Stc Ratings Concrete Wall Assemblies

In the absence of test data standard calculation methods exist which tend to be conservative.

Stc ratings concrete wall assemblies. 1 contains procedures for determining stc values of. 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 no insulation.

A wide variety of stc ratings is available with concrete masonry construction depending on wall weight wall construction and finishes. 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. Staggered or double stud walls are higher rated than single stud walls.

In general a higher stc rating blocks more noise from transmitting through a partition. The stc rating of a cmu wall can be estimated based on its weight using the following formula. 3 5 8 metal studs 5 8 gyp 2 layers total batt insulation.