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This report summarizes the available data on the airborne Introduction
sound transmission loss of woodframe construction Prediction of Airborne Sound Transmission Loss
unconnected doublerowofstud construction however the Unconnected Double Panels
1 other sections not shown
1/2-inch-thick gypsum board 2000 Frequency Hz 2x4 studs 5000 Frequency A-weighted sound level airborne sound transmission airspace angle of incidence approximate ASTM average sound transmission board screwed 12"o.c. C-lOc cavity sound absorption characteristic frequencies Connected Double covering the framework critical frequency data envelopes dB per octave DuPree estimate experimental data Figure D-l frequency range gypsum board screwed incident sound joists layer of 1/2-inch-thick light-frame construction mass per unit numerical integration one-half-octave-band One-third-octave TL data panel mass particleboard plywood predicting the sound prediction methods described reflection coefficient resilient channels screwed to studs Sharp single thin panel single-panel construction sound absorption material sound attenuation blanket sound level difference sound transmission coefficient sound transmission loss standard deviation standing wave STC rating intervals stud spacing theory and measurement thick sound attenuation TL(f transmission loss data type-X gypsum board unconnected double panels unit area wood-frame construction wood-frame interior partitions wood-joist floor-ceiling assemblies wood-stud