Re: Soundproofing a ceiling
Sound proofing is done by breaking the solid connection from one environment to another. Drywall attached to framing transmits the sound with ease. If you run metal lathe known as hat track perpendicular to the joists, you'll effectively break that connection. Drywall over the hat track and there should be a significant sound reduction. I'd also recommend using insulation as it will both keep the spaces more comfortable as well as help deaden the sound transmission.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!