![]() ![]() ![]() The capacities given do not apply for cyclone wind conditions. It is recommended that to obtain a dependable design strength capacity for the ultimate limit state, a reduction factor of Ø = 0.8 is applied. The span capacity of Heritage Tray is determined from the Heritage Tray Limit State Load/Capacity Chart using the section of the chart appropriate to grade and type of material and to the category of serviceability selected from the two categories below. No pull through of fixings or fasteners withdrawal resulting in sheet detachment due to wind up-lift (outward) loads. Design Criteria for Limit State Capacities.End span capacities given in this table are based on the end span being the same as the internal span.If design requirements exceed this limit, Contact Dimond Roofing for specific advice. Loads given are limited to a maximum of 4.7kPa. ![]() Loads given are based on 1 clip/sheet/purlin.Loads given are based on 2 screw fasteners per clip Category 3 maximum spans are limited as a guide to achieving a satisfactory appearance for wall cladding. Category 1 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.For Non-Access / Roof - Purlins are required to be at maximum 500mm spacing.There are several options to reduce the oil canning effect in tray-type profiles and flashings, for example:Ī) increasing the thickness of the material,ī) using stiffening swages in wide flat elements andĬ) limiting flat elements to less than 150mm width.įor further information, please refer to the New Zealand Metal Roof and Wall Cladding Code of Practice, Section 12.3. The effect can be more or less pronounced depending on differing light and sun angle conditions and the coating gloss levels.įor Heritage Tray, oil canning can be reduced by the vented roof underlay (e.g. Oil canning can occur during the forming and installation processes and during thermal expansion of the roof sheeting during its life cycle. It does not cause detriment to product performance. Oil canning produces an aesthetic effect inherent in standing seam tray profiles and profiles/flashings with wide flat elements. Oil Canning is the visible waviness in the flat areas of metal roofing and walling. ![]() When the profile is used as wall cladding, careful attention is required to sheet set-out and sheet width tolerances to ensure the sheet modules align to wall openings.Įxtreme wind events may cause sound reverberation on Heritage Tray pans.
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