When it comes to keeping your roof watertight and your home protected, flashing plays a much bigger role than most people realise. It’s that thin piece of metal installed around roof edges, joints, chimneys, skylights, and other vulnerable spots that prevents water from seeping into places it shouldn’t go.
But not all flashing is made equal, and choosing the right material can have a big impact on how long your roof lasts and how well it holds up in harsh Aussie weather.
What Is Roof Flashing, and Why Does It Matter?
Flashing is used to create a watertight seal at vulnerable junctions on a roof, such as:
- Valleys where two roof surfaces meet
- Around chimneys, skylights, and vents
- Along the edges of roof sheets or tiles
- At wall junctions and parapets
Without properly installed flashing, water can sneak underneath your roofing, causing rot, mould, rust, and internal damage. It’s one of the key defences your roof has against heavy rain and stormy weather, especially important in areas where wild weather isn’t uncommon.
Common Flashing Materials in Australia
Let’s take a closer look at the two most popular materials used for roof flashing on Australian homes: Zincalume® and Colorbond® steel.
Zincalume® Flashing
Zincalume® is made from steel coated in a mix of zinc, aluminium, and silicon. It’s been widely used in Australian metal roofing for decades and is known for its strong corrosion resistance and value for money.
Pros:
- Excellent resistance to rust and corrosion
- Strong and durable over time
- More affordable than Colorbond®
- Ideal for hidden flashing areas where colour matching isn’t needed
Cons:
- Comes in a plain metallic finish only
- Not as visually appealing for exposed areas
- May not match existing Colorbond® roofs
Best for:
Hidden or internal flashings, valley gutters, under-tile applications, or budget-conscious projects.
Colorbond® Steel Flashing
Colorbond® is Zincalume® with a baked-on colour coating, available in a wide range of modern, natural, and classic colours. It’s become the go-to choice for Australian roofing thanks to its looks, performance, and longevity.
Pros:
- Huge colour range to match roofing, gutters, and walls
- UV and corrosion-resistant finish
- Long lifespan even in coastal or high-rainfall areas
- Visually seamless with other Colorbond® products
- Suitable for both visible and hidden flashings
Cons:
- Slightly more expensive than Zincalume®
- May not be necessary for non-visible areas
Best for:
Exposed flashings, fascia boards, parapets, and anywhere appearance matters. Perfect for matching a modern Colorbond® roof.
So, Which Flashing Material Should You Choose?
It depends on your roof type, location, and whether the flashing will be visible or not.
✔ Choose Zincalume® if:
- The flashing will be hidden under tiles or sheets
- You’re looking to keep costs down
- Colour matching isn’t important
✔ Choose Colorbond® if:
- The flashing will be exposed and visible from the street
- You want to match your roof, gutters, or cladding
- You live in a coastal or high-humidity area and want extra protection
- You want a sleek, consistent look across your whole roof system
At Ocean Blue, we can help you choose the right flashing material for each part of your roof, and custom-make flashings to suit your home’s exact needs.
Don’t Overlook the Flashing
Flashings might not be the most exciting part of your roof, but they’re one of the most important. Choosing the right material, whether that’s Zincalume® for affordability or Colorbond® for looks and protection, can make a real difference in how well your home stands up to the weather.
