Galvanized Steel Stairs near the Coast? (Read this)

Will it rust?

Yes. If you live near the beach (150m or less), “Hot-Dip Galvanized” is not enough. Contractors will tell you: “Sir, it lasts 50 years!” In Manila? Maybe. In a coastal area? It lasts 5 years before it looks like a rusty shipwreck.

The “Micro-Climate” Trap

You think your roof deck is safe because it has a roof? Wrong. Salt sticks to the metal. Humidity keeps it wet. If rain doesn’t wash the salt off… it eats the zinc. Your covered stairs might rust faster than the exposed ones.

The Truth about Materials

1. Galvanized (Standard) Good for inland. Bad for beach. Expect rust in 3-5 years.

2. Duplex System (Galvanized + Marine Paint) This is the cheat code. You galvanize it FIRST. Then you paint it with Epoxy + Polyurethane (Marine grade, like Jotun or Hempel). Lasts 15-20 years. Expensive? Yes. Cheaper than replacing the whole stair in 5 years? Also yes.

3. Stainless Steel (304 vs 316) 304 is “standard stainless”. It will get tea-stains (brown spots) near the sea. 316 is “marine grade”. This is what you want. If you can afford 316… buy 316.

4. The Hardware (Screws/Bolts) Do NOT use galvanized bolts. They rust first. Use 316 Stainless Steel bolts. Always. Even if the structure is galvanized, the bolts must be stainless.

Maintenance (The annoying part)

You have to wash it. Fresh water. Hose it down once a month. Remove the salt. If you don’t wash it, it doesn’t matter what you paid for. Nature always wins.