Sound transmission class guidance introduction the noise guidebook pages 33 37 provides an elementary discussion of stc provides some stc ratings for common building materials and limited exterior and interior wall construction configurations and describes a method to determine composite stc value of a wall containing a window or door.
Stc of concrete block wall.
Both oitc and stc indicate a wall s ability to block the transmission of sound from one side of the wall to the other.
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.
8 concrete block wall painted with 1 2 drywall on independent steel stud walls each side.
I would strongly recommend you hire a licensed and insured concrete block wall contractor to perform the installation for you.
Many sound transmission loss tests have been per formed on various concrete masonry walls.
Stc 0 18w 40 where w pounds per square foot psf this information is provided as a tool to help estimate.
Concrete masonry walls do not burn.
The estimated ratings are based on laboratory test results from various compendiums of stc ratings.
Additionally concrete masonry walls pass the hose stream test unlike other fire rated wall systems.
Determining sound transmission class stc for concrete masonry.
In general the stl of a concrete masonry wall increases with increasing frequency of the sound.
Cost can add up quickly especially if you re a novice and have never attempted a concrete block wall installation before.
Concrete block wall total average cost per square foot.
In the us it is widely used to rate interior partitions ceilings floors doors windows and exterior wall configurations.
Others include the sound transmission class stc and the noise reduction coefficient nrc.
It is recommended to consult a professional acoustician for more detailed information or to analyze the specifics of your project assembly.
Sound transmission class or stc is an integer rating of how well a building partition attenuates airborne sound.
The stc rating of a cmu wall can be estimated based on its weight using the following formula.
To view different wall assemblies click on each point below that may apply to your project.