Abstract
Failure modes resulting from the existing North-American roof certification procedures are often not consistent with failures in the field. To develop test procedures for certifying roofing systems under dynamic wind loads, the National Research Council of Canada (NRC) formed an industry-based consortium. The consortium is known as Special Interest Group for Dynamic Evaluation of Roofing Systems (SIGDERS) . Using wind tunnel pressure records as source data, SIGDERS developed a dynamic load cycle. With input from industries, building owners and roofing associations, the developed load cycle has been generalized. Based on this extensive investigation, a simplified laboratory test procedure is proposed for the evaluation of mechanically fastened single-ply roofing system.
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