Stc Ratings For Concrete Floor Assemblies

Determining sound transmission class stc for concrete masonry.

Stc ratings for concrete floor assemblies. In 1961 stc was introduced as the method for comparing various wall ceiling floor door and window assemblies. First up if the original architectural drawings are accessible it may be possible to look up the design assembly and postulate the intended stc rating by comparing that data to existing lab test data. While this is a good. The estimated ratings are based on laboratory test results from various compendiums of stc ratings.

Sound transmission class stc provides an estimate of the acoustic performance of a wall in certain common airborne sound insulation applications the stc of a wall is determined by comparing sound transmission loss stl values at various frequencies to a standard contour stl is the decrease or attenuation in sound energy in db. Stc ratings for wall floor and window materials and assemblies 3 appendix a stc ratings a 1 walls a 1 exterior a 1 interior a 9 wooden studs a 9 metal studs a 14 floors a 16 wood a 16 concrete a 21 windows a 24 doors a 27 exterior a 27 interior a 29 appendix b references b 1. It is recommended to consult a professional acoustician for more detailed information or to analyze the specifics of your project assembly. In order to properly ascertain the stc rating of a wall or other assembly there are two approaches lab comparisons.

To view different wall assemblies click on each point below that may apply to your project. This is usu ally because there is a pronounced dip in the test curve and the stc rating is heavily influenced by a measurement in one fre quency band.