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Custom Cut .48 BMT COLORBOND® Roofing Corrugated Iron Sheets

Thicker than standard corrugated roofing sheets, available in various colours and custom cut to your required lengths. 


 ✔ Minimum recommended roof pitch: 5 degrees

 ✔ Sheet height is 16mm, and width is 850mm with 762mm of cover – allowing for 1.5 rib overlap.

 ✔ Delivery is approximately 4 - 7 working days, depending on location. 

 ✔ Thicker and more substantial than standard .42 Base Metal Thickness (BMT) roof sheets

 ✔ 100% Australian steel, backed by the Bluescope warranty


Dimensions & Details : 

  • One lineal meter weighs 3.3kg
  • Sheet tolerance: length + 10mm to 15mm, width +/- 4mm to make allowance for thermal expansion or contraction at sheet ends on long roof lengths
  • Mass: 4.9kg/m²
  • Screws per m²: 5
  • Refraining from scheduling any installation until all products have been received on-site is advisable.

Which fasteners do I use for corrugated iron sheets?

We recommend class 4 screws due to their durability and longevity. For standard roofing application to timber or metal purlins, view our range of Multifix screws to make the job easier.


We use only the best 100% Australian steel for 100% peace of mind, made from BlueScope’s industry-leading brands such as COLORBOND® and ZINCALUME® steel. And, of course, all our products are extensively performance tested, backed with the strength of the BlueScope warranty and can be relied on with total and absolute confidence. 


How many fasteners per sheet? Three for internal spans and 5 for single/end spans. Avoid fastening on overlaps to prevent leaks.


What is the maximum recommended spacing of supports for normal conditions (mm)? Roofs: end spans 1300, internal spans 1700, unstiffened eaves overhang 250, stiffened eaves overhang 350. Walls: end spans 2700, interior spans 2700.

Order CUSTOM ORB® .48 BMT COLORBOND® roofing and walling sheets from Bluescope Steel for your project. Enjoy easy online ordering with fast delivery to your location in no time.
Please note this is the .48 BMT thickness sheet.  Please see other listings if you require the standard .42 BMT sheet.  Get better quality corrugated iron sheets with CUSTOM ORB® .48 BMT COLORBOND® roofing and walling sheets from Bluescope Steel.

0.42 bmt meaning :

"BMT" stands for "Base Metal Thickness," referring to the steel thickness used in metal roofing and cladding products. The following number, such as "0.42," represents the thickness of the steel in millimetres. In the case of "0.42 BMT," this would indicate that the steel used in the metal roofing product is 0.42 millimetres thick. This thickness is typically used for residential roofing and it is suitable for moderate weather conditions. BMT thicknesses are available in various options, including 0.35, 0.42, 0.48 and 0.60, suitable for different climates and weather conditions.

It is among the world’s most popular metal roofing products due to its high quality and versatility. These corrugated iron roofing panels, or Custom Orb, suit traditional and contemporary roofing projects.

General Info

COLORBOND® roof and cladding sheets are available in various colours to match any building project and are made in Australia using BlueScope steel. Corrugated COLORBOND® is one of the most durable, long-lasting roofing materials available, and it’s virtually maintenance-free. Made from hi-tensile steel, this profile, whilst strong, is also lightweight, minimising sheet damage.

Corrugated sheeting is pierce-fixed, ensuring easy fixing by the conventional method. To provide maximum weather protection, our Corrugated has a 1.5 rib overlap. The wide cover (762mm) allows for quick installation, saving on materials and labour. This versatile profile can be used on a minimum roof pitch of 5 degrees.


