Thickness is where roofing margin is made or lost. One ton of thinner coil covers more roof — but go too thin and sheets dent, walk poorly and lose customers. Here is how the three most-ordered gauges compare.
Coverage per Ton (1000mm width, before profiling)
| Thickness (BMT) | m2 per Ton | Typical Positioning |
|---|---|---|
| 0.35mm | ~364 | Economy roofing, G550 full hard essential |
| 0.40mm | ~318 | The volume standard in most export markets |
| 0.45mm | ~283 | Quality tier, project and government work |
Regional Preferences We See
- East & West Africa: 0.30-0.40mm dominates; G550 stiffness compensates thinness.
- Middle East: 0.40-0.50mm; projects often specify 0.45mm+ with SMP/PVDF paint for heat and UV.
- Latin America: 0.35-0.43mm; Chile and Peru trend thicker for wind zones.
Spec Advice
Below 0.40mm, always order full-hard (G550) base — soft grade at 0.35mm feels flimsy and generates complaints. And fix BMT vs TCT in writing: at these gauges the difference is a full commercial tier.
FAQ
Can one container mix thicknesses?
Yes — most stock orders mix 2-4 thicknesses and several RAL colors, MOQ 25 tons total. See RAL color options.
What tolerance should I accept?
Related Products from ChinaCNU Steel
±0.02mm on BMT is a normal commercial tolerance for roofing gauges.