COLORBOND Corrugated Steel Roofing — Classic Profile, Built for Australia
Australia's most popular roofing profile. Classic sinusoidal corrugated sheet in COLORBOND or ZINCALUME steel for roofing and walling, 762 mm nominal cover width.
- BMT Range
- 0.42 – 0.48 BMT
- Category
- roofing
- Available Colours
- Monument, Ironstone, Wallaby, Dune, Jasper, Surfmist +4 more
- 762 mm nominal cover width
- 0.42 and 0.48 BMT to AS/NZS 1397 G550
- 5° minimum roof pitch (manufacturer guidance)
- COLORBOND and ZINCALUME finishes
- Custom cut lengths by arrangement
POA
Price on Application
This product is custom-cut, large-volume or project-specific. Submit a quote request and our trade desk will respond within 2 business hours.
Overview
COLORBOND corrugated steel is the defining profile of Australian residential roofing — the classic wave shape is immediately recognisable on homes, sheds and rural buildings nationwide. Sheets are rollformed from BlueScope COLORBOND or ZINCALUME steel to AS/NZS 1397 G550 with pre-painted finishes to AS/NZS 2728. The profile suits roofing and walling with a recommended minimum roof pitch of 5° (1 in 12) per manufacturer guidance.
CSA supplies corrugated in 0.42 and 0.48 BMT with 762 mm nominal cover width (±4 mm tolerance). Standard lengths from 1.8 m to 9.0 m in 0.3 m steps; custom cut lengths to ±5 mm on orders of 10 sheets or more where supplier cutting is available. Availability, dispatch timing and freight are confirmed at order acceptance.
Technical Specifications
| Profile type | Sinusoidal corrugated, roofing & walling |
|---|---|
| Nominal cover width | 762 mm (±4 mm) |
| Corrugation pitch | 76 mm |
| Base metal thickness | 0.42 mm and 0.48 mm (0.35 mm walling; 0.60 mm curving) |
| Mass (COLORBOND) | 0.42 BMT ≈ 4.35 kg/m²; 0.48 BMT ≈ 4.93 kg/m² |
| Minimum roof pitch | 5° (1 in 12) per manufacturer guidance |
| Length tolerance | Custom cut; typically +0 / −15 mm |
| Fixing method | Pierce-fixed (through-fastened) at every second corrugation |
| Steel base | BlueScope COLORBOND or ZINCALUME steel |
|---|---|
| Finishes | COLORBOND Classic & Matt, COLORBOND Ultra (severe marine), ZINCALUME, galvanised |
| Yield strength | G550 (550 MPa minimum yield) |
| Coating | AM100 / AZ150 metallic alloy coating with Activate technology |
| Steel standard | AS 1397:2021 |
| Paint standard | AS/NZS 2728:2013 |
Fixing & Fasteners
- Roofing screws to AS 3566 with sealing (EPDM) washers, sized to substrate and wind classification.
- Class 3 fasteners for general use; Class 4 (Type 316 stainless) within ~1 km of surf coast.
- Five fasteners across the sheet at apex and gutter line; turn-up at apex and turn-down at gutter.
Matching Accessories
- Ridge capping and barge / gable rolls
- Valley gutters and apron / step flashings
- COLORBOND fascia, gutter and downpipe rainwater systems
- Foam closures, sealing washers and touch-up paint
Installation & Handling
- Sheets are long, thin and flexible: support along the full length when transporting and lift on edge with at least two people to avoid kinking.
- Lay with a side lap of 1.5 corrugations facing away from the prevailing weather.
- Maximum pierce-fixed length for light colours is about 23.7 m before an expansion joint; keep dark colours under ~16 m due to thermal movement.
Warranty
COLORBOND steel is backed by BlueScope warranties for eligible applications (corrosion and paint), subject to environment, application and correct installation.
Warranty eligibility and duration depend on your project and location — confirm and register through BlueScope. Manufacturer warranties do not affect your rights under the Australian Consumer Law.
