Stc Ratings Concrete Wall Assemblies

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

Stc ratings concrete wall assemblies.

In the absence of test data standard calculation methods exist which tend to be conservative. 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. 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. A wide variety of stc ratings is available with concrete masonry construction depending on wall weight wall construction and finishes.

The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings. 1 contains procedures for determining stc values of. Standard method for determining sound transmission ratings for masonry walls tms 0302 ref. Stc 0 18w 40 where w pounds per square foot psf this information is provided as a tool to help estimate.

3 5 8 metal studs 5 8 gyp 2 layers total no insulation. The stc rating of a cmu wall can be estimated based on its weight using the following formula. Staggered or double stud walls are higher rated than single stud walls.