Ted Cushman

We get a lot of calls from customers in recently built Boston condos who are hearing too much noise from the unit next door. There are rules now in the building code about soundproofing in condominiums and apartment buildings, but the code doesn’t tell you how to build an assembly, it just tells you the rating you have to achieve.

Party walls, floors, and ceilings are rated according to a “Sound Transmission Class,” or “STC,” that indicates how well they impede the passage of sound. The higher the STC, the better the element performs (that is, the less sound is transmitted). By code, walls between multifamily dwelling units should have an STC of 50 (if measured in the...

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