Just as it’s desirable to seal a house against infiltration by heat, cold and air pollution, it's often desirable to seal noise out, as well. In fact, sound often follows the very same route air and energy does to seep in and out of a structure.
Sound transmits through small gaps in joints between drywall sheets and where components such as electrical outlets and switch boxes penetrate drywall. One measure to reduce noise infiltration is to use acoustic sealant around the perimeter of drywall sheets in new construction before tape and drywall joint compound are applied.
Although acoustic sealant applies and appears similar to standard caulk, it maintains a tacky flexibility for decades, preserving its superior noise-dampening properties.