Effects of structural flanking on apparent STC of steel stud wall
Keywords:Acoustic noise, Real time systems, Steel structures, Sound pressure levels, Steel stud wall, Structural flanking
AbstractThe results of the sound transmission class (STC) 50 tests are described and the effects of flanking transmission on the test results are discussed. The issuance of an occupancy permit often depends on achieving STC of demising walls within both newly-constructed and converted condominium buildings. The demising wall which separated the bathroom and entry/kitchen area of the test suite from the corridor was constructed. The Apparent STC test was carried out in accordance with ASTM E 336-05 to the extent possible given the small size of both the source (corridor) and receiving (bathroom) spaces. A powerful loudspeaker fed with stead broad-band noise was placed in the corridor and average sound pressure levels were measured with a Larson-Davi Model LD2800 Real Time Analyzer. The initial test of the corridor wall yielded at Apparent STC (ASTC) of 46, whereas the 2006 BC Building Code rates this construction at STC 57 to 59.
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