Why galvanising is non-negotiable on the Durban coast
Salt air is what kills a steel carport in Durban. Airborne salt sits on bare or painted mild steel and rusts it from the weld lines outward, often within a season or two close to the sea — the reason cheap painted carports streak orange along the coast. Hot-dip galvanising answers it: the steel is dipped in molten zinc that bonds to every surface, inside the tube included, forming a barrier the salt has to eat through the zinc to reach. That is why hot-dip galvanised steel is the Durban standard, not a paint finish.
Hot-dip galvanised, pre-galv or painted — the frame choice
| Frame | Protection | Life near the sea |
|---|---|---|
| Hot-dip galvanised | Thick zinc coat, inside and out | Decades — the coastal standard |
| Pre-galvanised (light) | Thin mill zinc, cut ends exposed | Years — inland or well set-back only |
| Painted mild steel | Paint only, rusts at welds | A season or two — avoid near the sea |
All three look similar on quote day; only the hot-dip frame survives a sea-facing stand. The full corrosion comparison, including aluminium, is in coastal corrosion and wind.
Galvanised steel or aluminium?
Galvanised steel is stronger for the price and, hot-dipped, lasts decades even on the coast; an aluminium carport costs about one and a half times as much but never rusts at all, which is why it is the favourite on the closest-to-the-sea stands. For the budget end, a shade net carport trades the solid roof for price. Full figures are on the carport prices in Durban page.
Common questions
Do steel carports rust in Durban?
A painted mild-steel carport rusts fast in Durban's salt air, often within a season or two near the sea. A hot-dip galvanised steel carport does not — the molten-zinc coat seals the whole frame inside and out, which is why galvanising is the coastal standard here.
What is hot-dip galvanising on a carport?
Hot-dip galvanising is dipping the finished steel frame in molten zinc so a thick coat bonds to every surface, inside the tubes included. On the Durban coast it is what stops the salt air rusting the frame, unlike a paint finish that fails at the welds.
Is galvanised steel or aluminium better near the sea?
Both resist coastal corrosion: hot-dip galvanised steel is stronger and better value, while aluminium never rusts at all. On a sea-facing north-coast stand aluminium is often chosen to remove the corrosion risk entirely; further back, galvanised steel is ample and cheaper.