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ZINCALUME® .48bmt Trimdek Sheets: Durable, Economical, and Perfect for Low-Pitched Roofs

Quick Product Overview

  • Order Online: ZINCALUME .48bmt TRIMDEK Roofing and walling sheets

  • Applications: Ideal for roof pitches ≥2°. Suitable for roofing, wall cladding, and more.

  • Benefits: Economical, long-spanning, high strength, and lightweight.

Technical Specifications

  • Sheet Coverage: 762mm effective width; 820mm actual sheet width.
  • Material Thickness: 0.48 BMT, offering more durability than the standard 0.42 BMT.
  • Dimension Tolerances: Length: +0mm, –15mm; Width: +4mm, –4mm. (Consider thermal expansion/contraction for long roofs.)

Delivery Details

  • Time Frame: Approximately 4 - 6 working days, varies by location.

Installation Essentials

  • Fasteners for Timber Battens: 12 gauge x 65mm Type 17 Hex Head screw.
  • Fasteners for Steel Purlins: 12 gauge x 55mm Steel Fix Hex Head screw.
  • Wall Cladding Fasteners for Timber: 12 gauge x 25mm Type 17 Hex Head.
  • Wall Cladding Fasteners for Steel: 10 gauge x 16mm Steel Fix Hex Head screw.

Gutter Overlap Guidance

  • Standard Overlap: Allow a 50mm overlap into gutters.
  • Weather Adjustments: For pitches <25° or extreme weather, use the Trimdek Tool to turn sheet pans up or down as needed.

Quality Assurance

  • Made With 100% Australian BlueScope Steel – synonymous with COLORBOND® and ZINCALUME®.
  • Peace of Mind: Performance-tested, BlueScope warranty-backed, totally reliable.

Shop with Confidence

Order your ZINCALUME® Trimdek with the assurance of Australian-made quality


Maximum Support Spacings (MM) for Zincalume Trimdek Sheets
Support Type Span 0.42mm BMT 0.48mm BMT
Roofs Single span 1100mm 1600mm
End span 1300mm 1850mm
Internal span 1900mm 2600mm
Unstiffened overhang 150mm 200mm
Stiffened overhang 300mm 350mm
Walls Single span 2400mm 2700mm
End span 3000mm 3000mm
Internal span 3000mm 3000mm
Overhang 150mm 200mm
Note: Data for roofs are based on foot traffic loading. For walls, data are based on wind pressure. Table data are based on supports of 1mm BMT. 

Why .48 BMT Trimdek Zincalume Roof Sheets Are a Game-Changer for Your Roof

Are you on the fence about which roofing material to pick for your next project? Let's chat about why .48 BMT Trimdek Zincalume roof sheets are not just another option but a game-changer for your home.

Understanding Spanning: What's the Big Deal?

First off, "spanning" might sound like jargon, but it's actually pretty straightforward. It's all about how far a roofing sheet can stretch between supports. Think of it as the sheet's ability to do a 'roofing split' – the better its spanning capacity, the fewer supports you'll need. This isn't just a technical win; it's a cost-saver and a design dream come true.

.48 BMT vs. .42 BMT: The Showdown

When we pit .48 BMT against .42 BMT Zincalume sheets, the difference in spanning capabilities is stark. With .48 BMT, roofs can enjoy a single-span reach of up to 1600mm. That's a lot more room compared to the 1100mm offered by .42 BMT. This trend continues across various types of spans – from end spans to overhangs. And it's not just roofs; even walls benefit with the .48 BMT offering a single span of up to 2700mm.

Why This Matters to You

So, why should you care? Here are a few good reasons:

  • Less Need for Support: Fewer supports mean fewer materials and labour costs. It's a win-win for your wallet and your construction timeline.
  • Design Freedom: With more spanning capability, architects and builders get a bigger canvas for their creativity. Dreaming of wide, open spaces under a seamless roof? .48 BMT makes it possible.
  • Built to Last: Thicker and tougher, .48 BMT sheets stand up better to the elements. Whether it’s a windy day or a heavy downpour, your roof has you covered—quite literally.

Making It Easy to Choose

Choosing between .42 BMT and .48 BMT shouldn't be a headache. With the right info, it's clear that .48 BMT Trimdek Zincalume sheets offer more bang for your buck. And if you're wondering where to start, Metal Roofing Online is your go-to. They've got the expertise, the range, and the support to make your roofing project a breeze.

Picture This!

Imagine your home sporting a sleek, durable .48 BMT Trimdek Zincalume roof. It's not just about protection; it's about style, efficiency, and peace of mind.

In a nutshell, .48 BMT Trimdek Zincalume roof sheets are more than just a choice; they're a smart investment in your home's future. With their superior spanning capabilities, cost efficiency, and design flexibility, they tick all the boxes for homeowners looking to make a lasting upgrade. And with Metal Roofing Online, ordering your roof has never been easier.


The National Construction Code (NCC) sets the compulsory performance standards for the design and construction of buildings in Australia. Adhering to these standards is critical, not just for the integrity and safety of a structure, but also to avoid the significant costs associated with non-compliance.

The LYSAGHT® Trimdek Zincalume .48 sheets embodies the essence of Australian manufacturing excellence. Each product is rigorously tested and certified to meet, if not exceed, the NCC's requirements. Our compliance bulletins provide clear evidence of this alignment for residential and commercial projects. Choosing Trimdek Roofing and Walling means choosing confidence in the compliance and quality of your building materials.

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