The cost of the material depends on where you live and if you plan to install it or have the pros.
Open cell spray foam insulation soundproofing.
There are several types of insulation foam that you may use to create a thicker barrier between rooms and floors to reduce noise but know that sound deadening is not the main goal when it comes to using this type of foam.
However in real construction a batt would be cut to fit around utilities and boxes leaving sound transfer cracks.
It ties with rock wool batts for an stc of 50 in a laboratory test environment.
Is less expensive than closed cell.
Spray foam insulation cost open cell polyurethane spray foam.
It is also less temperature sensitive than the open cell spray.
However i prefer a 1 inch thick square foot price.
Some places give the cost per board foot and others by square foot at r 1.
Foam it green 1202 class 1 open cell spray foam kit is a diy product that allows you to add acoustic value to any wall ceiling or floor.
However to help you find.
The sound blocking ability can be compromised over time.
For damping the resonance in the air cavity we prefer medium density fiberglass cellulose cotton mineral fiber or polyester.
All of these are open and airy enough to adequately interact with the sound waves in the sealed wall or ceiling cavity.
The kit produces an excellent thermal barrier plus an air moisture and sound barrier.
Why open cell oc spray foam is best for sound attenuation.