First Step Premium 3-in-1 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 sub-floor 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 2-in-1 foam product.
40 in. x 30 ft., provides 100 sq. ft. of protection
Constant air movement inhibits mold growth
Seals out moisture to protect flooring
Includes adhesive strip and 4 in. overlap film for linking multiple rolls
STC rating of 67 and Impact Sound Transmission Test (IIC) rating of 68, R-Value .39
Sound Transmission Lost Test (STC) rating of 67 and Impact Sound Transmission Test (IIC) rating of 68, R-Value .39