I know someone who tried to insulate a wall for sound with "Great Stuff." Turns out that once it hardens, it makes an excellent conductor of sound. He was *not* happy with the results. It also expands with a great deal of force. When he sold the place, we ended up having to redo the drywall on that wall because the great stuff had pushed it out a couple of inches at the bottom.
In my experience, expanding foam is not the stuff to use for either sound insulation or in fully enclosed spaces.
QBFreak t1_j6hg0ch wrote
Reply to Hollow core door question by trash_recycle
I know someone who tried to insulate a wall for sound with "Great Stuff." Turns out that once it hardens, it makes an excellent conductor of sound. He was *not* happy with the results. It also expands with a great deal of force. When he sold the place, we ended up having to redo the drywall on that wall because the great stuff had pushed it out a couple of inches at the bottom.
In my experience, expanding foam is not the stuff to use for either sound insulation or in fully enclosed spaces.