Place, click & grout - It's so easy. The non-skid base is self-leveling, sound deadening, and allows this tile to be conveniently installed over existing hard surfaces. The tray serves as a built-in underlayment which makes the install quick and painless. The interlocking tabs provide precise spacing — effortlessly. And unlike traditional tile installations, this tile is not adhered to the subfloor, so it responds better to structural movement. Some collections and installations may require a foam underlayment, as your professional about the options.