Stc Ratings Concrete Wall 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.

Stc ratings concrete wall assemblies.

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. 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 no insulation.

Stc 0 18w 40 where w pounds per square foot psf this information is provided as a tool to help estimate. 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. 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. 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. The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings.