The heart of the SnapStone system is a patent-pending interlocking plastic tray with a non-skid, sound-deadening grid. This grid eliminates the need for messy thinset, and allows real porcelain tile to be installed directly over hard, flat surfaces such as vinyl, concrete and hardwood floors. The system makes perfect alignment easy, allowing anyone from contractors to do-it-yourself homeowners to achieve professional results in a fraction of the time it takes using traditional methods!