Unison 2-in-1 Underlayment for laminate and engineered wood flooring is designed with 3/32 in. polyethylene foam for cushioning and a 2 mil thick top film to protect floors from harmful moisture vapor. Designed for on- or above-grade applications, as well as below grade when used with a moisture barrier. It's easy to install with a plastic overlap and adhesive strip to join multiple rolls. Unison's foam construction also reduces everyday surface noise.