Roberts Underlayment and your laminate floor, the perfect Unison. In the growing market of laminate and engineered hardwood floating floors, the biggest concerns are noise/sound and water/mold damage. Roberts Unison 2-in-1 is engineered to meet the highest standards in sound reduction, moisture protection and comfort, and even minor sub-floor corrections. Easy to use rolls of 100 sqft, measuring 4' x 25' x 3/32". The polyethylene foam increases cushioning between flooring and sub floor. There is a 3" film overlap with adhesive strip for seamless protection. 2 mil thick top film protects from harmful moisture vapor.