Dimondclad Rib 20 - Detailed Cladding Design
Design Criteria for Limit State Capacities
a) Serviceability Limit State
No deflection or permanent distortion that would cause unacceptable appearance or side lap leakage due to inward or outward wind loads.
b) Ultimate Limit State
No pull through of fixings or fastener withdrawal resulting in sheet detachment due to wind up-lift (outward) loads.
System Design
The span capacity of Dimondclad Rib 20 and Dimondclad Rib 50 is determined by the serviceability requirement for acceptable appearance and should not exceed 1400mm.
The ultimate windload should not exceed 3 kPa.
The Dimondclad Rib 20 and Dimondclad Rib 50 profiles are not intended for use as roofing products, and must not be used in situations where foot traffic point loads can be applied.
Fastener Design
Dimondclad Rib 20 should be screw fixed to either timber or steel framing where a high level of appearance is required. The use of the appropriate length of M6 screw will ensure failure by fastener pull out will not occur under the load limitation given.
| Framing | Wall Cladding Pan - Screw Length*(mm) | Wall Cladding Pan - Designation |
| Timber | 50 | Roofzip M6 x 50mm |
| Steel | 20 | Tek - 12 - 14 x 20 |
* If sarking or insulation is used over the framing, screw length will need to be increased.
For screw size range and fastener / washer assembly refer Section 2.2.3.1 of the Dimond Roofing & Cladding Technical Manual
The Span Capability and Sheet Appearance is based on fasteners at 260mm maximum spacing across the sheet without the use of load spreading washers.
Spans greater than 800mm will require the specifi cation and use of side lap stitching fasteners.
Dimondclad Rib 20 Fastener Layout Options