Compliance
Standards & Certifications
High-tensile steel base
Cold-rolled from G550 steel (550 MPa minimum yield strength) with a metallic alloy coating, manufactured by BlueScope to the relevant Australian Standard.
AS 1397:2021
COLORBOND prepainted finish
COLORBOND prepainted steel finishes are manufactured to the Australian Standard for prepainted steel, incorporating Activate technology for corrosion resistance and (in core colours) Thermatech solar reflectance.
AS/NZS 2728:2013
Non-combustible material
Steel made by BlueScope has an Ignitability, Spread-of-Flame and Heat-Evolved index of 0 (zero), so it may be used wherever a non-combustible material is required under the National Construction Code (NCC 2022 C2D10).
AS/NZS 1530.3
Suitable for bushfire-prone areas
Steel roofing and walling can be specified from BAL-12.5 up to BAL-FZ (Flame Zone) using compliant system details under AS 3959 and the NASH Bushfire Standard, which the NCC references as a Deemed-to-Satisfy solution.
AS 3959 / NASH
Designed and installed to standard
Metal roofing and wall cladding is designed, tested and installed to the metal roofing/cladding code, with wind actions assessed to the wind loading standard.
AS 1562.1 / AS/NZS 1170.2
Datasheets, Guides & Certificates
Manufacturer documentation for specification and compliance. Links open the original source documents.
Coating system, Activate and Thermatech technology, standards and durability.
22 core colours (six also in Matt) for roofing and walling.
Check eligibility and register a COLORBOND / ZINCALUME steel warranty for your project.
CSIRO AS/NZS 1530.3 test results confirming Spread-of-Flame index of 0 for BlueScope steel.
Colours Available
Use Cases
- Residential re-roof
- New home build
- Shed & garage
- Rural / farm building
- Feature walling
- Fence panels
Applicable Standards
- AS 1562.1
- AS/NZS 1397
- NCC Section J
- BAL-40 compliant variants
FAQ
COLORBOND Corrugated Roofing — Frequently Asked Questions
What pitch can corrugated roofing go down to?
The recommended minimum roof pitch for corrugated is 5° (1 in 12). Below that, use a low-pitch profile such as Trimdek, Spandek or a concealed-fix system like Klip-Lok 700.
What is the cover width of corrugated sheet?
Corrugated has a 762 mm nominal cover width (±4 mm) with a 76 mm corrugation pitch. Sheets are custom cut to your length.
Which BMT should I use, 0.42 or 0.48?
0.42 mm BMT suits most residential roofing; 0.48 mm gives greater span capacity and better hail resistance for exposed or commercial roofs. CSA can confirm the right thickness for your wind classification.
Is corrugated steel suitable for bushfire areas?
Yes. Steel made by BlueScope is non-combustible (Spread-of-Flame index 0) and can be used in BAL-12.5 to BAL-FZ with compliant system details under AS 3959 and the NASH Bushfire Standard.
Resources
Guides for specifying and ordering
Selection Guide
How to Choose a Roof Profile: Corrugated, Trimdek, Spandek and Klip-Lok
A practical guide to choosing a steel roof profile in Australia. Compare corrugated, Trimdek, Spandek, Klip-Lok and Monoclad on pitch, span, cost and appearance.
Read guideColour Guide
COLORBOND Colour Selection Guide for Australian Roofs
How to choose a COLORBOND colour for your roof. Heat, neighbourhood character, council rules and the full 20-colour palette explained, with light and dark trade-offs.
Read guideHow-To
Roof Sheet Takeoff and Ordering: How to Measure and Buy Roofing
How to measure a roof and order the right number of steel sheets, screws, flashings and gutters. Cover widths, waste allowance and a worked takeoff example.
Read guideNeed COLORBOND Corrugated Roofing for your job?
Order catalogue lines, request a custom-cut order, or open a trade account for volume pricing and net-30 terms.