Hey, I have an apartment which I would like to reduce the amount of sound coming in from my neighbors.... I'd prefer not to remove the existing sheetrock or put another layer of sound proofing material over the existing sheet rock. Instead, I prefer to go with blowing cellulose into the...

Soundproofing Air Return Plenum. I have 2 air return plenums in my basement and they echo and vibrate something aweful. What can i do to sound proof them or at least stop the echo/vibration. I'll be decoupling the ceiling so that'll help but still. Also, they're nailed flush to the joists...

Greetings I have a couple of questions that I just can't seem to find definite answers to so i thought i'd ask you guys. 1. Does anyone know the STC rating of a typical lowes 6inch hollow glass block window? 2. How would i go about sound proofing that as i am covering it up with my wall. 3...