by Jon Eakes We rarely think about adding soundproofing during renovation projects. But small extras that improve the sound control in a building make good sense and should appeal to many customers. While total soundproofing is too costly in a retrofit, small steps can have a noticeable effect. Good sound control begins with careful construction practices. Walls properly designed for sound control often do not perform well simply because of poor workmanship. Inversely, ordinary walls can perform surprisingly well with just a little attention to detail. Add a few simple extras, and both quiet and noisy rooms will be kept to themselves while your reputation as a contractor will spread. Flanking Paths The major offenders in sound transmission from one