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Q.I'm renovating a downstairs apartment in an older four-unit building and have been asked to make the apartment quieter. The floors in the second-story apartments are newly carpeted, so any soundproofing measures would need to be limited to the first-floor apartment's ceiling. I've recommended screwing resilient channel over the existing plaster-and-lath ceilings and installing new drywall, but are there other steps that I should consider?A.Bonnie Schnitta, an acoustic consultant at SoundSense in East Hampton, N.Y., responds: Resilient channel will add flexibility to the ceiling assembly, which is needed to deal with foot traffic and other types of structure-borne noise. But when you fasten the drywall to the metal channels, be sure...

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