Installing Mass Loaded vinyl over existing drywall, while not ideal, may still provide significant soundproofing gains.
Installation Fixes with Mass Loaded Vinyl - Soundproof Direct
Mass Loaded Vinyl, or MLV, is a Vinyl-based sound membrane designed to add maximum soundproofing and dampening to your wall assembly. With STC 26, our
MLV Sound Barrier
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Technoflex Technowall Mass Loaded Vinyl 1 lb 4' x 25' x 1/8 Soundproofing Barrier Acoustic Wall 10048251 - The Home Depot
AcoustiClip Party Wall Soundproofing
How to Install Mass Loaded Vinyl for Soundproofing Walls
Top-ranked sound blocking technology with a proven 32 STC rating. Great for walls, floors, ceiling, doors, home theaters, automobiles, boats and RVs.
Soundsulate™ 2 lb Mass Loaded Vinyl MLV, Soundproofing Barrier 4' x 25' (100 sf) x 3 rolls