Other informa wood stud walls.
Stc 50 cmu wall.
Area separation wall systems area separation wall submittal sheet sa925 wb2129 sheetrock shaft wall systems tested systems achieve up to 58 stc.
Many sound transmission loss tests have been per formed on various concrete masonry walls.
5 8 gypsum board type x 1 layer one side 2 layers on the other side.
These tests have indicated a direct relationship between wall weight and the resulting stc heavier concrete masonry walls have higher stc ratings.
One has an stc 47 4 solid concrete the other an stc 48 steel stud wall.
3 5 8 steel studs 25 gauge spaced 16 on center.
Metal stud walls 1 4.
Sound transmission class stc provides an estimate of the acoustic performance of a wall in certain common airborne sound insulation applications the stc of a wall is determined by comparing sound transmission loss stl values at various frequencies to a standard contour stl is the decrease or attenuation in sound energy in db.
The estimate could easily be off by as much as 4 db.
3 thick rockwool afb semi rigid batt insulation.
Staggered or double stud walls are higher rated than single stud walls.
The stc rating of a cmu wall can be estimated based on its weight using the following formula.
Metal stud walls perform better than wood stud walls.
In general the stl of a concrete masonry wall increases with increasing frequency of the sound.
Each assembly in the catalog is drawn 1 2.
Insulation will noticeably improve the stc rating of an assembly.
Stc 50 lab test 5 tl 93 333 alternative stc 50 wall options.
Studless walls tion in the example.
There are numerous other issues that need to be addressed to.
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.
Wood stud walls to a scale of one inch one foot and 1 3.
Weigh at least 50 less than masonry walls allowing faster easier installation for more information see the following brochures.
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.
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.
Stc 0 18w 40 where w pounds per square foot psf this information is provided as a tool to help estimate.
To view different wall assemblies click on each point below that may apply to your project.
