In landscape and building facade (curtain wall) projects, the selection of weathering steel thickness (such as national standard Q355GNH or SPA-H) is a critical technical parameter. It directly affects structural wind-resistance safety, the visual flatness of the building, runoff-resistant durability, and overall construction cost.
According to current Chinese standards for corten metal curtain walls, and taking into account different geographic environments and owner requirements, the thickness of weathering steel curtain walls must be carefully considered.
When selecting a weathering steel curtain wall ), structural safety and facade flatness are the primary considerations.
Tight-joint flat panels: Standard thickness is recommended to be ≥ 3.0 mm, with reinforcing ribs on the back (spacing ≤ 600 mm) to prevent bulging or wave deformation under wind pressure.
Corten Corrugated panels: Thanks to the geometric stiffness of the corrugation, a base thickness of 0.8–1.5 mm is typically sufficient, allowing large panel spans while significantly reducing steel usage.
Environmental Adjustment for Corten Steel Thickness
To ensure a service life of over 50 years, an appropriate "corrosion allowance" should be added based on local climate conditions:
| Environment | Recommended Thickness | Reasoning |
|---|---|---|
| Coastal areas with strong salt spray (within 1–3 km of the sea) | ≥ 4.0 mm | Chloride in the air can damage the protective patina; extra thickness acts as a safety buffer. |
| Rural, mountainous, or high-humidity areas | ≥ 6.0 mm | Formation of the protective rust layer depends on alternating wet/dry cycles; constant high humidity slows stabilization. |
| Water features or direct soil contact (landscape wall nodes) | ≥ 8.0 mm | Critical nodes in consistently wet or acidic soil environments require extra thickness to ensure long-term durability. |
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