Stc Ratings Concrete Wall Assemblies

3 5 8 metal studs 5 8 gyp 2 layers total no insulation.

Stc ratings concrete wall assemblies.

Stc is highly dependant on the construction of the partition. 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. 3 5 8 metal studs 5 8 gyp 2 layers total batt insulation. Staggered or double stud walls are higher rated than single stud walls.

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. 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. 1 contains procedures for determining stc values of. 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. Standard method for determining sound transmission ratings for masonry walls tms 0302 ref. The stc rating of a cmu wall can be estimated based on its weight using the following formula.