Skip to main content

Whisper Step®

Whisper Step® acoustical underlayment features unmatched, high-density support under luxury vinyl flooring. Whisper Step® provides a significant reduction in impact noise and can be used over most substrates.


  • MLF/LVT/Rigid Core with attached back
  • Laminate
  • Sheet Vinyl
  • Engineered hardwood
  • Solid hardwood


  • Noise Guard
    Reduces impact and airborne noise in-room and between floors. Reduces up to 10 decibels of in-room noise and an overall improvement between floors of 25%.
  • Block-out® Moisture Guard
    Prevents spills from getting into subfloor and allows moisture vapor to escape from beneath.
  • Mold & Mildew Guard
    Fresh Dimension® antimicrobial works to inhibit the growth of mold, mildew, and odor-causing bacteria.
  • Comfort
    Makes hard-surface flooring more enjoyable.
  • Support
    The class leading extreme density not only resists compression but will perform for the life of the floor.
  • Easy Installation
    Lays flat and helps mask minor subfloor irregularities; can be used above and below grade.


Composition:Made of High-Density Synthetic Rubber
Density:62 lbs/ft³ or 42 oz/yd²
Shore A Hardness:70 ASTM D2240
IFD @ 25%/65%:677.2 lbs/5,000+ lbs
Thickness:0.056" (1.42 mm)
Moisture Barrier:Block-Out® Moisture Guard
Permeance:1.151 ASTM E96 *
Water Vapor Emission:0.252 lbs/1000 ft2/24 hr ASTM E96
Castor Durability Test:Passes 25,000 Cycles**
Product Codes:
36" x 33.33'54" x 44.44'
Roll Weight:
29 lbs58 lbs

Acoustical Properties

Impact Insulation Class (IIC):73 ASTM E492 / E989
ΔIIC:22 ASTM E2179
Sound Transmission Class (STC):64 ASTM E90 / E413


Indoor Air Quality:Passes California Section 01350 for low VOC emissions
  • * Conduct moisture tests in accordance with flooring manufacturer installation guidelines and requirements
  • ** Passes Castor Durability Test for 25,000 cycles when tested under minimum of 3 mm double-glued luxury vinyl plank and minimum 3.2 mm floating-click
  • Shore A Hardness: ASTM D2240
  • IFD: ASTM D3574
  • Permeance: ASTM E96
  • IIC: ASTM E492-09 / ASTM E989-06
  • Δ IIC: ASTM E2179-03
  • STC: ASTM E90 / ASTM E413-10

Product Downloads