Stc Ratings Concrete Wall Assemblies

Stc is highly dependant on the construction of the partition.

Stc ratings concrete wall assemblies.

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. Staggered or double stud walls are higher rated than single stud walls. 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.

3 5 8 metal studs 5 8 gyp 2 layers total batt insulation. The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings. 1 contains procedures for determining stc values of. In general a higher stc rating blocks more noise from transmitting through a partition.

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