149 results about "Sound transmission class" patented technology

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. Outside the US, the Sound Reduction Index (SRI) ISO index is used. The STC rating figure very roughly reflects the decibel reduction in noise that a partition can provide. To improve the sound transmission class and increase soundproofing two techniques are employed; sound isolation and sound absorption. Sound isolation entails blocking the path that sound can travel through by using cavity walls, adding resilient channels or using caulking to seal a room. Sound absorption entails adding extra mass to an already isolated partition, often using extra gypsum layers or by placing rockwool into cavities.