![]() ![]() Avoid using abrasive discs as they can cause burred edges and coating damage. CGI is best cut using tin snips, but for larger cuts it may be necessary to use a power saw with a steel cutting blade or a power nibbler. Use a coloured pencil for marking steel, as lead or black pencils contain graphite which promotes rusting. Ensure your hands or gloves are clean, especially when handling zinc/al which can mark. Handling and Cutting of CGIįor safety, wear gloves when handling CGI. Fixings such as rivets and self-drilling screws must be compatible with the material they are fixing. Galvanised steel and pure zinc material can be used with zinc/al, but you must avoid water run-off from zinc/al onto galvanised material. Zinc/al and pre-painted steel cannot be used with lead, copper and monel. The best way of reducing corrosion is to keep incompatible metals apart. Check with Stratco before using in these areas. Concrete should not be poured against zinc/al. It is important that dirt, soil, compost, paving sand, or other materials which retain moisture are not placed against steel sheeting. Zinc/al and pre-painted steel should not be used in aggressive areas such as near swimming pools and spas. While roofing materials in outer urban and rural areas may have a life-span in excess of 30 years, this can reduce to only a few years in coastal and industrial environments. Stratco CGI will have a long, useful life if used according to Stratco specifications. *When fixing to 0.55mm thick roof battens crest fix with M6 x 50mm TS self drilling screws with neoprene washers. Contact Stratco if further advice is required.ġ0 x 25mm Type 17 hex head screw with neoprene washer If roof penetrations exist, the total roof run will generally be greater than the distance from ridge to eaves at the location the penetration interferes with the runoff. The peak rainfall intensities shown represent a 100 year average recurrence interval (ARI) for a five minute rainfall duration. Hence, values limited to 20 degree roof pitch. *Note: Roof pitch >20 degree requires other means of verification. Water Carrying Capacity Maximum Roof Run For Drainage (m) The values are for use with steel supports with a minimum thickness of 0.75mm, G550. Wind Capacities Wind Capacities (kPa) - Three Fasteners Domestic Carport / Patio Spans Domestic Carport / Verandah Spans (mm) Spans are based on three fasteners per sheet, per support. Walling spans are based on N1 (W28) wind loading. Roofing spans are limited, based on typical maintenance foot traffic. Maximum Recommended Spans Maximum Recommended Spans (mm) Region A, Category 2 - Region B, Category 2.5 Region A, Category 2.5 - Region B, Category 3 Region & Category (Commercial / Industrial) To read the span tables for commercial and industrial applications, select the region and category for the area, then convert it to the correct classification using the table below. Wind Load Conversionįor domestic applications use the appropriate wind classification for the area. Stratco can provide additional engineering advice if any design parameters vary from those above. Loads on supporting purlins may limit these spans. Spans are based on Cpn=-0.9 and Kl=1.5 applied over the entire span, and are suitable for all span types. The carport and verandah spans only apply to structures not enclosed by peripheral walls. The following shielding factors have been used for each of the terrain categories: Category 3 = 0.85, Category 2.5 = 0.95, and Category 2 = 1. Roof spans allow for loads incidental to maintenance.Īll pressures have been determined assuming the wind loading in any direction is not affected by topography. A local pressure factor, Kl=2.0 has been used for all roofing and walling spans for both strength and serviceability limit states. Roofing calculations are based on Cpe=-0.9 and Cpi=0.2, walling is based on Cpe=-0.65 and Cpi=0.2. For commercial and industrial applications, tables are based on a maximum overall height of ten metres and a 500 year design return period. For domestic applications, the pressures and spans are based on a maximum: eaves height of six metres, roof pitch of 35 degrees and total roof height of 8.5 metres. Spans are determined by wind speeds for non-cyclonic areas. Capacity tables are in limit state format. Span tables have been developed by determining wind pressures in accordance with AS4055-2006 for domestic applications and AS/NZS 1170.2:2002 for all other applications. The Wind Capacity Tables are based on testing in accordance with AS1562.1-1992 and AS4040.0, 1 and 2-1992. Material Specifications Material Properties ![]()
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