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Hot-dip galvanised vs sprayed steel
Two corrosion protections that look similar in a quote and differ at year eight.
| Hot-dip galvanised | Sprayed coating | |
|---|---|---|
| Coverage | Inside and outside, including welded joints | Surface only; joints and hollow sections are weak points |
| Coating thickness | Typically 60–85 μm or more, measured | Thinner and harder to verify |
| Site repair | Local touch-up after cutting and welding | Repair needs re-coating |
| Humidity and salt | Suitable for coastal and humid sites | Not recommended where humidity is high year-round |
| Cost | Higher | Lower |
For a house that will see twenty years of humidity, hot-dip is the specification. Sprayed steel belongs in dry, low-corrosion sites and in temporary structures.
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