This table is a quick reference guide on span and curvature limitations for all Dimond roofing and wall cladding profiles. For detailed Serviceability and Ultimate Limit State design, please refer to Section 2.1.4 – Specific Design by Profile Performance in the Dimond Roofing & Cladding Technical Manual.
Basis to the tables:
Roofing – the spans are for roofs with restricted access or where the ultimate wind load does not exceed 1.5kPa. A restricted access roof is where there is occasional foot traffic, that is educated to walk on the purlin lines, in the profile pans, or carefully across two profile ribs. Walkways will be installed where regular traffic is expected and “Restricted Access” signs placed at access points.
Walls – spans are limited by acceptable appearance or an ultimate wind load of 2kPa.
Roofing fasteners – average of 4 screw fasteners per sheet per purlin. Based on Hex-head screws without washers. The number of fasteners can be reduced by specific design.
Drape curve – radii are limited by acceptable roof appearance.
Crimp and roll curve – radii are limited by machine capabilities.
Overhang – for restricted access roofs. The unsupported area is not intended to be used as an access way.
Profile Span & Curvature Quick Guide Table
| Product | Material | Thickness BMT (mm) | Roofing Max. Span End Span (m)* | Roofing Max. Span Internal (m)* | Walls Max. Span End Span (m) | Walls Max. Span Internal (m) | Max. Radius for Drape curve (m) | Min. Radius for Crimp or Roll Curve (mm) | Max. Overhang Unsupported (mm) |
| V-Rib (min pitch 4°) | Steel (G550) | 0.4 0.55 |
1.2 1.7 |
1.8 2.5 |
1.9 2.3 |
2.9 3.5 |
20 16 |
400 400 |
200 300 |
| V-Rib (min pitch 4°) | Aluminium H36 | 0.7 0.9 |
0.9 1.4 |
1.2 2.1 |
1.6 1.9 |
2.4 2.9 |
20 16 |
N/A N/A |
150 250 |
| V-Rib (min pitch 4°) | Duraclad | 1.7 | 0.8 | 1.2 | 0.9 | 1.4 | 20 | N/A | 150 |
* Restricted Access Roofing
N/A = not available
N/R = not recommended
** Roll curve only
Refer each profile for manufacturing locations
