Whisper Step®

Whisper Step® luxury vinyl 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.


  • Luxury vinyl tile/plank
  • Rigid composite
  • WPC

Also for use under

  • Laminate
  • Engineered wood
  • Solid hardwood


  • Provides significant reduction to impact noise in the room and floor below
  • Retains acoustic properties over time
  • Guaranteed not to break down or bottom out for the life of the floor
  • For use over in-floor heating and is recommended by the Radiant Professionals Alliance as an excellent choice
  • Can be used over most substrates – on, above, or below grade
  • Fresh Dimension® antimicrobial inhibits the growth of mold, mildew, and odor-causing bacteria


Thickness:0.056" (1.42 mm)
Density:62 lbs/ft³ or 42 oz/yd²
Shore A Hardness:70 ASTM D2240
IFD @ 25%/65%:677.2 lbs/5,000+ lbs
Product Codes:
Composition:Made of High-Density Synthetic Rubber
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**
36" x 33.33'54" x 44'
Roll Weight:
29 lbs58 lbs
ΔIIC:22 ASTM E2179
Sound Transmission Class (STC):63*** ASTM E90 / E413
Impact Insulation Class (IIC):66*** ASTM E492 / E989
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
  • *** When tested with floor-ceiling assembly (6” concrete slab)
  • 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