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Working on a load bearing steel stud (6") dormitory, R-2 occupancy in Mississippi. Required in Chapter 12 of IBC 2012 to provide minimum STC rating of 50 between the dorm rooms and between dorm rooms and corridors. The walls are required to be 30 minute rated due to building being fully sprinklered. Currently showing in plan 6" load bearing studs with 5/8" gyp both sides (one layer), which even with sound batts only provides rating of 40-41 according to USG website. Closest I can find to the desired wall thickness (which is 7 1/4") is a UL for a non-loadbearing wall which uses resilient channels (UL 419). Can you use this UL for a load-bearing wall, as well? Is there an alternative way to achieve a 50 rating by using a wall that is only 7 1/4"? Can you boost the rating from 41 to 50 without changing the thickness of the wall or the 6" stud (stud size cannot change)? How are others achieving this STC rating in load bearing steel stud R-2 buildings?
 
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