Stc Rating For Concrete Walls

Standard method for determining sound transmission ratings for masonry walls tms 0302 ref.

Stc rating for concrete walls.

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. 5 or 6 points in laboratory stc ratings for essentially similar assemblies. 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. Sound transmission class guidance introduction the noise guidebook.

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. 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. Fire resistance ratings with multi layer designs ul u415 oscillation tested to 1 million cycles to ensure structural performance. Adding additional layers of drywall can improve the stc rating of an assembly.

In general the stl of a concrete masonry wall increases with increasing frequency of the sound. Usg provides resources here for our ul wall assemblies for seamless integration into any construction project. Many sound transmission loss tests have been per formed on various concrete masonry walls. According to the standard stc can be determined by field or laboratory testing in accordance with standard test methods or by calculation.

Insulation will noticeably improve the stc rating of an assembly. Area separation wall systems area separation wall submittal sheet sa925 wb2129 sheetrock shaft wall systems tested systems achieve up to 58 stc have achieved up to 4 hr. Mass is commonly added to existing walls by adding additional layers of gypsum. For example a thick concrete wall will block more sound than a thin gypsum 2x4 wall.

Resilient channel can improve the stc rating of an assembly. These tests have indicated a direct relationship between wall weight and the resulting stc heavier concrete masonry walls have higher stc ratings. We see two walls. These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies.

One has an stc 47 4 solid concrete the other an stc 48 steel stud wall. Staggered or double stud walls are higher rated than single stud walls. The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings.