FloorMuffler UltraSeal 600-sf, is a high performance Acoustic Underlayment & Moisture Barrier for use in residential and commercial flooring applications. As part of our Premium Collection, floorMuffler® is the ideal choice for most Laminate, Engineered and Solid hardwood flooring installations. floorMuffler® can be used in Floating, Nail down, and Double glue down installations. Available both with and without UItraSeaI self-sealing lip & tape system.