Help! Sound Transmission Classification
Las Vegas has various noise reduction areas, in which construction needs to limit the amount of outside noise entering a house. Mostly this is documented via Sound Transmission Classification (STC) requirements for the various components. Doors and Windows are easy, because the documentation is available from the mfg. The tricky one is wall STC. We have sprayed concrete walls varying from 3-4″ with 4″ of polyurethane foam. Any idea how to find the STC for this assembly? I’ve googled till my fingers bled, with no luck.