Which term refers to the lightweight fiberglass insulation used to control noise within interior partitions?

• A. Mass-loaded Vinyl
• B. IIC
• C. Sound batting
• D. Sound Absorption

Answer: (C)

Sound batting is the term for lightweight fiberglass insulation installed in wall and partition cavities to control noise between rooms. It works by filling the space with a porous material that absorbs sound energy and dampens vibrations, improving the partition’s ability to block airborne noise without adding the heavy mass of a barrier. This distinguishes it from mass-loaded vinyl, which is a dense sound-blocking barrier, and from IIC, which is a rating for impact sound performance, not a material. It also differs from sound absorption in general, which focuses on reducing reverberation inside a room rather than enhancing sound isolation through the cavity.