What is the term for a building element's resistance to the passage of sound?

The term for a building element's resistance to the passage of sound is indeed referred to as the STC Value, which stands for Sound Transmission Class. This rating measures the effectiveness of a material or assembly in reducing sound transmission, helping to determine how well it can isolate sound between spaces. The higher the STC value, the greater the sound insulation capability of the building element, which is particularly important in residential and commercial construction for ensuring privacy and comfort.

Other options like SI Rating and AC Rating do not pertain to sound resistance. The R Value is specifically related to thermal resistance and insulation properties, indicating how well a building element resists heat transfer, rather than sound. Understanding STC values is crucial for builders and architects as they design spaces meant to minimize sound travel and enhance occupant comfort.