Sound Insulation Definition: The ratio of the incident sound power W1 on the tested item to the transmitted sound power W1 through the item, multiplied by the logarithm base 10. This quantity is represented by R, i.e., the formula

The results of sound insulation typically include the apparent sound insulation, normalized sound pressure level difference, and standardized sound pressure level difference. The normalized sound pressure level difference is corrected using the reference absorption amount within the receiving room, while the standardized sound pressure level difference is corrected using the reference reverberation time within the receiving room.

Sound insulation measurements are typically categorized into laboratory and on-site testing. The building components commonly measured include walls, floors, doors, windows, exterior wall elements, and the entire building envelope.

The lateral transmission of sound in the testing facilities used in our laboratory measurements is suppressed. The results obtained can be used to design building components with excellent sound insulation properties, to compare the sound insulation performance of building components, and to classify them based on their sound insulation performance. Below is a portion of the sound insulation measurements we conducted in our laboratory.