Ceiling sound transmission class | Article about ceiling sound transmission class by The Free Dictionary
ceiling sound transmission class
ceiling sound transmission class, ceiling STC
A single-number rating of the sound-insulating value of a suspended ceiling between adjacent rooms.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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It was formerly called Ceiling Sound Transmission Class
(CSTC), but was changed to avoid confusion with the STC rating.