I filled my hollow wood door with spray foam insulation, hoping to reduce noise coming through the door and make the door a better sound insulator.

Test Result: Noise reduced from ~40 decibels to ~37 decibels and the sounds seem more muffled. I think it was worth the work and spray foam door insulation is a cheap alternative to getting a solid wood door.

* Do this at your own risk * (This video is a demonstration only, not a recommendation)

#sprayfoam
#insulation
#doors