What does Sound Transmission Class (STC) measure in building construction?

Sound Transmission Class (STC) specifically measures the effectiveness of a partition, such as walls, floors, or ceilings, in reducing the transmission of airborne sound. This metric is vital in building construction and design as it directly relates to the acoustical comfort of a space. A higher STC rating indicates better sound isolation capabilities, meaning that less sound is transmitted through the partition, providing peaceful environments in homes, offices, and other facilities where noise control is a priority.

Measuring STC involves assessing how well a partition can dampen sound across a range of frequencies, which is essential for creating spaces where privacy and noise control are important considerations. This is particularly relevant in multifamily housing, conference rooms, and other areas where people require quiet.

The other choices do not relate to STC. Energy efficiency of materials, heat resistance, and structural integrity, while important aspects of building science, are not measured by STC and pertain to different aspects of building performance.