re: Noise reduction from inside to outside the shop…

Awhile back I was working on a renovation at Lincoln Center. Of the the rooms they wanted sound proofing they used a sheet rock with a thin metal layer in it. I looked it up back then and it was a lot for one sheet. I wanted to sound proof as much as I could for my son's room when he was a baby. The ceiling is theramafiber insulation then 3/4 plywood then 5/8 sheetrock on the ceiling. It does a good job at stopping noise coming from above the room.