Salt air is a measurable gradient
Airborne chloride from ocean surf is what pits fittings and lifts finishes, and it falls off with distance from the waterline. Australia's atmospheric corrosivity standard, AS 4312, grades environments from C1 (dry indoors) to C5 (ocean-surf marine), and the technical guidance around it notes that surf-generated chloride does not normally carry much beyond a kilometre inland, with exceptions where flat terrain and onshore winds push it further. Newcastle's east-facing surf suburbs and its harbour spit are the textbook case.
You don't need the standard to see it. Walk from the baths up through Merewether and read the door hardware: pitted at the front row, dull two streets back, ordinary by the highway. That gradient is what we spec against.
The three bands, and their verdicts
| Band | Feels like | Outdoor verdict | Indoor verdict |
|---|---|---|---|
| Salt band (~0–2 km) | Merewether, Bar Beach, Stockton, Newcastle East | Powder-coated aluminium, stainless pivots, marine-grade fixings, no exceptions | PVC, aluminium-reinforced louvres on wide blades |
| Middle band (~2–5 km) | Hamilton, Cooks Hill, New Lambton | Aluminium still preferred outside; hardware spec matters more than blade material | Basswood or PVC on merit, room by room |
| Inland | Fletcher, Cameron Park, Wallsend | Aluminium for weather, not for salt | Basswood freely; PVC in wet areas as everywhere |
Bands are working guidance, not a site assessment; a headland street cops more than a sheltered one at the same distance. The measure visit reads your actual exposure.
Why each material earns its band
Powder-coated aluminium wears a baked-on polymer skin with no brush edge for salt to lift, over a metal that cannot rot or swell. Pair it with stainless pivots, because the fittings, not the blades, are where coastal shutters actually fail first.
PVC with an aluminium core is the indoor answer near the water: the polymer ignores humidity, and the aluminium stiffening keeps wide blades straight through humid summers. Painted white, it reads identically to timber from conversation distance.
Basswood is the joinery timber shutters are meant to be made of, and away from the salt it is the warmest, most paintable choice in the range. We simply refuse to fit it where the coast will spend two years proving us wrong.
The habit that keeps coastal shutters young
A fresh-water rinse, four times a year. That's the entire coastal maintenance program.
Salt does its damage sitting on a surface. Hose the blades and hardware with fresh water, front-row homes more often, and the finish stays bright for years. The full routine, all materials, lives in the care guide.
References
- AS 4312 atmospheric corrosivity assessment, Industrial Galvanizers Specifiers Manual (steel.org.au): the corrosivity zone table (C1–C5) and the surf-chloride distance guidance this page summarises.
Not sure which band your street sits in? The window schedule asks one distance question and adjusts every verdict, or just tell us the suburb at your free measure and we'll read the street ourselves.
Free in-home measure & quote
Every window is bespoke. The quote starts at your place, not ours.
A specialist measures each opening, talks through material, louvre width and tilt for your rooms and your exposure, and leaves you a written quote. Nothing is made until the figures are checked on site.
Form only. We reply to arrange a time that suits.