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Selecting the Right Size of Purlin · A four-inch purlin can span 12 feet · A six-inch purlin can span 18 feet · An eight-inch purlin can span 25 feet · A ten-inch Zed Purlins Systems page 5 Minimum number of spans is 2 and the maximum span is Sag system recommendations for various roof conditions are. The tables include a comprehensive range of span configurations from simple spans to continuous, lapped and combined spans. In addition, the Z and C sections Continuous spans have less deflection than single spans. C sections cannot be lapped. Z sections are manufactured with one broad flange and one narrow flange so With regard to wall heights and girt spans, please contact. METALFORM® for guidance. Cladding fastened to this flange. Lap. Rafter or steel frame. Bolt in webHow far can a 150mm C purlin span:- as general guidelines and rules, different gradation and weight, a 150mm (6″) thick C purlin can allow span upto 5.5m to 8.7 Purlin and girt installation should be carried out in suitable weather conditions by experienced crews. SAFE WORK PRACTICE. Metroll purlins and girts are not