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- Barrel and arched roofs, canopies and walkways
- Crimp-curved sheets for curved eaves and ridges
- Made from standard WS trapezoidal profiles
- Same coatings and colours as flat sheets
Curves without joints
Curved sheets turn a roof into an arch with no ridge joint – for canopies, walkways, sports halls and architectural roofs. Two methods are used:
Two ways to curve a sheet
- Roll-curved (smooth) sheets – bent to a large radius for barrel roofs; chord length up to about 1.2 m per curved piece in the reference range, longer arches assembled from several sheets.
- Crimp-curved sheets – crimped to a tight radius (minimum radius about 300 mm, minimum length about 560 mm) for curved eaves, ridges and bullnose details.
Achievable radii depend on profile, thickness and coating – confirm with our engineers before design.
Standards and requirements by market
Codes World Steel designs, fabricates and documents this product to – and the key geometric and load requirements in each market.
United States
- ASTM A653 / A792Galvanized / 55 % Al-Zn coated sheet
- ASTM A755Coil-coated (pre-painted) metallic-coated sheet
- AISI S100Cold-formed steel design
- ASTM E1592 · UL 580Wind uplift testing of roof panels
Australia / NZ
- AS 1397Metallic-coated steel sheet – G300 to G550, Z / AZ coatings
- AS/NZS 2728Pre-finished / pre-painted sheet
- AS 1562.1Design and installation of metal roof and wall cladding
- AS 4040Methods of testing sheet roof and wall cladding (incl. cyclonic)
Europe
- EN 10346Continuously hot-dip coated steel flat products
- EN 10169Organic coated (pre-painted) steel flat products
- EN 14782Self-supporting metal sheet for roofing and cladding – CE marking
- EN 1993-1-3Cold-formed members and sheeting
Summary for orientation only – the project specification, the adopted code edition and the authority having jurisdiction govern.
Finishes
| Finish | Standards / notes |
|---|---|
| Zinc-aluminium (AZ) coated | AZ100–AZ150 · AS 1397 / ASTM A792 / EN 10346 |
| Galvanized (Z) | Z180–Z275 · AS 1397 / ASTM A653 / EN 10346 |
| Pre-painted | Polyester or SMP paint system on AZ / Z substrate · AS/NZS 2728 / ASTM A755 / EN 10169 |
| Colours | Standard colour range; special colours on minimum order quantity |
Frequently asked questions
Which radius can be achieved?
Crimp-curved sheets reach a minimum radius of about 300 mm; smooth roll-curved sheets need larger radii. The exact limit depends on profile and thickness.
IAS AC472
