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Trimdek ZINCALUME® roofing and walling is the ideal choice for your project.  

These ZINCALUME® Trimdek sheets are for use on a roof pitch of 2° or greater and are an economical roofing, cladding or wall sheet option. This profile is a long-spanning cladding permitting wide support spacing & is a versatile, strong, yet lightweight profile.


What is the sheet cover of the Trimdek Sheets? 

The cover width is 762mm. The actual sheet width is 820mm.

What is the steel thickness?

.42 BMT is the standard thickness of our BlueScope Steel sheets.

Sheet Tolerance: Length: + 0mm, – 15mm; Width: + 4mm, – 4mm Make allowance for thermal expansion or contraction for long-length roofs at sheeting ends

How long does delivery take? 

Delivery takes approximately working 4 - 7 days, depending on the delivery location. 

What fasteners do I use on the sheets?

We recommend a 12 gauge x 65mm Type 17 Hex Head screw when fixing into timber battens. If fixing into steel purlins, please use a 12 gauge x 55mm Steel Fix Hex Head screw. When installing the sheets as wall cladding, a 12 gauge x 25mm Type 17 Hex Head should be used for timber battens. For steel purlins, a ten gauge x 16mm Steel Fix Hex Head screw is preferred.

How much should I allow into the gutter?

Turn your Trimdek Sheets up or down using this Trimdek Tool. It is usual to allow roof sheets to overlap into gutters by about 50mm. If the roof pitch is less than 25° or extreme weather is expected, the pans of sheets should be turned down at the lower ends and turned up at the upper ends by about 80°. 



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. 


Also known as Trimclad, Superdek, Apclad and Monoclad, Trimdek metal roofing sheets are used on roofs with a minimum of 2 degrees of fall or greater.  It is a screw-down metal deck roofing iron, which makes it very easy to install. These roofing sheets are a cost-effective alternative to Klip-Lok roofing sheets. It sits well in both domestic and commercial applications.

Cover width of the sheet - 762mm (same cover as corrugated iron). The neatest way to cut the roofing sheets is with tin snips.

Your home will likely be your biggest financial investment and asset. Having a BlueScope warranty covering the important steel building products in and around your home is an investment in peace of mind.

ZINCALUME® steel is developed for, and therefore more resilient to, the severe sunlight and temperatures typical of Australian environments. BlueScope scientists have tested ZINCALUME® steel in some of Australia’s harshest climates. 

Rest assured that ZINCALUME® steel is guaranteed to meet relevant Australian standards. Ensure you look for the brand, as not all painted steel is genuine ZINCALUME® steel.

Recommended Fastening Method

We recommend a 12 gauge x 65mm Type 17 Hex Head screw when fixing timber battens. If fixing into steel purlins, please use a 12 gauge x 55mm Steel Fix Hex Head screw. When using the sheets as wall cladding, a 12 gauge x 25mm Type 17 Hex Head should be used for timber battens and steel purlins, and a ten gauge x 16mm Steel Fix Hex Head screw is used best.

Trimdek, in particular, pertains to square-fluted steel cladding that is available in long lengths. This means that one sheet can be used from ridge to gutter without having any end laps. Trimdek is remarkably strong (it can easily recover from deformation), has excellent spanning capacity, is lightweight, and is properly rigid. And of course, it is available in a wide variety of colours that Colorbond roofing steel is well known for — earthy colours that reflect Australia's distinct landscapes.

Who is BlueScope Steel owned by?

BlueScope has a long and proud history in Illawarra as an efficient, trusted, and innovative steelmaker.

It arose from the merger of three companies that helped to establish the Australian steel industry in the early twentieth century: The Broken Hill Proprietary Company Limited (BHP), John Lysaght (Australia) Pty Ltd (Lysaght), and Australian Iron and Steel Limited (AIS).

The company began in 1915, when BHP established a steelworks in Newcastle, New South Wales.

Lysaght, a British company, established an Australian operation in 1918 to serve the building and construction industries. Its galvanised corrugated steel has long contributed to the distinctively Australian architectural style.

In 1999, a portion of BHP Steel's assets were spun off as OneSteel. BlueScope Steel, and now BlueScope, were formed from the remaining assets in 2002.

In 2011, Port Kembla Steelworks decided to cut production in half, effectively exiting the export market and operating only one Blast Furnace.

The Port Kembla Steelworks remains the company's largest global operation, producing 2.6 million tonnes of raw steel annually. The company is a global leader in metallic coating and painting technologies, offering a diverse range of branded products, including COLORBOND® steel, ZINCALUME® steel, and the LYSAGHT® building product line. It serves its customers throughout Australia through a network of distribution and manufacturing facilities.

The company's headquarters are at 120 Collins Street in Melbourne, and distribution centres are in Melbourne, Sydney, Brisbane, Perth, and Adelaide.

BlueScope Steel Products in Australia: Who makes COLORBOND steel products?

Choose from 22 natural-inspired colours, including six matte colours. Colorbond® steel is manufactured in Australia under BlueScope steel limited.

BlueScope's COLORBOND® steel is one of Australia's most popular building materials, and it has been an iconic Australian brand for over 50 years since it first rolled off a paint line.

COLORBOND® steel is inspired by the unique duality of Australia's beauty and strength and is built to withstand it. COLORBOND® steel is known for its iconic good looks, but it is also designed with durability, performance, compliance, and sustainability in mind.

COLORBOND® steel is the ideal solution for a wide range of applications, including roofing and walling, garage doors, fencing, sheds, insulated panels, patios, and pergolas, to name a few.

Tips to find metal steel for sale near me



Written by: Leah_Mcewen




There are many people who like to buy steel from a metal supplier, steel supply or even steel for sale near me. There are many advantages of buying these products as they are made with high quality, and you will be able to enjoy different styles of metals that you can select while choosing what way you want it to look like. These metals can be used anywhere in your home or office, such as kitchen cabinets, garage doors, coffee table legs and even hearses. You need not worry about the type of supply because it goes through the right process before it is delivered to your home or office.

Tips for finding metal steel for sale near me

1. The quality

This is the first thing you need to consider when buying steel for sale near me. For example, buy the best quality stainless steel for any home appliance. Make sure that you have checked all quality standards before buying it.

2. The design and styles

There are many designs and styles of steel that are available in a metal supplier, steel supply or even steel for sale near me. Choose one of them according to your wish, and if you want to customize, it is possible because they have flexible designs. You will be happy with your purchase after getting it at your doorstep if you buy from a professional dealer who delivers all types of metals at the right time.

3. The prices

The price of steel depends on the quality and design you have selected. You need to compare the prices from one dealer to another. Also, ensure that you are not paying too much for the metal because there might be some discount offers available in the market as well at a cheaper rate from a different dealer. Compare everything before purchasing it from one specific dealer for your home or office.


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