A friend of mine lives in a condo and has a son that likes his music loud. Yesterday I was asked a good way to sound proof part of a basement so as to not disturb neighbors in an attached condo. She already bought a sound proofing pad to put on the overhead. I was wondering if fiberglass insulation between joists would help. What's your opinion/ recommendations? The space in approximately 12x12 foot.
Thanks in advance.