Acoustic caulk is essentially a rubber-like material that doesn’t harden when used to create sound barriers. It’s a non-flammable sealant that’s usually latex-based, explicitly designed to reduce sound transmission. Furthermore, acoustic sealant acts as a vapor barrier as well.

Acoustic caulk, also known as an acoustic sealant, is a type of spray foam used and placed in ceilings, windows, and doors for soundproofing purposes (it has an acoustic rating). Furthermore, it is used to seal off any kinds of holes or gaps around pipes and electrical outlets, and so on.