Although closed-cell Versi-Foam® Systems are not technically an acoustical material (meaning they do not absorb sound), they can be used in the effort to control sound. As a closed cell foam, it will block the transmission of sound from one area to another. Therefore, spraying a layer of foam on an interior wall will muffle sound around loud rooms and maintain privacy in homes, offices, hospitals, schools, libraries, etc.
By spraying a layer of foam onto very hard surfaces, sound is reduced because the echo is reduced. For instance, a room with concrete walls and floors with a very loud piece of machinery can make for a very noisy situation. The sound of the equipment will keep bouncing off the concrete surfaces. Foam on the walls will reduce the echo, thus reduce the sound.
Because it is a closed cell, expanding sealant, by caulking large gaps between areas can stop the passage of sound, along with air, dirt, moisture, etc.