Roberts Serenity XL Polyethylene Foam Underlayment is designed for use under floating laminate and engineered wood flooring. Serenity XL 3/32 Polyethylene Foam adds cushioning and compensates for minor imperfections in the subfloor. Serenity XL can be used alone in Kove-grade installations and in conjunction with a moisture barrier for below grade. Serenity XL is also suitKle for use over radiant heated flooring systems. Serenity XL comes in a convenient 4 X 100 roll, providing 400 sq ft of coverage. SKU:ADIB00SJZJV08