Why can USGs IBC seismic design categories D, E, and F alternate construction methods carry more weight than competing systems?
Seismic testing typically focuses on the suspension system, without minimum weight requirements for ceiling panels and no requirement to include components such as light fixtures and air handling equipment. On the job, however, the suspension system must support and carry the weight of a fully functional ceiling, including ceiling panels that can weigh up to 2 lb./sq. ft. or more. For this reason, USG tested suspension systems with light fixtures, air handing equipment, and a wide range of USG ceiling panels. This full-scale testing certifies that USG IBC-compliant assemblies accommodate loads 39% heavier than those claimed by competing systems. As demonstrated by these superior test results, no other suspension system can match the tightness and seismic performance of USG suspension systems.
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