Stc Of Concrete Block Wall

Sound transmission class or stc is an integer rating of how well a building partition attenuates airborne sound.

Stc of concrete block wall.

8 concrete block wall painted with 1 2 drywall on independent steel stud walls each side. In the us it is widely used to rate interior partitions ceilings floors doors windows and exterior wall configurations. These tests have indicated a direct relationship between wall weight and the resulting stc heavier concrete masonry walls have higher stc ratings. Concrete masonry walls do not burn.

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. The estimated ratings are based on laboratory test results from various compendiums of stc ratings. 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.

Cost can add up quickly especially if you re a novice and have never attempted a concrete block wall installation before. Additionally concrete masonry walls pass the hose stream test unlike other fire rated wall systems. The estimate could easily be off by as much as 4 db. Determining sound transmission class stc for concrete masonry.

It is recommended to consult a professional acoustician for more detailed information or to analyze the specifics of your project assembly. Oitc differs from the stc rating in that the oitc was developed specifically to indicate transmission of noise from transportation. In general the stl of a concrete masonry wall increases with increasing frequency of the 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. Depending on the thickness of the wall the density of the units and the amount of grout used concrete masonry walls can provide up to a four hour fire rating. Concrete block wall total average cost per square foot. 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.