Purlins & Top Hats
Product Overview
Roofmart offers a range of high-quality purlins and top hats for your metal roofing and fencing projects. Manufactured locally from Australian BlueScope Steel, they are available to complement the COLORBOND® range and come in a wide selection of strengths, lengths, and thicknesses.Â
For light-weight constructions, purlins may be used in place of structural steel (for an engineer-certified design).Â
Top hats are ideal for use on commercial and light industrial buildings, as well as sheds and for projects where a larger roof span is needed.
Our products are fire, pest, and corrosion resistant, easy to store and handle, won’t crack or warp, and enable fast installation using self-piercing fasteners. These products are engineered to withstand Australia’s harsh conditions and carry the BlueScope Steel warranty. Â
Key Features
- Manufactured from GALVASPAN® steel
- 100mm to 400mm
- Cut to length
- Punched or unpunched
Technical Specifications
Top Hats Data Sheet
Download PDFPurlins Data Sheet
Download PDFComplete System
Roofing Sheets
- Roofing sheets in your chosen material and length
- Calculate your requirements based on your roof area plus 10% allowance for wastage
Fixings & Fasteners
- Roofing screws (weather sealed)
- Hex Head Type 17 Screw with EPDM Washers for timber supports
- Allow 8-10 screws per square metre of roof area
Ridge Capping & Flashings
- Ridge capping for rooftop peaks
- Barge flashings for gable ends
- Apron flashings for wall junctions
- Valley gutters for roof valleys
Guttering System
- Quad or fascia gutters (half round or flat back)
- Downpies & brackets
Support Structure
- Purlins/battens (if not existing)
- Appropriate spacing to suit the corrugated profile
IMAGE CREDIT:Â Â https://colorbond.com/
Photo by:Â Matthew Moyes | Built by: Phil Kelleher Homes
DIY Installation
Tools You’ll Need
- Cordless drill with hex bits
- Measuring tape and chalk line
- Metal-cutting circular saw or angle grinder
- Ladder or scaffolding
- Safety equipment (harnesses, anchors, non-slip footwear, eye protection)
Safety First
Installation Overview
IMAGE CREDIT: https://colorbond.com/inspiration/gallery
Builder:Â Saltbox Building | Designed by Rama Architects
Measure & plan
Calculate how many sheets you need. Mark purlin positions.
Prepare the structure
Install purlins and roof batterns, ensure they are correctly spaced and level.
Add guttering
Complete the rooftop water management system, including downpipes.
Install roofing sheets
Begin at one end, overlap sheets correctly, and maintain straight lines.
Secure sheets
Use the appropriate screws in the correct positions.
Install flashings
Seal all joints and roof penetrations.
Wash down
Thoroughly wash down to clean off swarf (metal shavings)
Frequently Asked Questions
Purlins are horizontal beams used as secondary framing to support the roof of a building or other construction. They span between walls or rafters and support the roof sheeting, providing stability by distributing loads evenly and stabilising against wind and other environmental forces.
Top hat sections suit a wide range of applications including sheds, light industrial, and commercial buildings. Used as purlins or girts, they’re well-suited to roofs requiring greater span capacity.
C Section purlins are suited to non-continuous span applications such as roofing, wall cladding, flooring, portal frames, and similar, simpler constructions. Z Section purlins feature a broad flange and a narrow flange and are designed to lap at internal supports. They are stronger and better suited to projects with longer spans and when greater strength and load-bearing capacity are required.
It’s simple! Just get in touch with us to get the ball rolling.