- Aluminium resists corrosion, doesn’t rot, rust or warp, and can last 50 years or more in coastal conditions.
- Its strength to bulk ratio means slim frames and more glass, which suits exposed sites where wind loads are high.
- Modern powder coatings mean aluminium is no longer limited to grey, with black, green, blue, beige and even red all available.
- Thermal breaking solves the old heat transfer criticism by inserting an insulating polyamide layer inside the frame.
- For salt air locations, the combination of a marine grade finish, quality hardware and good drainage matters as much as the frame material itself.
Double glazed windows and doors tend to go in waves of fashion that are also quite area specific. That means in a certain area you’ll notice that everybody seems to have aluminium, and that is increasingly true in coastal locations such as Sydney. You might get the odd traditionalist persevering with timber, but that is really a kind of romantic notion.
The truth is that wooden window frames were long ago exposed as not being up to the job in terms of longevity without ongoing maintenance. So you can either accept that windows have a shorter service life, or you can get real and use a material that will withstand the ravages of the weather and stand the test of time.
Aluminium was the new kid on the block a few decades ago, before being supplanted by uPVC, but it has now staged a major revival. Partly that’s because the product has been improved, and partly because its image has changed. Aluminium is now regarded as stylish, and so it should be.
But what makes it ideal for Sydney and other coastal areas? Practicality. It does the job. Aluminium doesn’t rot like wood does. It resists corrosion and can last as much as 50 years or even longer. It doesn’t rust or warp, either.
What Does Salt Air Actually Do to a Window?
Salt air corrosion is the gradual degradation of a material caused by airborne chloride particles carried inland from the ocean. Those particles settle on surfaces, attract moisture and accelerate oxidation, which is why coastal homes see faster deterioration of untreated metals, fixings and finishes than inland homes do. Aluminium forms a protective oxide layer naturally, and a quality powder coat or anodised finish adds a further barrier on top of that.
Style and Substance Together at Last
Perhaps the most important of aluminium’s advantages is its strength to bulk ratio. A well made aluminium window frame is both sleek and strong: it has an innate strength that belies its slim appearance. The old assumption that bigger meant stronger simply isn’t true, and to use a boxing metaphor, aluminium punches above its weight in this respect.
What you need in a window is maximum glass and minimum frame. Windows are for looking through and for letting the light in, so you don’t need bulky frames spoiling the picture. Aluminium gives you the strength you need to stand up to the wind that coastal areas inevitably have at times, but it just does its job and stays out of the way.
That structural strength is what allows larger openings, taller sashes and wider sliding panels than other frame materials can comfortably carry. Our aluminium window systems cover everything from compact openings to large format glazing.
Aluminium Windows Look Great, Not Metallic
If you’re struggling with the idea that aluminium is metal, and that metal looks right on planes and industrial walls but not homes, you clearly haven’t seen an aluminium frame recently. Or perhaps you have, but didn’t know that’s what it was.
With modern powder coatings the old cliché of boring grey just doesn’t apply anymore. You can have black, you can have green, or blue or beige, or even red.
That might sound like a step too far, but architects are now using bold, bright red to add style and distinction to buildings. If you’re the type who likes to dress subtly in smart dark suits, you may want the same to apply to your building. But a strong, vibrant colour on a window frame can look striking yet perfectly appropriate.
The Temperature Transfer Solution
Then there is the old criticism that’s thrown at aluminium: that it’s a metal, and metals in general conduct temperature easily, so the heat outside creeps in and so does the cold.
But there is a concept called thermal breaking, which means using a layer of an artificial material such as polyamide, otherwise known as nylon, between the inner and outer aluminium sections to stop temperature transfer in its tracks. So that’s another reservation out the window.
A thermally broken frame is one where the inside and outside metal sections are physically separated by a low conductivity insulating strip, so heat cannot travel straight through the frame. It is the single biggest factor in how a modern aluminium window performs, and it is why frames such as our MB86SI thermally broken system behave very differently to the plain aluminium frames of decades past. The Australian Government’s Your Home guide to glazing is a useful independent reference if you want to compare performance figures before you commit.
Aluminium vs uPVC vs Timber in Coastal Conditions
| Consideration | Aluminium | uPVC | Timber |
|---|---|---|---|
| Salt air resistance | Excellent with a quality powder coat or anodised finish | Very good, does not corrode | Vulnerable without diligent, ongoing re-coating |
| Frame slimness | Slimmest sightlines for the same span | Bulkier profiles, especially on large openings | Varies, larger sections needed for big spans |
| Wind load capacity | Highest, well suited to exposed sites | Good, may need steel reinforcement on large units | Good, but section sizes grow quickly |
| Maintenance | Low, rinse and clean | Low, rinse and clean | Regular cleaning plus periodic re-coating |
| Typical lifespan | 50 years or more | Around 20 to 30 years | Long with excellent care, short without it |
uPVC is a genuinely strong performer near the coast too, and for many Sydney homes it comes down to budget and the look you want. If you’re weighing the two up, it’s worth comparing against our uPVC windows for Sydney homes before you decide.
What to Specify for a Coastal Sydney Home
- A thermally broken frame, so you get the durability of metal without the heat transfer.
- A marine appropriate powder coat or anodised finish, matched to your distance from the water.
- Stainless or corrosion resistant hardware and fixings, since fittings often fail before frames do.
- Drainage that actually drains, with clear weep holes and correctly detailed sills.
- Glazing chosen for the exposure, including toughened or laminated glass where wind load or safety requires it.
Come for the Durability, Stay for the Look
Let’s say that the most important quality in a window frame is that it works well and remains in good condition. Obviously that is true, and with aluminium window frames you have those things. Now think about how it can add character to your home. It shrugs off the sea spray and the storms, but it looks great at the same time.
If you’re planning a replacement or a new build near the water, our team can talk you through the finishes and systems that suit your exposure. Take a look at what we do for homes across Sydney, or request a quote with your window schedule and we’ll come back with options.
Frequently Asked Questions
Are aluminium windows corrosion resistant in salt air?
Yes. Aluminium does not rust, and it forms a natural protective oxide layer. In coastal areas the finish is what does the heavy lifting, so specify a powder coat or anodised finish rated for marine exposure, along with corrosion resistant hardware and fixings.
Aluminium or uPVC windows for coastal areas: which is better?
Both resist salt air well. Aluminium is the better choice where you want slim frames, large openings or high wind load capacity, and it typically lasts longer. uPVC is usually more affordable and naturally insulating, but the profiles are bulkier and the service life shorter.
How long do aluminium windows last in a coastal location?
Aluminium windows can last 50 years or more. Regular rinsing with fresh water to remove salt build up, and keeping drainage channels clear, will help the frames and finishes reach the upper end of that range.
Do aluminium windows get too hot or too cold?
Plain aluminium conducts heat readily, which was a fair criticism of older frames. Thermally broken aluminium places an insulating polyamide strip between the inner and outer sections, which stops that transfer and brings performance into line with other modern frame materials.
