For walls separating sleeping units, what minimum sound transmission class must be achieved?

The minimum sound transmission class (STC) required for walls separating sleeping units is 50. This rating helps ensure adequate sound insulation, allowing occupants to enjoy a more peaceful and private environment. The STC rating quantifies how well a building element can attenuate sound, particularly in spaces where sleep or concentration is paramount, such as hotels, dormitories, and multi-family residential buildings.

An STC of 50 indicates a high level of sound attenuation, effectively reducing the transmission of noise between units. This is crucial for comfort and quality of life, as noise from adjacent spaces can disrupt sleep or privacy. Various construction methods and materials can be employed to achieve this rating, including the use of sound-dampening insulation, staggered stud walls, or specialized drywall products designed for better soundproofing.

While higher STC ratings, such as 60 or above, could potentially offer greater sound insulation, the code mandates a minimum of 50 to balance effective sound transmission reduction with practical construction and cost considerations.