Abstract
The effects of wind on roofing systems are dynamic, because of wind's fluctuation in time and space. Therefore, a dynamic means of evaluating roofing systems is beneficial in identifying the component of the system that has the weakest resistance against wind uplift forces. The Special Interest Group for Dynamic Evaluation of Roofing Systems (SIGDERS) has commissioned a unique North American facility, which has been used to evaluate a mechanically fastened thermoplastic membrane roof system under three different test methods: the Factory Mutual FM-4470 static test standard, the European Union of Agreement (UEAtc) procedure, and the SIGDERS-developed dynamic load cycle. Comparison of the data from these tests shows that UEAtc and SIGDERS tests produce failure modes similar to those observed in the field. The SIGDERS load cycle is completed in much less time than the UEAtc procedure.
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