![]() Design Criteria for Limit State Capacities.End span capacities given in this table are based on the end span being 2/3 of the internal span.If design requirements exceed this limit, Contact Dimond Roofing for specific advice. Loads given are limited to a maximum of 2.5kPa.Loads given are based on 2 screw fasteners/sheet/purlin (x) = one stitching screw between mid-span purlins, (y) = two stitching screws per mid-span purlin.Category 3 maximum spans are limited as a guide to achieving satisfactory appearance for wall cladding. Category 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. In any category, spans above the maximum shown should not be used.For further information, please refer to the New Zealand Metal Roof and Wall Cladding Code of Practice, Section 12.3. There are several options to reduce the oil canning effect in tray type profiles and flashings, for example, a) increasing the thickness of the material, b) using stiffening swages in wide flat elements and c) limiting flat elements to less than 150mm width. Tyvek Metal) and/or the use of backer rods under the tray. The effect can be more or less pronounced depending on differing light and sun angle conditions and the coating gloss levels.įor Solar-Rib, oil canning can be reduced by the use of 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: Oil Canning is the visible waviness in the flat areas of metal roofing and walling.
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