Sound proofing with Insulation
I am remodeling the first floor of my 2 family home and have a tenant living upstairs. I want to sound proof the ceiling of the first floor apartment . I’ve been told that open-cell spray foam insulation is very good for soundproofing. Would using open-cell spray foam be a significant improvement over batt insulation? Also, what thickness of each kind of insulation would be best if the space to be filled is 8 inches deep?