The acoustic performance of glazing assemblies is expressed in two terms:
Sound Transmission Class (STC) is used to measure the sound transmission loss of interior walls, ceilings and floors.
Outdoor-Indoor Transmission Class (OITC) measures the sound transmission loss of exterior glazing applications.
High sound transmission loss—good sound insulation—is desired in many commercial curtain wall applications . Limiting sound transmission through glazing requires review and testing of the entire glazing system.
For more information, refer to the
For more information refer to local approved standards – ABNT (Associação Brasileira de Normas Técnicas) and GANA.