Sound transmission class stc is an integer rating of how well a building partition attenuates airborne sound in the usa it is widely used to rate interior partitions ceilings and floors doors windows and exterior wall configurations see astm international classification e413 and e90.
Flooring sound test.
The main test done by flooring industry is the impact insulation class iic ad sound transmission class stc.
It is important to understand that iic and stc tests are not for individual components of a flooring assembly but for the whole floor ceiling structure from the surface of the floor covering material in the upper unit all the way to the ceiling in the unit below.
Sound absorption of floor coverings may be measured on two of those scales.
The results of the test are rated in terms of the impact insulation class iic.
The higher the number the better the sound isolation.
Iic impact insulation class iic measures a floor ceiling assembly s resistance to the transmission of structure borne or impact noise.
The data and assemblies shown are for informational purposes only and are not represented as being all inclusive correct complete or up to date.
It all begins with how sound is generated and the medium it transfers through.
When evaluating flooring underlayment sound deadening and acoustical ratings are one of the things homeowners or hoa considers.
The third covers room to room transmission more appropriate for walls.
Iic and stc tests are conducted in sound test laboratories.