Cape Town’s coastal air is beautiful to live in, but it’s tough on metal. If you want to know how to maintain steel and aluminium structures in a coastal climate, understanding why salt air causes damage — and how to prevent it — will save you money and extend the life of your gates, fences, staircases, and structures.
Why Coastal Air Damages Metal Faster
Salt-laden sea air accelerates corrosion by breaking down protective coatings and attacking bare metal directly. Properties closer to the coast experience faster rust and pitting on untreated or poorly maintained steel, while aluminium generally resists corrosion better but isn’t completely immune, especially at joints and fixings.
Steel Maintenance Tips
- Inspect regularly — check for surface rust, especially at welded joints, fixing points, and areas where paint or coating has chipped.
- Touch up coating promptly — small chips in paint or powder coating should be repaired quickly before rust spreads underneath.
- Rinse periodically — washing off salt deposits, especially after storms, reduces the buildup that accelerates corrosion.
- Choose galvanised or powder-coated finishes — these provide significantly better long-term protection than bare or painted-only steel.
Aluminium Maintenance Tips
- Clean regularly — rinse off salt residue and grime with fresh water and mild soap.
- Check moving parts — hinges, tracks, and locks on doors and gates should be lubricated periodically to prevent seizing.
- Inspect seals — weatherstripping and seals around doors and windows should be checked for wear.
When to Call a Professional
If you notice significant rust, structural weakening, or a gate or structure that’s become difficult to operate, it’s worth getting a professional assessment before small issues become expensive repairs. Left unchecked, corrosion can compromise the structural integrity of gates, staircases, and balustrades.
Why Choose Supar Steel
Supar Steel builds and repairs steel and aluminium structures across Cape Town with coastal conditions in mind, using appropriate finishes and materials for long-term durability. See our full range of welding and fabrication services, or get a free quote for a repair or maintenance assessment.
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Frequently Asked Questions
How often should coastal steel structures be inspected?
A visual inspection every few months, with a more thorough check at least once a year, helps catch corrosion early before it becomes a structural issue.
Is galvanised steel worth the extra cost near the coast?
Yes — galvanising provides significantly better long-term corrosion protection than paint alone, which usually justifies the added upfront cost for coastal properties.
Can rusted steel structures be repaired instead of replaced?
In many cases, yes — surface rust can be treated and repainted, and structurally sound steel can often be repaired rather than fully replaced, depending on the extent of the damage.
Corrosion in coastal environments is a well-studied engineering challenge — you can read more on Wikipedia’s corrosion overview.
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