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 carports costs about one and a half times as much but never rusts at all, which is why it is specified most on the closest-to-the-sea stands. For the budget end, a shade net carports trades the solid roof for price. Full figures are on the carport prices in Durban page.
Common questions
Do steel carports rust in Durban?
Yes, if the frame is painted mild steel — it 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 holds up and costs less.