First Step Premium 3in1 Underlayment, 100 sq. ft. Roll is designed for use under floating laminate and engineered wood flooring. This product is meant for use on concrete slabs and wood subfloors that are on or above grade. This underlayment creates a pocket of constantly circulating air which inhibits mold growth. It is effective for sound reduction, moisture protection, comfort and even helps level minor subfloor corrections. First Step is ideal for use with radiant heated floors. In a compression test using 1,320 lbs. of pressure, Roberts First Step Underlayment retained 96 of its original thickness after seven days, compared to only 57 by a leading 2in1 foam product.
