Stc Ratings For Concrete Floor Assemblies

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 concrete floor assemblies.

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. The estimated ratings are based on laboratory test results from various compendiums of stc ratings. In order to properly ascertain the stc rating of a wall or other assembly there are two approaches lab comparisons. While this is a good.

5 or 6 points in laboratory stc ratings for essentially similar assemblies. 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. The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings.

To view different wall assemblies click on each point below that may apply to your project. In 1961 stc was introduced as the method for comparing various wall ceiling floor door and window assemblies.