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.

Stc rating for concrete walls.

These tests have indicated a direct relationship between wall weight and the resulting stc heavier concrete masonry walls have higher stc ratings. Fire resistance ratings with multi layer designs ul u415 oscillation tested to 1 million cycles to ensure structural performance. The standard requires a minimum laboratory stc rating of 50 for party walls and floor ceilings. In general the stl of a concrete masonry wall increases with increasing frequency of the sound.

1 contains procedures for determining stc values of concrete masonry walls. Usg provides resources here for our ul wall assemblies for seamless integration into any construction project. 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. Mass is commonly added to existing walls by adding additional layers of gypsum.

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. Sound transmission class guidance introduction the noise guidebook. According to the standard stc can be determined by field or laboratory testing in accordance with standard test methods or by calculation. 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.

Many sound transmission loss tests have been per formed on various concrete masonry walls. One has an stc 47 4 solid concrete the other an stc 48 steel stud wall. Insulation will noticeably improve the stc rating of an assembly. Staggered or double stud walls are higher rated than single stud walls.

When the mass of a barrier is doubled the isolation quality or stc rating increases by approximately 5 db which is clearly noticeable. These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies. We see two walls. Adding additional layers of drywall can improve the stc rating of an assembly.

For example a thick concrete wall will block more sound than a thin gypsum 2x4 wall. Metal stud walls perform better than wood stud walls. Standard method for determining sound transmission ratings for masonry walls tms 0302 ref.