SteelPurlins
Cold-formed C and Z purlins and girts — galvanised secondary steel for roofing and wall framing.
Steel purlins are cold-formed secondary members that support roof and wall cladding between the main structural frames. We supply both C-section and Z-section purlins and girts, roll-formed from high-tensile galvanised steel to AS 1397, in a full range of depths and gauges. Sizes and bridging are selected to suit span and wind loading, with material certification provided for compliant construction.
Product Range
C-Section Purlins
Cold-formed C purlins for end bays, girts and applications requiring a single channel profile.
Z-Section Purlins
Cold-formed Z purlins that lap over internal supports for continuous, efficient multi-span roofing.
High-Tensile Galvanised Steel
Roll-formed from G450/G500 high-tensile steel with Z350 galvanised coating to AS 1397.
Full Size & Gauge Range
Depths from 100mm to 350mm in a range of base metal thicknesses to suit span and load.
Cut-to-Length & Bridging
Purlins cut to length with bridging, cleats and bolts available to complete the system.
Common Applications
- Roof purlins for sheds and warehouses
- Wall girts and framing
- Patio, carport and verandah framing
- Industrial and rural buildings
- Mezzanine and platform framing
Relevant Standards
- AS 1397 — Steel sheet and strip (hot-dip zinc-coated)
- AS/NZS 4600 — Cold-formed steel structures
- AS 4100 — Steel structures
Steel Purlins — Frequently Asked Questions
What purlin sizes do you supply?
Cold-formed C and Z purlins from C100 and Z100 through to C350 and Z350 in 1.5 to 3.0 mm gauge, in Z350 or Z450 galvanised coating, punched to your hole pattern.
What is the difference between C and Z purlins?
Z purlins nest and lap at supports, giving continuous spans and stiffer, lighter roofs on longer buildings. C purlins are used for single spans, girts, eave and gable members and where flanges must line up.
Can purlins be supplied punched and bridged?
Yes. Purlins are punched to your schedule and supplied with bridging, cleats and fasteners so the roof and wall framing arrives as a kit.
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