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. Stc is highly dependant on the construction of the partition. The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings. 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 general a higher stc rating blocks more noise from transmitting through a partition. 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. A wide variety of stc ratings is available with concrete masonry construction depending on wall weight wall construction and finishes.

3 5 8 metal studs 5 8 gyp 2 layers total batt insulation. 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.