Coastal aluminium windows face a harder life than windows inland. Salt in the air settles on frames, holds moisture and attacks any damaged spot in the finish, while strong wind drives sand into tracks and seals. Aluminium is still one of the best frame materials for the coast, because it does not rot like timber or rust like steel. This guide explains what salt air does, how to choose coastal aluminium windows and the simple care that keeps them working.
In this guide
What the coast does to a window
- Salt deposits. Fine salt settles on every surface and attracts moisture, which keeps the frame damp.
- Finish damage. Where a frame is scratched or chipped, salt can start white, powdery corrosion on the exposed metal.
- Sand. Wind-blown sand wears the rollers on sliding windows and clogs the tracks and drainage slots.
- Wind and rain. Coastal storms push rain hard against the window, so drainage and seals matter more.
None of this rules out aluminium. It means windows near the sea need the right choices up front and a little more care.
Choosing coastal aluminium windows
Three choices matter most when you order coastal aluminium windows: the finish, the opening type and the size.
Pick the finish
Powder coat and anodising both protect the metal, provided the finish stays intact. Choose a finish you are happy to wash regularly; White shows salt marks less than Black. See aluminium window colours and anodised aluminium windows.
Think about the opening type
On an exposed sea-facing wall, top hung and side hung windows close against their seals, while sliding windows rely on brush seals and a track that collects sand. Many coastal homes use top hung or fixed windows on the windward side and sliding windows on sheltered walls. Compare them in top hung vs side hung windows and aluminium sliding windows.
Check the wind exposure
Large windows high up on an exposed site carry bigger wind loads. Talk to your builder about the site and see wind loads on aluminium windows for how size, height and exposure interact.
Caring for windows at the coast
The care routine is what keeps coastal aluminium windows working. It takes minutes a month and prevents most problems.
| Task | How often at the coast |
|---|---|
| Rinse frames with fresh water | Every month, more often on sea-facing walls |
| Wash with mild soap and water | Every two to three months |
| Vacuum tracks and clear drainage slots | Every two to three months |
| Check seals, hinges and rollers | Twice a year |
| Touch in chips or scratches | As soon as you see them |
Always rinse with clean water after washing, and never use abrasive pads or harsh solvents. Full steps are in how to clean aluminium windows.
Signs your windows at the coast need attention
- A white, powdery bloom on the frame where the finish is damaged.
- A sliding sash that drags or grinds, usually sand in the track or worn rollers.
- Water on the inside cill after rain, often blocked drainage slots.
- Stiff hinges or a top hung sash that no longer stays open.
Catch these early and coastal aluminium windows stay easy to live with. See aluminium windows leaking if water is getting in.
Glass at the coast
Every Coetz™ window uses 6.38 mm clear laminated safety glass. Laminated glass holds together if it breaks, which helps on a windy site, and it reduces outside noise from wind and waves. See laminated glass noise reduction.
How long do windows at the coast last?
With regular rinsing and the odd replacement roller, hinge or seal, coastal aluminium windows give many years of service. The frame usually outlasts the moving parts, which are designed to be replaced. Our aluminium window lifespan guide explains which parts wear first. The warranty is 5 years on frames, glass and powder coat, and 2 years on hardware and seals.
Ordering for a coastal home
Coetz™ supplies coastal aluminium windows only, so your builder or installer fits them. We deliver to coastal towns across South Africa, including Cape Town, Durban, Gqeberha and East London, or you can collect free from our Laser Park workshop. Glazing must meet SANS 10400-N, published by the South African Bureau of Standards.
Coastal aluminium windows: frequently asked questions
Do aluminium windows rust at the coast?
Aluminium does not rust like steel. Salt can cause white surface corrosion where the finish is damaged, so touch in chips early.
How often should I clean windows near the sea?
Rinse the frames with fresh water about once a month, and wash them properly every two to three months.
Which window type is best on a sea-facing wall?
Top hung and fixed windows suit exposed walls well. Sliding windows are better on sheltered walls, where less sand reaches the track.
Is anodised or powder coat better at the coast?
Both protect the metal while the finish is intact. Choose the look you prefer and keep it clean.
Do you deliver to coastal towns?
Yes. Coetz™ delivers across South Africa, including Cape Town, Durban and Gqeberha.
Coetz™, Unit 2, 84 Ridge Road, Laser Park, Johannesburg. Call 010 412 0062, WhatsApp 076 613 4418 or use our contact page.
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