Here at Metal Roofing Online, we only use and recommend Class 4 screws when installing your roof sheeting, as they last considerably longer in the elements. In a standard roofing application, when fixing to either timber or metal purlins, we have a Multifix screw which is the perfect choice for this roofing iron.
When using the corrugated iron sheet in a wall cladding application, there is a choice between 12 gauge x 25 mm timber fix screws when fixing into the timber. Otherwise, ten gauge x 16mm will do the trick when fixing steel. These screws are shorter as they are fixed into the corrugation's pan (or valley). "Cover of roofing sheet": is the measured amount each sheet will cover (including the side lap) when laid in position on the roof. IE, the cover of a corrugated roof sheet is 760mm or .76 metres. Please consider both resistance to wind pressure and foot traffic for roofing spans. 

Please consider a couple of factors when deciding whether you need .42bmt or .48bmt sheets as roof covering:

Your batten spacing and how often the roof will be walked upon
The maximum recommended support spacings are based on testing by AS1562.1-1992, AS4040.1-1992 and AS4040.2-1992.

Roof spans consider both resistance to wind pressure and light roof traffic (traffic arising from unplanned maintenance).

Maximum Support Spacings (mm)
Types of Span BMT (mm)
0.42 0.48
Single Span 700 800
End Span 900 1300
Internal Span 1200 1700
Unstiffened Eaves Overhang 200 250
Stiffened Eaves Overhang 300 350
Single Span 1800 1800
End Span 2500 2700
Internal Span 2700 2700
Overhang 200 250
For roofs: the data are based on foot-traffic loading.
Walling Sheet spans - please consider wind pressure only.


COLORBOND® steel has evolved significantly in response to building industry demands since its introduction in Port Kembla, Australia in 1966. Not only has the colour palette evolved, but so has the technology used to manufacture COLORBOND® steel. BlueScope introduced Activate® technology in 2013, and the company holds numerous patents on the technology in Australia and around the world.Available in a wide variety of colours, Corrugated Roof and Wall Cladding is extremely durable in almost all environments.

Savings on costs

End laps are eliminated, allowing the roof to be laid from the eaves to the ridge in a single operation, reducing installation time.

Durability: Corrugated Colorbond Steel

High tensile steel, galvanised, zinc or colour finishes provide long life.HIGH STRENGTH Rolex is designed to be a lightweight sheet for ease of construction and handling while still providing maximum structural properties and damage resistance in service.For long life, colour, zinc, or gal are used. Cut-to-size sheets eliminate end laps and allow the roof to be installed from the eaves to the ridge in a single operation, cutting installation time in half.

Large Coverage: Corrugated roofing sheets

When a side lap of 112 corrugations is used, the effective cover is 762mm.PITCH ON THE ROOFA low pitch of 5° can be achieved with 1½ corrugations side lap. Corrugated roof and wall cladding require a minimum roof slope of 5 degrees (1 in 12)


Corrugated Iron COLORBOND® or Custom Orb is the product of choice for roofing and cladding applications worldwide. Its corrugated iron profile adds a distinctive look to traditional and modern projects.

COLORBOND® is extremely popular because of its:

Use it as roofing sheets or as wall cladding: your only limitation is your imagination.BMT strength of.42 or.48 Hi-tensile steel has an extremely high strength-to-weight ratio, making the sheets easier to handle, less expensive to install, and one of the longest-lasting products on the market, with a life expectancy of at least 50 years.

Corrugated Iron Cover: With a sheet width of 762mm, fewer sheets are required, and installation time is reduced, resulting in a lower cost.

Weatherproof properties 1.5 rib overlap creates a snug weatherproof barrier that protects your home. Colorbond is also resistant to pests and is wind-rated.Visual appeal—a wide range of colours allows you to make a visual statement with your cladding or blend into the environment—the choice is yours.Corrugated Roofing
When walking on the corrugated roof and wall cladding, wear flat rubber-soled shoes and keep your feet on the ribs, avoiding the last rib or two near the metal roof area.

Elevate Your Roofing with COLORBOND® Corrugated Iron: A Timeless Statement


In the world of home improvement and DIY projects, the importance of choosing suitable materials cannot be overstated. Regarding roofing, one name stands above the rest – COLORBOND® Corrugated Iron. This comprehensive article and video review will delve into the range of outstanding features and benefits of COLORBOND® Corrugated Iron, helping you decide on your roofing needs.

