sound transmission class (STC)

Sound Transmission Class (STC) is a rating that measures how well a building material or partition blocks sound from passing through it. A higher STC rating indicates better sound insulation, meaning the partition reduces noise transmission more effectively. For example, an STC of 50 can significantly diminish loud speech, while an STC of 35 might only lessen background noise. This rating helps architects and builders select appropriate materials to ensure privacy and acoustic comfort in spaces like apartments, offices, and recording studios. It provides a standardized way to compare the soundproofing capabilities of different walls and barriers.