Stc Rating For Concrete Walls

Insulation will noticeably improve the stc rating of an assembly.

Stc rating for concrete walls.

These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies. The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings. Adding additional layers of drywall can improve the stc rating of an assembly. Mass is commonly added to existing walls by adding additional layers of gypsum.

These tests have indicated a direct relationship between wall weight and the resulting stc heavier concrete masonry walls have higher stc ratings. Resilient channel can improve the stc rating of an assembly. In general the stl of a concrete masonry wall increases with increasing frequency of the sound. Many sound transmission loss tests have been per formed on various concrete masonry walls.

Sound transmission class or stc is an integer rating of how well a building partition attenuates airborne sound in the us it is widely used to rate interior partitions ceilings floors doors windows and exterior wall configurations. Metal stud walls perform better than wood stud walls. One has an stc 47 4 solid concrete the other an stc 48 steel stud wall. 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.

1 contains procedures for determining stc values of concrete masonry walls. Standard method for determining sound transmission ratings for masonry walls tms 0302 ref. According to the standard stc can be determined by field or laboratory testing in accordance with standard test methods or by calculation. For example a thick concrete wall will block more sound than a thin gypsum 2x4 wall.

We see two walls. Fire resistance ratings with multi layer designs ul u415 oscillation tested to 1 million cycles to ensure structural performance. 5 or 6 points in laboratory stc ratings for essentially similar assemblies. Staggered or double stud walls are higher rated than single stud walls.

Usg provides resources here for our ul wall assemblies for seamless integration into any construction project. Note that in the low frequency range important for music theaters traffic aircraft and most other real world noise sources the lower stc wall is literally 30 decibels better yet lower stc. When the mass of a barrier is doubled the isolation quality or stc rating increases by approximately 5 db which is clearly noticeable.