Unparalleled Advantages

  1. Durable Defense Against the Elements

  2. When faced with the wrath of Mother Nature, COLORBOND® Corrugated Iron stands strong. Crafted from renowned Australian BlueScope Steel, a symbol of durability, this roofing material is engineered to withstand the harshest weather conditions, from scorching summers to torrential rains.

  3. Vibrant Range of Colors

  4. Who says roofs have to be dull? COLORBOND® Corrugated Iron breaks the mould with a stunning spectrum of captivating colours. Whether you're drawn to the soothing hues of nature or the bold shades of modernity, there's a COLORBOND® hue that perfectly complements your vision.

  5. Low Maintenance, High Appeal

  6. Say goodbye to endless maintenance and welcome a roof that retains its splendour with minimal effort. The sleek, painted surface of COLORBOND® Corrugated Iron resists peeling, chipping, and cracking, ensuring your roof remains elegant without demanding constant attention.

  7. Energy-Efficient Innovation

  8. In an era where energy conservation is paramount, COLORBOND® Corrugated Iron emerges as a hero. Its Thermatech® solar reflectance technology deflects a significant portion of the sun's heat, resulting in a cooler interior and reduced energy expenses. This eco-friendly aspect also contributes to a greener footprint for your household.

Convenient Online Ordering Through Metal Roofing Online

Commencing a roofing project should be as convenient as it is exciting. As an Australian homeowner, you'll appreciate the efficiency of ordering COLORBOND® Corrugated Iron through Metal Roofing Online. Tailored and designed to enhance modern living, this online platform offers a seamless installation experience aligned with your busy lifestyle.

Navigating Your Purchase: A Step-by-Step Guide

Step 1: Exploring the COLORBOND® Collection

Initiate your journey by exploring the vibrant array of COLORBOND® shades. From classic colours to contemporary styles, each colour tells a unique story. Consider your home's architectural style building materials, the surrounding environment, and taste as you browse the options.

Step 2: Calculating the Quantity

Accurate measurements pave the way to saving money and yourself for a successful residential roofing project. Utilize Metal Roofing Online's user-friendly tools to calculate the necessary quantity of COLORBOND® Corrugated Iron. This prevents wastage and ensures precise ordering.

Step 3: Placing Your Order

With your selection made and measurements in hand, it's time to place your order. Metal Roofing Online's well designed and intuitive interface simplifies the process, allowing you to customize your order and proceed to installation and checkout effortlessly.

Step 4: Professional Delivery to Your Doorstep

Relax as your chosen COLORBOND® Corrugated Iron is delivered directly to your doorstep. Metal Roofing Online's commitment to timely and secure delivery ensures your building project stays on track without unnecessary delays.

Step 5: Unveiling the Transformation

As your roofing project takes shape, the transformative power of COLORBOND® Corrugated Iron becomes evident. Watch as your home gains renewed allure and a more steel shield of protection and security that will endure for years to come.

Conclusion: Elevate with COLORBOND® Corrugated Iron

In the realm of roofing excellence, COLORBOND® Corrugated Iron shines brilliantly. Its durability, aesthetics, sustainability, and innovative design make it a versatile and standout choice for Australian homeowners. As you embark on your roofing journey, let COLORBOND® Corrugated Iron redefine your expectations and elevate your home's appeal. Remember, with easy online ordering through Metal Roofing Online, the perfect choice for transforming your vision into reality is just a few clicks away. Embrace the future of roofing with COLORBOND® Corrugated Iron – where style meets substance, and your home gains the protection it deserves.

"Roofing is not merely about covering a space; it's about making the roof of a building a timeless statement." - Metal Roofing Online.

Incorporate COLORBOND® Corrugated Iron into your home and witness the evolution of steel roofing excellence firsthand.