PURLINS
LG-01
C & Z Purlins
Cold-formed lipped sections spanning between trusses, lapped for continuity at supports.
C / Z lippedLapped jointsPre-punched
Light Gauge Steel / Roof Framing
The structure that sets every other line.
Cold-formed C and Z purlins, roof trusses and connection sets engineered for the span, pitch and wind zone of your building — and coordinated with the tile fixing grid above.
0–12 mTypical truss span range
0Section types: C & Z
0Fixing grid shared with the tiles
0On-site welding required
4BOLTED ASSEMBLY
System
Light, precise, fast to erect
Cold-formed sections arrive cut to length, punched and labelled. Because the purlin spacing is set against the tile cover width, the framing, underlay and roof surface all share one fixing grid — which removes the most common source of installation delay.
- C and Z sections for purlins, girts and truss chords
- Bolted connections — no site welding or hot works
- Galvanised coating for long-term corrosion protection
- Pre-punched holes set to the roof tile fixing grid
Components
Framing component range
PURLINSTRUSSES
LG-02
Roof Trusses
Site-bolted truss assemblies designed for the project span, pitch and load case.
6-12 m spanBolted webPitch matched
CONNECTIONS
LG-03
Connection & Bracing Sets
Base plates, cleats, bracing straps and bolt packs matched to the structural schedule.
Base platesBracing strapsBolt packs
Technical data
Framing specifications
Typical values for the standard range. Structural calculations and section schedules are issued per project.
| Parameter | Typical value / option |
|---|---|
| Material | Cold-formed galvanised steel strip |
| Common grades | G550 / S350GD with Z275 galvanised coating (project dependent) |
| Section types | Lipped C and Z purlins, truss chords and webs, bracing straps |
| Thickness range | 1.2 mm – 3.0 mm, selected by span and load case |
| Typical truss span | 6 m – 12 m (longer spans engineered to order) |
| Connections | Bolted cleats and base plates; no site welding |
| Coordination | Purlin spacing set to the selected roof tile cover width |
| Documentation | Section schedule, cutting list, setting-out drawing and bolt list |
* Indicative values for illustration. Confirm the current certified data sheet, test reports and project-specific requirements with the QB Roof engineering team before specification or order.
From drawing to delivery
A controlled process
011
Structural input
Span, pitch, wind and load data, plus the architect’s roof geometry.
022
Section design
Purlin and truss sizing, bracing layout and connection schedule.
033
Fabrication
Cut to length, punched, galvanised, labelled by roof zone.
044
Erection support
Setting-out drawings, bolt lists and on-site installation guidance.
Have structural drawings?
Send them over with the roof pitch and span. We will return a framing schedule coordinated with the tile and drainage take-off.
Explore the range