Stc Ratings For Concrete Floor Assemblies

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Stc ratings for concrete floor assemblies.

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. In order to properly ascertain the stc rating of a wall or other assembly there are two approaches lab comparisons. Determining sound transmission class stc for concrete masonry. 5 or 6 points in laboratory stc ratings for essentially similar 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. It is recommended to consult a professional acoustician for more detailed information or to analyze the specifics of your project assembly. In 1961 stc was introduced as the method for comparing various wall ceiling floor door and window assemblies. The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings.

Stc is calculated by taking the transmission loss tl values tested at 16 standard frequencies over the range of 125 hz to 4000 hz and plotted on a graph. 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.