Dimond V-Rib Roofing & Cladding

Notes

1. In any category, spans above the maximum shown should not be used. Category 1 and 2 maximum spans are based on static point load testing as a guide, and further limited by practical experience of roof performance under dynamic foot traffic loads. Category 3 maximum spans are limited as a guide to achieving satisfactory appearance for wall cladding.
2. Loads given are based on 5 screw fasteners/sheet/purlin.
3. Loads given are limited to a maximum of 4.5 kPa. If design requirements exceed this limit, contact Dimond for specific advice
4. Duraclad – Serviceability Limit State loads are not applicable to the Duraclad material, as it does not experience permanent deformation. – System must include Safety Mesh if intended for use as a Restricted-Access roof. Refer Section 2.2.1.8.
5. N/R = not recommended.
6. End span capacities given in this table are based on the end span being ⅔ of the internal span.
7. Design Criteria for Limit State Capacities
   a) Serviceability Limit State
   No deflection or permanent distortion that would cause unacceptable appearance, side lap leakage or water ponding, due to foot traffic point load, inward or outward wind loads or snow 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 V-Rib is determined from the V-Rib Limit State Load / Span Capacity Chart using the sections of the Chart appropriate to the grade and type of material, and to the category of serviceability selected from the three categories below. It is recommended that to obtain a dependable design strength capacity for the ultimate limit state, a reduction factor of ɸ = 0.8 is applied. The capacities given do not apply for cyclonic wind conditions.
   Serviceability Requirements
   While these categories are given for design guidance to meet the serviceability limit state criteria, foot traffic point load damage may still occur if there is careless placement of these point loads.

 Non-Access Roof or Wall - Walls or roofs where no foot traffic access is possible or permitted. If necessary, "No Roof Access" signs used.

 Restricted - Access Roof - Expect occasional foot traffic educated to walk only on the purlin lines, in the profile pans, or carefully across two profile ribs. Walkways installed where regular traffic is expected, and "Restricted Access" signs placed at access points.

 Unrestricted Access - Expect regular foot traffic to access the roof for maintenance work and able to walk anywhere on the roof. No congregation of foot traffic expected.