Stc Ratings Concrete Wall Assemblies

Standard method for determining sound transmission ratings for masonry walls tms 0302 ref.

Stc ratings concrete wall assemblies.

Staggered or double stud walls are higher rated than single stud walls. 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. The sound transmission class stc is a single number rating of a material s or an assembly s ability to resist airborne sound transfer at the frequencies 125 4000 hz. 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.

3 5 8 metal studs 5 8 gyp 2 layers total batt insulation. Stc 0 18w 40 where w pounds per square foot psf this information is provided as a tool to help estimate. 3 5 8 metal studs 5 8 gyp 2 layers total no insulation. Stc is highly dependant on the construction of the partition.

The stc rating of a cmu wall can be estimated based on its weight using the following formula. A wide variety of stc ratings is available with concrete masonry construction depending on wall weight wall construction and finishes. In the absence of test data standard calculation methods exist which tend to be conservative.