Just to refine a point or two. We have the following elements to
help us isolate sound: - Staggered studs, double studs,
resilient clips&channel, and resilient channel are all common
methods to decouple walls and ceilings. - Some material in a
sealed air cavity (in our case) that increases the resistance to
sound wave movement, thereby robbing the waves of energy. A very
large volume of air can accomplish this, but our walls are
limited in depth. We add a low-medium density insulation to
increase the resistance without introducing conduction. This is
a thermodynamic process, whereby the introduction of open-fiber
insulation essentially mimics a system with a much bigger air
cavity. - This is primarily the job of materials like drywall
and plywood. Could be masonry if wer're looking at exterior
walls. Wall / ceiling framing and insulation technically
contribute to the overall mass of the partition as well as the
resonance and TL calculations, however we don't look to increase
the mass of either the framing or