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TRIMDEK® profile: dimensions and specifications
TRIMDEK® is a five-rib trapezoidal profile. The square ribs give it more stiffness than corrugated, so it spans further between purlins and runs down to a much lower pitch.
| Effective cover width | 762mm |
| Rib height | 29mm |
| Number of ribs | 5 per sheet |
| Minimum recommended roof pitch | 2° (1 in 30) |
| Base metal thickness | .42 BMT |
| Minimum cut length | 1 metre |
| Maximum cut length | 10 metres |
| Material | Genuine BlueScope COLORBOND® steel, 22 colours |
| Also available in | .48 BMT TRIMDEK® for longer spans, higher wind regions and commercial roofs |
How many TRIMDEK® sheets do you need?
Each sheet covers 762mm once lapped. Divide the width of the roof plane in millimetres by 762 and round up, then do the same for the other plane. For the length, measure from the ridge to the outside edge of the gutter along the slope, not across the ground, and add your gutter overhang. That figure is what you enter.
At 2 degrees minimum pitch, TRIMDEK® suits skillion roofs, verandahs, patios and low-line extensions where corrugated would not drain. Span and purlin spacing depend on your wind region and the thickness you choose, so confirm those against the manufacturer's span tables or with your builder before you set out the frame.
Trimdek Roofing Sheets (COLORBOND® Steel) – Cut to Length & Delivered
Trimdek roofing sheets are a high-strength steel roofing profile designed for modern Australian homes, sheds, and commercial projects. Manufactured from genuine COLORBOND® steel, these sheets are built for long-term durability, clean lines, and reliable performance in Australian conditions.
Order Trimdek roofing sheets online, cut to your length and delivered across Victoria, New South Wales, Queensland, and Tasmania. With pricing per metre and no need to request a quote, you can order your full roof quickly and confidently.
Why Choose TRIMDEK®? A Lightweight and Economical Profile
TRIMDEK® is a versatile roof and wall cladding profile featuring bold trapezoidal ribs and subtle fluting in the pans. Its excellent spanning capacity can permit wide support spacings, subject to the selected sheet thickness, support structure and engineering details. This makes it suitable for residential buildings, sheds, garages, carports and patios.
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Strong ribbed profile for longer spans
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Modern look for residential and commercial builds
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Suitable for roofing and wall cladding applications
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Available in .42 BMT and .48 BMT COLORBOND® Trimdek options
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Manufactured from genuine BlueScope COLORBOND® steel roofing sheets
Trimdek Sheet Sizes, Dimensions & Coverage
Understanding Trimdek sheet dimensions is important when planning your roof. Each sheet is custom cut to length, helping reduce waste and minimise joins.
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Nominal cover width: 762mm
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Custom cut to your required length
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Available in multiple thicknesses (.42 and .48 BMT )
For best results, confirm all measurements in millimetres before ordering to ensure accuracy across your project, and follow installation guidelines for COLORBOND® Trimdek roofing to achieve a durable finish.
Custom Cut to Length Trimdek Sheets
All Trimdek roofing sheets, including ZINCALUME® Trimdek roof and wall sheets, are cut to your specified length, allowing for a tailored fit that aligns with your roof design. This reduces installation time, improves finish quality, and helps achieve straight, consistent roof lines from eave to ridge.
Ordering multiple lengths? Simply add each size as a separate line item to ensure your order is manufactured correctly and arrives ready for installation.
Genuine COLORBOND® Trimdek Roofing
Our Trimdek sheets are made from genuine COLORBOND® steel, designed and manufactured by BlueScope for Australian conditions, and we also offer ZINCALUME® Trimdek roofing sheets (.48 BMT) for projects that prefer a metallic finish. This ensures long-term performance, corrosion resistance, and colour consistency across your entire roof.
Popular COLORBOND® colours include Monument, Woodland Grey, Classic Cream, Night Sky, Deep Ocean, and more (availability may vary by location), while ZINCALUME® roofing sheets in Trimdek and corrugated profiles are ideal where a classic metal aesthetic is desired.
Prefer the classic wave profile instead of a trapezoidal sheet? Shop our corrugated iron roofing sheets here.
Trimdek Roofing Sheets Delivery
We deliver Trimdek roofing sheets across Australia, including:
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Trimdek roof sheets delivered Victoria (VIC)
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Trimdek roof sheets delivered New South Wales (NSW)
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Trimdek roof sheets delivered Queensland (QLD)
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Trimdek roof sheets delivered Tasmania (TAS), with compatible Turn Up/Down tools for Trimdek sheets also available for nationwide shipping
All sheets are cut to length before dispatch and delivered ready for installation. Use the postcode checker above to confirm delivery availability and timeframes for your area.
Common Uses for Trimdek Roofing
Trimdek is widely used across residential, commercial, and industrial projects due to its strength and versatility.
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Residential roofing and modern home designs
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Sheds, garages, and carports
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Commercial and industrial buildings
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Wall cladding applications
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Low-pitch roofing designs (check suitability)
For very low pitch roofs, some projects may consider alternative profiles such as Klip-Lok 700.
Complete Your Roof with Matching Accessories
For a complete and professional finish, pair your Trimdek roofing sheets with compatible accessories:
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Ridge capping and flashings
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Roofing screws and fasteners
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Gutters and fascia systems
Ordering everything together ensures compatibility and helps reduce delays on site.
Order Trimdek Roofing Sheets Online
Buying Trimdek roofing sheets online is simple. Select your profile, thickness, colour, and required lengths, then add to cart for instant pricing per metre.
With fast processing, delivery, and genuine BlueScope steel, you can order your complete roofing system in one place — no quotes required.
