
- 02Wall girts
- 03Rooftop solar mounting frames
- 04Secondary framing of canopies
Selection and acceptance checks
- Check base steel thickness and coating mass (Z275, AZ150…)
- Check yield strength on the certificate (G350, G450)
- Check punched hole positions and lengths
Reference standards
- AISI S100
- AS/NZS 4600
- ASTM A653
- AS 1397
For reference only. The standards for each project follow its design documents, current Vietnamese codes and the investor’s requirements.
Reference brands
BlueScopeAustralian steel group making coated and painted steel and roofing, walling and purlin systems.
Hoa SenVietnamese manufacturer of coated and pre-painted steel sheet, steel pipe and plastic pipe.
Hòa PhátVietnamese industrial group producing reinforcing bar, hot-rolled coil, steel pipe and coated sheet.
Brands are listed for reference; World Steel selects suppliers according to each project’s specification.
Sectors and solutions
Sectors
FDI factories Logistics and cold storage High-rise buildings Energy
World Steel services
Steel structures and PEB Design & Build Expansion and upgrade
