If you're choosing an external spiral staircase kit, you've probably come across the term hot-dipped galvanised steel. But what does it actually mean, and why does it matter?
What is hot-dipped galvanising?
Hot-dipped galvanising is the process of submerging steel in molten zinc at around 850°C. At that temperature, the zinc chemically bonds with the steel, becoming part of the material itself — not just a coating sitting on the surface.
How is that different from zinc-coated steel?
Zinc coating uses an electrical current to deposit a much thinner layer of zinc onto the steel surface. It's fine for indoor use, but in outdoor conditions - exposed to rain, temperature changes, and moisture - it won't hold up in the same way. Hot-dip galvanised coatings can be up to ten times thicker, which means significantly better corrosion resistance and a much longer lifespan with little to no maintenance required.
What does this mean for your QStairs kit?
All external QStairs staircases - whether galvanised or powder-coated - are hot-dip galvanised as standard. This ensures every component is fully protected before it leaves us, so you can be confident your staircase will stand up to the elements for years to come.
Wondering how long it will last in your area? The Galvanizers Association has a handy corrosion map that gives average lifespans across the UK.
Internal powder-coated stairs don't require hot-dipping as they aren't exposed to outdoor conditions - so you're only getting what you actually need.
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The team are happy to answer any further questions you might have about the process so feel free to get in touch.