A versatile mat underlayment when setting tile and stone over concrete, plywood, primed OSB or another acceptable subfloor, EasyMat Tile & Stone Underlayment from Custom Building Products is up to 25 times lighter than 1/4" (6 mm) backerboard, cuts easily with a utility knife, doesn’t require any nails or screws, and comes in a peel-and-stick version. It also features SoundGard Technology to provide high and credible impact sound reduction.