Addressing Sound Transmission in Residence (HSW)
Ever since the beginning of multi-family dwellings, sound isolation between residential units has generated significant tension. Residents want privacy from the people living next to them, even though they may be less than a few feet away from one another. According to the International Building Code, partitions and constructions between residences should have a minimum Sound Transmission Class (STC) of 50 and a minimum Impact Insulation Class (IIC) of 50 (45 if field measured). This language has been adopted by many state building codes including New Hampshire and Massachusetts.