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Floor Muffler® Ultraseal

floorMuffler® 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.

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How it works

Underlayment is the layer of your flooring system between the subfloor and surface covering. The primary role of underlayment is to provide a flat, smooth surface for the floor covering. In addition, underlayments are critical for supporting your floor’s locking system while helping remedy imperfections in your subfloor, like minor degrees of leveling and small cracks.

High-performance underlayments like floorMuffler® UltraSeal HD significantly improve your entire flooring system, by providing increased thermal properties, enhanced acoustic performance and protection from potentially harmful water vapor that can lead to mold and mildew.

FloorMuffler® UltraSeal HD delivers increased cost savings over the life of your flooring system by providing many more benefits than most economical, standard foam underlayments. Most reputable floor-covering manufacturers require clients to install a high-performance underlayment like floorMuffler® UltraSeal HD with their products to honor their warranties.

Product specs

Standard Size Contractor Size
Material XLPP Foam XLPP Foam
Thickness 2 mm 2 mm
Width 39 in 72 in
Length 30.75 ft 100 ft
Coverage 100 sf 600 sf


  • Residential
  • Commercial

Installation methods

  • Floating

    An installation method that can be used with a variety of materials, including laminates, engineered hardwood, luxury vinyl and rigid core flooring. In this method, individual planks (or in some cases tiles) interlock edge-to-edge to form a single mat-like surface that simply rests on the underlayment.

  • Nail Down
    Nail Down

    Nail installation is a method commonly used for solid hardwood floors. This method uses a flooring cleat to nail down the flooring to the wood subfloor.

  • Double Glue Down
    Double Glue Down

    An installation method whereby the underlayment is first adhered to the subfloor with an adhesive, and the floor is then adhered to the underlayment. When using this method, it is very important to make sure that the right adhesives are used depending on the type of flooring, subfloor and underlayment in the installation.

Product variations

Floor Muffler Ultra Seal product Original Floor Muffler Underlayment Ultra Seal

Product Overview

  • Acoustic Performance

    • Outstanding through the floor and impact noise protection.
    • Exceeds requirements for Uniform Building Codes.

    IIC: 74

    STC: 73

    ΔIIC: 25

  • Moisture Protection

    • Closed-Cell XLPP Core creates a Moisture Barrier.
    • No additional films required.
    • Exceeds industry standards.
  • Floor Comfort

    • Improves the R-Value of your flooring system.
    • Suitable for use with radiant heat flooring.
    • Helps provide a comfortable walking surface.
  • Floor Strength & Durability

    • Outstanding compression strength to protect the locking systems of your floor.
    • Helps eliminate minor subfloor imperfections.
  • Environmentally Friendly

    • VOCs below quantifiable limit as per CA 01350.
    • Mold and mildew resistant.
  • Easy to Install

    • Light weight.
    • UltraSeal system allows for easier installation.
    • No need for professional tools.