Stc Ratings Concrete Wall Assemblies

A wide variety of stc ratings is available with concrete masonry construction depending on wall weight wall construction and finishes.

Stc ratings concrete wall assemblies.

In general a higher stc rating blocks more noise from transmitting through a partition. 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. 1 contains procedures for determining stc values of.

Staggered or double stud walls are higher rated than single stud walls. The stc rating of a cmu wall can be estimated based on its weight using the following formula. Stc 0 18w 40 where w pounds per square foot psf this information is provided as a tool to help estimate. 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.

In the absence of test data standard calculation methods exist which tend to be conservative. 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 is highly dependant on the construction of the partition.